Doping regulates pyro-photo-electric catalysis to achieve efficient water splitting in Ba1-xSrxTiO3 through solar energy and thermal resources

The use of renewable energies to produce hydrogen has been an important issue in recent years. In this paper, a Ba1-xSrxTiO3 photoelectrode is designed on the basis of temperature and light excitation, and the influence of doping on pyro-photo-electric catalysis is explored by changing the doping amount of Sr2+ ions. Under the conditions of 50 degrees C temperature, illumination and external bias voltage, the current density of Ba0.7Sr0.3TiO3 at 1.23 V vs. RHE is the highest, reaching 0.698 mA center dot cm(-2), which is significantly higher than the sum of photocurrent (0.427 mA center dot cm(-2)) and pyroelectric current (0.007 mA center dot cm(-2)). The main reason for the improvement of performance is that doping expands the response of semiconductors to visible light and the effect of a polarization built-in electric field. In this work, it is proposed to improve the pyro-photo-electric performance of the Ba1-xSrxTiO3 photoelectrode by changing the Sr2+ doping concentration, improve the separation and transfer efficiency of carriers, and provide a practical method for designing semiconductor photoelectrodes with excellent catalytic performance.

Automated summary

This study designs a Ba1-xSrxTiO3 photoelectrode by changing the doping concentration and explores the influence of doping on pyro-photo-electric catalysis. The results show that doping expands the response of the photoelectrode to visible light and enhances the effect of the built-in electric field, leading to improved catalytic performance.