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首页> 外文期刊>Advanced energy materials >From Water Oxidation to Reduction: Homologous Ni–Co Based Nanowires as Complementary Water Splitting Electrocatalysts
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From Water Oxidation to Reduction: Homologous Ni–Co Based Nanowires as Complementary Water Splitting Electrocatalysts

机译：从水氧化到还原：同源的镍钴基纳米线作为辅助的水分解电催化剂

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摘要

A homologous Ni–Co based nanowire system, consisting of both nickel cobalt oxide and nickel cobalt sulfide nanowires, is developed for efficient, complementary water splitting. The spinel-type nickel cobalt oxide (NiCo2O4) nanowires are hydrothermally synthesized and can serve as an excellent oxygen evolution reaction catalyst. Subsequent sulfurization of the NiCo2O4 nanowires leads to the formation of pyrite-type nickel cobalt sulfide (Ni0.33Co0.67S2) nanowires. Due to the 1D nanowire morphology and enhanced charge transport capability, the Ni0.33Co0.67S2 nanowires function as an efficient, stable, and robust nonnoble metal electrocatalyst for hydrogen evolution reaction (HER), substantially exceeding CoS2 or NiS2 nanostructures synthesized under similar methods. The Ni0.33Co0.67S2 nanowires exhibit low onset potential of −65, −39, and −50 mV versus reversible hydrogen electrode, Tafel slopes of 44, 68, and 118 mV dec−1 at acidic, neutral, and basic conditions, respectively, and excellent stability, comparable to the best reported non-noble metal-based HER catalysts. Furthermore, the homologous Ni0.33Co0.67S2 nanowires and NiCo2O4 nanowires are assembled into an all-nanowire based water splitting electrolyzer with a current density of 5 mA cm−2 at a voltage as 1.65 V, thus suggesting a unique homologous, earth abundant material system for water splitting.
机译：一种基于镍钴的同源纳米线系统，包括氧化镍钴和硫化镍钴纳米线，可实现高效的补充水分解。尖晶石型氧化镍钴（NiCo2O4）纳米线是水热合成的，可以用作优良的析氧反应催化剂。 NiCo2O4纳米线的随后硫化导致形成黄铁矿型硫化镍钴（Ni0.33Co0.67S2）纳米线。由于一维纳米线的形貌和增强的电荷传输能力，Ni0.33Co0.67S2纳米线可作为一种高效，稳定和坚固的非贵金属电催化剂用于氢释放反应（HER），大大超过了通过类似方法合成的CoS2或NiS2纳米结构。与可逆氢电极相比，Ni0.33Co0.67S2纳米线的起始电位低，分别为-65，-39和-50 mV，在酸性，中性和碱性条件下的Tafel斜率分别为44,68和118 mV dec-1。与出色的稳定性相媲美，据报道报道的基于非贵金属的HER催化剂。此外，将同源的Ni0.33Co0.67S2纳米线和NiCo2O4纳米线组装成全纳米线的水分解电解槽，在1.65 V的电压下电流密度为5 mA cm-2，因此表明是独特的同源，富含地球的材料分水系统。

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  • 来源
    《Advanced energy materials》 |2015年第9期|1-7|共7页
  • 作者

    Zheng Peng; Dingsi Jia; Abdullah M. Al-Enizi; Ahmed A. Elzatahry; Gengfeng Zheng;

  • 作者单位

    Laboratory of Advanced Materials Department of Chemistry Collaborative Innovation Center for Energy Materials Fudan University Shanghai China;

    Laboratory of Advanced Materials Department of Chemistry Collaborative Innovation Center for Energy Materials Fudan University Shanghai China;

    Department of Chemistry College of Science King Saud University Riyadh Saudi Arabia;

    Materials Science and Technology Program College of Arts and Sciences Qatar University Doha Qatar;

    Laboratory of Advanced Materials Department of Chemistry Collaborative Innovation Center for Energy Materials Fudan University Shanghai China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    electrocatalysts; hydrogen evolution reaction; nanowires; oxygen evolution reaction; water splitting;

    机译：电催化剂;析氢反应;纳米线;析氧反应;水分解;

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