Effects of different electrolytes containing Na2WO4 on the electrochemical performance of nickel hydroxide electrodes for nickel-metal hydride batteries
Effects of different electrolytes containing Na2WO4 on the electrochemical performance of nickel hydroxide electrodes for nickel-metal hydride batteries
复制标题
不同含Na2WO4电解液对镍氢电池氢氧化镍电极电化学性能的影响
DOI：
10.1016/j.ijhydene.2013.12.070
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发表时间：
2014-02-25
影响因子：
7.2
通讯作者：
Wang, Haijiang
中科院分区：
文献类型：
--
作者：
Shangguan, Enbo;Li, Jing;Wang, Haijiang
为了改善镍氢电池氢氧化镍电极的高温性能，在KOH-LiOH和NaOH-LiOH两种二元电解液中添加钨酸钠（Na 2 WO 4）。采用循环伏安法（CV）、电化学阻抗谱（EIS）、扫描电镜（SEM）、X射线能谱（EDX）、X射线衍射（XRD）和充放电测试等手段，系统研究了电解液组成对镍电极电化学性能的影响。发现添加（1.0wt%）Na 2 WO 4，镍电极的性能显着提高在NaOH和KOH电解质在70 ℃。这是由于在镍电极表面沉积了WO3.2H2 O固体膜，有利于提高析氧过电位，减缓析氧速率，降低电荷转移电阻。版权所有（C）2013，氢能出版物有限责任公司。由爱思唯尔有限公司出版。保留所有权利。
To improve the high-temperature performance of the nickel hydroxide electrodes in nickel -metal hydride batteries, sodium tungstate (Na2WO4) used as an electrolyte additive has been added into two types of binary electrolytes (KOH-LiOH and NaOH-LiOH) in this study. The effects of electrolyte composition on the electrochemical performance of nickel electrodes have been systematically investigated via a combination of cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), scanning electron microscope (SEM), energy-dispersive X-ray analysis (EDX), X-ray diffraction (XRD) and charge/discharge tests. It is found that by adding (1.0 wt.%) Na2WO4, the performance of nickel electrodes is significantly improved in both NaOH and KOH electrolytes at 70 degrees C. The improved performance can be attributed to the deposition of WO3.2H(2)O solid film on the surface of nickel electrode, which is beneficial to the increase in oxygen evolution overpotential, the slow-down of oxygen evolution rate and the decrease in charge-transfer resistance. Copyright (C) 2013, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.