Nickel supported on nitrogen-doped carbon nanotubes as hydrogen oxidation reaction catalyst in alkaline electrolyte.
Nickel supported on nitrogen-doped carbon nanotubes as hydrogen oxidation reaction catalyst in alkaline electrolyte.
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DOI：
10.1038/ncomms10141
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发表时间：
2016-01-14
影响因子：
16.6
通讯作者：
Yan Y
中科院分区：
文献类型：
--
作者：
Zhuang Z;Giles SA;Zheng J;Jenness GR;Caratzoulas S;Vlachos DG;Yan Y
低成本、高性能的不含铂族金属的氢氧化物交换膜燃料电池的开发由于在阳极处缺乏氢氧化反应催化剂而受到阻碍。在这里，我们报告了一种复合催化剂，负载在氮掺杂的碳纳米管上的镍纳米颗粒，在碱性电解液中具有类似于铂族金属的氢氧化活性。虽然氮掺杂的碳纳米管是一种非常差的氢氧化催化剂，但作为载体，它使镍纳米颗粒的催化性能相对于未负载的镍纳米颗粒提高了33倍（质量活性）或21倍（交换电流密度）。密度泛函理论计算表明，氮掺杂载体使纳米颗粒稳定，防止重构，而位于纳米颗粒边缘的氮通过影响镍的d轨道来调整局部吸附位点。由于其高活性和低成本，我们的催化剂显示出在低成本，高性能燃料电池中使用的巨大潜力。 低成本氢氧化物交换膜燃料电池需要廉价且有效的氢氧化催化剂。在这里，作者报道了负载在氮掺杂的碳纳米管上的镍纳米颗粒在碱性电解质中具有与铂族金属类似的氢氧化活性。
The development of a low-cost, high-performance platinum-group-metal-free hydroxide exchange membrane fuel cell is hindered by the lack of a hydrogen oxidation reaction catalyst at the anode. Here we report that a composite catalyst, nickel nanoparticles supported on nitrogen-doped carbon nanotubes, has hydrogen oxidation activity similar to platinum-group metals in alkaline electrolyte. Although nitrogen-doped carbon nanotubes are a very poor hydrogen oxidation catalyst, as a support, it increases the catalytic performance of nickel nanoparticles by a factor of 33 (mass activity) or 21 (exchange current density) relative to unsupported nickel nanoparticles. Density functional theory calculations indicate that the nitrogen-doped support stabilizes the nanoparticle against reconstruction, while nitrogen located at the edge of the nanoparticle tunes local adsorption sites by affecting the d-orbitals of nickel. Owing to its high activity and low cost, our catalyst shows significant potential for use in low-cost, high-performance fuel cells. Cheap and efficient hydrogen oxidation catalysts are needed for low cost hydroxide exchange membrane fuel cells. Here, the authors report that nickel nanoparticles supported on nitrogen doped carbon nanotubes have hydrogen oxidation activity similar to platinum-group-metals in alkaline electrolyte.