Issue 5, 2020

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

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

Supplementary files

Article information

Article type
Paper
Submitted
19 sep 2019
Accepted
08 jan 2020
First published
08 jan 2020

Catal. Sci. Technol., 2020,10, 1292-1298

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, 10, 1292 DOI: 10.1039/C9CY01896D

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