Fine-Tuning the Photocatalytic Activity of the Anatase {1 0 1} Facet through Dopant-Controlled Reduction of the Spontaneously Present Donor State Density.

Analogical spectra were observed for all investigated samples, without qualitative differences; however, their relative intensity was clearly reduced together with the Gd concentration. Noteworthily, as presented in Figure 8 e, after considering the available surface area of each material, the estimated concentration of these species forms a clear trend with respect to Gd presence, which is in strict correlation with the determined donor densities.

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