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- W2965580108 abstract "Development of efficient and noble metal-free catalysts for oxygen evolution reaction (OER) is of great importance for practical energy-related technologies. Herein, one-step hydrothermal method is developed for the synthesis of a series of nickel selenides (NiSe₂, NiSe, and Ni₃Se₂) and their multiwalled carbon nanotubes (MWCNTs) nanocomposites as electrocatalysts for OER. Among the NiSe₂, NiSe, and Ni₃Se₂ catalysts, NiSe shows the highest activity, exhibiting an overpotential of 389 mV to achieve 10 mA/cm² and a Tafel slope of 93 mV/dec in 1 M KOH. We further report a facile preparation of nickel selenides nanocrystals (particle size of ∼10 nm) grown on MWCNTs. The NiSe/MWCNTs nanocomposite shows improved activity toward OER, with an overpotential of 336 mV to reach 10 mA/cm² and a Tafel slope of 78 mV/dec, which is close to the state-of-the-art RuO₂ catalyst. The addition of MWCNTs during the synthesis not only introduces an abundance of nucleation sites, resulting in small particle sizes of NiSe crystals, but also improves the dispersion of NiSe nanoparticles. The small particle size and good dispersion of NiSe nanoparticles are beneficial to providing abundant active catalytic sites. In addition, the porous and conductive MWCNTs facilitate the electronic transmission and the electrolyte penetration. Furthermore, NiSe/MWCNTs nanocomposite also exhibits good long-term stability." @default.
- W2965580108 created "2019-08-13" @default.
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- W2965580108 date "2018-01-01" @default.
- W2965580108 modified "2023-09-27" @default.
- W2965580108 title "Control Synthesis of Nickel Selenides and Their Multiwalled Carbon Nanotubes Composites as Electrocatalysts for Enhanced Water Oxidation" @default.
- W2965580108 hasPublicationYear "2018" @default.
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