Historical Overview
In the late 1960s, one of the present authors (AF) began to investigate the photoelectrolysis of water, using a single crystal TiO2 electrode. Then, the first report on the efficient production of hydrogen from water by TiO2 photocatalysis was published in Nature in 1972, at the time of the “oil crisis” [1]. Thus, TiO2 photocatalysis drew the attention of many people as one of the promising methods to obtain this new energy source. However, even though the reaction efficiency is very high, TiO2 can absorb only the UV light contained in solar light, which is only about 3 %. Therefore, from the viewpoint of hydrogen production technology, TiO2 photocatalysis is not very attractive. Instead, research shifted in the 1980s to the utilization of the strong photoproduced oxidation power of TiO2 for the decomposition of various contaminants in both water and air. In this case, the holes (h+) generated in TiO2were highly oxidizing, and most contaminants were essentially...
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References
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Ochiai, T., Fujishima, A. (2014). Photoelectrochemical Disinfection of Air (TiO2). In: Kreysa, G., Ota, Ki., Savinell, R.F. (eds) Encyclopedia of Applied Electrochemistry. Springer, New York, NY. https://doi.org/10.1007/978-1-4419-6996-5_129
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