Abstract

Abstract We applied pump-flow-probe X-ray absorption fine structure (PFP-XAFS) spectroscopy to photoexcited electron transfer from semiconductor to cocatalyst in a single atom(SA)-Pt/CoOOH photocatalyst to trace the process with microsecond (μs) time resolution. Upon photoirradiation, photoexcited electrons in the CoOOH semiconductor are found to transfer into Pt 5d orbitals, reaching a maximum population at 10 μs delay time. The accumulation of photoelectrons in the Pt 5d and the following decay process are reasonably explained by sequential first-order kinetics with rate constants of k1 = 0.11 ± 0.03 μs−1 and k2 = 0.06 ± 0.01 μs−1.

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