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• W3157706752 endingPage "149985" @default.
• W3157706752 startingPage "149985" @default.
• W3157706752 abstract "Ni 3 S 4 /NiS 2 /FeS 2 nanoparticles exhibited the outstanding overall water splitting activity in alkaline media due to the presence of interfacial structures between Ni-S and Fe-S. • Ni 3 S 4 /NiS 2 /FeS 2 nanoparticles are constructed by a facile hydrothermal method. • Ni 3 S 4 /NiS 2 /FeS 2 nanoparticles expose the interfacial structures. • Ni 3 S 4 /NiS 2 /FeS 2 nanoparticles show the outstanding overall water splitting activity. • Interfacial structures between Ni-S and Fe-S are accounting for the high activity. Construction of bi-functional noble metal-free catalysts with low cost and high efficiency is greatly desired for hydrogen and oxygen evolution reactions. It is of vital importance to regulate the surface electron state of pyrite to improve the electrocatalytic performance towards overall water splitting. In this work, we provide a simple one-pot interface-regulated strategy to synthesize Ni 3 S 4 /NiS 2 /FeS 2 nanoparticles with exposed interfacial structures between Ni-S and Fe-S, which can then affect the conductivity and activity of pyrite. Notably, Ni 3 S 4 /NiS 2 /FeS 2 nanoparticles are highly active in the hydrogen evolution reaction with 197 mV at 10 mA/cm 2 . Superior oxygen evolution activity is observed for Ni 3 S 4 /NiS 2 /FeS 2 nanoparticles with 1.46 V at 10 mA/cm 2 , outperforming RuO 2 with 1.54 V. Impressively, Ni 3 S 4 /NiS 2 /FeS 2 nanoparticles could efficiently drive water splitting into hydrogen and oxygen at a voltage of 1.68 V at 10 mA/cm 2 in a two-electrode configuration and robust long-term stability was verified by continuous 20 h i-t tests without apparent loss in the current density. The outstanding catalytic activity could be traced back to the presence of interfacial structures between Ni-S and Fe-S. This work highlights that engineering heteroatoms into pyrite that can trigger the generation of interfacial structures, which beneficially accelerates electron transfer during the water splitting process." @default.
• W3157706752 created "2021-05-10" @default.
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• W3157706752 date "2021-09-01" @default.
• W3157706752 modified "2023-10-17" @default.
• W3157706752 title "Synthesis of Ni3S4/NiS2/FeS2 nanoparticles for hydrogen and oxygen evolution reaction" @default.
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• W3157706752 doi "https://doi.org/10.1016/j.apsusc.2021.149985" @default.
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