Enhanced electrochemical properties of Ti1.4V0.6Ni with Mo2C or WC coating as negative electrodes for Ni-MH battery

被引：16

作者：

Lin, Jing ^{[1
,2
]}

Cao, Zhanyi ^{[1
]}

Sun, Lianshan ^{[1
,2
]}

Liang, Fei ^{[2
]}

Wu, Yaoming ^{[2
]}

Wang, Limin ^{[2
]}

机构：

[1] Jilin Univ, Coll Mat Sci & Engn, Changchun 130022, Peoples R China

[2] Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Rare Earth Resource Utilizat, Changchun 130022, Peoples R China

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2017年 / 695卷

基金：

中国国家自然科学基金;

关键词：

Composite materials; Electrode materials; Electrochemical reactions; HYDROGEN EVOLUTION REACTION; SURFACE-AREA MO2C; STORAGE PROPERTIES; CYCLING STABILITY; TUNGSTEN CARBIDE; PHASE-STRUCTURE; TI-ZR; ELECTROCATALYSTS; ALLOYS; NANOPARTICLES;

D O I：

10.1016/j.jallcom.2016.10.212

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Composites of Ti1.4V0.6Ni coated with Mo2C or WC are prepared through ball milling, and their electrochemical properties are investigated as negative electrode materials in a Ni-MH battery system. Mo2C and WC disperse adequately on the surface of the Ti1.4V0.6Ni alloy to form Ti1.4V0.6Ni@Mo2C and Ti1.4V0.6Ni@WC, respectively. The composites exhibit higher electrochemical hydrogen storage capacity and more stable cycling stability than the bare alloy. Particularly, the capacity conservation rate of Ti1.4V0.6Ni@WC is 67.4% after 200 cycles, and it increases by 29.5% compared with Ti1.4V0.6Ni alloy. A study of the kinetics demonstrates that Mo2C or WC coating accelerates the charge-transfer reaction and increases the electrochemical activity of the Ti1.4V0.6Ni electrode. The improvements to electrochemical properties of Ti1.4V0.6Ni may be due to the proper Mo2C or WC coating with copacetic electrocatalytic activity and anti-pulverization ability. (C) 2016 Elsevier B.V. All rights reserved.

引用

页码：208 / 214

页数：7

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