title: Porphyrin-sensitized nanoparticulate TiO2 as the photoanode of a hybrid photoelectrochemical biofuel cell.
abstract: Porphyrin-sensitized nanoparticulate TiO(2) on conducting glass has been investigated as a photoanode material for a new cell that converts light energy into electricity. The cell is a hybrid of a dye-sensitized nanoparticulate semiconductor photoelectrochemical solar cell, and a biofuel cell that oxidizes glucose. Porphyrin molecules excited by light inject electrons into the photoanode, from where they enter the external circuit. The resulting porphyrin radical cations are reduced by NADH in aqueous buffer, ultimately regenerating the photoanode and producing NAD(+). Glucose dehydrogenase oxidizes glucose, and in the process recycles NAD(+) back to NADH. The photoanode is coupled with a suitable cathode to make a functioning cell (Hg/Hg(2)SO(4) was employed for evaluation purposes). The cell produces 1.1 V at open circuit and has a fill factor of 0.61. These values are both significantly higher than those for a previously reported cell of a similar type based on an SnO(2) electrode.
authors.affiliation: Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287-1604, USA.
authors.forename: Alicia
authors.initials: A
authors.lastname: Brune
authors.forename: Goojin
authors.initials: G
authors.lastname: Jeong
authors.forename: Paul A
authors.initials: PA
authors.lastname: Liddell
authors.forename: Tadashi
authors.initials: T
authors.lastname: Sotomura
authors.forename: Thomas A
authors.initials: TA
authors.lastname: Moore
authors.forename: Ana L
authors.initials: AL
authors.lastname: Moore
authors.forename: Devens
authors.initials: D
authors.lastname: Gust
mesh_terms: D004563:Electrochemistry; D004566:Electrodes; D005947:Glucose / Q000737:chemistry; D042843:Glucose 1-Dehydrogenase / Q000737:chemistry; D015394:Molecular Structure; D009243:NAD / Q000138:chemical synthesis / Q000737:chemistry; D049329:Nanostructures / Q000737:chemistry*; D010084:Oxidation-Reduction; D010316:Particle Size; D010777:Photochemistry; D011166:Porphyrins / Q000737:chemistry*; D012680:Sensitivity and Specificity; D013499:Surface Properties; D013997:Time Factors; D014025:Titanium / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D011166:Porphyrins; D009243:NAD; C009495:titanium dioxide; D014025:Titanium; D042843:Glucose 1-Dehydrogenase; D005947:Glucose