电催化剂
分解水
双功能
析氧
吉布斯自由能
化学工程
材料科学
电解
氢
催化作用
电极
纳米技术
化学
电化学
物理化学
电解质
热力学
光催化
物理
工程类
有机化学
生物化学
作者
Yifan Zhao,Shuwen Zhao,Ji Chen,Yao Zhou,Peilong Zhao,Ruijie Dai,Weijie Zhou,Peizhi Yang,Hua Zhang,Anran Chen
标识
DOI:10.1016/j.jcis.2022.12.002
摘要
Electrocatalytic water splitting to generate high-quality hydrogen is an attractive renewable energy storage technology; however, it is still far from becoming a real-world application. In this study, we developed an effective and stable nickel foam-supported Fe2[email protected]4 heterostructure electrocatalyst for overall water splitting. As expected, the as-obtained Fe2[email protected]4/NF electrocatalyst exhibits superb bifunctional catalytic activity and only requires extremely low overpotentials of 53 and 249 mV to achieve a current density of 10 mA cm−2 for the hydrogen and oxygen evolution reactions, respectively. Moreover, a two-electrode electrolyzer assembled using Fe2[email protected]4/NF as electrodes operates at the low cell voltage of 1.54 V at 10 mA cm−2, showing excellent long-term stability for 140 h. Theoretical calculations indicate that the surface electronic structure is effectively adjusted by the generated heterointerfaces between the Fe2P and CoMnP4 in a two-phase matrix, resulting in a Gibbs free energy of hydrogen adsorption close to zero and high intrinsic activity. This innovative strategy is a valuable route for producing low-cost high-performance bifunctional electrocatalysts for water splitting.
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