Rational introduction of S and P in multi-stage electrocatalyst to drive a large-current-density water oxidation reaction and overall water splitting
Journal of Power Sources(2022)
摘要
Rational design and construction of electrocatalysts that can work well at large current densities are imperative for water splitting. Herein, a multi-stage P–Ni3S2/NiFe/NF electrocatalyst was rationally designed by introducing heteroatoms (S and P) and heterostructure construction. Benefitting from the optimized electronic structure configuration by the synergistic incorporation of S and P, the as-prepared P–Ni3S2/NiFe/NF electrocatalyst exhibits remarkable activity and stability towards oxygen evolution reaction (OER) in alkaline media, yielding ultralow overpotentials of 250 mV and 372 mV at the current densities of 100 mA/cm2 and 1000 mA/cm2, respectively. Moreover, its multi-stage heterostructure also endows the electrocatalyst with unique multifunctional properties, making it can realize overall water splitting under a low cell voltage of 1.57 V at 10 mA/cm2, and has long-term stability. This work demonstrates the importance of rational introduction of heteroatoms and interface/surface engineering for advanced electrocatalytic materials.
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关键词
Water splitting,Oxygen evolution reaction,Large-current-density,Heteroatom doping,Heterostructure
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