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Origin of the overall water splitting activity over Rh/Cr2O3@ anatase TiO2 following UV-pretreatment

Authors: 

Hanggara Sudrajat, Sandhya Babel, Sri Hartuti, Jakkapon Phanthuwongpakdee, Kritapas Laohhasurayotin, Truong K. Nguyen, Hien D.Tong

Source title: 
International Journal of Hydrogen Energy, 46(61): 31228-31238, 2021 (ISI)
Academic year of acceptance: 
2021-2022
Abstract: 

Anatase TiO2 has long been known to be one of the best photocatalysts. Its conduction band potential is thermodynamically allowed to drive a diverse range of photooxidation reactions. However, anatase TiO2 cannot oxidize water into oxygen in photocatalytic overall water splitting that involves multi-hole transfers. In the present study, a simple pretreatment of anatase TiO2 with highly-intense UV irradiation is demonstrated to enable overall water splitting upon loading with a Rh/Cr2O3 cocatalyst. Based on light-induced infrared absorption spectroscopy and time-resolved microwave conductivity, it is suggested that the efficient removal of deep hole traps permits free holes to possess a sufficiently strong oxidizing potential for water oxidation over Rh/Cr2O3@TiO2.