Yang Wenke, Zhang Qing, Peng Cheng, Wu Eyu, Chen Shaowei, Ma Yanyun, Hou Jie, He Yuexiao, Zhang Bangkai, Deng Lifei
College of Materials Science and Engineering, Huaqiao University Xiamen 361021 PR China
Department of Chemistry and Biochemistry, University of California 1156 High Street Santa Cruz California 95064 USA
RSC Adv. 2019 Jan 8;9(2):931-939. doi: 10.1039/c8ra08781d. eCollection 2019 Jan 2.
Developing active and cost-effective electrocatalysts for methanol electrooxidation is crucial to the commercialization of direct methanol fuel cells (DMFCs). In this study, Au@PdAg core-shell nanotubes are synthesized in an aqueous solution by sequential galvanic displacement between Ag nanowires and AuCl and PdCl . High-resolution transmission electron microscopy studies demonstrate that the obtained Au@PdAg nanotubes consist of a Au-rich interior that is encapsulated with a three-dimensionally dendritic, porous PdAg alloy shell, forming a core-sheath nanostructure. Electrochemical studies indicate that the as-prepared Au@PdAg nanotubes exhibit apparent electrocatalytic activity and stability towards methanol electrooxidation in alkaline media. This remarkable high performance can be attributed to their large specific surface area and unique porous morphology.
开发用于甲醇电氧化的活性且具有成本效益的电催化剂对于直接甲醇燃料电池（DMFC）的商业化至关重要。在本研究中，通过银纳米线与AuCl和PdCl之间的顺序电化置换，在水溶液中合成了Au@PdAg核壳纳米管。高分辨率透射电子显微镜研究表明，所获得的Au@PdAg纳米管由富含金的内部组成，该内部被三维树枝状多孔PdAg合金壳包裹，形成核鞘纳米结构。电化学研究表明，所制备的Au@PdAg纳米管在碱性介质中对甲醇电氧化表现出明显的电催化活性和稳定性。这种卓越的高性能可归因于其大的比表面积和独特的多孔形态。
