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

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Photochemical & Photobiological Sciences Vol - 6 Issue - 3

Photochemical & Photobiological Sciences Vol - 6 Issue - 2

Photochemical & Photobiological Sciences Vol -5

Photochemical & Photobiological Sciences Vol -4

Photochemical & Photobiological Sciences Vol -3

Photochemical & Photobiological Sciences Vol -2

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

Content Provider	Royal Society of Chemistry (RSC)
Author	Moore, Thomas A. Liddell, Paul A. Hambourger, Michael Moore, Ana L. Gust, Devens
Copyright Year	2007
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.
Starting Page	431
Ending Page	437
Page Count	7
File Format	HTM / HTML PDF
ISSN	1474905X
Volume Number	6
Issue Number	4
Journal	Photochemical & Photobiological Sciences
DOI	10.1039/b616444g
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Subscribed
Subject Keyword	Dye-sensitized solar cell Semiconductor Electrode Anode Ethanol Cathode Hydrogen Carrier generation and recombination Redox Biofuel Benzoquinone Hydroquinone Dye Endergonic reaction Porphyrin Photoelectrochemical cell Nicotinamide adenine dinucleotide Photochemistry
Content Type	Text
Resource Type	Article
Subject	Physical and Theoretical Chemistry

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