Tandem cell for water cleavage by visible light
First Claim
1. A photoelectrochemical system for the cleavage of water to hydrogen and oxygen by visible light comprising first and second superimposed top and bottom photocells, the cells being connected electrically, a photoactive material in the top cell being a semiconducting oxide placed in contact with an aqueous solution, the oxide absorbing a blue and green part of the solar emission spectrum to generate oxygen and protons from water and transmitting a yellow and red part of the solar emission spectrum light to the bottom photocell mounted behind the top cell and composed of a sensitizer comprising a dye-sensitized porous photovoltaic film, said bottom cell converting the yellow and red parts and a near infrared part of the solar emission spectrum to drive the reduction of the protons, produced in the top cell during a photo catalytic water oxidation process, to hydrogen.
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Abstract
A tandem cell or photoelectrochemical system for the cleavage of water to hydrogen and oxygen by visible light has two superimposed photocells, both cells being connected electrically. The photoactive material in the top cell is a semiconducting oxide placed in contact with an aqueous solution. This semiconducting oxide absorbs the blue and green part of the solar emission spectrum of a light source or light sources and generates with the energy collected oxygen and protons from water. The not absorbed yellow and red light transmits the top cell and enters a second photocell, the bottom cell, which is mounted, in the direction of the light behind, preferably directly behind the top cell. The bottom cell includes a dye-sensitized mesoporous photovoltaic film. The bottom cell converts the yellow, red and near infrared portion of the sunlight to drive the reduction of the protons, which are produced in the top cell during the photo catalytic water oxidation process, to hydrogen.
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8 Claims
- 1. A photoelectrochemical system for the cleavage of water to hydrogen and oxygen by visible light comprising first and second superimposed top and bottom photocells, the cells being connected electrically, a photoactive material in the top cell being a semiconducting oxide placed in contact with an aqueous solution, the oxide absorbing a blue and green part of the solar emission spectrum to generate oxygen and protons from water and transmitting a yellow and red part of the solar emission spectrum light to the bottom photocell mounted behind the top cell and composed of a sensitizer comprising a dye-sensitized porous photovoltaic film, said bottom cell converting the yellow and red parts and a near infrared part of the solar emission spectrum to drive the reduction of the protons, produced in the top cell during a photo catalytic water oxidation process, to hydrogen.
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