Abstract
The splitting of liquid water into hydrogen and water via photoelectrochemical (PEC) approaches is described. If sunlight is used as the illumination source, the overall process provides a means to convert solar power into chemical energy. PEC water splitting is the direct coupling of the following processes: (1) absorption of solar light in a material and the creation of electrons and holes, (2) transport of electrons and holes to the absorber/water interface, and (3) evolution of hydrogen from the electrons and oxygen from the holes, often with the assistance of catalysts. The distinctions between this process and the related approach of coupling photovoltaic (PV) elements to hydrogen evolution (HER) and oxygen evolution (OER) catalysts will be discussed. The history of research on PEC water splitting dating back to its discovery in the early 1970s is summarized. The basic design principles of PEC water splitting device, with an emphasis on the type and number of PV absorbing elements are discussed and state of the art demonstrations are summarized.
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Acknowledgments
This work was supported by the Joint Center for Artificial Photosynthesis, a DOE Energy Innovation Hub, supported through the Office of Science of the U.S. Department of Energy under Award Number DE-SC0004993.
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Ager, J.W. (2016). Photoelectrochemical Approach for Water Splitting. In: Sugiyama, M., Fujii, K., Nakamura, S. (eds) Solar to Chemical Energy Conversion. Lecture Notes in Energy, vol 32. Springer, Cham. https://doi.org/10.1007/978-3-319-25400-5_15
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