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A novel electrocatalyst support with proton conductive properties for polymer electrolyte membrane fuel cell applications

Carmo, Marcelo and Roepke, Thorsten and Roth, Christina and dos Santos, Amilton M. and Poco, Joao G. R. and Linardi, Marcelo (2009):
A novel electrocatalyst support with proton conductive properties for polymer electrolyte membrane fuel cell applications.
In: Journal of Power Sources, 191 (2), Elsevier Science Publishing Company, pp. 330-337, ISSN 03787753,
[Online-Edition: http://dx.doi.org/10.1016/j.jpowsour.2009.01.086],
[Article]

Abstract

The objective of this study is to graft the surface of carbon black, by chemically introducing polymeric chains (Nafion® like) with proton-conducting properties. This procedure aims for a better interaction of the proton-conducting phase with the metallic catalyst particles, as well as hinders posterior support particle agglomeration. Also loss of active surface can be prevented. The proton conduction between the active electrocatalyst site and the Nafion® ionomer membrane should be enhanced, thus diminishing the ohmic drop in the polymer electrolyte membrane fuel cell (PEMFC). PtRu nanoparticles were supported on different carbon materials by the impregnation method and direct reduction with ethylene glycol and characterized using amongst others FTIR, XRD and TEM. The screen printing technique was used to produce membrane electrode assemblies (MEA) for single cell tests in H2/air (PEMFC) and methanol operation (DMFC). In the PEMFC experiments, PtRu supported on grafted carbon shows 550 mW cm−2 gmetal−1 power density, which represents at least 78% improvement in performance, compared to the power density of commercial PtRu/C ETEK. The DMFC results of the grafted electrocatalyst achieve around 100% improvement. The polarization curves results clearly show that the main cause of the observed effect is the reduction in ohmic drop, caused by the grafted polymer.

Item Type: Article
Erschienen: 2009
Creators: Carmo, Marcelo and Roepke, Thorsten and Roth, Christina and dos Santos, Amilton M. and Poco, Joao G. R. and Linardi, Marcelo
Title: A novel electrocatalyst support with proton conductive properties for polymer electrolyte membrane fuel cell applications
Language: English
Abstract:

The objective of this study is to graft the surface of carbon black, by chemically introducing polymeric chains (Nafion® like) with proton-conducting properties. This procedure aims for a better interaction of the proton-conducting phase with the metallic catalyst particles, as well as hinders posterior support particle agglomeration. Also loss of active surface can be prevented. The proton conduction between the active electrocatalyst site and the Nafion® ionomer membrane should be enhanced, thus diminishing the ohmic drop in the polymer electrolyte membrane fuel cell (PEMFC). PtRu nanoparticles were supported on different carbon materials by the impregnation method and direct reduction with ethylene glycol and characterized using amongst others FTIR, XRD and TEM. The screen printing technique was used to produce membrane electrode assemblies (MEA) for single cell tests in H2/air (PEMFC) and methanol operation (DMFC). In the PEMFC experiments, PtRu supported on grafted carbon shows 550 mW cm−2 gmetal−1 power density, which represents at least 78% improvement in performance, compared to the power density of commercial PtRu/C ETEK. The DMFC results of the grafted electrocatalyst achieve around 100% improvement. The polarization curves results clearly show that the main cause of the observed effect is the reduction in ohmic drop, caused by the grafted polymer.

Journal or Publication Title: Journal of Power Sources
Volume: 191
Number: 2
Publisher: Elsevier Science Publishing Company
Uncontrolled Keywords: Polystyrene sulphonic, Graft, Carbon support, Electrocatalyst, Fuel cell
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Erneuerbare Energien
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 22 Feb 2013 08:54
Official URL: http://dx.doi.org/10.1016/j.jpowsour.2009.01.086
Identification Number: doi:10.1016/j.jpowsour.2009.01.086
Funders: The authors thank the “Instituto de Pesquisas Tecnológicas do Estado de São Paulo – IPT”, the “Instituto de Pesquisas Energéticas e Nucleares - IPEN”,, the “Coordenadoria de Aperfeicoamento Pessoal – CAPES”, the “Financiadora de Estudos e Projetos - FINEP”, the “Deutsche Akademische Austauschdienst – DAAD”,, the “Technische Universität Darmstadt”, and the Hydrogen Institute of Applied Technologies – HIAT GmbH for financial assistance given to this project.
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