Hierarchical FeCo2S4@CoFe layered double hydroxide on Ni foam as a bifunctional electrocatalyst for overall water splitting
Hierarchical FeCo2S4@CoFe layered double hydroxide on Ni foam as a bifunctional electrocatalyst for overall water splitting
复制标题
泡沫镍上的分层 FeCo2S4@CoFe 层状双氢氧化物作为整体水分解的双功能电催化剂
DOI：
10.1039/c9cy01896d
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发表时间：
2020-03-07
影响因子：
5
通讯作者：
Cui, Yimin
中科院分区：
文献类型：
--
作者：
Huang, Yunxia;Chen, Xiaojuan;Cui, Yimin
设计高效、低成本的同时用于析氢反应（HER）和析氧反应（OER）的双功能电催化剂对于水电解制氢具有重要意义。在此，通过水热-硫化-电沉积三步法成功制备了分级FeCo2S4@CoFe层状双氢氧化物（LDH）核壳结构催化剂。独特的结构可以为电化学反应提供更丰富的催化活性位点。由此产生的 FeCo2S4@CoFe LDH 电极仅需要 115 和 247 mV 的过电势即可分别在 1 M KOH 电解质中达到 HER 和 OER 10 mA cm−2 的电流密度。该电极还表现出低塔菲尔斜率和优异的稳定性。此外，用于整体水分解的双功能催化剂可以在 10 mA cm−2 下表现出 1.6 V 的电池电压，以及 24 小时测试的出色耐久性。这项工作为设计用于整体水分解的有效双功能催化剂提供了一种新策略。
Designing high-efficiency and low-cost bifunctional electrocatalysts for both the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is of great significance to produce hydrogen by water electrolysis. Herein, a hierarchical FeCo2S4@CoFe layered double hydroxide (LDH) core–shell structure catalyst was successfully fabricated via a hydrothermal–sulfuration–electrodeposition three-step method. The unique structure can provide more abundant catalytically active sites for the electrochemical reaction. The resulting FeCo2S4@CoFe LDH electrode only requires overpotentials of 115 and 247 mV to reach a current density of 10 mA cm−2 for the HER and OER in 1 M KOH electrolyte, respectively. The electrode also exhibits a low Tafel slope and excellent stability. Furthermore, the bifunctional catalyst for overall water splitting can exhibit a cell voltage of 1.6 V at 10 mA cm−2, along with outstanding durability for 24 h testing. This work provides a new strategy to design effective bifunctional catalysts for overall water splitting.