引用本文:
常照荣, 李苞, 李云平, 魏献军. 钴的表面修饰对Ni(OH)2电极性能的影响[J]. 应用化学,
2003, 20(4): 360-364.
Citation: CHANG Zhao-Rong, LI Bao, LI Yun-Ping, WEI Xian-Jun. Effects of Surface Cobalt Modifications on the Performance of Ni(OH)2 Electrode[J]. Chinese Journal of Applied Chemistry, 2003, 20(4): 360-364.
Citation: CHANG Zhao-Rong, LI Bao, LI Yun-Ping, WEI Xian-Jun. Effects of Surface Cobalt Modifications on the Performance of Ni(OH)2 Electrode[J]. Chinese Journal of Applied Chemistry, 2003, 20(4): 360-364.
钴的表面修饰对Ni(OH)2电极性能的影响
摘要:
以球形Ni(OH)2为修饰基体,研究比较了化学镀Co、沉积包覆Co(OH)2和物理混合CoO的3种表面修饰方式对Ni(OH)2电极性能的影响。充放电和循环伏安实验表明,包覆Co(OH)2和化学镀Co更能有效地改善充放电效率和可逆性,较大程度地提高活性物质的利用率和放电容量。扫描电镜显示,包覆Co(OH)2和化学镀Co可使Co元素均匀分布在球形Ni(OH)2表面。X射线衍射分析表明,包覆Co(OH)2和化学镀Co可有效地抑制充放电过程中γ-NiOOH的形成。讨论了3种表面修饰方式的利弊,认为包覆Co(OH)2效果较好,工艺简单,为可行的最佳修饰方式。
English
Effects of Surface Cobalt Modifications on the Performance of Ni(OH)2 Electrode
Abstract:
The spherical Ni(OH)2 was modified with cobalt by three methods:electroless plating with cobalt,coating with Co(OH)2 and mixing with CoO.The difference of three modification methods on the performance of Ni(OH)2 electrode has been investigated.The charge-discharge experiments and cyclic voltammetry results show that coating with Co(OH)2 layer and electroless plating with cobalt greatly improved the charge-discharge efficiency and the reversibility of Ni(OH)2 electrode,significantly improving the utilization of active material and specific capacity of the electrode.The SEM micrograph shows that the Co(OH)2 coated layer and electroless plated Co are uniformly distributed on the surface of the Ni(OH)2 grains.The result from X-ray diffraction patterns shows that the coated Co(OH)2 layer and electroless plated Co can effectively prevent the formation of γ-NiOOH.It is concluded that the method of coating a layer of Co(OH)2 on the spherical Ni(OH)2 is the best among three methods.It is cheaper and simpler in technology.
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