2:45 PM - 3:00 PM
△ [12p-D411-5] Correlation between photocatalytic activity of oxyhalide and photoconductivity measured by time-resolved microwave spectroscopy
Keywords:photocatalyst, water splitting, time-resolved microwave spectroscopy
Time-resolved microwave conductivity (TRMC) analysis has been utilized to investigate the photogenerated charge carrier dynamics and predict the power conversion efficiency of organic photovoltaics. This technique allows facile evaluation of the product of the quantum yield (φ) and the sum of charge carrier mobilities Σμ (= μ+ + μ–) without the need for fabricating the actual device, and is therefore applicable to photocatalysts in powder form. Several groups have reported the TRMC evaluation of oxide semiconductors, mainly focusing on TiO2 nanoparticles. However, the relationship between the TRMC photoconductivity (φΣμ) and the photocatalytic performance has not yet been fully understood. In this study, we report the correlation between the photocatalytic activity of oxyhalides with the kinetic parameters derived from the analysis of TRMC transients. These photocatalysts were synthesized at different calcination temperatures to comprehensively examine the crystallinity and stoichiometry (Cl/Bi ratio), as well as to validate such TRMC analysis as a robust tool providing a rapid approach to optimize the performance of photocatalysts.