Photoelectrolysis of water: Solar hydrogen-achievements and perspectives

Thermodynamic analysis of energy conversion from light-to- chemical, light-to-electric and electric-to-chemical is presented by the case study of water photoelectrolysis on TiO2 surface. It is demonstrated that at the current state-of-the-art energy conversion efficiency of water photoelectrolysis can be increased similar to 17 times by separating the processes of solar-to-electric and electric-to-chemical energy conversion and optimizing them independently. This allows to mitigate a high overvoltage of oxygen evolution reaction with respect to thermodynamic E-O2/H2O(0) = 1.23 V potential as well as spectrally narrow absorbtivity of solar light by TiO2 which determine the low efficiency (similar to 1.0%) of direct light-to-chemical energy conversion. Numerical estimates are provided illustrating practical principles for optimization of the solar energy conversion and storage processes. (C) 2010 Optical Society of America