ABSTRACT
Photosynthesis is a sustainable process that converts light energy into chemical energy. Substantial research efforts are directed towards the application of the photosynthetic reaction centres, photosystems I and II, as active components for the light-induced generation of electrical power or fuel products. Nonetheless, no integrated photo-bioelectrochemical device that produces electrical power, upon irradiation of an aqueous solution that includes two inter-connected electrodes is known. Here we report the assembly of photobiofuel cells that generate electricity upon irradiation of biomaterial-functionalized electrodes in aqueous solutions. The cells are composed of electrically contacted photosystem II-functionalized photoanodes and an electrically wired bilirubin oxidase/carbon nanotubes-modified cathode. Illumination of the photoanodes yields the oxidation of water to O(2) and the transfer of electrons through the external circuit to the cathode, where O(2) is re-reduced to water.
Subject(s)
Bioelectric Energy Sources , Light , Photosynthesis , Photosystem II Protein Complex/metabolism , Benzoquinones/chemistry , Benzoquinones/metabolism , Cyanobacteria/enzymology , Cyanobacteria/metabolism , Electricity , Electrodes , Nanotubes, Carbon/analysis , Nanotubes, Carbon/chemistry , Oxidation-Reduction , Oxidoreductases Acting on CH-CH Group Donors/chemistry , Oxidoreductases Acting on CH-CH Group Donors/metabolism , Photosystem II Protein Complex/chemistry , Polymers/chemistry , Polymers/metabolismABSTRACT
The photocurrents generated by a monolayer consisting of a CdS nanoparticles/acetylcholine esterase hybrid system associated with an electrode are controlled by the enzyme inhibitors.
Subject(s)
Acetylcholinesterase/chemistry , Biosensing Techniques/methods , Cadmium Compounds/chemistry , Cholinesterase Inhibitors/analysis , Enzymes, Immobilized/chemistry , Sulfides/chemistry , Acetylcholinesterase/metabolism , Electrochemistry/methods , Electrodes , Enzymes, Immobilized/metabolism , Particle Size , Photochemistry/methodsABSTRACT
Magnetic-field-stimulated 'ON' and 'OFF' biochemiluminescence is accomplished by electrocatalyzed reduction of naphthoquinone-functionalized magnetic particles in the presence of a biocatalytic peroxidase/luminol system.
