过电位
析氧
材料科学
电解
电极
钝化
X射线光电子能谱
碱性水电解
氧气
电化学
分解水
化学工程
电解水
冶金
化学
纳米技术
工程类
电解质
有机化学
物理化学
催化作用
光催化
生物化学
图层(电子)
作者
Man Ho Han,Young‐Jin Ko,Seung Yeon Lee,Chulwan Lim,Woong Hee Lee,Min Wook Pin,Jai Hyun Koh,Jihyun Kim,Woong Kim,Byoung Koun Min,Hyung‐Suk Oh
标识
DOI:10.1016/j.jpowsour.2021.230953
摘要
Although stainless steel is a promising candidate for oxygen evolution reaction (OER) electrodes, chalcogenization is typically necessary to avoid surface passivation. Herein, we modify the surface of SUS304 by selenization under mild conditions. The optimal selenization temperature (500 °C) is determined by analyzing the surface morphology and elemental distribution. The electrode composition and the role of Se in improving OER activity are clarified using X-ray photoelectron spectroscopy depth profiling. The electrode selenized at 500 °C is rich in oxygen vacancies and had a high Ni content after electrochemical pre-activation. Moreover, the overpotential is only 284.3 mV at 10 mA cm−2 and no potential degradation occurred over 160 h, indicating excellent stability under alkaline conditions. Further, high stability is achieved during CO2 reduction in a real water matrix. These results provide new insights for modifying commercial stainless-steel electrodes to maximize OER activity for alkaline water splitting and neutral CO2 electrolysis.
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