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首页> 外文期刊>Electrocatalysis >Aromatic Ring Size Effect of a Surface Modification Agent on Platinum Nanoparticle Electrocatalysts for Oxygen Reduction Reaction
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Aromatic Ring Size Effect of a Surface Modification Agent on Platinum Nanoparticle Electrocatalysts for Oxygen Reduction Reaction

机译：表面改性剂对铂纳米粒子电催化剂对氧还原反应的芳香环尺寸效应

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摘要

Platinum nanoparticles (NPs) modified with alkylamines containing various aromatic rings (benzyl, naphtyl, anthryl, and pyrenyl) were synthesized as model cathode catalysts for fuel cells to investigate the role of aromatic surface modification agents on catalytic performance. Surface modification of Pt was confirmed by nuclear magnetic resonance spectra for NPs and thermogravimetric analysis for carbon-supported catalysts. Surface modification of Pt NPs with aromatic alkylamines improved the electrocatalytic activities for the oxygen reduction reaction, whose activity values increased by increasing the number of aromatic rings. The effect of surface modification on the electronic properties of the catalyst was evaluated by X-ray photoelectron spectroscopy. A large positive shift in the Pt 4f binding energy of surface-modified catalyst, especially for anthryl and pyrenyl modifications, was observed, indicating that one of the important factors is metal–support interaction facilitated by the aromatic groups through the π–π interactions with carbon support. Graphical Abstract ?.
机译：用含有各种芳环（苄基，萘基，苯乙烯和芘基）的烷基胺改性的铂纳米颗粒（NPS）被合成为模型阴极催化剂，用于燃料电池，研究芳族表面改性剂对催化性能的作用。通过核磁共振谱来确认PT的表面改性，用于NPS和热重分析的碳负载催化剂。具有芳族烷基胺的Pt NPS的表面改性改善了氧还原反应的电催化活性，其活性值通过增加芳环的数量而增加。通过X射线光电子能谱评估表面改性对催化剂的电子性质的影响。观察到表面改性催化剂的PT 4F结合能量的大偏移，特别是对于花酮和芘酯改性，表明其中一个重要因素是通过芳族基团通过π-π相互作用促进的金属支持相互作用碳载体。图形概要 ？。

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