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首页> 外文期刊>Advanced Functional Materials >Ultrasmall Dispersible Crystalline Nickel Oxide Nanoparticles as High-Performance Catalysts for Electrochemical Water Splitting
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Ultrasmall Dispersible Crystalline Nickel Oxide Nanoparticles as High-Performance Catalysts for Electrochemical Water Splitting

机译：超小型可分散结晶性氧化镍纳米粒子作为电化学水分解的高性能催化剂

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摘要

Ultrasmall, crystalline, and dispersible NiO nanoparticles are prepared for the first time, and it is shown that they are promising candidates as catalysts for electrochemical water oxidation. Using a solvothermal reaction in tert-butanol, very small nickel oxide nanocrystals can be made with sizes tunable from 2.5 to 5 nm and a narrow particle size distribution. The crystals are perfectly dispersible in ethanol even after drying, giving stable transparent colloidal dispersions. The structure of the nanocrystals corresponds to phase-pure stoichiometric nickel(Ⅱ) oxide with a partially oxidized surface exhibiting Ni(Ⅲ) states. The 3.3 nm nanoparticles demonstrate a remarkably high turn-over frequency of 0.29 s~(-1) at an overpotentiai of γ= 300 mV for electrochemical water oxidation, outperforming even expensive rare earth iridium oxide catalysts. The unique features of these NiO nanocrystals provide great potential for the preparation of novel composite materials with applications in the field of (photo)electrochemical water splitting. The dispersed colloidal solutions may also find other applications, such as the preparation of uniform hole-conducting layers for organic solar cells.
机译：首次制备了超小，结晶且可分散的NiO纳米颗粒，结果表明它们有望用作电化学水氧化的催化剂。使用在叔丁醇中的溶剂热反应，可以制得非常小的氧化镍纳米晶体，其尺寸可调节为2.5至5 nm，并且粒径分布窄。即使干燥后，晶体也可完美地分散在乙醇中，从而获得稳定的透明胶体分散体。纳米晶体的结构对应于具有部分氧化的表面的Ni（Ⅲ）态的纯相化学计量的镍（Ⅱ）氧化物。 3.3 nm纳米颗粒在γ= 300 mV的过电位下表现出0.29 s〜（-1）的极高翻转频率，用于电化学水氧化，甚至优于昂贵的稀土铱氧化物催化剂。这些NiO纳米晶体的独特特征为在（光）电化学水分解领域中的应用提供了制备新型复合材料的巨大潜力。分散的胶体溶液还可以找到其他应用，例如制备用于有机太阳能电池的均匀的空穴传导层。

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  • 来源
    《Advanced Functional Materials》 |2014年第21期|3123-3129|共7页
  • 作者

    Ksenia Fominykh; Johann M. Feckl; Johannes Sicklinger; Markus Doeblinger; Sebastian Boecklein; Juergen Ziegler; Laurence Peter; Jiri Rathousky; Ernst-Wilhelm Scheldt; Thomas Bein; Dina Fattakhova-Rohlfing;

  • 作者单位

    University of Munich (LMU) and Center for NanoScience (CeNS) Butenandtstrasse 5-13 (E), 81377, Munich, Germany;

    University of Munich (LMU) and Center for NanoScience (CeNS) Butenandtstrasse 5-13 (E), 81377, Munich, Germany;

    University of Munich (LMU) and Center for NanoScience (CeNS) Butenandtstrasse 5-13 (E), 81377, Munich, Germany;

    University of Munich (LMU) and Center for NanoScience (CeNS) Butenandtstrasse 5-13 (E), 81377, Munich, Germany;

    University of Munich (LMU) and Center for NanoScience (CeNS) Butenandtstrasse 5-13 (E), 81377, Munich, Germany;

    Institute of Materials Science Jovanka-Bontschits-Str. 2, 64287, Darmstadt, Germany;

    Department of Chemistry University of Bath BA2 7AY, Bath, UK;

    J. Heyrovsky Institute of Physical Chemistry, v.v.i. Academy of Sciences of the Czech Republic Dolejskova 3, 18223, Prague 8, Czech Republic;

    Department of Physics Augsburg University 86159, Augsburg, Germany;

    University of Munich (LMU) and Center for NanoScience (CeNS) Butenandtstrasse 5-13 (E), 81377, Munich, Germany;

    University of Munich (LMU) and Center for NanoScience (CeNS) Butenandtstrasse 5-13 (E), 81377, Munich, Germany;

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