Fig. 3: Optical performance and photocarrier dynamic analysis of TVCNMWCA-HEO.
From: Sustainable photocatalytic hydrogen peroxide production over octonary high-entropy oxide
a Valence band spectra of TVCNMWCA-HEO acquired by XPS and UPS. The red regions mark the intermediate band states formed by abundant oxygen vacancies. b Mott–Schottky plots at different frequencies of TVCNMWCA-HEO. c Schematic band structure diagram of TVCNMWCA-HEO determined from XPS, UPS, and M-S analysis. d Diffuse reflectance UV–vis spectra of the TVCNMWCA-HEO (inset: the digital photo of TVCNMWCA-HEO powder) e Transient absorption spectra at various time delays of TVCNMWCA-HEO powder after pumping at 550 nm. f Corresponding decay kinetics probed at 700 nm showing a slow recombination process because of the presence of IB. g The photoluminescence spectra of TVCNMWCA-HEO excited at 325 nm and fitted by Gaussian function, suggesting various possible transitions of TVCNMWCA-HEO; The black circles is the experiment result; the red line is the fitting result. h Three typical time-resolved photoluminescence decay curves of band-edge emission at 400 nm and visible emission at 560 nm and 700 nm. The experimentally obtained curves are fitted by two-component exponential decay curves (black solid line). These source data are provided as a Source Data file.
