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The dynamics of photopromoted electrons in BiVO 4 , WO 3 , and WO 3 /BiVO 4 heterojunction electrodes has been directly probed by transient absorption (TA) midinfrared (mid-IR) spectroscopy in the picosecond to microsecond time range. By comparison of the dynamics recorded with the two individual oxides at 2050 cm -1 with that of the heterojunction system after excitation at different wavelengths, electron-transfer processes between selectively excited BiVO 4 and WO 3 have been directly tracked for the first time. These results support the charge carrier interactions which were previously hypothesized by probing the BiVO 4 hole dynamics through TA spectroscopy in the visible range. Nanosecond mid-IR TA experiments confirmed that charge carrier separation occurs in WO 3 /BiVO 4 electrodes under visible-light excitation, persisting up to the microsecond time scale.

Photoinduced Charge-Transfer Dynamics in WO3/BiVO4 Photoanodes Probed through Midinfrared Transient Absorption Spectroscopy

Photoinduced Charge-Transfer Dynamics in WO₃/BiVO₄ Photoanodes Probed through Midinfrared Transient Absorption Spectroscopy