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首页> 外文期刊>Journal of power sources >Nanoporous PtFe alloys as highly active and durable electrocatalysts for oxygen reduction reaction
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Nanoporous PtFe alloys as highly active and durable electrocatalysts for oxygen reduction reaction

机译：纳米多孔PtFe合金是用于氧还原反应的高活性和持久性电催化剂

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摘要

Nanoporous PtFe alloys with two different bimetallic ratios are fabricated by selectively dealloying PtFeAl ternary alloys, characterized by nanoscaled bicontinuous network skeleton with interconnected hollow channels extending in all three dimensions. The reactive components in PtFeAl ternary alloy were sequentially leached out in a highly controllable manner, generating nanoporous architecture with different bimetallic ratios and the typical ligament size as small as 5 nm. These nanoporous PtFe alloys exhibit much enhanced electrocatalytic activity for oxygen reduction reaction compared with the PtFe/C and Pt/C catalysts. The specific and mass activities for oxygen reduction follow the order of nanoporous Pt_(75)Fe_(25) ＞ nanoporous Pt_(55)Fe_(45) ＞ PtFe/C ＞ Pt/C. In the absence of any catalyst support, the structure stability of nanoporous PtFe alloys is greatly enhanced with less loss of the electrochemical surface area and the oxygen reduction activity upon long-term potential scan tests compared with PtFe/C and Pt/C catalysts. The as-made nanoporous PtFe alloys thus hold great application potential as promising cathode electrocatalyst in proton exchange membrane fuel cells with the advantages of easy preparation along with superior oxygen reduction activity and durability.
机译：通过选择性地脱合金PtFeAl三元合金来制造具有两种不同双金属比的纳米多孔PtFe合金，其特征在于纳米级双连续网络骨架，并具有在所有三个维度上延伸的互连空心通道。以高度可控的方式依次浸出PtFeAl三元合金中的反应成分，生成具有不同双金属比和典型的韧带尺寸小至5 nm的纳米多孔结构。与PtFe / C和Pt / C催化剂相比，这些纳米多孔PtFe合金对氧还原反应具有增强的电催化活性。氧还原的比活度和质量活度依次为纳米多孔Pt_（75）Fe_（25）＞纳米多孔Pt_（55）Fe_（45）＞ PtFe / C＞ Pt / C。在没有任何催化剂载体的情况下，与PtFe / C和Pt / C催化剂相比，在长期电势扫描测试中，纳米多孔PtFe合金的结构稳定性大大提高，电化学表面积的损失更少，氧还原活性更低。因此，所制得的纳米多孔PtFe合金作为质子交换膜燃料电池中有希望的阴极电催化剂具有巨大的应用潜力，其具有易于制备以及优异的氧还原活性和耐久性的优点。

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  • 来源
    《Journal of power sources》 |2014年第10期|589-596|共8页
  • 作者

    Huimei Duan; Qin Hao; Caixia Xu;

  • 作者单位

    Key Laboratory of Chemical Sensing & Analysis in Universities of Shandong, School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, China;

    Key Laboratory of Chemical Sensing & Analysis in Universities of Shandong, School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, China;

    Key Laboratory of Chemical Sensing & Analysis in Universities of Shandong, School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Dealloying; Platinum; Nanoporous; Electrocatalysis; Oxygen reduction reaction;

    机译：经销;铂;纳米孔电催化;氧还原反应;

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