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Catalytic performance of acid-treated multi-walled carbon nanotube-supported platinum catalyst for PEM fuel cells
Authors:Se Hoon Kim  Tae Kyu Lee  Ju Hae Jung  Jin Nam Park  Jun Bom Kim  Seung Hyun Hur
Affiliation:1. School of Chemical Engineering and Bioengineering, University of Ulsan, Daehak-ro 102, Nam-gu, Ulsan 680-749, Republic of Korea;2. Department of New and Renewable Energy, Kyungil University, Gamasigil 20, Hayang, Kyungsan, Kyungsangbuk-Do 712-701, Republic of Korea;1. Fuel Cell System and Engineering Laboratory, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, Liaoning 116023, China;2. Graduate University of Chinese Academy of Sciences, Beijing 100049, China;1. National Research Center “Kurchatov Institute”, Kurchatov Sq. 1, 123182 Moscow, Russia;2. Institut de Chimie Moléculaire et des Matériaux, UMR CNRS n° 8182, Université Paris Sud 11, bât 410, 91405 Orsay Cedex, France;1. Sabanci University, Nanotechnology Research and Application Center (SUNUM), 34956, Istanbul, Turkey;2. Sabanci University, Faculty of Engineering & Natural Sciences, 34956, Istanbul, Turkey;1. Research Institute for Precious Metals and Metal Chemistry (fem), Katharinenstr. 17, 73525 Schwaebisch Gmünd, Germany;2. The Fuel Cell Research Center, Carl-Benz-Str. 201, 47057 Duisburg, Germany;3. Department of Physical Chemistry, Saarland University, Campus B2.2, 66123 Saarbruecken, Germany;4. Acad. Evgeni Budevski Institute of Electrochemistry and Energy Systems, Bulgarian Academy of Sciences, Acad. G. Bonchev str., bl. 10, 1113 Sofia, Bulgaria;1. Nano Functional Materials Lab., Laser Materials Section, Raja Ramanna Centre for Advanced Technology, Indore 452013, India;2. Department of Energy Science and Engineering, Indian Institute of Technology Bombay, Mumbai, India
Abstract:Effects of the surface functional groups of multi-walled carbon nanotubes (MWCNTs) as catalyst support for the durability of polymer electrolyte membrane fuel cells (PEMFCs) were examined at high Pt loading conditions. The amount of oxygen functional groups on the MWCNTs surface was increased as the acid treatment time and temperature increased. We found that more functional groups in MWCNTs improved initial Pt dispersion but deteriorated durability due to the reduced carbon corrosion resistance. The experimental results also showed that despite the surface oxidation, Pt/MWCNT catalysts showed highly improved durability than Pt/C catalysts due to the graphitic nature of MWCNTs. Membrane electrode assembly (MEA) fabricated by 4 h acid treated MWCNTs at 25 °C showed 4 times better durability than commercial Pt/C based MEA at the reverse potential operation generated by fuel starvation conditions. We believe that MWCNTs can be effectively used for PEMFCs even at high loading due to their excellent anti-corrosion properties.
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