fig14
![Solid-state NMR of active sites in TiO<sub>2</sub> photocatalysis: a critical review](https://image.oaes.cc/aee4ec06-4c22-4959-90f1-d08b90ca3a45/cs4012.fig.14.jpg)
Figure 14. 13C MAS NMR spectra of various C-doped TiO2 samples (Right). Proposed hole and electron transfer mechanism in the C-doped TiO2 photocatalyst (Left). Reproduced with permission from[190]. Copyright 2018, American Chemical Society. MAS: Magic angle spinning; NMR: nuclear magnetic resonance.