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  Nitrogen-doped hollow carbon spheres as a support for platinum-based electrocatalysts

Galeano Nuñez, D. C., Meier, J. C., Soorholtz, M., Bongard, H.-J., Baldizzone, C., Mayrhofer, K. J. J., et al. (2014). Nitrogen-doped hollow carbon spheres as a support for platinum-based electrocatalysts. ACS Catalysis, 4(11), 3856-3868. doi:10.1021/cs5003492.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0024-C6D4-1 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0024-C6D5-0
Genre: Journal Article

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 Creators:
Galeano Nuñez, Diana Carolina1, Author              
Meier, Josef C.2, Author              
Soorholtz, Mario3, Author              
Bongard, Hans-Josef4, Author              
Baldizzone, Claudio2, Author              
Mayrhofer, Karl J. J.2, Author              
Schüth, Ferdi1, Author              
Affiliations:
1Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1445589              
2Electrocatalysis, Interface Chemistry and Surface Engineering, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863354              
3Research Group Palkovits, Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1445615              
4Service Department Lehmann (EMR), Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1445625              

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Free keywords: electrocatalysis; nitrogen-doped carbon; platinum nanoparticles; stability; fuel cells
 Abstract: Platinum and platinum alloys supported on carbon materials are the state of the art electrocatalysts for the essential oxygen reduction reaction (ORR) in low-temperature fuel cells. The limited stability of such materials under the often detrimental operation conditions of fuel cells still remains a critical issue to improve. In this work, we explore the impact of nitrogen-doped carbon supports on the activity and stability of platinum-based fuel cell catalysts. We present a nitrogen-doped mesostructured carbon material, nitrogen-doped hollow carbon spheres (NHCS), as a support for platinum-based electrocatalysts. A detailed study of the electrochemical activity and stability was carried out for two Pt@NHCS materials i.e., as-made material (Pt@NHCS) with a Pt particle size smaller than 2 nm and the corresponding material after thermal treatment at 850 degrees C (Pt@NHCSΔT) with a Pt particle size of ca. 23 nm. Activity in the ORR was studied by rotating disc electrode (RDE) thin-film measurements, and electrocatalyst stability was evaluated by accelerated aging tests under simulated startstop conditions. The performance of the NHCS-based materials was compared to the two corresponding nitrogen-free materials as well as to a standard Pt/Vulcan catalyst. The underlying degradation mechanisms of Pt@NHCS materials were investigated via identical location electron microscopy. Our results conclusively show that nitrogen doping of the carbon supports can offer benefits for achieving high initial mass activities due to improved high platinum dispersion; however, it was not found to necessarily lead to an improvement of the catalyst stability.

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Language(s): eng - English
 Dates: 2014-09-082014
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1021/cs5003492
 Degree: -

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Title: ACS Catalysis
Source Genre: Journal
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Publ. Info: Washington, DC : ACS
Pages: - Volume / Issue: 4 (11) Sequence Number: - Start / End Page: 3856 - 3868 Identifier: ISSN: 2155-5435
CoNE: /journals/resource/2155-5435