Dong Yan, Wang Yuan, Tian Ziqi, Jiang Kemin, Li Yanle, Lin Yichao, Oloman Colin W, Gyenge Elod L, Su Jianwei, Chen Liang
Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China.
Department of Chemical and Biological Engineering, Clean Energy Research Center (CERC), The University of British Columbia, Vancouver V6T 1Z3, Canada.
Innovation (Camb). 2021 Sep 2;2(4):100161. doi: 10.1016/j.xinn.2021.100161. eCollection 2021 Nov 28.
Defect engineering is a promising strategy for supported catalysts to improve the catalytic activity and durability. Here, we selected the carbon (C) matrix enriched with topological defects to serve as the substrate material, in which the topological defects can act as anchoring centers to trap Pt nanoparticles for driving the O reduction reactions (ORRs). Both experimental characterizations and theoretical simulations revealed the strong Pt-defect interaction with enhanced charge transfer on the interface. Despite a low Pt loading, the supported catalyst can still achieve a remarkable 55 mV positive shift of half-wave potential toward ORR in O-saturated 0.1 M HClO electrolyte compared with the commercial Pt catalyst on graphitized C. Moreover, the degeneration after 5,000 voltage cycles was negligible. This finding indicates that the presence of strong interaction between Pt and topological C defects can not only stabilize Pt nanoparticles but also optimize the electronic structures of Pt/C catalysts toward ORR.
缺陷工程是一种用于负载型催化剂以提高催化活性和耐久性的有前景的策略。在此，我们选择富含拓扑缺陷的碳（C）基质作为基底材料，其中拓扑缺陷可作为锚定中心来捕获铂纳米颗粒以驱动氧还原反应（ORR）。实验表征和理论模拟均揭示了铂与缺陷之间存在强烈的相互作用，且界面上的电荷转移增强。尽管铂负载量较低，但与石墨化碳上的商业铂催化剂相比，该负载型催化剂在O饱和的0.1 M HClO电解质中对于ORR的半波电位仍可实现显著的55 mV正向偏移。此外，经过5000次电压循环后的退化可忽略不计。这一发现表明，铂与拓扑碳缺陷之间强相互作用的存在不仅可以稳定铂纳米颗粒，还可以优化Pt/C催化剂对ORR的电子结构。
