Doping regulates pyro-photo-electric catalysis to achieve efficient water splitting in Ba1−xSrxTiO3 through solar energy and thermal resources. (30th August 2022)

• Record Type: Journal Article
• Authors: Liu, Simeng; Liu, Zhifeng; Meng, Yue
• Is Part Of: New journal of chemistry. Volume 46:Number 36(2022)
• Page Start: 17292
• Page End: 17302
• Publication Date: 2022-08-30
• Subjects: Chemistry -- Periodicals; Chimie -- Périodiques; 540
• DOI: 10.1039/d2nj02254k
• Languages: English
• ISSNs: 1144-0546

Abstract

Abstract : The effect of Sr 2+ doping concentration in Ba1− x Sr x TiO3 photoelectrodes on pyro-photo-electric catalysis was discussed. The main reason for the performance improvement is that doping broadens the response range of the semiconductor to visible light. Abstract : The use of renewable energies to produce hydrogen has been an important issue in recent years. In this paper, a Ba1− x Sr x TiO3 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 Sr 2+ ions. Under the conditions of 50 °C temperature, illumination and external bias voltage, the current density of Ba0.7 Sr0.3 TiO3 at 1.23 V vs. RHE is the highest, reaching 0.698 mA·cm −2, which is significantly higher than the sum of photocurrent (0.427 mA·cm −2 ) and pyroelectric current (0.007 mA·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− x Sr x TiO3 photoelectrode by changing the Sr 2+ doping concentration, improve the separation and transfer efficiency of carriers, and provide a practical method for designing semiconductor photoelectrodes with excellent catalytic performance.