Parameters affecting the chemical work output of a hybrid photoelectrochemical biofuel cell

Michael Hambourger, Paul A. Liddell, John Devens Gust, Ana L Moore, Thomas A Moore

Research output: Contribution to journalArticle

39 Citations (Scopus)

Abstract

A hybrid photoelectrochemical biofuel cell employing the photoanode architecture of a dye-sensitized solar cell has been assembled. A porphyrin dye sensitizes a TiO2 semiconductor over the visible range to beyond 650 nm. Photoinduced charge separation at the dye-TiO2 interface results in electron migration to a cathode, and the holes generated on surface bound dyes oxidize soluble electron mediators. The increased [Ox] : [Red] ratio of the mediator drives the solution-based enzymatic oxidation of appropriate substrates. In this report we investigate how the accumulation of anodic and cathodic products limits cell performance. The NAD+/NADH and benzoquinone/hydroquinone redox couples were studied as sacrificial electron donors in the absence of appropriate enzymes or substrates. Comparatively poor cell performance was observed using the benzoquinone/hydroquinone couple. This effect is explained in terms of rapid charge recombination by electron donation from the electrode to benzoquinone in solution, as compared to much less recombination with NAD+. With the NAD+/NADH couple the cell performance is relatively independent of the redox poise of the anode solution, but limited by accumulation of reduction products in the cathodic compartment. Using the NAD+/NADH couple, the photochemical reforming of ethanol to hydrogen was demonstrated under conditions where the process would be endergonic in the dark.

Original languageEnglish
Pages (from-to)431-437
Number of pages7
JournalPhotochemical and Photobiological Sciences
Volume6
Issue number4
DOIs
Publication statusPublished - 2007

Fingerprint

Bioelectric Energy Sources
Biological fuel cells
NAD
quinones
dyes
output
cells
Coloring Agents
Electrons
electrons
Electrodes
compartments
polarization (charge separation)
Genetic Recombination
products
Oxidation-Reduction
porphyrins
enzymes
anodes
ethyl alcohol

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Cell Biology
  • Biochemistry, Genetics and Molecular Biology(all)
  • Biochemistry
  • Biophysics

Cite this

Parameters affecting the chemical work output of a hybrid photoelectrochemical biofuel cell. / Hambourger, Michael; Liddell, Paul A.; Gust, John Devens; Moore, Ana L; Moore, Thomas A.

In: Photochemical and Photobiological Sciences, Vol. 6, No. 4, 2007, p. 431-437.

Research output: Contribution to journalArticle

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