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

作者：Drillet J F^*; Dittmeyer R; Juettner K; Li L; Mangold K M

来源：Fuel Cells, 2006, 6(6): 432-438.

DOI：10.1002/fuce.200500243

• catalyst support
• conducting polymer
• DMFC
• over-oxidation
• PEDOT
• PEDOT-PSS

The conducting polymer PEDOT is tested as a carbon substitute material for the DMFC anode. Electrochemical experiments are carried out in a three-electrode half-cell at room temperature. The first part of this paper focuses on the characterization of PEDOT and PEDOT-PSS as a diffusion layer material. PEDOT/C cyclic voltammograms are recorded in 1 M H2SO4 in the range between the hydrogen evolution and polymer over-oxidation potentials. The incorporation of the PSS counter-ion into the polymer matrix leads to higher impedance values compared to PEDOT without PSS. The second part deals with the study of PEDOT as a Pt catalyst support. It is found that the partial over-oxidation of PEDOT enhances the activity of Pt for methanol oxidation. This can be explained by a change in the morphology of PEDOT that probably improves methanol diffusion within the reaction layer. The degradation of the conducting polymer is confirmed by SEM, EDX, and FTIR measurements.

• 出版日期2006-12