Simple replacement reaction for the preparation of ternary Fe 1-xPtRu x nanocrystals with superior catalytic activity in methanol oxidation reaction

Di Yan Wang, Hung Lung Chou, Yen Chen Lin, Feng Ju Lai, Ching Hsiang Chen, Jyh Fu Lee, Bing Joe Hwang, Chia Chun Chen

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Abstract

The finding of new metal alloyed nanocrystals (NCs) with high catalytic activity and low cost to replace PtRu NCs is a critical step toward the commercialization of fuel cells. In this work, a simple cation replacement reaction was utilized to synthesize a new type of ternary Fe 1-xPtRu x NCs from binary FePt NCs. The detailed structural transformation from binary FePt NCs to ternary Fe 1-xPtRu x NCs was analyzed by X-ray absorption spectroscopy (XAS). Ternary Fe 35Pt 40Ru 25, Fe 31Pt 40Ru 29, and Fe 17Pt 40Ru 43 NCs exhibit superior catalytic ability to withstand CO poisoning in methanol oxidation reaction (MOR) than do binary NCs (FePt and J-M PtRu). Also, the Fe 31Pt 40Ru 29 NCs had the highest alloying extent and the lowest onset potential among the ternary NCs. Furthermore, the origin for the superior CO resistance of ternary Fe 1-xPtRu x NCs was investigated by determining the adsorption energy of CO on the NCs surfaces and the charge transfer from Fe/Ru to Pt using a simulation based on density functional theory. The simulation results suggested that by introducing a new metal into binary PtRu/PtFe NCs, the anti-CO poisoning ability of ternary Fe 1-xPtRu x NCs was greatly enhanced because the bonding of CO-Pt on the NCs surface was weakened. Overall, our experimental and simulation results have indicated a simple route for the discovery of new metal alloyed catalysts with superior anti-CO poisoning ability and low usage of Pt and Ru for fuel cell applications.

Original languageEnglish
Pages (from-to)10011-10020
Number of pages10
JournalJournal of the American Chemical Society
Volume134
Issue number24
DOIs
Publication statusPublished - 2012 Jun 20

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ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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