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首页> 外文期刊>Catalysis science & technology >Enhanced activity of H2O2-treated copper(II) oxide nanostructures for the electrochemical evolution of oxygen
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Enhanced activity of H2O2-treated copper(II) oxide nanostructures for the electrochemical evolution of oxygen

机译：增强氧化H2O2-treated铜(II)的活性纳米结构电化学的进化的氧气

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摘要

The successful design and synthesis of earth-abundant and efficient catalysts for the oxygen evolution reaction (OER) will be a major step forward towards the use of electrochemical water splitting as an environmentally-friendly process for producing H-2 fuel. Due to their poor activity, copper-based materials have not been considered apt for catalysing OER. In this work, we demonstrate that unique copper(II) oxide nanostructures obtained via hydrothermal synthesis and subsequent hydrogen peroxide treatment exhibit unusually high and sustainable OER activity. In 0.1 M KOH electrolyte, the CuO nanostructures catalyse OER with current densities of 2.6-3.4 mA cm(-2) at 1.75 V (vs. RHE). The calculated turnover frequency (per Cu site) of similar to 2 x 10(-3) s(-1) for O-2 production is markedly higher than that of high-surface area electrodeposited Cu metal nanoparticles by 40-68 times. The OER activity of the CuO nanostructures is also stable, approaching about half of 20% IrOx/Vulcan XC-72 after an hour-long OER. In situ Raman spectroscopy at OER-relevant potentials recorded compelling evidence that Cu-III active species may be responsible for the unusual OER activity of the CuO nanostructures, as indicated by its signature vibration at 603 cm(-1). This hitherto unobserved peak is assigned, with the aid of the model compound (NaCuO2)-O-III, to the Cu-O stretching vibration of Cu-III oxide. This feature was not found on electrodeposited Cu metal, which exhibited correspondingly weaker OER activity. The enhanced catalysis of O-2 evolution by the CuO nanostructures is thus attributed to not just their higher surface area, but also the higher population of Cu-III active sites on their surface.
机译：成功的设计和合成地球上充足的、高效的催化剂氧气反应(OER)将是一个重大的进化一步对电化学的使用作为一个环保水分离生产氢燃料的过程。没有活动,含铜材料为促进OER认为是恰当的。我们表明,独特的铜(II)氧化物通过水热而获得的纳米结构合成和随后的过氧化氢治疗具有异常高的和可持续的在活动。纳米结构催化OER和电流马的密度2.6 - -3.4厘米(2)在1.75 V (vs。流值)。类似的网站)2 x 10 0 2 (3) (1)产量明显高于高表面电镀铜金属纳米粒子由40 - 68次。措纳米结构也是稳定的,接近一半的IrOx /火神xc - 72的20%后一个小时以上。光谱学在OER-relevant电位记录令人信服的证据表明Cu-III活跃的物种负责不同寻常的OER活动吗措的纳米结构,用其表示签名在603厘米(1)振动。未被注意的分配,与援助的模型化合物(NaCuO2) -O-III Cu-O伸缩振动Cu-III氧化物。功能不存在电镀铜金属,相应地弱OER展出活动。措纳米结构因此归因于不仅是他们的更高的表面积,但也高人口Cu-III活跃的网站上表面。

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