Nickel-vanadium monolayer double hydroxide for efficient electrochemical water oxidation.
Nickel-vanadium monolayer double hydroxide for efficient electrochemical water oxidation.
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DOI：
10.1038/ncomms11981
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发表时间：
2016-06-16
影响因子：
16.6
通讯作者：
Sun L
中科院分区：
文献类型：
--
作者：
Fan K;Chen H;Ji Y;Huang H;Claesson PM;Daniel Q;Philippe B;Rensmo H;Li F;Luo Y;Sun L
由于对可持续太阳能燃料的需求，需要用于水氧化的高活性和低成本的电催化剂;然而，开发满足工业要求的高效催化剂仍然是一个挑战。在此，我们报告了一种单层镍钒层状双氢氧化物，其在350 mV的水氧化过电位下显示出27 mA cm −2的电流密度（欧姆降校正后为57 mA cm−2）。这种性能与碱性介质中用于水氧化的性能最好的镍铁层状双氢氧化物的性能相当。机理研究表明，镍钒水滑石具有较高的催化活性，主要是由于其导电性增强、电子转移容易和活性中心丰富。这项工作可能会扩大水分解的成本效益的电催化剂的范围。 水氧化是水裂解的关键组成部分，但仍需要更有效的催化剂。在这里，作者合成了单层镍钒层状双氢氧化物材料，由于增强的导电性和丰富的活性中心，显示出高的水氧化活性。
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. Water oxidation is a key component of water splitting, but more effective catalysts for the process are still required. Here the authors synthesize a monolayer nickel-vanadium layered double hydroxide material showing high activity for water oxidation owing to enhanced conductivity and abundant active sites.