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Pyrolytic reduction roasting of used ternary lithium-ion battery cathode powder using coconut shell powder for selective recovery of lithium
No full textAbstract
Extensive attention is being devoted to the issues of environmental pollution and resource scarcity, which has prompted heightened interest in the recycling of spent lithium-ion batteries. In this paper, coconut shells, commonly considered as waste, were used as reducing agents for the recovery of valuable metals from spent lithium-ion battery powder (LiNi0.6Co0.2Mn0.2O2) though biomass-assisted pyrolysis, with the aim of alleviating lithium resource scarcity and addressing the environmental problems associated with the disposal of large quantities of spent batteries. During pyrolysis reduction process, the LiNi0.6Co0.2Mn0.2O2 (S-NCM) was first decomposed to dissociate into Li0.14Co0.86O, (NiO)0.75(MnO)0.25, Ni6MnO8 and Li2CO3, and then gradually reduced to Ni, Co and MnO. The reaction kinetics demonstrated that the apparent activation energies (Ea) ranged from 20 to 40 kJ∙mol−1, indicating that the reduction process was supervised by chemical reactions. To analyze the experimental outcomes and elucidate the mechanism of pyrolytic reduction, analytical techniques including TG-DTG-DSC, FT-IR, XRD, SEM, XPS, and TG-MS were utilized. Following pyrolytic reduction, the leaching efficiency of Li from the S-NCM through water leaching was 96.03 %. This method not only facilitates the effective recovery of lithium from the S-NCM without adding chemical reagents, but also enables the resourceful use of spent coconut shells, and addresses substantial environmental challenges. This study presents an efficient, cost-effective, and environmentally friendly process for the recovery of valuable components from the S-NCM.Abstract
Extensive attention is being devoted to the issues of environmental pollution and resource scarcity, which has prompted heightened interest in the recycling of spent lithium-ion batteries. In this paper, coconut shells, commonly considered as waste, were used as reducing agents for the recovery of valuable metals from spent lithium-ion battery powder (LiNi0.6Co0.2Mn0.2O2) though biomass-assisted pyrolysis, with the aim of alleviating lithium resource scarcity and addressing the environmental problems associated with the disposal of large quantities of spent batteries. During pyrolysis reduction process, the LiNi0.6Co0.2Mn0.2O2 (S-NCM) was first decomposed to dissociate into Li0.14Co0.86O, (NiO)0.75(MnO)0.25, Ni6MnO8 and Li2CO3, and then gradually reduced to Ni, Co and MnO. The reaction kinetics demonstrated that the apparent activation energies (Ea) ranged from 20 to 40 kJ∙mol−1, indicating that the reduction process was supervised by chemical reactions. To analyze the experimental outcomes and elucidate the mechanism of pyrolytic reduction, analytical techniques including TG-DTG-DSC, FT-IR, XRD, SEM, XPS, and TG-MS were utilized. Following pyrolytic reduction, the leaching efficiency of Li from the S-NCM through water leaching was 96.03 %. This method not only facilitates the effective recovery of lithium from the S-NCM without adding chemical reagents, but also enables the resourceful use of spent coconut shells, and addresses substantial environmental challenges. This study presents an efficient, cost-effective, and environmentally friendly process for the recovery of valuable components from the S-NCM
When Grand Societal Challenges Stimulate the Creation of Public Value: A Study of Nurses in a Non‐Western Public Healthcare Sector
No full textAbstract
This study aims to explore the extent to which grand societal challenges motivate street-level bureaucrats to actively create public value and why. The empirical sample comprises semi-structured interviews with 36 nurses working in four public hospitals in Egypt. Thematic analysis was subsequently applied to the transcripts from the semi-structured interviews to highlight the main themes linked to this topic. The findings show that the respondents (nurses in this case) have accepted the idea of creating public value through working extra unpaid hours, engaging actively in night shifts, and treating incoming refugees. This is a result of the following three categories of motives: Humanitarian (religious considerations, appreciation and praise from refugees, desire to emigrate), Job-related (greater sense of discretionary power, implementing the orientation or directions of the hospital administration, exploiting recent developments in medical instruments) and Patriotic motives (understanding that refugees are a source of foreign currency, creating a culturally diverse climate which Egypt lacks, ensuring partnership between hospitals and the private sector). This study contributes to emerging literature on grand societal challenges and the creation of public value by street-level bureaucrats on which empirical studies are rare, particularly in the context of developing nations.Abstract
This study aims to explore the extent to which grand societal challenges motivate street-level bureaucrats to actively create public value and why. The empirical sample comprises semi-structured interviews with 36 nurses working in four public hospitals in Egypt. Thematic analysis was subsequently applied to the transcripts from the semi-structured interviews to highlight the main themes linked to this topic. The findings show that the respondents (nurses in this case) have accepted the idea of creating public value through working extra unpaid hours, engaging actively in night shifts, and treating incoming refugees. This is a result of the following three categories of motives: Humanitarian (religious considerations, appreciation and praise from refugees, desire to emigrate), Job-related (greater sense of discretionary power, implementing the orientation or directions of the hospital administration, exploiting recent developments in medical instruments) and Patriotic motives (understanding that refugees are a source of foreign currency, creating a culturally diverse climate which Egypt lacks, ensuring partnership between hospitals and the private sector). This study contributes to emerging literature on grand societal challenges and the creation of public value by street-level bureaucrats on which empirical studies are rare, particularly in the context of developing nations
Effect of Subfreezing Relative Humidity Calculation Methods on Simulation Accuracy and Mold Risk in Cold Climates
No full textAbstract
Hygrothermal numerical simulations are essential for assessing the long-term performance of building structures under varying climatic conditions. However, discrepancies between simulated and measured relative humidity (RH) profiles, particularly at subzero temperatures, negatively impact the reliability and introduce uncertainty for practitioners in hygrothermal assessments. While both simulations and measurement sensors calculate RH similarly above freezing, referencing liquid water, differences emerge below freezing due to variations in calculation methods. Simulations typically account for ice formation at subzero temperatures, whereas measurements reference supercooled liquid water, causing RH values to diverge as temperatures decrease. This novel study investigated how RH calculation methods influence simulation accuracy in cold climates. Converting subfreezing RH values from the climate cabin to align with simulations improves agreement and validation accuracy. The results showed that the RH calculation method at subzero temperatures have a minimal impact on simulation end results or mold growth risk, allowing direct use of sensor data referenced to water. As temperatures decrease, the difference between RH values with respect to water and ice increases, making it advisable to use ice-referenced values in extremely cold conditions (<−30 ℃) for better accuracy.Abstract
Hygrothermal numerical simulations are essential for assessing the long-term performance of building structures under varying climatic conditions. However, discrepancies between simulated and measured relative humidity (RH) profiles, particularly at subzero temperatures, negatively impact the reliability and introduce uncertainty for practitioners in hygrothermal assessments. While both simulations and measurement sensors calculate RH similarly above freezing, referencing liquid water, differences emerge below freezing due to variations in calculation methods. Simulations typically account for ice formation at subzero temperatures, whereas measurements reference supercooled liquid water, causing RH values to diverge as temperatures decrease. This novel study investigated how RH calculation methods influence simulation accuracy in cold climates. Converting subfreezing RH values from the climate cabin to align with simulations improves agreement and validation accuracy. The results showed that the RH calculation method at subzero temperatures have a minimal impact on simulation end results or mold growth risk, allowing direct use of sensor data referenced to water. As temperatures decrease, the difference between RH values with respect to water and ice increases, making it advisable to use ice-referenced values in extremely cold conditions (<−30 ℃) for better accuracy
Characteristics and predictors of antipsychotic medication off-label use among community-dwelling older people
No full textAbstract
Background:
Concerns have been raised regarding the common off-label use of antipsychotic (AP) medications among older adults. However, comprehensive knowledge of the determinants of AP off-label use in this population remains limited.
Methods:
We examined characteristics and predictors of AP off-label use in a nationwide Finnish cohort of community-dwelling older adults with psychiatric morbidity—but without Alzheimer’s disease—using longitudinal register data on sociodemographic and illness-related factors. The sample comprised four groups: those prescribed APs off-label (n = 20,563), those with non-psychotic mental disorders without off-label APs (CG1, n = 22,891), those with psychosis or bipolar disorder with APs (CG2, n = 8,966), and those with psychosis or bipolar disorder without APs (CG3, n = 4,585). Sociodemographic and illness-related factors were compared between the off-label and the comparison groups using logistic regression.
Results:
Compared to comparison groups, individuals with off-label use more frequently had cardiovascular diseases and strokes. Compared to CG1 and CG3, individuals with AP off-label use were more often female, had a lower prevalence of asthma/chronic obstructive pulmonary disease, and a higher use of psychotropic medications and opioids. Compared to CG2, individuals with off-label use were more often male and had a lower prevalence of diabetes, epilepsy, as well as a lower use of psychotropic medications and a higher use of opioids. Risperidone (43%) and quetiapine (39%) were the most used APs off-label.
Conclusion:
Alternative treatments are needed to curb off-label AP use among community-dwelling older adults, given the high prevalence of cardiovascular disease and stroke. Monitoring guidelines are needed to promote safer prescribing practices.Abstract
Background:
Concerns have been raised regarding the common off-label use of antipsychotic (AP) medications among older adults. However, comprehensive knowledge of the determinants of AP off-label use in this population remains limited.
Methods:
We examined characteristics and predictors of AP off-label use in a nationwide Finnish cohort of community-dwelling older adults with psychiatric morbidity—but without Alzheimer’s disease—using longitudinal register data on sociodemographic and illness-related factors. The sample comprised four groups: those prescribed APs off-label (n = 20,563), those with non-psychotic mental disorders without off-label APs (CG1, n = 22,891), those with psychosis or bipolar disorder with APs (CG2, n = 8,966), and those with psychosis or bipolar disorder without APs (CG3, n = 4,585). Sociodemographic and illness-related factors were compared between the off-label and the comparison groups using logistic regression.
Results:
Compared to comparison groups, individuals with off-label use more frequently had cardiovascular diseases and strokes. Compared to CG1 and CG3, individuals with AP off-label use were more often female, had a lower prevalence of asthma/chronic obstructive pulmonary disease, and a higher use of psychotropic medications and opioids. Compared to CG2, individuals with off-label use were more often male and had a lower prevalence of diabetes, epilepsy, as well as a lower use of psychotropic medications and a higher use of opioids. Risperidone (43%) and quetiapine (39%) were the most used APs off-label.
Conclusion:
Alternative treatments are needed to curb off-label AP use among community-dwelling older adults, given the high prevalence of cardiovascular disease and stroke. Monitoring guidelines are needed to promote safer prescribing practices
Optimization of ultrasound-assisted extraction and quantitative analysis of natural antioxidants from Moroccan Opuntia ficus-indica flowers
No full textAbstract
Natural antioxidants were extracted from Opuntia ficus-indica flowers using an ultrasound-assisted extraction (UAE) method. The study focused on UAE optimization as well as the identification of phenolic compounds and has demonstrated enhanced polyphenols extraction efficiency over other green extraction methods. The UAE conditions were optimized, based on, total phenolic content (TPC), total flavonoid content (TFC) and the antioxidant activity of the different extracts were determined, using the response surface methodology. The studied factors were liquid-to-solid ratio, the ethanol concentration, and the extraction time. The content of the optimized extract was identified and quantified by using HPLC-ESI-DAD-MS analysis. The optimal UAE conditions were obtained for a liquid-to-solid ratio of 85 mL/g using ethanol concentration at 80 % during 32 min, which provided the maximum TPC (244.91 ± 9.31 mg GAE/g extract), TFC (91.68 ± 0.94 mg RE/g extract), DPPH (224.71 ± 7.78 μmol TE/g extract) and RP (426.79 ± 6.65 μmol TE/g extract), which matched well with predicted values. The optimized extract content allowed the identification of 16 compounds, where flavonoids, especially isorhamnetin-3-O-rutinoside (68.72 ± 1.16 mg/g extract) followed by quercetin-3-O-rutinoside (25.87 ± 0.23 mg/g extract) and isorhamnetin-3-O-glucoside (21.76 ± 1.64 mg/g), were the major phenolic compounds. In addition, comparing to conventional maceration and Soxhlet extraction methods, UAE markedly enhanced phenolic yield. These results underscore UAE as a sustainable and efficient strategy for increasing the amount of nutrient bioactive compounds yield while reducing the time, the energy and eventually the costs, highlighting its industrial potential to produce bioactive compound.Abstract
Natural antioxidants were extracted from Opuntia ficus-indica flowers using an ultrasound-assisted extraction (UAE) method. The study focused on UAE optimization as well as the identification of phenolic compounds and has demonstrated enhanced polyphenols extraction efficiency over other green extraction methods. The UAE conditions were optimized, based on, total phenolic content (TPC), total flavonoid content (TFC) and the antioxidant activity of the different extracts were determined, using the response surface methodology. The studied factors were liquid-to-solid ratio, the ethanol concentration, and the extraction time. The content of the optimized extract was identified and quantified by using HPLC-ESI-DAD-MS analysis. The optimal UAE conditions were obtained for a liquid-to-solid ratio of 85 mL/g using ethanol concentration at 80 % during 32 min, which provided the maximum TPC (244.91 ± 9.31 mg GAE/g extract), TFC (91.68 ± 0.94 mg RE/g extract), DPPH (224.71 ± 7.78 μmol TE/g extract) and RP (426.79 ± 6.65 μmol TE/g extract), which matched well with predicted values. The optimized extract content allowed the identification of 16 compounds, where flavonoids, especially isorhamnetin-3-O-rutinoside (68.72 ± 1.16 mg/g extract) followed by quercetin-3-O-rutinoside (25.87 ± 0.23 mg/g extract) and isorhamnetin-3-O-glucoside (21.76 ± 1.64 mg/g), were the major phenolic compounds. In addition, comparing to conventional maceration and Soxhlet extraction methods, UAE markedly enhanced phenolic yield. These results underscore UAE as a sustainable and efficient strategy for increasing the amount of nutrient bioactive compounds yield while reducing the time, the energy and eventually the costs, highlighting its industrial potential to produce bioactive compound
From the "University of Travel" to the "University of Hosting": Does Couchsurfing Hosting Provide Vicarious Travel and Vacation-Like Benefits?
No full textAbstract
Existing tourism research often centers on active travelers, overlooking those who participate through hosting, especially in contexts where international mobility is restricted. This study draws on bottom-up spillover and vicarious experience theories to examine the experiences of Iranian Couchsurfing hosts whose ability to travel abroad is constrained by gendered restrictions, passport limitations, flight bans, and sanctions. Based on in-depth interviews with 25 hosts from diverse regions in Iran, the study introduces the concept of ‘vicarious travel’ to describe the psychological, sociocultural, and indirect rewards of hosting. Hosting, in this context, emerges as a form of tourism participation that enhances personal growth, cultural learning, and enduring transformation. Framed through the metaphor of the ‘University of Hosting’, these findings highlight how non-commercial hospitality platforms can serve as informal educational spaces, offering meaningful engagement with global cultures. This study broadens understandings of tourism by centering host experiences in constrained mobility contexts.Abstract
Existing tourism research often centers on active travelers, overlooking those who participate through hosting, especially in contexts where international mobility is restricted. This study draws on bottom-up spillover and vicarious experience theories to examine the experiences of Iranian Couchsurfing hosts whose ability to travel abroad is constrained by gendered restrictions, passport limitations, flight bans, and sanctions. Based on in-depth interviews with 25 hosts from diverse regions in Iran, the study introduces the concept of ‘vicarious travel’ to describe the psychological, sociocultural, and indirect rewards of hosting. Hosting, in this context, emerges as a form of tourism participation that enhances personal growth, cultural learning, and enduring transformation. Framed through the metaphor of the ‘University of Hosting’, these findings highlight how non-commercial hospitality platforms can serve as informal educational spaces, offering meaningful engagement with global cultures. This study broadens understandings of tourism by centering host experiences in constrained mobility contexts
Civilised Panda viewing and visitor restrictions: an ethics of care approach to managing tourist misbehaviour
No full textAbstract
Introducing measures to regulate tourist misbehaviour at visitor attractions is an ongoing challenge. While previous research has explored the factors behind visitor misconduct, little attention has been given to how these measures are received and interpreted by the public. This study addresses this gap by investigating how restrictions to misbehaving visitors influence public reactions through the lens of the ethics of care. This framework is particularly relevant in China, where ‘civilised tourism’ has become a national discourse promoting responsible tourist behaviour. Using theme and sentiment analysis, the study examines 319 comments from 27 public announcements on WeChat posted by the Chengdu Research Base of Giant Panda Breeding following reports of tourist misbehaviour. The findings suggest that such restrictions elicit collective moral reinforcement towards misbehaviours, with WeChat users actively endorsing the measures to uphold civilised tourism norms. By integrating the ethics of care into discussions on tourist misbehaviour, this research underscores the importance of fostering responsible human-animal interactions and civil behaviours. Given China's increasing emphasis on wildlife conservation and the growing role of social media in shaping public discourse, this study aligns with China's national strategy of civilised tourism, offering insight into how science-based governance enhances public engagement in wildlife protection.Abstract
Introducing measures to regulate tourist misbehaviour at visitor attractions is an ongoing challenge. While previous research has explored the factors behind visitor misconduct, little attention has been given to how these measures are received and interpreted by the public. This study addresses this gap by investigating how restrictions to misbehaving visitors influence public reactions through the lens of the ethics of care. This framework is particularly relevant in China, where ‘civilised tourism’ has become a national discourse promoting responsible tourist behaviour. Using theme and sentiment analysis, the study examines 319 comments from 27 public announcements on WeChat posted by the Chengdu Research Base of Giant Panda Breeding following reports of tourist misbehaviour. The findings suggest that such restrictions elicit collective moral reinforcement towards misbehaviours, with WeChat users actively endorsing the measures to uphold civilised tourism norms. By integrating the ethics of care into discussions on tourist misbehaviour, this research underscores the importance of fostering responsible human-animal interactions and civil behaviours. Given China's increasing emphasis on wildlife conservation and the growing role of social media in shaping public discourse, this study aligns with China's national strategy of civilised tourism, offering insight into how science-based governance enhances public engagement in wildlife protection
Heat treatment of Myrtus communis leaves-derived biochar: Investigating dye removal and surface properties through density functional theory analysis
No full textAbstract
Dye contamination represents a significant threat to aquatic ecosystems, necessitating the development of effective water treatment technologies. Biochar-based materials have demonstrated considerable potential as sorbents for the removal of such pollutants. In this study, we introduce a novel Myrtus communis-derived biochar (MC-Biochar), prepared through heat treatment at 450 °C under room atmosphere. BET/NLDFT and SEM analyses revealed a significant increase in the specific surface area (SSA) of MC-Biochar, from 1.3 to 5.1 m2/g, along with enhanced porosity and textural properties compared to MC-Leaves. XPS analysis indicated changes in surface functional groups, with an increase in C–C/C–H (sp2) content and the formation of stable N-containing groups. CHNS-(O) analysis confirmed a substantial rise in C-content (from 48.45 to 69.04 wt%) and a decrease in O-content (from 34.51 to 15.61 wt%) in MC-Biochar compared to untreated MC-Leaves. These changes significantly improved the adsorption capacity of MC-Biochar for the Methyl orange (MO) dye, reaching a maximum capacity of 28.28 mg/g.
The Density Functional Theory analysis revealed that the MO dye exhibits increased reactivity at an acidic pH of 2, suggesting its ability to easily donate electrons to the MC-Biochar surface. The adsorption process primarily occurs between the oxygen-containing functional groups on MC-Biochar and the -NH and C=C bonds in the MO dye. These interactions are driven by multiple forces, including hydrogen bonding, van der Waals interactions, π-π stacking, and electrostatic attractions. Overall, the study demonstrates that MC-Biochar is a promising and sustainable adsorbent material for the remediation of dye pollutants in water treatment.Abstract
Dye contamination represents a significant threat to aquatic ecosystems, necessitating the development of effective water treatment technologies. Biochar-based materials have demonstrated considerable potential as sorbents for the removal of such pollutants. In this study, we introduce a novel Myrtus communis-derived biochar (MC-Biochar), prepared through heat treatment at 450 °C under room atmosphere. BET/NLDFT and SEM analyses revealed a significant increase in the specific surface area (SSA) of MC-Biochar, from 1.3 to 5.1 m2/g, along with enhanced porosity and textural properties compared to MC-Leaves. XPS analysis indicated changes in surface functional groups, with an increase in C–C/C–H (sp2) content and the formation of stable N-containing groups. CHNS-(O) analysis confirmed a substantial rise in C-content (from 48.45 to 69.04 wt%) and a decrease in O-content (from 34.51 to 15.61 wt%) in MC-Biochar compared to untreated MC-Leaves. These changes significantly improved the adsorption capacity of MC-Biochar for the Methyl orange (MO) dye, reaching a maximum capacity of 28.28 mg/g.
The Density Functional Theory analysis revealed that the MO dye exhibits increased reactivity at an acidic pH of 2, suggesting its ability to easily donate electrons to the MC-Biochar surface. The adsorption process primarily occurs between the oxygen-containing functional groups on MC-Biochar and the -NH and C=C bonds in the MO dye. These interactions are driven by multiple forces, including hydrogen bonding, van der Waals interactions, π-π stacking, and electrostatic attractions. Overall, the study demonstrates that MC-Biochar is a promising and sustainable adsorbent material for the remediation of dye pollutants in water treatment
What’s love got to do with it? Thinking touch in education with theories of love
No full textAbstract
Love and touch are commonly considered irrelevant, soft or unprofessional topics in education. Touch has a difficult history in educational institutions across international contexts. There is a strong body of research looking into violent touch in education. In this paper, we explore touch in educational institutions through the theory of love. Taking a diffractive approach, we present three cases showing, first, how love might be lacking in moments involving touch that are commonly framed as 'caring' and second, how loving touch may emerge in educational institutions in unexpected ways not controlled by adults. The paper proposes that touch in professional educational practice needs to be read though love. This enables identifying the nuances of what kinds of touch are inflicted upon children, what kinds of touches become forbidden and why, what kinds of touch children are made to endure in education and what kinds of 'touch deserts' become unintentionally created.Abstract
Love and touch are commonly considered irrelevant, soft or unprofessional topics in education. Touch has a difficult history in educational institutions across international contexts. There is a strong body of research looking into violent touch in education. In this paper, we explore touch in educational institutions through the theory of love. Taking a diffractive approach, we present three cases showing, first, how love might be lacking in moments involving touch that are commonly framed as 'caring' and second, how loving touch may emerge in educational institutions in unexpected ways not controlled by adults. The paper proposes that touch in professional educational practice needs to be read though love. This enables identifying the nuances of what kinds of touch are inflicted upon children, what kinds of touches become forbidden and why, what kinds of touch children are made to endure in education and what kinds of 'touch deserts' become unintentionally created
Lattice strengthening of Na4MnV(PO4)3 by dual doping as advanced cathode materials for sodium-ion batteries
No full textAbstract
Na4MnV(PO4)3 is a typical Na-super-ionic-conductor (NASICON), which shows great promise as cathode material for high-performance cost-effective sodium ion batteries. However, sluggish Na+ diffusion kinetics coupling with Jahn-Teller effect severely deteriorate its high-rate capability and long-term stability. In this work, we report a regulation strategy of jointly doping dual heteroatoms (Fe and Ni) to realize structural stability of Na4MnV(PO4)3 by shortening bond length and fast ion diffusion. The FMVN electrode delivers a highly reversible capacity of 98 and 79 mAh g−1 at 0.1C and 10C, respectively, while maintaining a stable cycling life over 2000 cycles at 10C. Theoretical calculations and kinetic analysis unveil that the regulation of crystal structure by Fe and Ni joint substitution effectively reduces the Na+ migration barrier and simultaneously increases the reversible capacity. Additionally, in-situ x-ray diffraction investigation verifies reversible structure evolution and minor volumetric change (∼4.91 %) in the sodiation/desodiation process. An assembled full cell (FMVN||HC) demonstrates an energy density of 353.9 Wh kg−1 at 0.1C and outstanding cycling durability with 89 % capacity retention after 100 cycles at 2C. This dual substitution strategy in this work holds great promise to develop high-performance NASICON-type cathodes for practical applications.Abstract
Na4MnV(PO4)3 is a typical Na-super-ionic-conductor (NASICON), which shows great promise as cathode material for high-performance cost-effective sodium ion batteries. However, sluggish Na+ diffusion kinetics coupling with Jahn-Teller effect severely deteriorate its high-rate capability and long-term stability. In this work, we report a regulation strategy of jointly doping dual heteroatoms (Fe and Ni) to realize structural stability of Na4MnV(PO4)3 by shortening bond length and fast ion diffusion. The FMVN electrode delivers a highly reversible capacity of 98 and 79 mAh g−1 at 0.1C and 10C, respectively, while maintaining a stable cycling life over 2000 cycles at 10C. Theoretical calculations and kinetic analysis unveil that the regulation of crystal structure by Fe and Ni joint substitution effectively reduces the Na+ migration barrier and simultaneously increases the reversible capacity. Additionally, in-situ x-ray diffraction investigation verifies reversible structure evolution and minor volumetric change (∼4.91 %) in the sodiation/desodiation process. An assembled full cell (FMVN||HC) demonstrates an energy density of 353.9 Wh kg−1 at 0.1C and outstanding cycling durability with 89 % capacity retention after 100 cycles at 2C. This dual substitution strategy in this work holds great promise to develop high-performance NASICON-type cathodes for practical applications