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Preparation of Ni-loaded oxygen-enriched vacancy TiO2−x hierarchical micro-nanospheres and the study of their photocatalytic hydrogen evolution performance.
- Source :
- New Journal of Chemistry; 4/21/2022, Vol. 46 Issue 15, p7118-7127, 10p
- Publication Year :
- 2022
-
Abstract
- The introduction of oxygen vacancies (O<subscript>v</subscript>) in TiO<subscript>2</subscript> has significant effects on improving the light absorption capacity, expanding the light absorption range and inhibiting photo-generated charge recombination. Here, we used hydrochloric acid and urea mixed with TiO<subscript>2</subscript> hierarchical micro-nanospheres (THS) followed by annealing in an air atmosphere to dope THS with nitrogen and successfully mediated the formation of oxygen defects. Then, the Ni-based promoter is supported on the THS with oxygen vacancy defects by impregnating the metal ions in the solution. Compared with untreated Ni-THS, Ni-THS(O<subscript>v</subscript>) modified by oxygen deficiency has a shorter band gap and photo-generated charge separation efficiency, and its photocatalytic water splitting capacity was also significantly improved. The hydrogen production performance of Ni-THS(O<subscript>v</subscript>) (0.1 wt%) reached 4.88 mmol g<superscript>−1</superscript> h<superscript>−1</superscript> under full-spectrum (UV-vis) irradiation. The synergistic relationship between THS, surface oxygen vacancies and the supported Ni promoters was further investigated. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 11440546
- Volume :
- 46
- Issue :
- 15
- Database :
- Complementary Index
- Journal :
- New Journal of Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 156246015
- Full Text :
- https://doi.org/10.1039/d1nj06197f