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首页> 外文期刊>Journal of Materials Chemistry, A. Materials for energy and sustainability >Highly active reduction of oxygen on a FeCo alloy catalyst encapsulated in pod-like carbon nanotubes with fewer walls
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Highly active reduction of oxygen on a FeCo alloy catalyst encapsulated in pod-like carbon nanotubes with fewer walls

机译：封装在具有较少壁的豆荚状碳纳米管中的FeCo合金催化剂上的高活性氧还原

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摘要

Employing an alternative of the Pt-based electrocatalysts for oxygen reduction reaction (ORR) has become a major interest in the fundamental research of the polymer electrolyte membrane fuel cells (PEMFCs). The carbon-encapsulated metal catalyst, on which O2 is readily activated by the electrons transferred from the metal to the carbon surface, has recently been demonstrated as a promising strategy to produce robust non-precious metal electrocatalysts. However, the thickness of carbon walls might affect the process of the electron transfer, and subsequently the ORR activity. It is thus vital to explore the influence of the carbon wall thickness on the ORR reactivity for further improvement in designing carbon-encapsulated non-precious metal catalysts for ORR. Herein, we report a novel FeCo alloy catalyst encapsulated in pod-like carbon nanotubes via introducing graphene nanosheets into the raw materials to tailor the carbon wall thickness. The ORR activity of these catalysts increases drastically with the decreased thickness of the carbon walls, which could be attributed to the enhanced adsorption of O2 on the carbon surface upon decreasing the carbon wall thickness. These findings provide a route for the rational design of high-performance non-precious metal cathode catalysts in PEMFCs.
机译：对于氧还原反应（ORR），采用基于Pt的电催化剂的替代方案已经成为聚合物电解质膜燃料电池（PEMFC）的基础研究中的主要兴趣。最近已经证明了碳封装的金属催化剂，其上的O2容易被从金属转移到碳表面的电子活化，是生产坚固的非贵金属电催化剂的一种有前途的策略。但是，碳壁的厚度可能会影响电子转移的过程，进而影响ORR活性。因此，至关重要的是探索碳壁厚度对ORR反应性的影响，以进一步改进设计用于ORR的碳包封的非贵金属催化剂。在这里，我们报告了一种新型的FeCo合金催化剂，该催化剂通过将石墨烯纳米片引入原材料中来定制碳壁厚度，从而封装在荚状碳纳米管中。这些催化剂的ORR活性随着碳壁厚度的减少而急剧增加，这可以归因于当碳壁厚度减小时O 2在碳表面上的吸附增强。这些发现为合理设计PEMFC中的高性能非贵金属阴极催化剂提供了一条途径。

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