We developed an in situ observation system for photoinduced surface phenomena under ambient-pressure conditions based on conversion-electron-yield soft-X-ray absorption spectroscopy (CEY-SXAS). We applied this technique to in situ observation for photoinduced hole transfer in a highly efficient photocatalyst, Al-doped SrTiO3 (STO:Al), with cocatalysts, Rh/Cr2O3 for the hydrogen evolution reaction (HER) site and the CoOOH oxygen evolution reaction (OER) site. In situ Co L-edge CEY-SXAS measurements under saturated water vapor conditions revealed that UV–vis irradiation readily induces oxidation of Co in the CoOOH OER site, which provides evidence for photoinduced hole transfer from the STO:Al site to the OER site. Interestingly, without loading of the Rh/Cr2O3 HER site or without introducing water vapor, no photoinduced hole transfer to the CoOOH OER site was observed. Coexisting of the Rh/Cr2O3 HER site and water vapor on the STO:Al surface is crucial to the hole transfer to the OER site under photoirradiation.
No takes yet. Share an insight, caveat, or question.
Wang et al. (2024) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: