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Topographical and compositional engineering of core-shell Ni@Pt ORR electro-catalysts

机译：核心壳Ni @ Pt Orr电催化剂的地形和组成工程

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摘要

Complex faceted geometries and compositional anisotropy in alloy nanoparticles (NPs) can enhance catalytic performance. We report on the preparation of binary PtNi NPsviaa co-thermolytic approach in which we optimize the synthesis variables, which results in significantly improved catalytic performance. We used scanning transmission electron microscopy to characterise the range of morphologies produced, which included spherical and concave cuboidal core-shell structures. Electrocatalytic activity was evaluated using a rotating disc electrode (1600 rpm) in 0.1 M HClO4; the electrocatalytic performance of these Ni@Pt NPs showed significant (similar to 11-fold) improvement compared to a commercial Pt/C catalyst. Extended cycling revealed that electrochemical surface area was retained by cuboidal PtNi NPs post 5000 electrochemical cycles (0.05-1.00 V,vs.SHE). This is attributed to the enclosure of Ni atoms by a thick Pt shell, thus limiting Ni dissolution from the alloy structures. The novel synthetic strategy presented here results in a high yield of Ni@Pt NPs which show excellent electro-catalytic activity and useful durability.
机译：合金纳米粒子（NPS）中复杂的面部几何形状和组成各向异性可以增强催化性能。我们报告了二元PTNI NPSVIAA共热方法的制备，其中我们优化了合成变量，导致催化性能显着提高。我们使用扫描透射电子显微镜来表征产生的形态范围，包括球形和凹形立方体壳结构。使用旋转盘电极（1600rpm）在0.1m HClO4中进行电催化活性;与商业PT / C催化剂相比，这些Ni @ Pt NP的电催化性能显示出显着的（类似于11倍）的改善。扩展循环显示，通过立方体PTNI NPS柱5000电化学循环保留电化学表面积（0.05-1.00V，Vs.she）。这归因于厚PT壳的Ni原子的外壳，从而限制了来自合金结构的Ni溶解。这里提出的新型合成策略导致高产Ni @ Pt NPS，其显示出优异的电催化活性和有用的耐久性。

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  • 来源
    《RSC Advances》 |2020年第49期|共10页
  • 作者

    Leteba Gerard M.; Mitchell David R. G.; Levecque Pieter B. J.; van Steen Eric; Lang Candace I;

  • 作者单位

    Univ Cape Town Catalysis Inst Dept Chem Engn ZA-7700 Cape Town South Africa;

    Univ Wollongong Electron Microscopy Ctr Innovat Campus Wollongong NSW 2517 Australia;

    Univ Cape Town Catalysis Inst Dept Chem Engn ZA-7700 Cape Town South Africa;

    Univ Cape Town Catalysis Inst Dept Chem Engn ZA-7700 Cape Town South Africa;

    Macquarie Univ Sch Engn Sydney NSW 2109 Australia;

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  • 正文语种 eng
  • 中图分类 化学;
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