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

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

Graduate Institute of Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

25 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 language	English
Pages (from-to)	1589-1594
Number of pages	6
Journal	ACS Applied Materials and Interfaces
Volume	6
Issue number	3
DOIs	https://doi.org/10.1021/am404334k
State	Published - 12 Feb 2014

Keywords

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

Access to Document

10.1021/am404334k

Cite this

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

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.",

keywords = "accelerated durability test (ADT), oxygen reduction reaction (ORR), Pt-Au, surface segregation, unfilled d states",

author = "Liu, {Chen Wei} and Chen, {Hong Shuo} and Lai, {Chien Ming} and Lin, {Jiunn Nan} and Tsai, {Li Duan} and Wang, {Kuan Wen}",

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T1 - Promotion of oxygen reduction reaction durability of carbon-supported PtAu catalysts by surface segregation and TiO2 addition

AU - Liu, Chen Wei

AU - Chen, Hong Shuo

AU - Lai, Chien Ming

AU - Lin, Jiunn Nan

AU - Tsai, Li Duan

AU - Wang, Kuan Wen

PY - 2014/2/12

Y1 - 2014/2/12

N2 - 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.

AB - 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.

KW - accelerated durability test (ADT)

KW - oxygen reduction reaction (ORR)

KW - Pt-Au

KW - surface segregation

KW - unfilled d states

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