Oxidation triggered atomic restructures enhancing the electrooxidation activities of carbon supported platinum-ruthenium catalysts

Po Chun Huang, Hong Shuo Chen, Yu Ting Liu, I. Li Chen, Sheng Yang Huang, Ha M. Nguyen, Kuan Wen Wang, Chi Chang Hu, Tsan Yao Chen

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

This study demonstrated that the methanol oxidation reaction (MOR) activity of carbon supported platinum-ruthenium catalysts (Pt-Ru/C) could be enhanced 2.6-fold with adequate oxidation treatment. Our results show that such enhancement is triggered by the hetero-junction of Pt atomic layers on a tetragonal phased RuO2 crystal. In a freshly prepared sample, the nanocatalysts (NCs) were built on a Ru rich core capped by a PtRu alloy shell. The thermal treatment restructures the Pt and Ru atoms to form an ordered heterojunction at the core-shell interface and optimize the activity of the NCs at a temperature of 520 K. The higher temperature oxidizes the Ru into a crystallite rutile RuO2 phase. In such cases the Pt atoms were segregated to form individual crystallites by a substantial lattice mismatch between the metallic Pt and RuO2 phases. This work presents a systematic analysis with theoretical modelling and quantitative characterization, manipulating the structural evolution and thus optimizing the MOR activity of Pt-Ru/C catalysts. This journal is

Original languageEnglish
Pages (from-to)10066-10079
Number of pages14
JournalCrystEngComm
Volume16
Issue number43
DOIs
StatePublished - 21 Nov 2014

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