镍
氧化还原
材料科学
电化学
氧化物
碱性电池
图层(电子)
扫描电子显微镜
金属泡沫
超级电容器
多孔性
化学工程
电极
石墨烯泡沫
氧化镍
无机化学
复合材料
冶金
化学
电解质
氧化石墨烯纸
物理化学
工程类
作者
Keyvan Malaie,Z Shahmohammadi Heydari,Thierry Brousse
出处
期刊:Journal of The Electrochemical Society
[The Electrochemical Society]
日期:2021-12-01
卷期号:168 (12): 120547-120547
被引量:7
标识
DOI:10.1149/1945-7111/ac4129
摘要
The extensive application of nickel foam (Ni foam) as current collector in supercapacitors has raised caveats on the contribution of the redox-active Ni foam to the measured capacities. However, due to the overlooked qualitative features (i.e., shapes) of the cyclic voltammograms (CVs), the redox reaction of the Ni foam oxide layer (NiFOL) has been frequently confused with the true electrochemical signature of the coated materials in alkaline solution. Herein, experimental CVs, scanning electron microscopy images, and estimations reveal that due to the high porosity of the Ni foam and its surface reactivity in alkaline solution (1–6 M KOH), the redox peak couple of the NiFOL can potentially be confused with or lead to misinterpretation of the true electrochemical features of the coatings. A classification of previous papers on a group of metal oxides investigated as battery-type or pseudocapacitive electrodes in the positive potential window is also presented to reveal the confusion between NiFOL and the coating when operated in alkaline solution.
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