Metal electrodes bonded on solid polymer electrolyte membranes (SPE)—V. methanol oxidation on Pt—SPE electrode

✍ Scribed by H. Nakajima; H. Kita

• Publisher: Elsevier Science
• Year: 1988
• Tongue: English
• Weight: 527 KB
• Volume: 33
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/0013-4686(88)80170-1

✦ Synopsis

Direct methanol oxidation from gas phase was studied on the PttSPE electrode. The voltammogram and the Tafel plots demonstrated that a Pt metal electrode in electrolyte solution and the present Pt-SPE electrode behave essentially in the same way for the methanol oxidation. The latter electrode, however, provided promising aspects that it produces ca. lo3 times larger oxidation current and does not show a deactivation phenomena over a few hour polarization. The burning efficiency of methanol was examined as functions of the potential and the partial pressures of methanol and water. An excess supply of methanol resulted in the production of HCOOCH3 to an amount almost equal to COI. At a low methanol pressure, the complete combustion took place independent of the potential. The strongly adsorbed species, the duration of the high activity and the reaction mechanism were briefly discussed.