Free-Standing α-MoO3/Ti3C2 MXene Hybrid Electrode in Water-in-Salt Electrolytes

扫码查看

原文链接

万方数据

外文摘要：While transition-metal oxides such as α-MoO3 provide high capacity,their use is limited by modest electronic conductivity and electrochemical instability in aqueous electrolytes.Two-dimensional(2D)MXenes,offer metallic conductivity,but their capacitance is limited in aqueous electrolytes.Insertion of partially solvated cations into Ti3C2 MXene from lithium-based water-in-salt(WIS)electrolytes enables charge storage at positive potentials,allowing a wider potential window and higher capacitance.Herein,we demonstrate that α-MoO3/Ti3C2 hybrids combine the high capacity of α-MoO3 and conductivity of Ti3C2 in WIS(19.8 m LiCI)electrolyte in a wide 1.8 V voltage window.Cyclic voltammograms reveal multiple redox peaks from α-MoO3 in addition to the well-separated peaks of Ti3C2 in the hybrid electrode.This leads to a higher specific charge and a higher rate capability compared to a carbon and binder containing α-MoO3 electrode.These results demonstrate that the addition of MXene to less conductive oxides eliminates the need for conductive carbon additives and binders,leads to a larger amount of charge stored,and increases redox capacity at higher rates.In addition,MXene encapsulated α-MoO3 showed improved electrochemical stability,which was attributed to the suppressed dissolution of α-MoO3.The work suggests that oxide/MXene hybrids are promising for energy storage.

外文关键词：

free-standing electrodeTi3C2 MXenewater-in-salt electrolytesα-MoO3 nanobelts

作者：

Mohit Saraf、Christopher E.Shuck、Nazgol Norouzi、Kyle Matthews、Alex Inman、Teng Zhang、Ekaterina Pomerantseva、Yury Gogotsi

展开 >

作者单位：

A.J.Drexel Nanomaterials Institute and Department of Materials Science and Engineering,Drexel University,Philadelphia PA 19104,USA

基金：

United States-India Educational Foundation,New Delhi,India,for the Fulbright-Nehru Postdoctoral FellowshipFluid Interface Reacions and Transport(FIRST)CenterU.S.Department of Energy,Office of Science,Basic Energy Sciences.SynthesisCenter for Mesoscale Transport PropertiesU.S.Department of Energy,Office of Science,Basic Energy Sciences

项目编号：

2558/FNPDR/2020DE-SC0012673

出版年：

2023

DOI：

10.1002/eem2.12516

能源与环境材料(英文)

CSCD

ISSN：

年,卷(期)：2023.6(4)

参考文献量46