Institutional Repository of GuangZhou Institute of Energy Conversion, CAS
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Investigating the electrochemical performance of MnSe-supported SrZrO<sub>3</sub> perovskite oxide nanocomposite as an electrode material for supercapacitor
No full textCurrently, the advancement in energy storage technology is a worldwide-based vital challenge, so researchers focused on the development and design of promising electrode materials for energy storage equipment. Perovskite oxide and transition metal selenide nanocomposites can achieve better cycle stability, efficient electric conductivity, high capacity, excellent redox reaction, and inattentive flexibility as electrode materials for energy storage devices and supercapacitor applications. Herein, we present the designed, fabricated, and electrochemical properties of MnSe-supported SrZrO 3 nanocomposite via the Pechini method that exhibited more efficient capacitive performance than pristine SrZrO 3 and MnSe. The result of electrochemical testing indicates that the SrZrO 3 - MnSe nanocomposite electrode possessed a battery-type pseudocapacitive nature and displayed a boosted specific capacitance of 1204 Fg -1 at a 5 mV/s scan rate in aqueous 1 M KOH solution under a threeelectrode setup and maintained 95.2% retention after 3000th cycles. It also showed a higher electrochemical active surface area (1680.5 cm 2 ), higher energy density (40 Wh/Kg), long-term cyclic stability performance, and enhanced rate capability compared to other prepared products. As a result, these findings have shown that SrZrO 3 - MnSe nanocomposite can be considered as potential electrode materials and might have emerging applications in commercial products for energy storage devices and supercapacitors
In Situ Raman Insights into Palladium-Catalyzed Ethanol Electro-Oxidation Postoxygen Evolution
No full textAddressing the demand for versatile catalysts in regenerative fuel cells, this research delves into the stability and active degradation mechanism of a synthesized Pd/CNT catalyst during ethanol oxidation, employing an in situ Raman method. This innovative methodology unveils profound insights into the variations in the catalyst's behavior under different battery polarities. Notably, the catalyst exhibits enhanced stability and ethanol catalysis, maintaining a notable efficiency up to 150 cycles following high-potential scanning. The investigation reveals a potential-dependent characteristic in the Raman signal of *CO2-, establishing a direct correlation with the current density on Pd/CNT. These insights indicate the considerable potential of Pd/CNT in the advancement of efficient and resilient bifunctional oxygen electrode catalysts
A sustainable bio-circular way for biorefinery of rice straw into bioproducts based on energy-efficient pretreatment
No full textLignocellulosic biorefinery faces challenges associated with high energy input during pretreatment and high enzyme cost for enzymatic hydrolysis of cellulose, as well as the intricate valorization of lignin and hemicellulose. This study applied KOH-urea pretreatment to obtain maximum lignin removal of 68.93 % from rice straw at 80 degrees C for 60 min. The pretreatment consumed only 10.49 % of the total energy input. Five-time dilution of neutral black liquor can optimally stimulate the plant growth. Enzymatic conversion of KOH-urea-treated rice straw attained 92.02 % at 20 % solid concentration with 10 FPU cellulase/g substrate. The ethanol concentration achieved 37.02 g/L at a yield of 75.89 %. The solid residue after fermentation contained 42.40 % dietary fiber and 16.70 % protein, which is suitable as animal feed. This study developed a simple bio-circular way to concurrently produce liquid fertilizer, bioethanol, and animal feed from rice straw
Effects of enzyme-induced carbonate precipitation technique on multiple heavy metals immobilization and unconfined compressive strength improvement of contaminated sand
No full textEnzyme-induced carbonate precipitation (EICP) has been studied in remediation of heavy metal contaminated water or soil in recent years. This paper aims to investigate the immobilization mechanism of Zn 2 + , Ni 2 + , and Cr (VI) in contaminated sand, as well as strength enhancement of sand specimens by using EICP method with crude sword bean urease extracts. A series of liquid batch tests and artificially contaminated sand remediation experiments were conducted to explore the heavy metal immobilization efficacy and mechanisms. Results showed that the urea hydrolysis completion efficiency decreased as the Ca 2 + concentration increased and the heavy metal immobilization percentage increased with the concentration of Ca 2 + and treatment cycles in contaminated sand. After four treatment cycles with 0.5 mol/L Ca 2 + added, the immobilization percentage of Zn 2 + , Ni 2 + , and Cr(VI) were 99.99 %, 86.38 %, and 75.18 %, respectively. The microscale analysis results presented that carbonate precipitates and metallic oxide such as CaCO 3 , ZnCO 3 , NiCO 3 , Zn(OH) 2 , and CrO(OH) were generated in liquid batch tests and sand remediation experiments. The SEM-EDS and FTIR results also showed that organic molecules and CaCO 3 may adsorb or complex heavy metal ions. Thus, the immobilization mechanism of EICP method with crude sword bean urease can be considered as biomineralization, as well as adsorption and complexation by organic matter and calcium carbonate. The unconfined compressive strength of EICP-treated contaminated sand specimens demonstrated a positive correlation with the increased generation of carbonate precipitates, being up to 306 kPa after four treatment cycles with shear failure mode. Crude sword bean urease with 0.5 mol/L Ca 2 + added is recommended to immobilize multiple heavy metal ions and enhance soil strength
Effects of enzyme-induced carbonate precipitation technique on multiple heavy metals immobilization and unconfined compressive strength improvement of contaminated sand
No full textEnzyme-induced carbonate precipitation (EICP) has been studied in remediation of heavy metal contaminated water or soil in recent years. This paper aims to investigate the immobilization mechanism of Zn 2 + , Ni 2 + , and Cr (VI) in contaminated sand, as well as strength enhancement of sand specimens by using EICP method with crude sword bean urease extracts. A series of liquid batch tests and artificially contaminated sand remediation experiments were conducted to explore the heavy metal immobilization efficacy and mechanisms. Results showed that the urea hydrolysis completion efficiency decreased as the Ca 2 + concentration increased and the heavy metal immobilization percentage increased with the concentration of Ca 2 + and treatment cycles in contaminated sand. After four treatment cycles with 0.5 mol/L Ca 2 + added, the immobilization percentage of Zn 2 + , Ni 2 + , and Cr(VI) were 99.99 %, 86.38 %, and 75.18 %, respectively. The microscale analysis results presented that carbonate precipitates and metallic oxide such as CaCO 3 , ZnCO 3 , NiCO 3 , Zn(OH) 2 , and CrO(OH) were generated in liquid batch tests and sand remediation experiments. The SEM-EDS and FTIR results also showed that organic molecules and CaCO 3 may adsorb or complex heavy metal ions. Thus, the immobilization mechanism of EICP method with crude sword bean urease can be considered as biomineralization, as well as adsorption and complexation by organic matter and calcium carbonate. The unconfined compressive strength of EICP-treated contaminated sand specimens demonstrated a positive correlation with the increased generation of carbonate precipitates, being up to 306 kPa after four treatment cycles with shear failure mode. Crude sword bean urease with 0.5 mol/L Ca 2 + added is recommended to immobilize multiple heavy metal ions and enhance soil strength
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