Developing highly efficient and inexpensive bifunctional electrocatalysts is a grand challenge in water splitting process. In this article, NiFe electrocatalysts on nickel foam are prepared by electrodeposition method using high current density. The optimized NiFe electrocatalyst presented excellent electrocatalytic activities in 1.0 M KOH medium with low overpotentials of 100 mV for hydrogen evolution reaction and 230 mV for oxygen evolution reaction to achieve 10 mA·cm−2, respectively. Moreover, the optimized NiFe electrocatalyst as bifunctional electrocatalyst toward overall water splitting only needs a small cell voltage of 1.57 V to obtain 10 mA·cm−2. The extremely electrocatalytic performance of NiFe electrocatalyst is attributed to the fast charge transfer kinetics, large electrochemical surface area, and the conductive nickel foam.

中文翻译：

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NiFe/泡沫镍的高电流密度电沉积作为双功能电催化剂用于碱性电解质中的整体水分解

开发高效廉价的双功能电催化剂是水分解过程中的一大挑战。在本文中，采用高电流密度的电沉积方法制备了泡沫镍上的 NiFe 电催化剂。优化后的 NiFe 电催化剂在 1.0 M KOH 介质中表现出优异的电催化活性，析氢反应过电位为 100 mV，析氧反应过电位为 230 mV，分别达到 10 mA·cm-2。此外，优化的 NiFe 电催化剂作为双功能电催化剂对整体水分解只需要 1.57 V 的小电池电压即可获得 10 mA·cm-2。NiFe 电催化剂极好的电催化性能归因于快速的电荷转移动力学、大的电化学表面积和导电泡沫镍。