合金
材料科学
氢气储存
微观结构
扫描电子显微镜
电化学
电镀(地质)
降水
冶金
化学工程
氢
交换电流密度
扩散
电极
复合材料
化学
塔菲尔方程
物理
有机化学
物理化学
地球物理学
气象学
工程类
热力学
地质学
作者
Xiangyu Zhao,Liqun Ma,Yujun Gao,Yi Ding,Xiaodong Shen
标识
DOI:10.1016/j.ijhydene.2008.12.027
摘要
Surface treatment by the fluorination treatment with an aqueous solution of KF and HF with a little addition of KBH4 followed by electroless Ni–P plating has been carried out to modify the surface structure and electrochemical properties of the La–Ni–Al hydrogen storage alloy. The results of scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) show that a Ni-rich and Al-poor layer forms after fluorination treatment. The electroless plating results in the precipitation of the nanometer-scale Ni–P particles with homogeneous distribution on the alloy surface. Both the treatments contribute to an increase in exchange current density, a decrease in charge-transfer resistance and the facility of hydrogen diffusion within the bulk alloy, leading to significant improvements on high rate dischargeability (HRD) of the alloy. The alloy treated by the composite treatment of the fluorination treatment and the following electroless plating possesses best overall electrode performance.
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