Self-assembled monolayer of a non-Pt oxygen electroreduction catalyst on metal oxide supports

Dominic F Gervasio, Jeffery Thomson

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

A self-assembled monolayer (SAM) of metallo porphyrins is intended as a replacement to platinum, in the hope of overcoming the slow oxygen reduction kinetics on Pt that limits fuel-cell efficiency to < 70% [1] and Pt- fouling by impurities. Metallo porphyrins can remedy the problems with Pt in oxygen cathodes [2] but these do not bind on electrode surfaces. A first step to stable catalyst monolayer.is to form a SAM of macrocycle on a current-collecting surface. A cobalt(II) porphyrin, Co1, was formed into a SAM on conductive indium tin oxide (ITO). Co1is attracted to ITO by a covalently attached phosphonate group[3]. Substantial oxygen electro reduction current was found with a SAM of Co1 on ITO compared to bare ITO in 0.01 M aqueous trifluoromethane sulfonic acid (TFMSA) with 1 atm oxygen over solution. The catalytic oxygen reduction current onset at 0.65 V and rose to a limiting current density of about 0.4 milliamp cm-2 at 0.1 V versus RHE. Oxygen reduction on Pt and the Co1 SAM on ITO in aqueous triflic acid in the presence and absence of methanol will be presented to illustrate that the Co1 on ITO is less susceptible to fouling than Pt.

Original languageEnglish (US)
Title of host publicationACS National Meeting Book of Abstracts
Volume232
StatePublished - 2006
Externally publishedYes
Event232nd American Chemical Society Meeting and Exposition - San Francisco, CA, United States
Duration: Sep 10 2006Sep 14 2006

Other

Other232nd American Chemical Society Meeting and Exposition
CountryUnited States
CitySan Francisco, CA
Period9/10/069/14/06

Fingerprint

Self assembled monolayers
Catalyst supports
Oxides
Metals
Oxygen
Catalysts
Porphyrins
Fouling
Organophosphonates
Sulfonic Acids
Cobalt
Platinum
Methanol
indium tin oxide
Fuel cells
Monolayers
Cathodes
Current density
Impurities
Electrodes

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

Gervasio, D. F., & Thomson, J. (2006). Self-assembled monolayer of a non-Pt oxygen electroreduction catalyst on metal oxide supports. In ACS National Meeting Book of Abstracts (Vol. 232)

Self-assembled monolayer of a non-Pt oxygen electroreduction catalyst on metal oxide supports. / Gervasio, Dominic F; Thomson, Jeffery.

ACS National Meeting Book of Abstracts. Vol. 232 2006.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Gervasio, DF & Thomson, J 2006, Self-assembled monolayer of a non-Pt oxygen electroreduction catalyst on metal oxide supports. in ACS National Meeting Book of Abstracts. vol. 232, 232nd American Chemical Society Meeting and Exposition, San Francisco, CA, United States, 9/10/06.
Gervasio DF, Thomson J. Self-assembled monolayer of a non-Pt oxygen electroreduction catalyst on metal oxide supports. In ACS National Meeting Book of Abstracts. Vol. 232. 2006
Gervasio, Dominic F ; Thomson, Jeffery. / Self-assembled monolayer of a non-Pt oxygen electroreduction catalyst on metal oxide supports. ACS National Meeting Book of Abstracts. Vol. 232 2006.
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