Department of Chemistry, Organic Chemistry, KTH Royal Institute of Technology, 10044 Stockholm, Sweden.
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China.
Nat Commun. 2016 Jun 16;7:11981. doi: 10.1038/ncomms11981.
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.
由于对可持续太阳能燃料的需求，需要高效且低成本的电催化剂用于水氧化；然而，开发满足工业需求的高效催化剂仍然是一个挑战。在此，我们报告了一种镍-钒层状双氢氧化物的单层，在 350 mV 的过电势下，其水氧化的电流密度为 27 mA cm(-2)（欧姆降修正后为 57 mA cm(-2)）。这种性能可与碱性介质中性能最佳的镍-铁层状双氢氧化物的水氧化性能相媲美。机理研究表明，镍-钒层状双氢氧化物具有较高的本征催化活性，主要归因于增强的导电性、易于电子转移和丰富的活性位点。这项工作可能会扩大用于水分解的具有成本效益的电催化剂的范围。
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