材料科学
电容
超级电容器
氮化物
法拉第效率
阳极
氧化钌
循环伏安法
氧化物
电容器
分析化学(期刊)
化学工程
无机化学
电化学
纳米技术
电极
化学
冶金
电压
电气工程
物理化学
工程类
图层(电子)
色谱法
作者
T.‐C. Liu,Wendy Pell,B. E. Conway,S. L. Roberson
出处
期刊:Journal of The Electrochemical Society
[The Electrochemical Society]
日期:1998-06-01
卷期号:145 (6): 1882-1888
被引量:629
摘要
Ruthenium oxide , formed as a thin film on a Ru or Ti metal substrate, exhibits a large specific (cm−2) and almost constant, electrochemical capacitance over a 1.35 V range in aqueous . This behavior has led to its investigation and use as a material for fabrication of supercapacitor devices. However, its cost has encouraged search for other materials exhibiting similar behavior. Work reported in the present paper evaluates two nitrides of Mo, and MoN, as substitutes for . It is shown that very similar capacitance behavior to that of , films arises, e.g., in cyclic voltammetry and dc charging curves; in the former, almost mirror‐image anodic and cathodic current‐response profiles, characteristic of a capacitor, arise. However, the nitride materials have a substantially smaller voltage operating range of only some 0.7 V due to electrochemical decomposition above ca. 0.7 V vs. RHE. This limits their usefulness as a substitute for . Of interest is that the nitride films exhibit potential‐decay and potential‐recovery on open circuit after respective charge and forced discharge. The decay and recovery processes are logarithmic in time, indicating the role of internal faradaic charge redistribution processes.
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