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Research Papers

A PEFC With PtTiO2/C as Oxygen-Reduction Catalyst

[+] Author and Article Information
G. Selvarani

 CSIR-Central Electrochemical Research Institute, CECRI-Madras Unit, CSIR Complex, Taramani, Chennai 600 113, Indiaselvarani80@gmail.com

S. Maheswari

 CSIR-Central Electrochemical Research Institute, CECRI-Madras Unit, CSIR Complex, Taramani, Chennai 600 113, Indiamahes.suma@gmail.com

P. Sridhar

 CSIR-Central Electrochemical Research Institute, CECRI-Madras Unit, CSIR Complex, Taramani, Chennai 600 113, Indiapsridhar55@gmail.com

S. Pitchumani

 CSIR-Central Electrochemical Research Institute, CECRI-Madras Unit, CSIR Complex, Taramani, Chennai 600 113, Indiaspmanicecri@gmail.com

A. K. Shukla1

Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560 012, Indiaakshukla2006@gmail.com

1

Corresponding author.

J. Fuel Cell Sci. Technol 8(2), 021003 (Nov 24, 2010) (8 pages) doi:10.1115/1.4002466 History: Received March 15, 2010; Revised July 16, 2010; Published November 24, 2010; Online November 24, 2010

Carbon-supported PtTiO2(PtTiO2/C) catalyst with varying atomic ratio of Pt to Ti, namely, 1:1, 2:1, and 3:1, is prepared by sol-gel method and its electrocatalytic activity toward oxygen-reduction reaction (ORR) is evaluated for the application in polymer electrolyte fuel cells (PEFCs). The optimum atomic ratio of Pt to Ti in PtTiO2/C and annealing temperature are established by cyclic voltammetry and fuel-cell-polarization studies. PtTiO2/C annealed at 750°C with Pt and Ti in atomic ratio of 2:1, namely, 750PtTiO2/C (2:1), shows enhanced electrocatalytic activity toward ORR. It is found that the incorporation of TiO2 with Pt ameliorates both electrocatalytic activity and stability of cathode in relation to pristine Pt cathode, currently being used in PEFCs. A power density of 0.75W/cm2 is achieved at 0.6 V for the PEFC with 750PtTiO2/C (2:1) as compared with 0.62W/cm2 at 0.6 V achieved with the PEFC comprising Pt/C as cathode catalyst while operating under identical conditions. Interestingly, carbon-supported PtTiO2 cathode exhibits only 6% loss in electrochemical surface area after 5000 potential cycles while it is as high as 25% for Pt/C.

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Figures

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Figure 1

Steady-state cyclic voltammograms for Pt/C, 750 Pt/C, and 750 Pt–TiO2/C with varying Pt to Ti atomic ratios in N2-saturated aq. 0.5MHClO4 (scan rate: 50 mV/s)

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Figure 2

Steady-state performance curves for H2–O2 PEFCs employing Pt/C, 750 Pt/C, and 750 Pt–TiO2/C (with varying Pt to Ti atomic ratio) cathodes

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Figure 3

Steady-state performance curves for H2–O2 PEFCs employing 600 Pt–TiO2/C (2:1), 750 Pt–TiO2/C (2:1), and 900 Pt–TiO2/C (2:1) cathodes

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Figure 4

Schematic diagrams for PEFCs with MEAs comprising: (a) Pt/C without composite layer, (b) carbon and Nafion admixture as composite layer, and (c) carbon-supported titanium oxide and Nafion admixture as composite layer

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Figure 5

Steady-state performance curves for H2–O2 PEFCs with MEAs comprising: (a) Pt/C without composite layer, (b) carbon and Nafion admixture as composite layer, and (c) carbon-supported titanium oxide and Nafion admixture as composite layer

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Figure 6

Linear sweep voltammograms for ORR on Pt/C and 750 Pt–TiO2/C (2:1) catalysts in O2 saturated aq. 0.5MHClO4 at 1 mV/s scan rate and 1200 rpm

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Figure 7

Transmission electron micrographs for: (a) Pt/C, (b) 750 Pt/C, (c) 750 Pt–TiO2/C (3:1), (d) 750 Pt–TiO2/C (2:1), and (e) 750 Pt–TiO2/C (1:1) catalysts

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Figure 8

Powder X-ray diffraction patterns for: (a) Pt/C, (b) 750 Pt/C, and (c) 750 Pt–TiO2/C (2:1) catalysts

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Figure 9

X-ray photoelectron spectra for Ti (2p) region in 750 Pt–TiO2/C (2:1) catalyst

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Figure 10

X-ray photoelectron spectra for O (1s) region in: (a) 750 Pt/C and (b) 750 Pt–TiO2/C (2:1). The solid lines represent the fitted XPS spectra and broken lines represent the peaks due to various oxides.

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Figure 11

Cyclic voltammograms for PEFCs with (a) 750 Pt–TiO2/C (2:1) and (b) Pt/C cathodes for the 1st and 5000th potential cycles (scan rate: 50 mV/s)

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