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Chem Mater: Porous ultrathin Pt-Ag nanotubes for enhanced MOR activity, by Hongpo et al
发布者: 高传博 | 2018-10-24

 

Hongpo's paper has been accepted for publication in Chemistry of Materials (IF 9.890). Congratulations for the excellent work!

Title: Ultrathin Pt-Ag Alloy Nanotubes with Regular Nanopores for Enhanced Electrocatalytic Activity

Authors: Hongpo Liu, Kai Liu, Ping Zhong, Jing Qi, Jihong Bian, Qikui Fan, Kui Ren, Haoquan Zheng, Lu Han, Yadong Yin, and Chuanbo Gao*

Link to the Publisher: https://pubs.acs.org/doi/10.1021/acs.chemmater.8b03085

Abstract: While creating open nanostructures represents a popular strategy toward improved utilization efficiency of Pt-based catalysts for electrochemical reactions, the exposed facets should be precisely controlled for further enhancement in the catalytic activity. Here, we report a novel strategy to create regularly shaped nanopores in ultrathin nanotubes of bimetallic noble metals. By templating against Ag nanowires and then applying a thermal ripening process, we have successfully produced ultrathin (with a wall thickness of ~ 1 nm) Pt-Ag alloy nanotubes containing high-density well-defined rectangular nanopores and a collapsed double-layer structure. The resulting porous nanotubes expose {100} facets at the basal sides and {110} facets with step sites at the edges of the rectangular nanopores. The particu-lar surface structure and the bimetallic composition enable suppressed CO poisoning of the catalysts and consequent-ly enhanced electrocatalytic activity in the methanol oxidation reaction (MOR). The typical specific and mass activities are 6.63 mA cm–2 and 2.08 mA μg–1Pt, respectively, in an acidic medium, superior to the commercial Pt/C and many previously reported catalysts. We believe this work opens new opportunities in the design of noble metal open nanostructures for enhanced performance in a broad range of catalytic applications.