New composite DMFC anode with PEDOT as mixed conductor and catalyst support

GZ 205 (101/5)

Bild Forschungsprojekt
Laufzeit: 01.01.2004 - 31.12.2006 
Partner: Tianjin University, Prof. Yuxin Wang, China 
Geldgeber: Deutsche Forschungsgemeinschaft (DFG) 
Bearbeiter: Dr. Jean-Francois Drillet, Prof. Dr, Roland Dittmeyer, Prof. Dr. K. Jüttner
Arbeitsgruppe: Technische Chemie, Elektrochemie

Project description

The direct methanol fuel cell (DMFC) as electrochemical power source has attracted attention due to its simple system design, low operating temperature, and convenient fuel storage and supply. Major limitations of the DMFC are related to the low power density, which is a consequence of the poor kinetics of the anode reaction, poisoning of the catalyst by reaction intermediates, and methanol crossover. Research efforts have to address improvements of the anode catalyst structure and the ion-exchanger membrane.

This project aims at the development of a new type of membrane anode assembly PEM*/PEDOT/CAT based on the conducting polymer PEDOT (Poly(3,4–ethylene-dioxythiophene)) as catalyst support and a new type of proton-exchange membrane (PEM*) with reduced methanol permeability. As the catalyst (CAT)  Pt and Pt-Ru will be utilised. The new proton exchange membranes are to be made of thermal-stable polymers of arylide, so that they can be used in fuel cells working at higher temperatures (Tianjin University, China). Conventional Pt/C cathodes will be used for manufacturing the membrane electrode assemblies (MEAs) to be tested in single cell experiments.

The application of PEDOT as mixed electronic and ionic conductor is expected to improve the charge transfer kinetics and the transport of protons and electrons within the anode structure leading to a better utilisation of the noble metal catalyst.


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