Journal
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
Volume 163, Issue 9, Pages F998-F1003Publisher
ELECTROCHEMICAL SOC INC
DOI: 10.1149/2.0251609jes
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Funding
- Swiss National Science Foundation [20001E_151122/1]
- German Research Foundation [EY 16/18-1]
- European Research Council (ERC)
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The commercial feasibility of polymer electrolyte fuel cells (PEFCs) passes by the development of Pt-based, O-2-reduction catalysts with greater activities and/or lower Pt-contents, as well as an improved stability. In an effort to tackle these requirements, unsupported bimetallic Pt-Ni nanoparticles (NPs) interconnected in the shape of nanochain networks (aerogels) were synthesized using a simple one-step reduction and gel formation process in aqueous solution. The products of this novel synthetic route were characterized by X-ray absorption spectroscopy to elucidate the materials' structure. Using electrochemical experiments, we probed the surface composition of the as-synthesized aerogels and of equivalent materials exposed to acid, and concluded that a Ni-(hydr) oxide side phase is present in the aerogel with a larger Ni-concentration. Regardless of this initial surface composition, the Pt-Ni aerogels feature a approximate to 3-fold increase of surface-specific ORR activity when compared to a commercial platinum-on-carbon catalyst, reaching the mass-specific requirement for application in automotive PEFCs. (C) The Author(s) 2016. Published by ECS. All rights reserved.
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