期刊
CATALYSIS SCIENCE & TECHNOLOGY
卷 10, 期 5, 页码 1292-1298出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9cy01896d
关键词
-
资金
- National Natural Science Foundation of China [51571006, 51971025]
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.
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