Factors affecting the photoelectrochemical fixation of carbon dioxide with semiconductor colloids

Brian R. Eggins*, Peter K J Robertson, Eileen P. Murphy, Elaine Woods, John T S Irvine

*Corresponding author for this work

Research output: Contribution to journalArticle

55 Citations (Scopus)

Abstract

Carbon dioxide was reduced photocatalytically using aqueous CdS or ZnS colloids containing tetramethylammonium chloride to give the dimeric and tetrameric products namely, oxalate, glyoxylate, glycolate and tartrate. A model is presented to explain the role of the tetramethylammonium ions. Studies were also performed using ZnO, SiC, BaTiO3 and Sr TiO3, which in the absence of tetramethylammonium ions produced formate and formaldehyde. The relative quantum efficiencies of the six semiconductors were related to their band gaps and conduction band potentials. The role and effectiveness of several 'hole acceptor' (electron donor) compounds in this process is shown to be related to their redox potentials.

Original languageEnglish
Pages (from-to)31-40
Number of pages10
JournalJournal of Photochemistry and Photobiology A: Chemistry
Volume118
Issue number1
DOIs
Publication statusPublished - 15 Oct 1998

Keywords

  • Photochemical fixation
  • Semiconductor colloids
  • Tetramethylammonium ions

ASJC Scopus subject areas

  • Bioengineering
  • Physical and Theoretical Chemistry

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