Methanol oxidation on carbon-supported Pt-Ru and TiO_2 (Pt-Ru/TiO_2/C) electrocatalyst prepared using polygonal barrel-sputtering method

摘要

Methanol oxidation performance of a carbon-supported Pt-Ru alloy catalyst used at the direct methanol fuel cell (DMFC) anode is improved by adding TiO_2. However, the methanol oxidation performance of the electrocatalyst described above must be enhanced further to realize practical application in DMFCs. In this study, we used our original surface-modifying technique termed the "polygonal barrel-sputtering method" to prepare a carbon-supported Pt-Ru and TiO_2 (Pt-Ru/TiO_2/C) electrocatalyst offering higher methanol oxidation performance. The obtained results show that the methanol oxidation performance of the prepared Pt-Ru/TiO_2/C is superior to that using wet process as the TiO_2 deposition method. Furthermore, for our sputtering method, the peak current of methanol oxidation on the Pt-Ru/TiO_2/C is enhanced by increasing the TiO_2 deposited amount up to 2.8 wt.%. These results suggest that a Pt-Ru/TiO_2 interface area is increased using the polygonal barrel-sputtering method, providing the high methanol oxidation performance of Pt-Ru/TiO_2/C.