Institutional Repository of Institute of Process Engineering, CAS (IPE-IR）
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Plasma induced rich oxygen vacancies fiber-like ZnO for efficient photocatalytic CO2 reduction
No full textPhotoreduction CO2 to value-added fuels (CO, CH4, etc.) driven by solar energy gives a green way for managing the global carbon balance. Through the radio-frequency thermal plasma treatment, fiber-like structured ZnO with rich oxygen defects were successfully designed and synthesized. The rich oxygen vacancies, created new energy level, could not only hinder the recombination of photo-generated electron/hole pairs, but also broaden the light absorption range. Besides, combined the natural advantages of one-dimensional (1D) structure, which could enable itself avoid aggregation during performance evolution within the humid environment and shorten the transfer path length of the photo-induced carriers and promote more electron/hole to migration to the surface of the photocatalyst. Therefore, when applied in CO2 photoreduction, the optimal fiber-like ZnO with rich oxygen defects catalyst behaved outstanding photocatalytic performance with a CO2-to-CO rate of 15.76 mu mol g- 1 h-1
Printability enhancement and mechanical property improvement via in situ synthesis of carbon nanotubes on aluminium powder
No full textA strategy of powder surface functional modification involving in situ synthesis of carbon nanotubes (CNTs) on Al powder is described to address the poor forming ability and inferior mechanical properties of Al parts produced by laser powder bed fusion. The obtained CNTs-Al composite powder exhibited a combination of high sphericity and flowability of powder, as well as good dispersion uniformity, bonding force and structural integrity of CNTs. The presence of CNTs significantly reduced the laser reflectivity and enhanced the printability of Al powder. The in situ synthesized CNTs contributed to reinforcement after printing and enhanced the tensile properties of printed sample. The printing behavior of powder, the distribution of reinforcement, and the tensile properties of printed sample were optimized by tuning the content of CNTs. The CNT-content in the composite powder was optimized at 0.96 wt% to achieve the synergy of high forming quality, densification and good tensile properties
Mortise-tenon joints reinforced Janus composite solid-state electrolyte with fast kinetics for high-voltage lithium metal battery
No full textBilayer composite solid-state electrolytes (CSSEs) are regarded as promising candidates to meet the requirements of high-voltage lithium metal batteries due to their exceptional compatibility with both opposite electrodes. However, such a configuration usually leads to additional interfacial impedance between CSSEs and discontin-uous Li+ migration process, resulting in deteriorated electrochemical performances. Herein, a Janus electrolyte with mortise and tenon joints (JCSSE) is proposed for enhancing interfacial compatibility. It is composed of poly (vinylidene fluoride-co-hexafluoropropylene)(P(VDF-HFP))/Li6.4La3Zr1.4Ta0.6O12layer toward cathode and poly (diallyldimethylammonium) bis(trifluoromethanesulfonyl)imide (PDADMATFSI)/UiO-66-SO3Li layer to Li-metal anode. Such a configuration enables not only intimate contact between the two electrolyte layers, but regulated Li+ coordination environment which would improve Li+ transference number. Both simulation and experimental characterization suggest that the defluorinated-P(VDF-HFP) with low highest occupied molecular orbital (HOMO) and PDADMATFSI with strong adsorption energy toward lithium metal can favor the formation of stable electrode/electrolyte interface. Optimized JCSSE exhibits a high ionic conductivity of 0.21 mS cm-1 at 25 degrees C and a wide electrochemical window of 5.0 V. As a result, Li//JCSSE//LiNi0.8Mn0.1Co0.1O2 battery could deliver remarkable cycling performances at 4.3 V for 100 cycles. In addition, JCSSE enables superior cyclability from 25 to 100 degrees C. High-voltage pouch cells employing JCSSE exhibit unexpected endurance under harsh conditions. This novel Janus electrolyte with tenon and mortise structure will accelerate the commercialization of high-energy -density lithium metal batteries
Self-assembled three-dimensional Si/carbon frameworks as promising lithium-ion battery anode
No full textSilicon, the most prospecting anode material for lithium batteries, has been receiving enormous attention, but silicon-based composite materials exhibit severe problems of structural instability and insufficient electron/ion conductivity, which is a major bottleneck limiting its practical applications. Herein, a three-dimensional (3D) silicon/carbon framework, CHSP, is designed to solve this problem. The nano-Si particles are well fixed by the interconnected porous conducting network, which not only enhances the ion/electron transport, but also buffers the volume change of Si effectively. As a result, the CHSP exhibits satisfying rate performance and a reversible capacity of as high as 1332 mA h g-1 at 1000 mA g-1 for 200 cycles. This research provides a practical approach to improve silicon anode performance in aspects of cycling stability and facile 3D structures synthesis process
Poly(ionic liquid) boosts overall performance of electrocatalytic reduction of low concentration of CO gas
No full textElectrocatalytic reduction of CO (CORR) provides a feasible way for not only CO2 conversion via tandem CO2-to-CO-to-C2+ process but also CO utilization from industrial exhaust gases. In this work, poly(ionic liquid) modified Cu catalyst (Cu@PIL) was employed as the electrocatalyst to convert low concentration CO gas to high-value C2+ products. An over 90 % faradaic efficiency of C2+ products (FEC2+) was obtained at a constant current density of 125.0 mA cm(-2) within a broad range of feedstock concentrations from 100.0 to 40.0 vol%. Remarkably, excellent comprehensive performance was achieved with feeding CO gas as less as 5.0 vol%, delivering a high FEC2+ of 71.1 % with high CO conversion (67.4 %) and high energetic efficiency (29.1 %). Mechanistic studies suggest the local enrichment of CO via adsorption and accelerated mass transfer by porous PIL layer as well as the suppression of hydrogen evolution reaction enables the CO-to-C2+ transformation with diluted CO gas
Open Project Fund from Guangdong Provincial Key Laboratory of Materials and Technol-ogy for Energy Conversion, Guangdong Technion-Israel Institute of Technology[MATEC2022KF0XX]
No full textDigital light processing additive manufacturing of thin dental porcelain veneers
No full textDigital light processing (DLP) 3D printing technology was applied to manufacture thin dental porcelain veneers. The prepared thin dental porcelain veneers showed excellent translucency and appearance. The median and mean particle sizes of the printed glass powders were 10.11 mu m and 12.03 mu m, respectively, with a unimodal distribution. The green glass compacts were printed layer by layer, with an individual layer thickness of 50 mu m. The results showed that, according to the thermal expansion coefficient (TEC) and the thermogravimetry/differential scanning calorimetry (TG/DSC), the debinding procedure of the green glass compacts was annealed at 320 degrees C for 120 min and 570 degrees C for 120 min, respectively. The results of the classical sintering kinetics models and SEM examination demonstrated that the glass compacts were sintered at 790 degrees C for 5 min. The flexural strength and the chemical solubility of the sintered glasses were 132.58 +/- 25.83 MPa and 18 mu m.cm(-2), respectively. Both flexural strength and chemical solubility met ISO 6872 criteria
Co-pyrolysis behaviors of coal and polyethylene by combining in-situ Py-TOF-MS and reactive molecular dynamics
No full textCo-pyrolysis of waste plastics and low-rank coal is a promising approach to deal with the serious waste crisis and improve the clean utilization of low-rank coal. In this work, the comprehensive co-pyrolysis behaviors of low -rank coal and polyethylene plastics were explored systematically by combining TG experiment, in-situ Py-TOF-MS technique, and ReaxFF MD simulation. The consistent results were obtained among three approaches to demonstrate the positive interaction exists between coal and PE during the co-pyrolysis process, which leads to volatile yield increasing with PE addition. TG experimental results showed that the blending ratio of 7:3 for coal and PE has the strongest synergy during the co-pyrolysis process, while Py-TOF-MS experimental results unraveled that the synergistic effect of coal and PE was determined by changing the content of pyrolysis products rather than by producing cross-reaction products. The PE addition significantly reduced the yield of MAHs and normal alkyl-substituted monophenols and increased the yield of olefins, alkanes, and aromatic derivatives. ReaxFF MD simulation results complement the experimental observation to obtain similar weight loss profiles with TG experiments and consistent identification of major representative tar pyrolyzates with Py-TOF-MS ex-periments. Particularly, the detailed gas evolving trends and the underlying bond-breaking reactions of C-C, C-O, and C-H bonds were revealed by ReaxFF MD, which indicates PE addition promotes bond breaking of C-C and C-H to enhance more tar generation. The combination of experiments and ReaxFF MD simulations can capture the comprehension of the co-pyrolysis process between low-rank coal and PE, which can be extended to other co-pyrolysis applications for related solid fuels