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首页> 外文期刊>Advanced Materials >Exceptional Performance of Hierarchical Ni-Fe (hydr) oxide@NiCu Electrocatalysts for Water Splitting
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Exceptional Performance of Hierarchical Ni-Fe (hydr) oxide@NiCu Electrocatalysts for Water Splitting

机译：分层Ni-Fe（水）氧化物@NiCu电催化剂在水分解中的优异性能

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摘要

Developing low-cost bifunctional electrocatalysts with superior activity for both the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) is of great importance for the widespread application of the water splitting technique. In this work, using earth-abundant transition metals (i.e., nickel, iron, and copper), 3D hierarchical nanoarchitectures, consisting of ultrathin Ni-Fe layered-double-hydroxide (Ni-Fe LDH) nanosheets or porous Ni-Fe oxides (NiFeOx) assembled to a metallic NiCu alloy, are delicately constructed. In alkaline solution, the as-prepared Ni-Fe LDH@NiCu possesses outstanding OER activity, achieving a current density of 10 mA cm(-2) at an overpotential of 218 mV, which is smaller than that of RuO2 catalyst (249 mV). In contrast, the resulting NiFeOx@NiCu exhibits better HER activity, yielding a current density of 10 mA cm(-2) at an overpotential of 66 mV, which is slightly higher than that of Pt catalyst (53 mV) but superior to all other transition metal (hydr)oxide-based electrocatalysts. The remarkable activity of the Ni-Fe LDH@NiCu and NiFeOx@NiCu is further demonstrated by a 1.5 V solar-panel-powered electrolyzer, resulting in current densities of 10 and 50 mA cm(-2) at overpotentials of 293 and 506 mV, respectively. Such performance renders the as-prepared materials as the best bifunctional electrocatalysts so far.
机译：开发出对氧分解反应（OER）和氢分解反应（HER）均具有优异活性的低成本双功能电催化剂，对于水分解技术的广泛应用具有重要意义。在这项工作中，使用富含地球的过渡金属（例如，镍，铁和铜），3D分层纳米结构，该结构由超薄的镍铁层状双氢氧化物（Ni-Fe LDH）纳米片或多孔的Ni-Fe氧化物（ NiFeOx）组装成金属NiCu合金，结构精美。在碱性溶液中，制备的Ni-Fe LDH @ NiCu具有出色的OER活性，在218 mV的过电势下实现了10 mA cm（-2）的电流密度，这比RuO2催化剂（249 mV）小。相比之下，所得的NiFeOx @ NiCu具有更好的HER活性，在66 mV的过电势下产生10 mA cm（-2）的电流密度，该电流密度略高于Pt催化剂（53 mV），但优于其他所有催化剂过渡金属（氢）氧化物基电催化剂。 1.5 V太阳能电池板供电的电解槽进一步证明了Ni-Fe LDH @ NiCu和NiFeOx @ NiCu的卓越活性，在293和506 mV的超电势下产生10和50 mA cm（-2）的电流密度， 分别。这样的性能使所制备的材料成为迄今为止最好的双功能电催化剂。

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  • 来源
    《Advanced Materials》 |2019年第8期|1806769.1-1806769.8|共8页
  • 作者

    Zhou Yongfang; Wang Zixu; Pan Ziyan; Liu Le; Xi Jingyu; Luo Xuanli; Shen Yi;

  • 作者单位

    South China Univ Technol, Sch Food Sci & Engn, Guangzhou 510640, Guangdong, Peoples R China;

    South China Univ Technol, Sch Food Sci & Engn, Guangzhou 510640, Guangdong, Peoples R China;

    South China Univ Technol, Sch Food Sci & Engn, Guangzhou 510640, Guangdong, Peoples R China;

    Tsinghua Univ, Grad Sch Shenzhen, Inst Green Chem & Energy, Shenzhen 518055, Peoples R China;

    Tsinghua Univ, Grad Sch Shenzhen, Inst Green Chem & Energy, Shenzhen 518055, Peoples R China;

    Univ Nottingham, Fac Engn, Adv Mat Res Grp, Nottingham NG7 2RD, England;

    South China Univ Technol, Sch Food Sci & Engn, Guangzhou 510640, Guangdong, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    hydrogen evolution reaction; layered double hydroxides and porous Ni-Fe oxides; oxygen evolution reaction; water splitting;

    机译：析氢反应;层状双氢氧化物和多孔镍铁氧化物;析氧反应;水分解;

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