Promotion of oxygen reduction reaction durability of carbon-supported PtAu catalysts by surface segregation and TiO2 addition

Chen Wei Liu, Hong Shuo Chen, Chien Ming Lai, Jiunn Nan Lin, Li Duan Tsai, Kuan Wen Wang

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

Highly effective carbon supported-Pt75Au25 catalysts for oxygen reduction reaction (ORR) are prepared though titanium dioxide modification and post heat treatment. After accelerated durability test (ADT) of 1700 cycles, the ORR activity of PtAu/C catalysts modified by TiO2 and air heat treatment is 3 times higher than that of the commercial Pt/C. The enhancement of ORR activity is attributed to surface and structural alteration by air-induced Pt surface segregation and lower unfilled d states. On the contrary, for TiO2 modified and H2 treated PtAu/C catalysts, the deterioration of the ORR activity may be due to the loss of electrochemical surface area after ADT and the increase of d-band vacancy.

Original languageEnglish
Pages (from-to)1589-1594
Number of pages6
JournalACS Applied Materials and Interfaces
Volume6
Issue number3
DOIs
StatePublished - 12 Feb 2014

Keywords

  • accelerated durability test (ADT)
  • oxygen reduction reaction (ORR)
  • Pt-Au
  • surface segregation
  • unfilled d states

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