TY  - THES
A1  - Rost, Ulrich
T1  - Development and characterisation of carbon nano fibre based membrane electrode assemblies for PEM fuel cells
N2  - For this experimental work gas diffusion electrodes (GDE) with low platinum loading are prepared for the application as anodes in polymer electrolyte membrane fuel cells. As catalyst support material, carbon nano fibres (CNF) are investigated due to high specific surface area as well as high graphitisation degree. Optimisation is achieved by an economic and environmental friendly pre-treatment process in oxygen plasma. For electrode preparation an ink is used containing oxygen plasma activated CNFs as well as hydrophilic polymer. After spray coating of this CNF ink on a graphitic substrate, platinum is deposited by pulse plating method. Preliminary results established that the plasma activation improves considerably CNF dispersibility as well as the amount, respectively, the morphology of the deposited platinum. Morphology and microstructure are observed by electron microscopy. Platinum loading is determined by thermogravimetric analysis to be in the range of 0.010 to 0.016 mg cm-2. Furthermore, MEAs are prepared from these GDEs and testing is performed in a novel modular test stack based on hydraulic compression. Technical information about the test stack design and functions are given in this work. In this test environment maximum specific power output of 182 mW cm-2 has been obtained under robust operation conditions.
KW  - Polymer-Elektrolytmembran-Brennstoffzelle
KW  - Nanofaser
KW  - Kohlenstoff
KW  - PEM-Brennstoffzelle
KW  - Elektrodenvorbereitung
KW  - Sauerstoffplasmaaktivierung
KW  - PEM fuel cells
KW  - electrode preparation
KW  - carbon nano fibres
KW  - oxygen plasma activation
Y1  - 2015
UR  - https://whge.opus.hbz-nrw.de/frontdoor/index/index/docId/157
N1  - Veröffentlicht an der Universitatea Politehnica Timişoara, Rumänien
ER  -