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Nickel–vanadium monolayer double hydroxide for efficient electrochemical water oxidation

2016; Nature Portfolio; Volume: 7; Issue: 1 Linguagem: Inglês

10.1038/ncomms11981

2041-1723

Ke Fan, Hong Chen, Yongfei Ji, Hui Huang, Per M. Claesson, Quentin Daniel, Bertrand Philippe, Håkan Rensmo, Fusheng Li, Yi Luo, Licheng Sun,

Advanced Photocatalysis Techniques

Abstract Highly active and low-cost electrocatalysts for water oxidation are required due to the demands on sustainable solar fuels; however, developing highly efficient catalysts to meet industrial requirements remains a challenge. Herein, we report a monolayer of nickel–vanadium-layered double hydroxide that shows a current density of 27 mA cm −2 (57 mA cm −2 after ohmic-drop correction) at an overpotential of 350 mV for water oxidation. Such performance is comparable to those of the best-performing nickel–iron-layered double hydroxides for water oxidation in alkaline media. Mechanistic studies indicate that the nickel–vanadium-layered double hydroxides can provide high intrinsic catalytic activity, mainly due to enhanced conductivity, facile electron transfer and abundant active sites. This work may expand the scope of cost-effective electrocatalysts for water splitting.