Walnut septum-derived hierarchical porous carbon for ultra-high-performance supercapacitors  

作　　者：Meng Zhou Sheng-Xue Yan Qing Wang Ming-Xiu Tan Deng-Yang Wang Zi-Qi Yu Shao-Hua Luo Ya-Hui Zhang Xin Liu 

机构地区：[1]School of Materials Science and Engineering,Northeastern University,Shenyang 110819,China [2]State Key Laboratory of Rolling and Automation,Northeastern University,Shenyang 110819,China [3]School of Resources and Materials,Northeastern University at Qinhuangdao,Qinhuangdao 066004,China [4]Hebei Key Laboratory of Dielectric and Electrolyte Functional Material,Qinhuangdao 066004,China [5]Qinhuangdao Key Laboratory of Advanced Energy Storage and Conversion Technology,Qinhuangdao 066004,China

出　　处：《Rare Metals》2022年第7期2280-2291,共12页稀有金属（英文版）

基　　金：financially supported by the National Natural Science Foundation of China (Nos. 51874079 and 11775226);the Natural Science Foundation of Hebei Province (Nos. E2018501091, E2020501001 and E2021501029);Hebei Province Key Research and Development Plan Project (No.19211302D);the Natural Science Foundation of Liaoning Province (No. 2019-MS-110);the Fundamental Research Funds for the Central Universities (No. N2023040 and N2123035)

摘　　要：The conversion of biomass waste into eco-nomical and high-performance energy storage devices receives significant attention.Herein,a facile and green method to prepare porous active carbon from walnut sep-tum is applied to the electrode materials of supercapacitors.The effect of chemical etching reagent(KOH)on the microstructure and specific capacitance of the porous car-bon are explored.The modified BC-2.0,with a KOH/walnut septum mass ratio of 2∶1,exhibits large specific surface area of 1003.9 m^(2)·g^(-1)with hierarchical micro-mesoporous structures.BC-2.0 reveals a superior specific capacitance of 457 F·g^(-1)at 1 A·g^(-1).The flexible sym-metric supercapacitor in gel electrolyte(KOH/PVA)exhi-bits considerable synergetic energy-power output performance.The results indicate that walnut septum is a better precursor to obtain activated carbons relative to other biomass carbon sources.The large mesoporosity after activation effectively boosts the electrochemical properties of supercapacitor.Consequently,the walnut septum has potential to be a superior electrode material for supercapacitors.

关 键 词：ACTIVATION Biocarbon Micro-mesoporous structure SUPERCAPACITOR High specific capacitance 

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