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Effects of morphology and exposed facets of alpha-Fe2O3 nanocrystals on photocatalytic water oxidation

机译：α-Fe2O3纳米晶体形态和暴露刻面对光催化水氧化的影响

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摘要

Shape and facet engineering of crystals at the nanoscale level has become an important strategy for optimizing the reactivity of catalysts in heterogeneous catalysis. We report here the fabrication of four morphology-controlled alpha-Fe2O3 catalysts with exposed specific facets by a solvothermal method. The effects of morphology and exposed facets of these alpha-Fe2O3 nanocrystals towards visible light-driven water oxidation have been investigated. Water oxidation was carried out using two catalytic systems, Fe2O3/[Ru(bpy)(3)](2+)/S2O82- and Fe2O3/AgNO3, at lambda > 420 nm. The alpha-Fe2O3 nanocubes with exposed {012} facets exhibit much higher catalytic activity than alpha-Fe2O3 nanoflakes with {001} facets. This work demonstrates that the catalytic activity of alpha-Fe2O3 nanocrystals in photocatalytic water oxidation is morphology-dependent and the reactivity trend can be rationalized in terms of exposed facets in the order of {012} > {001}. This study provides a new approach to the design of highly effective water oxidation catalysts by engineering the morphology and the exposed facets of crystals.
机译：纳米级水平晶体的形状和刻面工程已成为优化异质催化剂中催化剂反应性的重要策略。我们在此报告通过溶剂热法制造具有暴露的特异性刻面的四种形态控制的α-Fe2O3催化剂。已经研究了这些α-Fe2O3纳米晶体对可见光水氧化的形态和暴露的突出的影响。使用两种催化系统，Fe2O3 / [Ru（3）]（2 +）/ S2O82-和Fe 2 O 3 / AgNO3，在Lambda> 420nm下进行水氧化。具有暴露的{012}外分的α-Fe2O3纳米孔表现出比α-Fe2O3纳米薄膜具有更高的催化活性，具有{001}小平面。该工作表明，光催化水氧化中的α-Fe2O3纳米晶体的催化活性依赖于形态学，并且可以根据{012} {001}的顺序在暴露的刻面方面合理化反应性趋势。该研究通过工程形态和晶体的晶体设计了一种新的高效水氧化催化剂的设计方法。

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  • 来源
    《RSC Advances》 |2015年第64期|共7页
  • 作者

    Xiang Quanjun; Chen Gui; Lau Tai-Chu;

  • 作者单位

    City Univ Hong Kong Dept Biol &

    Chem Kowloon Tong Hong Kong Peoples R China;

    City Univ Hong Kong Dept Biol &

    Chem Kowloon Tong Hong Kong Peoples R China;

    City Univ Hong Kong Dept Biol &

    Chem Kowloon Tong Hong Kong Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
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