An aqueous 2.1 V pseudocapacitor with MXene and V-MnO_(2) electrodes  

作　　者：Jiabin Wu Qun Li Christopher E.Shuck Kathleen Maleski Husam N.Alshareef Jun Zhou Yury Gogotsi Liang Huang 

机构地区：[1]Wuhan National Laboratory for Optoelectronics,Huazhong University of Science and Technology,Wuhan 430074,China [2]Department of Materials Science and Engineering and A./.Drexel Nanomaterials Institute,Drexel University,Philadelphia,Pennsylvania 19104,USA [3]Materials Science and Engineering,Physical Science and Engineering Division,King Abdullah University of Science and Technology(KAUST),Thuwal 23955-6900,Saudi Arabia

出　　处：《Nano Research》2022年第1期535-541,共7页纳米研究（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.51972124,51902115,and 51872101);supported by King Abdullah University of Science and Technology(KAUST)under the KAUST-Drexel Competitive Research Grant(No.OSR-CRG2016-2963 sub 11206).

摘　　要：MXenes have shown record-breaking redox capacitance in aqueous electrolytes,but in a limited voltage window due to oxidation under anodic potential and hydrogen evolution under high cathodic potential.Coupling Ti3C2Tx Xene negative electrode with RuO_(2) or carbon-based positive electrodes expanded the voltage window in sulfuric acid electrolyte to about 1.5 V.Here,we present an asymmetric pseudocapacitor using abundant and eco-friendly vanadium doped MnO_(2) as the positive and Ti_(3)C_(2)Tx MXene as the negative electrode in a neutral 1M Li2SO4 electrolyte.This all-pseudocapacitive asymmetric device not only uses a safer electrolyte and is a much less expensive counter-electrode than RuO_(2),but also can operate within a 2.1 V voltage window,leading to a maximum energy density of 46 Wh/kg.This study also demonstrates the possibility of using MXene electrodes to expand the working voltage window of traditional redox-capable materials.

关 键 词：MXene pseudocapacitors metal oxides SUPERCAPACITORS manganese oxide 

分 类 号：O646.5[理学—物理化学] TM53[理学—化学]