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

doi:10.1021/am404334k

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

ACS Appl Mater Interfaces. 2014 Feb 12;6(3):1589-94. doi: 10.1021/am404334k. Epub 2014 Jan 28.

Authors

Chen-Wei Liu¹, Hong-Shuo Chen, Chien-Ming Lai, Jiunn-Nan Lin, Li-Duan Tsai, Kuan-Wen Wang

Affiliation

¹ Institute of Materials Science and Engineering, National Central University , Taoyuan 320, Taiwan.

PMID: 24447040
DOI: 10.1021/am404334k

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.

Publication types

Research Support, Non-U.S. Gov't