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Research Paper

Studies on the Reduction Mechanism of Oxygen on Ag/C Catalysts in Alkaline Solutions

[+] Author and Article Information
Jia-Jun Han, Lin Geng

School of Materials Science and Engineering,
Harbin Institute of Technology,
Harbin 150001, China

De-Li Liu

School of Marine Science and Technology,
Harbin Institute of Technology at Weihai,
Weihai 264209, China

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF FUEL CELL SCIENCE AND TECHNOLOGY. Manuscript received May 16, 2013; final manuscript received July 15, 2013; published online September 13, 2013. Editor: Nigel M. Sammes.

J. Fuel Cell Sci. Technol 10(6), 061004 (Sep 13, 2013) (4 pages) Paper No: FC-13-1053; doi: 10.1115/1.4025055 History: Received May 16, 2013; Revised July 15, 2013

Carbon-supported silver (Ag/C) catalysts with different Ag contents are prepared using the Ag (I) coordination polymer, [Ag(C7H6NO2)(C6H12N4)(H2O)]n. The mechanism and activity of the oxygen reduction reaction (ORR) on these Ag/C catalysts are investigated by the cyclic voltammetry and the rotating ring disk electrode (RRDE) in alkaline solutions. The test results indicate that, under the same Ag crystallite sizes, the activities increase with increasing Ag contents from 5 to 20 wt.% and the ORR proceeds by a four-electron pathway on Ag/C catalysts, but with decreasing Ag contents, the ORR is catalyzed via the four-electron pathway and the two-electron pathway simultaneously.

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Figures

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Fig. 1

SEM images of (a) 20-, (b) 10-, and (c) 5-wt.% Ag/C catalysts

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Fig. 2

XRD patterns of (a) 20-, (b) 10-, and (c) 5-wt.% Ag/C catalysts and (d) Vulcan-XC 72R carbon

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Fig. 3

Cyclic voltammetries of (a) 20-, (b) 10-, and (c) 5-wt.% Ag/C catalysts

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Fig. 4

Polarization curves of the oxygen reduction on (a) 20-, (b) 10-, and (c) 5-wt.% Ag/C catalysts

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Fig. 5

Levich plots of the oxygen reduction on (a) 20-, (b) 10-, and (c) 5-wt.% Ag/C catalysts

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