Electrolyte effect on electrochemical behaviors of manganese fluoride material for aqueous asymmetric and symmetric supercapacitors  

作　　者：Zheng-Hua He Jian-Fei Gao Ling-Bin Kong 

机构地区：[1]State Key Laboratory of Advanced Processing and Recycling of Non-Ferrous Metals,Lanzhou University of Technology,Lanzhou,730050,China [2]School of Materials Science and Engineering,Lanzhou University of Technology,Lanzhou,730050,China

出　　处：《Rare Metals》2024年第3期1048-1061,共14页稀有金属（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(No.52261040 and 51971104)。

摘　　要：Exploring wide voltage window materials is not only an available measure to enhance the energy density of hybrid supercapacitor(HSCs),but also avoids the dynamic mismatch caused by different energy storage mechanisms of two electrodes in assembled symmetrical HSC.However,there are few reports about the wide potential window materials except Bi_(2)O_(3)and VO_(2).Therefore,the MnF_(2)synthesized by solvothermal reaction was served as the electrode for HSC.The MnF_(2)exhibited electrochemical activity in alkaline solution in three-electrode system,especially with a wide potential window from-0.8 to+0.5 V in 2 mol·L^(-1)NaOH.Furthermore,the assembled MnF_(2)//MnF_(2)symmetrical HSC had a potential window of 1.5 V,and it exhibited outstanding long-cycle capability.Meanwhile,when MnF_(2)was taken as the negative and positive respectively,the potential windows of asymmetric devices CoMoO_(4)//MnF_(2)and MnF_(2)//Activated Carbon(AC)could reach 1.3 and 1.45 V,respectively,showing excellent cycle stability.This work shows that MnF_(2)material has great research value in HSC,and provides a new research direction for developing high-performance devices.

关 键 词：Manganese fluoride Potential window Hybrid supercapacitors Electrochemical performance 

分 类 号：TM53[电气工程—电器] O646[理学—物理化学]