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Phase-Separated Mo–Ni Alloy for Hydrogen Oxidation and Evolution Reactions with High Activity and Enhanced Stability

机译：用于氢氧化的相分离的MO-Ni合金，具有高活性和增强稳定性的进化反应

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摘要

The development of alkaline polymer electrolyte fuel cells and alkaline water electrolysis requires nonprecious metal catalysts for the hydrogen oxidation reaction (HOR) and hydrogen evolution reaction (HER). Herein, it is reported a phase-separated Mo-Ni alloy (PS-MoNi) that is composed of Mo metal and embedded Ni metal nanoparticles. The PS-MoNi shows excellent hydrogen electrode activity with a high exchange current density (-4.883 mA cm(-2)), which is comparable to the reported highest value for non-noble catalysts. Moreover, the amorphous phase-separated Mo-Ni alloy has better structural and electrochemical stability than the intermetallic compound Mo-Ni alloy (IC-MoNi). The breakdown potential of PS-MoNi is as high as 0.32 V, which is much higher than that of reported IC-MoNi. The X-ray absorption near edge structure (XANES) and density functional theory (DFT) calculations indicate the electrons transfer from Mo to Ni for PS-MoNi, leading to suitable adsorption free energies of H* (Delta G(H*)) on the surface of Mo. This means that the electron density modulation of Mo metal by embedded Ni metal nanoparticles can produce excellent HOR and HER performance.
机译：碱性聚合物电解质燃料电池和碱性水电解的发展需要用于氢氧化反应（HOR）和氢进化反应（她）的非常见金属催化剂。在此，据报道，由Mo金属和嵌入式Ni金属纳米颗粒组成的相分离的Mo-Ni合金（PS-Moni）。 PS-Moni显示出具有高交换电流密度（-4.883mAcm（-2））的优异的氢电极活性，其与报告的非惰性催化剂的最高值相当。此外，无定形相分离的MO-Ni合金具有比金属间化合物Mo-Ni合金（IC-Moni）更好的结构和电化学稳定性。 PS-Moni的分解电位高达0.32 V，远高于报告的IC-Moni。近边缘结构（XANES）和密度泛函理论（DFT）计算附近的X射线吸收表明，从MO到NI的电子转移PS-Moni，导致H *（Delta G（H *））的吸附能量。 MO的表面意味着通过嵌入Ni金属纳米颗粒的Mo金属的电子密度调节可以产生优异的HOR和她的性能。

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  • 来源
    《Advanced energy materials》 |2021年第16期|2003511.1-2003511.7|共7页
  • 作者

    Song Jidong; Jin Yan Qi; Zhang Lei; Dong Pengyu; Li Jiawang; Xie Fangyan; Zhang Hao; Chen Jian; Jin Yanshuo; Meng Hui; Sun Xueliang;

  • 作者单位

    Jinan Univ Guangdong Prov Key Lab Opt Fiber Sensing & Commun Siyuan Lab Guangdong Prov Engn Technol Res Ctr Va Guangzhou Key Lab Vacuum Coating Technol & New En Guangzhou 510632 Guangdong Peoples R China;

    Jinan Univ Guangdong Prov Key Lab Opt Fiber Sensing & Commun Siyuan Lab Guangdong Prov Engn Technol Res Ctr Va Guangzhou Key Lab Vacuum Coating Technol & New En Guangzhou 510632 Guangdong Peoples R China;

    Univ Western Ontario Dept Mech & Mat Engn London ON N6A 5B9 Canada;

    Jinan Univ Guangdong Prov Key Lab Opt Fiber Sensing & Commun Siyuan Lab Guangdong Prov Engn Technol Res Ctr Va Guangzhou Key Lab Vacuum Coating Technol & New En Guangzhou 510632 Guangdong Peoples R China;

    Jinan Univ Guangdong Prov Key Lab Opt Fiber Sensing & Commun Siyuan Lab Guangdong Prov Engn Technol Res Ctr Va Guangzhou Key Lab Vacuum Coating Technol & New En Guangzhou 510632 Guangdong Peoples R China;

    Sun Yat Sen Univ Instrumental Anal & Res Ctr Guangzhou 510275 Guangdong Peoples R China;

    Sun Yat Sen Univ Instrumental Anal & Res Ctr Guangzhou 510275 Guangdong Peoples R China;

    Sun Yat Sen Univ Instrumental Anal & Res Ctr Guangzhou 510275 Guangdong Peoples R China;

    Jinan Univ Guangdong Prov Key Lab Opt Fiber Sensing & Commun Siyuan Lab Guangdong Prov Engn Technol Res Ctr Va Guangzhou Key Lab Vacuum Coating Technol & New En Guangzhou 510632 Guangdong Peoples R China;

    Jinan Univ Guangdong Prov Key Lab Opt Fiber Sensing & Commun Siyuan Lab Guangdong Prov Engn Technol Res Ctr Va Guangzhou Key Lab Vacuum Coating Technol & New En Guangzhou 510632 Guangdong Peoples R China;

    Univ Western Ontario Dept Mech & Mat Engn London ON N6A 5B9 Canada;

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  • 正文语种 eng
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  • 关键词

    breakdown potential; hydrogen evolution reaction; hydrogen oxidation reaction; nonprecious metals; phase#8208; separated alloys;

    机译：击穿势;氢气进化反应;氢氧化反应;非顾客;相分离的合金;

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