过电位
塔菲尔方程
析氧
材料科学
无定形固体
催化作用
电解水
电解质
异质结
化学工程
电化学
分解水
电解
制氢
无机化学
纳米技术
化学
电极
物理化学
结晶学
光催化
光电子学
生物化学
工程类
作者
Peng Wang,Tao Yu,Liping Hao,Xuanwen Liu
标识
DOI:10.1016/j.jpowsour.2023.233749
摘要
Efficient electrocatalysts are crucial for overcoming the sluggish kinetics of the oxygen-evolution reaction (OER) and facilitating the advancement of energy storage technologies such as metal-air batteries and hydrogen production through water electrolysis. This study proposes a synergistic approach combining amorphization and interfacial engineering to improve OER performance by fabricating heterojunctions between crystalline NiFe(OH)x and amorphous NiPx. The formation of a strongly coupled crystalline-amorphous heterojunction enables optimization of the electronic structure at the catalytic site and accelerates charge transfer at the interface, thereby improving the reaction kinetics. Notably, we investigate the dynamic adsorption behavior of PO43− during the OER process by introducing Na3PO4 into the electrolyte, revealing that P vacancies serve as active sites in promoting OER activity. Lastly, electrochemical measurements demonstrate that NiFe(OH)x/NiPx/NF exhibits a low overpotential of 220 mV at 10 mA cm−2 and Tafel slope of 35 mV·dec−1, surpassing the performance of laboratory-prepared noble metal catalysts and most reported NiFe-based electrocatalysts.
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