Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5147886 | International Journal of Hydrogen Energy | 2016 | 6 Pages |
Abstract
The CoBâxA2B7 composites (x = 0-30 wt.%) were prepared by ball milling the powdery mixture of both pristine alloys. As negative electrodes in nickel-metal hydride (Ni/MH) rechargeable batteries, the CoBâxA2B7 composites exhibit a superior electrochemical performance. It has a maximum discharge capacity (Cmax) of up to 730 mAh/g and its high-rate dischargeability (HRD) is significantly increased to 82.5% for x = 30 wt.% at a discharge density of 900 mA/g. The capacity retention rate (C100/Cmax) is increased firstly from 37.1% (x = 0 wt.%) to 45.6% (x = 5 wt.%), then decreased to 42.4% (x = 30 wt.%). The anodic polarization (AP) and potential-step measurements indicate that the diffusion ability of hydrogen atoms in the composite electrodes is distinctly improved by doping with A2B7-type alloy.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Shujun Qiu, Jianling Huang, Feihong Shen, Rui Pang, Hailiang Chu, Yongjin Zou, Cuilin Xiang, Erhu Yan, Fen Xu, Lixian Sun, Huaiying Zhou, Liuzhang Ouyang, Min Zhu,