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首页> 外文期刊>Nanotechnology >Noble-metal-free tungsten oxide/carbon (WOx/C) hybrid manowires for highly efficient hydrogen evolution
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Noble-metal-free tungsten oxide/carbon (WOx/C) hybrid manowires for highly efficient hydrogen evolution

机译：无金属无金属氧化钨/碳（WOX / C）杂种部件用于高效氢气进化

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摘要

Developing active, stable, and low-cost electrocatalysts to generate hydrogen is a great challenge in the fields of chemistry and energy. Nonprecious metal catalysts comprised of inexpensive and earth-abundant transition metals are regarded as a promising substitute for noble metal catalysts used in hydrogen evolution reaction (HER), but are still practically unfeasible mainly due to unsatisfactory activity and durability. Here we report a facile two-step preparation method for WOx nanowires with high concentration of oxygen vacancies (OVs) via calcination of W-polydopamine compound precursors. The resulting hybrid material possesses a uniform and ultralong 1D nanowires structure and a rough and raised surface, which can effectively improve the specific surface area. The products exhibit excellent performance for H-2 generation: the required overpotentials for 1 and 10 mA cm(-2) are 18 and 108 mV, the Tafel slope is 46 mV/decade, and the electrochemically active surface area is estimated to be similar to 77.0 m(2) g(-1). After 1000 cycles, the catalyst works well without significant current density drop. Our experimental results verified metallic transition metal oxides as superior non-Pt electrocatalysts for practical hydrogen evolution reactions.
机译：发育活性，稳定和低成本的电催化剂，以产生氢是化学和能量领域的巨大挑战。由廉价的金属催化剂包含廉价的和富力的过渡金属被认为是氢气进化反应（她）中使用的贵金属催化剂的有望替代品，但仍然几乎是由于不令人满意的活性和耐用性而不可行。在这里，我们通过煅烧W-聚二胺化合物前体煅烧具有高浓度氧空位（OVS）的Wox纳米线的容易两步制备方法。所得到的混合材料具有均匀，超声1D纳米线结构和粗糙和凸起的表面，可以有效地改善特定表面积。该产品表现出优异的H-2生成性能：1和10 mA cm（-2）的所需的过电势为18和108 mV，Tafel斜率为46 mV /十年，并且估计电化学活性表面积为类似到77.0 m（2）g（-1）。在1000次循环之后，催化剂在没有显着电流密度下降的情况下运行良好。我们的实验结果已验证金属过渡金属氧化物作为实际氢化反应的优质非Pt电催化剂。

著录项

  • 来源
    《Nanotechnology》 |2017年第44期|共9页
  • 作者

    Liu Changhai; Qiu Yangyang; Xia Yujian; Wang Fang; Liu Xiaocun; Sun Xuhui; Liang Qian; Chen Zhidong;

  • 作者单位

    Changzhou Univ Jiangsu Collaborat Innovat Ctr Photovolta Sci &

    E Sch Mat Sci &

    Engn Changzhou 213164 Jiangsu Peoples R China;

    Changzhou Univ Jiangsu Collaborat Innovat Ctr Photovolta Sci &

    E Sch Mat Sci &

    Engn Changzhou 213164 Jiangsu Peoples R China;

    Soochow Univ Inst Funct Nano &

    Soft Mat FUNSOM Suzhou 215123 Jiangsu Peoples R China;

    Changzhou Univ Jiangsu Collaborat Innovat Ctr Photovolta Sci &

    E Sch Mat Sci &

    Engn Changzhou 213164 Jiangsu Peoples R China;

    Changzhou Univ Jiangsu Collaborat Innovat Ctr Photovolta Sci &

    E Sch Mat Sci &

    Engn Changzhou 213164 Jiangsu Peoples R China;

    Soochow Univ Inst Funct Nano &

    Soft Mat FUNSOM Suzhou 215123 Jiangsu Peoples R China;

    Changzhou Univ Sch Petrochem Engn Changzhou 213164 Peoples R China;

    Changzhou Univ Jiangsu Collaborat Innovat Ctr Photovolta Sci &

    E Sch Mat Sci &

    Engn Changzhou 213164 Jiangsu Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 特种结构材料;
  • 关键词

    hydrogen evolution reaction; metallic transition metal oxides; oxygen vacancies; electronic structure; x-ray absorption near edge structure;

    机译：氢气进化反应;金属过渡金属氧化物;氧空位;电子结构;边缘结构附近的X射线吸收;

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