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

@article{citeulike:3063854, abstract = {A hybrid photoelectrochemical biofuel cell employing the photoanode architecture of a dye-sensitized solar cell has been assembled. A porphyrin dye sensitizes a TiO(2) semiconductor over the visible range to beyond 650 nm. Photoinduced charge separation at the dye-TiO(2) 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.}, address = {The Center for the Study of Early Events in Photosynthesis, Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287-1604, USA.}, author = {Hambourger, M. and Liddell, P. A. and Gust, D. and Moore, A. L. and Moore, T. A.}, citeulike-article-id = {3063854}, citeulike-linkout-0 = {http://dx.doi.org/10.1039/b616444g}, citeulike-linkout-1 = {http://view.ncbi.nlm.nih.gov/pubmed/17404638}, citeulike-linkout-2 = {http://www.hubmed.org/display.cgi?uids=17404638}, doi = {10.1039/b616444g}, issn = {1474-905X}, journal = {Photochemical \& photobiological sciences : Official journal of the European Photochemistry Association and the European Society for Photobiology}, keywords = {biofuel, biofuel-cell, photosynthesis, solar-energy}, month = {April}, number = {4}, pages = {431--437}, posted-at = {2008-07-30 18:33:00}, priority = {2}, title = {Parameters affecting the chemical work output of a hybrid photoelectrochemical biofuel cell.}, url = {http://dx.doi.org/10.1039/b616444g}, volume = {6}, year = {2007} }

TY - JOUR ID - citeulike:3063854 L3 - citeulike-article-id:3063854 N2 - A hybrid photoelectrochemical biofuel cell employing the photoanode architecture of a dye-sensitized solar cell has been assembled. A porphyrin dye sensitizes a TiO(2) semiconductor over the visible range to beyond 650 nm. Photoinduced charge separation at the dye-TiO(2) 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. IS - 4 JF - Photochemical & photobiological sciences : Official journal of the European Photochemistry Association and the European Society for Photobiology SN - 1474-905X AD - The Center for the Study of Early Events in Photosynthesis, Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287-1604, USA. EP - 437 TI - Parameters affecting the chemical work output of a hybrid photoelectrochemical biofuel cell. VL - 6 SP - 431 KW - biofuel KW - biofuel-cell KW - photosynthesis KW - solar-energy AU - Hambourger, M AU - Liddell, PA AU - Gust, D AU - Moore, AL AU - Moore, TA PY - 2007/04// UR - http://dx.doi.org/10.1039/b616444g ER -