水滑石
超级电容器
电解质
结晶度
化学工程
材料科学
电化学
碱金属
无机化学
过电位
层状双氢氧化物
润湿
电极
化学
氢氧化物
有机化学
复合材料
催化作用
物理化学
工程类
作者
Liyin Hou,Xufeng Zhou,Lina Kong,Zhipeng Ma,Li Su,Zhaoping Liu,Guangjie Shao
出处
期刊:Nanomaterials
[MDPI AG]
日期:2023-03-27
卷期号:13 (7): 1192-1192
被引量:5
摘要
Hydrotalcite, first found in natural ores, has important applications in supercapacitors. NiCoAl-LDH, as a hydrotalcite-like compound with good crystallinity, is commonly synthesized by a hydrothermal method. Al3+ plays an important role in the crystallization of hydrotalcite and can provide stable trivalent cations, which is conducive to the formation of hydrotalcite. However, aluminum and its hydroxides are unstable in a strong alkaline electrolyte; therefore, a secondary alkali treatment is proposed in this work to produce cation vacancies. The hydrophilicity of the NiCoAl-OH surface with cation vacancy has been greatly improved, which is conducive to the wetting and infiltration of electrolyte in water-based supercapacitors. At the same time, cation vacancies generate a large number of defects as active sites for energy storage. As a result, the specific capacity of the NiCoAl-OH electrode after 10,000 cycles can be maintained at 94.1%, which is much better than the NiCoAl-LDH material of 74%.
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