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Platinum thin film anodes for solid acid fuel cells

Louie, Mary W. and Haile, Sossina M. (2011) Platinum thin film anodes for solid acid fuel cells. Energy and Environmental Science, 4 (10). pp. 4230-4238. ISSN 1754-5692.

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Hydrogen electro-oxidation kinetics at the Pt | CsH_2PO_4 interface have been evaluated. Thin films of nanocrystalline platinum 7.5–375 nm thick and 1–19 mm in diameter were sputtered atop polycrystalline discs of the proton-conducting electrolyte, CsH_2PO_4, by shadow-masking. The resulting Pt | CsH_2PO_4 | Pt symmetric cells were studied under uniform H_2-H_2O-Ar atmospheres at temperatures of 225–250 °C using AC impedance spectroscopy. For thick platinum films (>50 nm), electro-oxidation of hydrogen was found to be limited by diffusion of hydrogen through the film, whereas for thinner films, diffusion limitations are relaxed and interfacial effects become increasingly dominant. Extrapolation to vanishing film thickness implies an ultimate interfacial resistivity of 2.2 Ω cm^2, likely reflecting a process at the Pt | H_(2(g)) interface. Films 7.5 nm in thickness displayed a total electro-oxidation resistivity, R, of 3.1 Ω cm^2, approaching that of Pt-based composite anodes for solid acid fuel cells (1–2 Ω cm^2). In contrast, the Pt utilization (R^(−1)/Pt loading), 19 S mg^(−1), significantly exceeds that of composite electrodes, indicating that the thin film approach is a promising route for achieving high performance in combination with low platinum loadings.

Item Type:Article
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URLURL TypeDescription DOIArticle
Haile, Sossina M.0000-0002-5293-6252
Additional Information:© 2011 Royal Society of Chemistry. Received 3rd June 2011, Accepted 27th July 2011. First published on the web 19 Aug 2011. This material is based upon work supported by the National Science Foundation under Grants No. DMR-0906543 and DMR-0520565. Funding was also provided by the Gordon and Betty Moore Foundation through the Caltech Center for Sustainable Energy Research. M. W. Louie was supported in part through the NSF Graduate Research Fellowship Program. The authors thank William Chueh for programming assistance and Calum Chisholm and Yoshihiro Yamazaki for valuable discussion.
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Gordon and Betty Moore FoundationUNSPECIFIED
NSF Graduate Research FellowshipUNSPECIFIED
Issue or Number:10
Record Number:CaltechAUTHORS:20111108-070046715
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Official Citation:Platinum thin film anodes for solid acid fuel cells Mary W. Louie and Sossina M. Haile Energy Environ. Sci., 2011, 4, 4230-4238 DOI: 10.1039/C1EE01889B
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:27660
Deposited By: Ruth Sustaita
Deposited On:08 Nov 2011 15:39
Last Modified:03 Oct 2019 03:25

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