析氧
材料科学
催化作用
氧化钴
电解
化学工程
电极
氧化物
氧气
克拉克电极
钴
退火(玻璃)
分解水
铜
氧化铜
X射线光电子能谱
无机化学
电化学
冶金
化学
电解质
生物化学
物理化学
工程类
光催化
作者
Geul Han Kim,Yoo Sei Park,Juchan Yang,Myeong Je Jang,Jaehoon Jeong,Jihoon Lee,Han-Saem Park,Yong Ho Park,Sung Mook Choi,Jooyoung Lee
出处
期刊:Nanomaterials
[MDPI AG]
日期:2021-03-08
卷期号:11 (3): 657-657
被引量:6
摘要
Developing high performance, highly stable, and low-cost electrodes for the oxygen evolution reaction (OER) is challenging in water electrolysis technology. However, Ir- and Ru-based OER catalysts with high OER efficiency are difficult to commercialize as precious metal-based catalysts. Therefore, the study of OER catalysts, which are replaced by non-precious metals and have high activity and stability, are necessary. In this study, a copper–cobalt oxide nanosheet (CCO) electrode was synthesized by the electrodeposition of copper–cobalt hydroxide (CCOH) on Ni foam followed by annealing. The CCOH was annealed at various temperatures, and the structure changed to that of CCO at temperatures above 250 °C. In addition, it was observed that the nanosheets agglomerated when annealed at 300 °C. The CCO electrode annealed at 250 °C had a high surface area and efficient electron conduction pathways as a result of the direct growth on the Ni foam. Thus, the prepared CCO electrode exhibited enhanced OER activity (1.6 V at 261 mA/cm2) compared to those of CCOH (1.6 V at 144 mA/cm2), Co3O4 (1.6 V at 39 mA/cm2), and commercial IrO2 (1.6 V at 14 mA/cm2) electrodes. The optimized catalyst also showed high activity and stability under high pH conditions, demonstrating its potential as a low cost, highly efficient OER electrode material.
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