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Hierarchical FeCo2S4@CoFe layered double hydroxide on Ni foam as a bifunctional electrocatalyst for overall water splitting

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Abstract

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.

Graphical abstract: Hierarchical FeCo2S4@CoFe layered double hydroxide on Ni foam as a bifunctional electrocatalyst for overall water splitting

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Article information


Submitted
19 Sep 2019
Accepted
08 Jan 2020
First published
08 Jan 2020

Catal. Sci. Technol., 2020, Advance Article
Article type
Paper

Hierarchical FeCo2S4@CoFe layered double hydroxide on Ni foam as a bifunctional electrocatalyst for overall water splitting

Y. Huang, X. Chen, S. Ge, Q. Zhang, X. Zhang, W. Li and Y. Cui, Catal. Sci. Technol., 2020, Advance Article , DOI: 10.1039/C9CY01896D

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