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Fabrication of an Efficient N, S Co-Doped $WO_{3}$ Operated in Wide-Range of Visible-Light for Photoelectrochemical Water Oxidation
| Content Provider | MDPI |
|---|---|
| Author | Li, Dong Wu, Fachao Gao, Caiyun Shen, Hongfang Han, Fei Han, Fenglan Chen, Zhanlin |
| Copyright Year | 2022 |
| Description | In this work, a highly efficient wide-visible-light-driven photoanode, namely, nitrogen and sulfur co-doped tungsten trioxide $(S-N-WO_{3}$), was synthesized using tungstic acid $(H_{2}WO_{4}$) as W source and ammonium sulfide $((NH_{4})_{2}$S), which functioned simultaneously as a sulfur source and as a nitrogen source for the co-doping of nitrogen and sulfur. The EDS and XPS results indicated that the controllable formation of either N-doped $WO_{3}$ $(N-WO_{3}$) or $S-N-WO_{3}$ by changing the $n_{W}:n_{(NH4)2S}$ ratio below or above 1:5. Both N and S contents increased when increasing the $n_{W}:n_{(NH4)2S}$ ratio from 1:0 to 1:15 and thereafter decreased up to 1:25. The UV-visible diffuse reflectance spectra (DRS) of $S-N-WO_{3}$ exhibited a significant redshift of the absorption edge with new shoulders appearing at 470–650 nm, which became more intense as the $n_{W}:n_{(NH4)2S}$ ratio increased from 1:5 and then decreased up to 1:25, with the maximum at 1:15. The values of $n_{W}:n_{(NH4)2S}$ ratio dependence is consistent with the cases of the S and N contents. This suggests that S and N co-doped into the $WO_{3}$ lattice are responsible for the considerable redshift in the absorption edge, with a new shoulder appearing at 470–650 nm owing to the intrabandgap formation above the valence band (VB) edge and a dopant energy level below the conduction band (CB) of $WO_{3}$. Therefore, benefiting from the S and N co-doping, the $S-N-WO_{3}$ photoanode generated a photoanodic current under visible light irradiation below 580 nm due to the photoelectrochemical (PEC) water oxidation, compared with pure $WO_{3}$ doing so below 470 nm. |
| Starting Page | 2079 |
| e-ISSN | 20794991 |
| DOI | 10.3390/nano12122079 |
| Journal | Nanomaterials |
| Issue Number | 12 |
| Volume Number | 12 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2022-06-16 |
| Access Restriction | Open |
| Subject Keyword | Nanomaterials Inorganic Chemistry N, S Co-doped Water Oxidation Tungsten Trioxide Photoanode Photoelectrochemical Water Splitting |
| Content Type | Text |
| Resource Type | Article |
