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Does the oxophilic effect serve the same role for hydrogen evolution/oxidation reaction in alkaline media?

机译：乳化效果是否为碱性培养基中的氢进化/氧化反应提供了相同的作用？

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摘要

Improving the slow kinetics of hydrogen evolution/oxidation reaction(HER/HOR) on Pt in the alkaline electrolyte is key to the development of water splitting and hydroxide exchange membrane fuel cells, which feature a potential cost advantage over their acid-operating counterparts. However, it is still unconfirmed whether adsorbed surface hydroxyl species (OHad) plays a significant role in determining HER/HOR activity. Moreover, the active sites should be different in the alkaline due to the sluggish reaction rate. In the present work, electrochemical tests have shown that for modified bulk Pt surface and Pt3Ni nanoalloy, HER rate is co-determined by the oxophilic effect and electronic effect, while the rate of HOR is associated with the electronic effect. Density functional theory (DFT) calculations reveal the fundamentally different HER and HOR mechanism of Pt-based nanoparticles, and the surface charge may account for such difference. Finally, the adsorption and oxidation of carbon monoxide (CO) as a novel descriptor are provided to predicate the activity of HER and HOR.
机译：改善碱性电解质中PT的氢进化/氧化反应（HI / HOR）的缓慢动力学是水分裂和氢氧化物交换膜燃料电池的关键，其在其酸操作对应上具有潜在的成本优势。然而，仍然未经证实吸附表面羟基物质（OHAD）在确定她/ hor活动方面发挥重要作用。此外，由于反应速率缓慢，活性位点应在碱性中不同。在本作本作中，电化学试验表明，对于改进的块状Pt表面和PT3NI纳米铝合金，其速率通过抗乳化效应和电子效应共确定，而HOR的速率与电子效果相关。密度函数理论（DFT）计算揭示了基于PT基纳米颗粒的基本不同的她和Hor机理，并且表面电荷可能占这种差异。最后，提供了一氧化碳（CO）作为新型描述符的吸附和氧化，以使其和HOR的活性谓。

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  • 来源
    《Nano Energy》 |2019年第2019期|共9页
  • 作者

    Shen Lin-fan; Lu Bang-an; Qu Xi-ming; Ye Jin-yu; Zhang Jun-ming; Yin Shu-hu; Wu Qi-hui; Wang Rui-xiang; Shen Shou-yu; Sheng Tian; Jiang Yan-xia; Sun Shi-gang;

  • 作者单位

    Xiamen Univ Coll Chem &

    Chem Engn Dept Chem State Key Lab Phys Chem Solid Surfaces Xiamen 361005 Fujian Peoples R China;

    Xiamen Univ Coll Chem &

    Chem Engn Dept Chem State Key Lab Phys Chem Solid Surfaces Xiamen 361005 Fujian Peoples R China;

    Xiamen Univ Coll Chem &

    Chem Engn Dept Chem State Key Lab Phys Chem Solid Surfaces Xiamen 361005 Fujian Peoples R China;

    Xiamen Univ Coll Chem &

    Chem Engn Dept Chem State Key Lab Phys Chem Solid Surfaces Xiamen 361005 Fujian Peoples R China;

    Xiamen Univ Coll Chem &

    Chem Engn Dept Chem State Key Lab Phys Chem Solid Surfaces Xiamen 361005 Fujian Peoples R China;

    Xiamen Univ Coll Chem &

    Chem Engn Dept Chem State Key Lab Phys Chem Solid Surfaces Xiamen 361005 Fujian Peoples R China;

    Jimei Univ Coll Mech &

    Energy Engn Xiamen 361021 Fujian Peoples R China;

    Xiamen Univ Coll Chem &

    Chem Engn Dept Chem State Key Lab Phys Chem Solid Surfaces Xiamen 361005 Fujian Peoples R China;

    Xiamen Univ Coll Chem &

    Chem Engn Dept Chem State Key Lab Phys Chem Solid Surfaces Xiamen 361005 Fujian Peoples R China;

    Anhui Normal Univ Coll Chem &

    Mat Sci Wuhu 241000 Peoples R China;

    Xiamen Univ Coll Chem &

    Chem Engn Dept Chem State Key Lab Phys Chem Solid Surfaces Xiamen 361005 Fujian Peoples R China;

    Xiamen Univ Coll Chem &

    Chem Engn Dept Chem State Key Lab Phys Chem Solid Surfaces Xiamen 361005 Fujian Peoples R China;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 能源与动力工程;
  • 关键词

    Hydrogen evolution reaction; Hydrogen oxidation reaction; Oxophilic effect; Electronic effect; Pt-based alloy;

    机译：氢气进化反应;氢氧化反应;致苯并疗效;电子效果;PT基合金;

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