Abstract
Improvement of the activity of the oxygen reduction reaction (ORR) at a polymer electrolyte fuel cell (PEFC) cathode is one of the serious problems to widespread PEFCs. We focused on Rh- or Pd-doped titanate nanosheets (TiNSs) to form the appropriate electron conduction path using tunneling effect of electrons and high quality active sites with Rh or Pd doping. To apply the tunneling effect of electrons to TiNSs, TiNSs were attempted to be supported on vapor growth carbon fiber (VGCF) with a large diameter. The surface of the VGCF was modified by poly (diallyl dimethylammonium) chloride (PDDA) as polycation because the TiNSs were anionic. The electrostatic interaction improved slightly the contact between the PDDA modified VGCF and the TiNSs to increase the ORR activity of the TiNSs. Rh- or Pd-added TiNSs were successfully synthesized via the solid phase method and ionic exchange reaction processes.1 atomic % addition of Rh and Pd was found to be effective to enhance the ORR activity of the TiNSs.
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