Surface-oxidized Fe–Co–Ni alloys anchored to N-doped carbon nanotubes as efficient catalysts for oxygen reduction reaction
Surface-oxidized Fe–Co–Ni alloys anchored to N-doped carbon nanotubes as efficient catalysts for oxygen reduction reaction
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DOI：
10.1016/j.jallcom.2020.158249
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发表时间：
2020-12
影响因子：
6.2
通讯作者：
Z. Wang;Lanzi Cheng;Rui Zhang;W. Lv;Wei Wang
中科院分区：
文献类型：
--
作者：
Z. Wang;Lanzi Cheng;Rui Zhang;W. Lv;Wei Wang
开发一种廉价、高效、稳定的燃料电池氧还原反应（ORR）催化剂有可能帮助解决能源危机。这项工作报道了锚定在氮掺杂碳纳米管 (N-CNT) 上的低成本三元过渡金属合金纳米颗粒，即 Fe2Co2Ni2/N-CNT，作为一种有效的 ORR 催化剂。发现这种三元金属基催化剂的 ORR 性能优于二元金属基催化剂。合金颗粒表面形成的金属氧化物层的不均匀性提供了更多的ORR活性位点。这种新颖的合金颗粒核壳结构使 Fe2Co2Ni2/N-CNT 能够有效催化 ORR。该催化剂的 ORR 起始电位为 0.811 VvsRHE，半波电位为 0.749 VvsRHE，极限电流密度为 5.28 mA cm−2，接近商用 Pt/C 和大多数先前报道的催化剂。值得注意的是，Fe2Co2Ni2/N-CNTs 比 Pt/C 催化剂表现出更好的稳定性和耐甲醇性。这些结果表明，基于碳材料锚定的三元过渡金属合金纳米颗粒的催化剂在清洁能源的储存和转化方面具有巨大的潜力。
Developing a cheap, efficient, and stable oxygen reduction reaction (ORR) catalyst for fuel cells has the potential to help address the energy crisis. This work reports low-cost ternary transition metal alloy nanoparticles anchored to nitrogen-doped carbon nanotubes (N-CNTs),i.e., Fe2Co2Ni2/N-CNTs, as an efficient ORR catalyst. The ORR performance of this ternary metal-based catalyst was found to be better than that of binary metal-based catalysts. The non-uniformities in the metal oxide layer, formed on the surface of the alloy particles, provided more ORR active sites. This novel core-shell structure of the alloy particles allowed Fe2Co2Ni2/N-CNTs to catalyze ORR efficiently. This catalyst exhibits an onset potential of 0.811 VvsRHE, a half-wave potential of 0.749 VvsRHE, and a limiting current density of 5.28 mA cm−2for ORR, which is close to commercial Pt/C and most previously reported catalysts. Notably, Fe2Co2Ni2/N-CNTs exhibits better stability and resistance to methanol than Pt/C catalysts. These results indicate that the catalysts based on ternary transition metal alloy nanoparticles anchored to carbon materials have great potential for storage and transformation of clean energy.