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  Toward Highly Stable Electrocatalysts via Nanoparticle Pore Confinement

Galeano Nunez, D. C., Meier, J. C., Peinecke, V., Bongard, H.-J., Katsounaros, I., Topalov, A. A., et al. (2012). Toward Highly Stable Electrocatalysts via Nanoparticle Pore Confinement. Journal of the American Chemical Society, 134(50), 20457-20465. doi:10.1021/ja308570c.

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 Creators:
Galeano Nunez, Diana Carolina1, Author              
Meier, Josef C. 2, Author
Peinecke, Volker3, Author
Bongard, Hans-Josef4, Author              
Katsounaros, Ionnis2, Author
Topalov, Angel A.2, 5, Author
Lu, A.H.6, Author
Mayrhofer, Karl J. J. 2, Author
Schüth, Ferdi1, Author              
Affiliations:
1Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society, D-45470 Mülheim an der Ruhr, ou_1445589              
2Max Planck Inst Eisenforsch GmbH, Dept Interface Chem & Surface Engn, D-40237 Dusseldorf, Germany, ou_persistent22              
3Fuel Cell Res Ctr ZBT GmbH, D-47057 Duisburg, Germany, ou_persistent22              
4Service Department Lehmann (EMR), Max-Planck-Institut für Kohlenforschung, Max Planck Society, D-45470 Mülheim an der Ruhr, ou_1445625              
5Ruhr Univ Bochum, Ctr Electrochem Sci, D-44780 Bochum, Germany, ou_persistent22              
6Dalian Univ Technol, State Key Lab Fine Chem, Dalian 116024, Peoples R China , ou_persistent22              

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Free keywords: OXYGEN REDUCTION REACTION; MEMBRANE FUEL-CELL; CATHODE CATALYST SUPPORT; MESOPOROUS CARBONS; ELECTROLYTE; PLATINUM; DEGRADATION; TEMPERATURE; DURABILITY; NANOCATALYSTS
 Abstract: The durability of electrode materials is a limiting parameter for many electrochemical energy conversion systems. In particular, electrocatalysts for the essential oxygen reduction reaction (ORR) present some of the most challenging instability issues shortening their practical lifetime. Here, we report a mesostructured graphitic carbon support, Hollow Graphitic Spheres (HGS) with a specific surface area exceeding 1000 m(2) g(-1) and precisely controlled pore structure, that was specifically developed to overcome the long-term catalyst degradation, while still sustaining high activity. The synthetic pathway leads to platinum nanoparticles of approximately 3 to 4 nm size encapsulated in the HGS pore structure that are stable at 850 degrees C and, more importantly, during simulated accelerated electrochemical aging. Moreover, the high stability of the cathode electrocatalyst is also retained in a fully assembled polymer electrolyte membrane fuel cell (PEMFC). Identical location scanning and scanning transmission electron microscopy (IL-SEM and IL-STEM) conclusively proved that during electrochemical cycling the encapsulation significantly suppresses detachment and agglomeration of Pt nanoparticles, two of the major degradation mechanisms in fuel cell catalysts of this particle size. Thus, beyond providing an improved electrocatalyst, this study describes the blueprint for targeted improvement of fuel cell catalysts by design of the carbon support.

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Language(s): eng - English
 Dates: 2012-12-19
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1021/ja308570c
 Degree: -

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Title: Journal of the American Chemical Society
  Other : J. Am. Chem. Soc.ABBREVIATION
Source Genre: Journal
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Publ. Info: Washington, DC : AMER CHEMICAL SOC, 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
Pages: - Volume / Issue: 134 (50) Sequence Number: - Start / End Page: 20457 - 20465 Identifier: ISSN: 0002-7863
CoNE: https://pure.mpg.de/cone/journals/resource/954925376870