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. 2023 Jun 23;13(13):1919. doi: 10.3390/nano13131919

Figure 6.

Figure 6

(a) Possible mechanisms for the reduction of the TiO2 nanotubes via an electrochemical process. Reproduced with permission [68]. Copyright: 2018, Royal Society of Chemistry. (b) Schematic illustrating the energetic differences between hematite {012} and hematite {001}. Reproduced with permission [71]. Copyright: 2016, Royal Society of Chemistry. The atomic structures of •OH adsorption on twinning W atoms of (c) {010} facet, (d) {100} facet, and (e) {001} facet. The values at the bottom are their corresponding adsorption energy. The white and red spheres represent the hydrogen and oxygen atoms, respectively. (f) EPR detection of OH using DMPO as a spin–trapping agent under 30 s illumination in the presence of WO3NB, WO3NP, and WO3NF. (g) Carbon selectivity of EG produced in PEC CH4 conversion on WO3 photoanodes with different {010} facet ratios at a range of potentials under 100 mW cm−2 illumination. (h) Schematic illustration of the proposed reaction mechanism for PEC CH4 conversion into ethylene glycol. Reproduced with permission [76]. Copyright: 2021, Wiley–VCH.