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Pt35Cu65 nanoarchitecture: a highly durable and effective electrocatalyst towards methanol oxidation

机译：Pt35Cu65纳米结构：一种高度耐用且有效的甲醇氧化电催化剂

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摘要

Aiming at electro-catalytic performance enhancement and reduction of catalyst cost, PtxCu1-x (Pt35Cu65, Pt53Cu47, and Pt68Cu32) nanoarchitecture samples with controllable atomic composition, similar morphology and particle-size have been prepared by using a one-pot chemical route. The as-prepared PtxCu1-x nanoarchitectures are confirmed as consisting of the integration of initial small alloy nanoparticles (NPs), resulting in an interconnected nanoporous structure. The electrochemical experiments indicate that these PtxCu1-x nanocatalysts exhibit atomic composition dependent catalytic activity, although the surfaces of all the catalysts were characterized to be featured with a Pt enrichment structure. With optimal atomic composition, the Pt35Cu65 catalyst possesses enhanced electro-catalytic activities towards methanol oxidation in comparison with other PtxCu1-x samples and pure Pt catalyst with similar morphology. Furthermore, the integrated Pt35Cu65 nanoarchitecture displays good durability during the long term electrochemical scanning through as many as 1500 cycles. The comparable catalytic performance of Pt35Cu65 catalyst could be attributed to the interconnected initial small NPs, formation of open porous structure, durable nanoarchitecture, and synergetic effect of the alloyed atoms. The structural evolution from metastable small alloy NPs to integrated stable nanoarchitectures may provide new opportunities to design and prepare novel composite materials with durable structure and effective catalytic properties.
机译：为了提高电催化性能并降低催化剂成本，采用一锅化学路线制备了具有可控原子组成，相似形貌和粒度的PtxCu1-x（Pt35Cu65，Pt53Cu47和Pt68Cu32）纳米结构样品。确认所制备的PtxCu1-x纳米结构由初始小合金纳米颗粒（NPs）的整合组成，从而形成相互连接的纳米多孔结构。电化学实验表明，尽管所有催化剂的表面均具有Pt富集结构，但这些PtxCu1-x纳米催化剂具有依赖于原子组成的催化活性。与其他PtxCu1-x样品和具有相似形态的纯Pt催化剂相比，Pt35Cu65催化剂具有最佳的原子组成，对甲醇氧化具有增强的电催化活性。此外，集成的Pt35Cu65纳米结构在经过多达1500个循环的长期电化学扫描中显示出良好的耐久性。 Pt35Cu65催化剂可比的催化性能可归因于相互连接的初始小NP，形成的开孔结构，持久的纳米结构以及合金原子的协同效应。从亚稳态小合金NP到集成的稳定纳米结构的结构演变可能为设计和制备具有耐用结构和有效催化性能的新型复合材料提供新的机会。

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