Carbon dioxide reduction at pyrite photoelectrodes for solar fuel production

Amanda J. Morris, Andrew Bruce Bocarsly

Research output: Contribution to journalConference articlepeer-review

Abstract

Current carbon mitigation techniques favor sequestration in underground wells. Perhaps more useful is the conversion of carbon dioxide into a value added product. Herein, we demonstrate the reduction of carbon dioxide to formic acid and methanol at pyrite photoelectrodes. In the dark, pyrite exhibits metallic behavior due to the inherent dopants present in natural pyrite crystals. Under visible illumination, the catalytic waves observed by cyclic voltammetry shift in the positive direction on an electrochemical scale compared to dark electrodes. Therefore, the overpotential for reactivity is decreased by light absorption. The pyrite surface is stabilized in the presence of CO2, while under an Ar atmosphere a black film, investigated with XPS, resulted. The Faradaic efficiencies for products observed by NMR were determined as a function of illumination wavelength and applied potential.

Original languageEnglish (US)
JournalACS National Meeting Book of Abstracts
StatePublished - Aug 25 2011
Event241st ACS National Meeting and Exposition - Anaheim, CA, United States
Duration: Mar 27 2011Mar 31 2011

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)

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