Fig. 4: Spectroscopic analysis of catalytic mechanism.

The desorption behavior of a CO over Rh/GaN and Rh/GaN1–xOx-250 by TPD. b In situ DRIFT spectra of Rh/GaN1–xOx-250, ¶: from room temperature to 260 °C; §: keeping 260 °C.

The desorption behavior of a CO over Rh/GaN and Rh/GaN1–xOx-250 by TPD. b In situ DRIFT spectra of Rh/GaN1–xOx-250, ¶: from room temperature to 260 °C; §: keeping 260 °C.