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Construction of Ni3S4-CeO2 nanocomposites for enhanced electrocatalytic alkaline oxygen evolution reactions
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DOI：10.1039/D5CY01006C.png)
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Abstract
En 中文
Water electrolysis is an important way to achieve sustainable hydrogen production. However; the sluggish kinetics of the anodic oxygen evolution reaction (OER) brings about high energy consumption and low efficiency of the electrolysis process; which greatly limits its application. In this work; Ni3S4-CeO2/NF electrocatalysts were prepared on nickel foam by secondary calcination and simple hydrothermal synthesis. The Ni3S4-CeO2/NF catalysts exhibit outstanding electrochemical alkaline OER performance and durability. Among them; the optimized Ni3S4-CeO2/NF catalyst requires only 110 mV overpotential to reach a current density of 10 mA cm−2; with a Tafel slope of 42.3 mV dec−1 in 1 M KOH. Furthermore; the current density of the Ni3S4-CeO2/NF catalyst is stable over 20 hours; showing good catalytic stability. Studies have shown that the improved OER performance is due to CeO2 accelerating charge transfer and adjusting the electronic structure of Ni3S4. This work provided a new strategy for constructing high activity alkaline OER electrocatalysts.
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