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Biological photovoltaics
Biological photovoltaics (BPV) is an energy-generating technology which uses oxygenic photoautotrophic organisms, or fractions thereof, to harvest light energy and produce electrical power.〔 Biological photovoltaic devices are a type of biological electrochemical system, or microbial fuel cell, and are sometimes also called photo-microbial fuel cells or “living solar cells”. In a biological photovoltaic system, electrons generated by photolysis of water are transferred to an anode.〔 A relatively high-potential reaction takes place at the cathode, and the resulting potential difference drives current through an external circuit to do useful work. It is hoped that using a living organism (which is capable of self-assembly and self-repair) as the light harvesting material, will make biological photovoltaics a cost-effective alternative to synthetic light-energy-transduction technologies such as silicon-based photovoltaics.
==Principle of operation==
Like other fuel cells, biological photovoltaic systems are divided into anodic and cathodic half-cells.
Oxygenic photosynthetic biological material, such as purified photosystems or whole algal or cyanobacterial cells, are employed in the anodic half-cell. These organisms are able to use light energy to drive the oxidation of water, and a fraction of the electrons produced by this reaction are transferred to the extracellular environment, where they can be used to reduce an anode. No heterotrophic organisms are included in the anodic chamber - electrode reduction is performed directly by the photosynthetic material.
The higher electrode potential of the cathodic reaction relative to the reduction of the anode drives current through an external circuit. In the illustration, oxygen is being reduced to water at the cathode, though other electron acceptors can be used. If water is regenerated there is a closed loop in terms of electron flow (similar to a conventional photovoltaic system), i.e. light energy is the only net input required for production of electrical power. Alternatively, electrons can be used at the cathode for electrosynthetic reactions that produce useful compounds, such as the reduction of protons to hydrogen gas.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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