双功能
电催化剂
析氧
尖晶石
纳米材料基催化剂
氧化物
材料科学
氧气
氧还原
化学工程
金属
纳米技术
化学
无机化学
冶金
催化作用
电化学
电极
工程类
物理化学
有机化学
生物化学
作者
Sreya Roy Chowdhury,Apurba Ray,S.S. Chougule,Jiho Min,A. Anto Jeffery,Keonwoo Ko,Yunjin Kim,Sachindranath Das,Namgee Jung
出处
期刊:ACS applied energy materials
[American Chemical Society]
日期:2022-04-12
卷期号:5 (4): 4421-4430
被引量:14
标识
DOI:10.1021/acsaem.1c04008
摘要
Ni–Co oxides with varying Ni:Co ratios have been synthesized following a facile sol–gel procedure. The influence of variation in composition on the electrocatalytic activity of Ni–Co oxides (Ni:Co = 1:1, 1:2, 1:3, and 1:4) for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is explored in high-pH media. The lattice structure, size, morphology, and surface composition of the synthesized nanocatalysts have been carefully verified by using X-ray diffraction and various microscopic and spectroscopic techniques. Among the synthesized catalysts, the Ni–Co oxide with Ni:Co = 1:3 exhibits the best electrochemical performance with onset potentials of 0.86 and 1.51 V for ORR and OER, respectively. Furthermore, it demonstrates a small potential difference (0.82 V) between the potential corresponding to 10 mA cm–2 current density for OER and the half-wave potential for ORR. The catalyst exhibits admirable catalytic capability, almost comparable to that of the benchmark Pt/C catalyst and rivalling that of the IrO2/C catalyst for OER. This work shed light on the development of a highly active non-precious metal-based energy conversion catalyst and the effect of variation of compositional ratios on the electro-catalytic performance, which will further help rationally design efficient electrocatalysts for sustainable energy applications.
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