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Science Bulletin 2024年第8期69卷 1109-1121页

作者：郭轲刘明恺王彬娄佳慧郝勇裴刚金红光 Department of Thermal Science and energy Engineering University of Science and Technology of ChinaHefei 230026China Institute of Engineering Thermophysics Chinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Wu Zhonghua College North China Electric Power UniversityBeijing 102206China

Hydrogen is widely regarded as a sustainable energy carrier with tremendous potential for low-carbon energy transition.solar photovoltaic-driven water electrolysis(PV-E)is a clean and sustainable approach of hydrogen production,but with major barriers of high hydrogen production costs and limited capacity.Steam methane reforming(SMR),the state-of-the-art means of hydrogen production,has yet to overcome key obstacles of high reaction temperature and CO_(2)emission for sustainability.This work proposes a solar thermo-electrochemical SMR approach,in which solar-driven mid/low-temperature SMR is combined with electrochemical H_(2)separation and in-situ CO_(2)capture.The feasibility of this method is verified experimentally,achieving an average methane conversion of 96.8%at a dramatically reduced reforming temperature of 400-500℃.The underlying mechanisms of this method are revealed by an experimentally calibrated model,which is further employed to predict its performance for thermoelectrochemical hydrogen production.Simulation results show that a net solar-to-H_(2)efficiency of26.25%could be obtained at 500℃,which is over 11 percentage points higher than that of PV-E;the first-law thermodynamic efficiency reaches up to 63.27%correspondingly.The enhanced efficiency also leads to decreased fuel consumption and lower CO_(2)emission of the proposed solar-driven SMR system.Such complementary conversion of solar PV electricity,solar thermal energy,and low-carbon fuel provides a synergistic and efficient means of sustainable H_(2)production with potentially long-term solar energy storage on a vast scale.

关键词： Hydrogen solar fuel Thermo-electrochemical conversion Decarbonization solar energy storage

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Entire onion source-derived redox porous carbon electrodes towards efficient quasi-solid-state solar charged hybrid supercapacitor

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Journal of Materials Science & Technology 2022年第30期125卷 118-127页

作者： Edugulla Girija Shankar Amit Kumar Das Jae Su Yu Department of Electronics and Information Convergence Engineering Institute for Wearable Convergence ElectronicsKyung Hee UniversityGyeonggi-do 17104Republic of Korea

Biomass-derived electrodes inherently containing redox-active species have gained extensive attention recently due to their availability,eco-friendliness,sustainability,and low cost.We report novel binder-free faradic surface redox onion-derived carbon positive electrode with nano regime particles by hydrothermal synthesis and Na^(+)and Cl^(−)ions diffused porous carbon negative electrode via a carbonization method.energy-dispersive X-ray spectroscopy and X-ray photoelectron spectroscopy confirmed the presence of oxidized sulfur and(N-6)pyridinic N-based redox groups inherently present in the as-prepared compounds.The electrochemical analysis of the positive electrode revealed its faradic redox type of energy storage mechanism with an excellent specific capacitance of 1805 Fg^(-1) at the current density of 3 Ag^(-1) as well as appreciable long-term cycling stability(76.8%retention after 10000 charge-discharge cycles).Meanwhile,the negative electrode exhibited a maximum specific capacitance of 373 Fg^(-1) at 1 Ag^(-1) with outstanding long-term cycling stability(100.7%retention after 10000 cycles).The fabricated polyvinyl alcohol-potassium hydroxide gel electrolyte-based quasi-solid-state hybrid supercapacitor(QHSC)delivered excellent energy density and power density of 19.94 Wh kg^(-1) and 374.99 W kg^(-1),respectively with an ultralong cyclic life(102.3% retention)over 10000 cycles.Furthermore,the QHSC was connected to a solar panel to store renewable energy.solar charged QHSC effectively powered a speedometer,enlightening its potential application in advanced sustainable energy storage systems.

关键词： Binder-free Biomass Green source Hybrid supercapacitor solar energy storage Faradic redox type

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