Summary
The present work introduces photo-fuel-cells (PFCs) as an alternative means of solar energy conversion with simultaneous degradation of water soluble wastes. A PFC takes the structure of a standard photoelectrochemical cell. The photoanode carries the photocatalyst, which is a nanostructured oxide semiconductor, typically, nanoparticulate titania combined with a quantum dot sensitizer, which provides functionality in the Visible. Only medium bandgap semiconductors like CdS or combined CdS-ZnS may act as sensitizers. Low bandgap semiconductors like CdSe or PbS cannot be employed as sensitizers because of their low oxidation capacity that affects the oxidation capacity of the combined photocatalyst. This is important since the PFC functions by photocatalytic degradation of the fuel and its functionality is preserved, thanks to the sacrifice of the fuel. The principal function of the PFC is to produce electricity; however, it may also be used to produce solar fuels, for example, hydrogen. In that case, the cell functions only under bias. When it is operated to solely produce electricity, then the cathode electrode must be aerated. The present work is a short review of our recent experience in the study of photo-fuel-cells and proposes some measures for the improvement of their performance.
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Acknowledgements
This research has been co-financed by the European Union (European Social Fund—ESF) and Greek national funds through the Operational Program “Education and Lifelong Learning” of the National Strategic Reference Framework (NSRF)—Research Funding Program: Thales. MIS379320. Investing in knowledge society through the European Social Fund.
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Antoniadou, M., Lianos, P. (2014). Photo-Fuel-Cells: An Alternative Route for Solar Energy Conversion. In: Viswanathan, B., Subramanian, V., Lee, J. (eds) Materials and Processes for Solar Fuel Production. Nanostructure Science and Technology, vol 174. Springer, New York, NY. https://doi.org/10.1007/978-1-4939-1628-3_7
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