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

作　　者：Edugulla Girija Shankar Amit Kumar Das Jae Su Yu 

机构地区：[1]Department of Electronics and Information Convergence Engineering,Institute for Wearable Convergence Electronics,Kyung Hee University,Gyeonggi-do 17104,Republic of Korea

出　　处：《Journal of Materials Science & Technology》2022年第30期118-127,共10页材料科学技术（英文版）

基　　金：sponsored by the National Research Foundation of Korea(NRF)grant funded by the Korean government(MSIP)(Nos.2018R1A6A1A03025708 and 2020R1A2B5B01002318)。

摘　　要：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 

分 类 号：TM53[电气工程—电器] TQ127.11[化学工程—无机化工]