Mo doping provokes two electron reaction in MnO_(2)with ultrahigh capacity for aqueous zinc ion batteries  

作　　者：Xiaoyu Xia Yajun Zhao Yi Zhao Minggui Xu Wen Liu Xiaoming Sun 

机构地区：[1]State Key Laboratory of Chemical Engineering,College of Chemistry,Beijing University of Chemical Technology,Beijing 100029,China

出　　处：《Nano Research》2023年第2期2511-2518,共8页纳米研究（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.21935001 and 22101015);the National Key Research and Development Program of China(No.2018YFA0702002);the Program for Changjiang Scholars and Innovation Research Team in the University(No.IRT1205).

摘　　要：Rechargeable aqueous zinc ion batteries(AZIBs)based on manganese dioxide(MnO_(2))have received much attention for large-scale energy storage applications,however,their energy density is mainly limited by the one-electron reaction of Mn4+/Mn3+redox.Herein,Mo dopedδ-MnO_(2)(Mo-MnO_(2))is prepared and used as a high-performance cathode for AZIBs,which delivers an⇌⇌ultrahigh specific capacity of 652 mAh·g^(−1)at 0.2 A·g^(−1)based on the two-step two-electron redox reaction of Mn^(4+)Mn^(3+)Mn^(2+).Ex-situ structural analysis and density functional theory calculation reveal that the Mo^(5+)dopant plays an important role in enhancing the electronic conductivity of Mo-MnO_(2)and promoting Jahn–Teller distortion of octahedral[MnO_(6)]in ZnMn_(2)O_(4),which facilitates the second step redox reaction of Mn^(3+)/Mn_(2+).This work provides a novel cathode materials design with multi-electron redox chemistry to achieve high energy density in AZIBs.

关 键 词：zinc ion batteries Mo-doped MnO_(2) Jahn–Teller distortion two-electron reaction high energy density 

分 类 号：TM912[电气工程—电力电子与电力传动]