Abstract
Semiconductor based photocatalytic water splitting is a promising technology to reduce humanity’s dependence on fossil fuels by converting solar energy to clean and sustainable H2 fuel. By building electric fields in the space charge region, electrons and holes will move to different locations on the surface and this will enhance the separation of charge and decrease the back reaction rates. Here, we report results optimizing the reactivity of Al:SrTiO3 and Fe:SrTiO3 by tailoring particle shape, particle size, dopant concentration and solution pH. We investigate this large parameter space using a newly developed high-throughput Parallelized and Automated Photochemical Reactor (PAPCR) that can measure the hydrogen generation rate of 108 samples in a single experiment. Additionally, we discuss a method to increase the surface area of SrTiO3 by using a TiO2 coating to improve the hydrogen production rate by 3 to 10 times. Our results show that tuning the electric fields in oxides is a promising strategy to improve the photocatalyst performance. Our results also demonstrate the potential of the PAPCR to increase the rate of catalyst development.
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