塔菲尔方程
电催化剂
过电位
分解水
双功能
材料科学
析氧
石墨烯
氧化物
化学工程
催化作用
无机化学
电化学
纳米技术
化学
冶金
电极
物理化学
有机化学
光催化
工程类
作者
Kaiming Guo,Firdoz Shaik,Jun Yang,Bin Jiang
出处
期刊:Journal of electrochemical energy conversion and storage
[ASME International]
日期:2021-10-05
卷期号:19 (2)
被引量:6
摘要
Abstract Water splitting is considered as a potential sustainable and green technology for producing mass hydrogen and oxygen. A cost-effective self-supported stable electrocatalyst with excellent electrocatalytic performance in a wide pH range is greatly required for water splitting. This work reports on the synthesis and anchoring of Fe1CoxNiyP nanoparticles on vertically aligned reduced graphene oxide array (VrGO) via electroless plating. The catalytic activity of Fe1CoxNiyP nanoparticles is tuned finely by tailoring the cationic ratio of Co and Ni. Fe1Co2Ni1P/VrGO exhibits the lowest overpotential (109 and 139 mV) at 10 mA cm−2 and lowest tafel slope (133 and 31 mV dec−1) for hydrogen evolution reaction in 1.0 M KOH and 0.5 M H2SO4, respectively. Fe1Co1Ni2P/VrGO exhibits the lowest overpotential (342 mV) at 10 mA cm−2 with lowest tafel slope (60 mV dec−1) for oxygen evolution reaction. The enhanced performance of the electrocatalyst is attributed to improved electrical conductivity, synergistic effects, and beneficial electronic states caused by the appropriate atomic ratio of Co and Ni in the bifunctional electrocatalyst. This study helps to explore the effect of variable cationic ratio in the cost-effective ternary iron group metal phosphides electrocatalysts to achieve enhanced electrocatalytic performance for water splitting in a wide pH range.
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