Fig. 3: Enhanced oxygen adsorption by photoreduction formed anion radical intermediate.
From: A photocatalytic redox cycle over a polyimide catalyst drives efficient solar-to-H2O2 conversion
a Experimental in situ FTIR spectra and (b) The peak intensity of O2 adsorption recorded during photoreaction in a 2-propanol aqueous solution with saturated oxygen (2-propanol as electron donor, 10% v/v). c In situ Raman spectra of the PI-BD-TPB aerogel recorded during photoreaction in a 2-propanol aqueous solution with saturated oxygen, a 785 nm laser was taken as light source to shine directly on the photocatalyst surface, and a computer synchronously collected the Raman signals. d Different adsorption site a of O2 on -C = O state (BD-TPB) and radical anion state (BD-TPB*) respectively. e The adsorption energy of O2 on different sites of C = O state (BD-TPB) and radical anion state (BD-TPB*), respectively.
