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Single‐Site Ni‐Grafted TiO2 with Diverse Coordination Environments for Visible‐Light Hydrogen Production.
- Source :
- ChemSusChem; 1/22/2024, Vol. 17 Issue 2, p1-8, 8p
- Publication Year :
- 2024
-
Abstract
- Solar hydrogen production at a high efficiency holds the significant importance in the age of energy crisis, while the micro‐environment manipulation of active sites on photocatalysts plays a profound role in enhancing the catalytic performance. In this work, a series of well‐defined single‐site Ni‐grafted TiO2 photocatalysts with unique and specific coordination environments, 2,2′‐bipyridine‐Ni−O−TiO2 (T−Ni Bpy) and 2‐Phenylpyridine‐Ni−O−TiO2 (T−Ni Phpy), were constructed with the methods of surface organometallic chemistry combined with surface ligand exchange for visible‐light‐induced photocatalytic hydrogen evolution reaction (HER). A prominent rate of 33.82 μmol ⋅ g−1 ⋅ h−1 and a turnover frequency of 0.451 h−1 for Ni are achieved over the optimal catalyst T−Ni Bpy for HER, 260‐fold higher than those of Ni−O−TiO2. Fewer electrons trapped oxygen vacancies and a larger portion of long‐lived photogenerated electrons (>3 ns, ~52.9 %), which were demonstrated by the electron paramagnetic resonance and femtosecond transient IR absorption, correspond to the photocatalytic HER activity over the T−Ni Bpy. The number of long‐lived free electrons injected from the Ni photoabsorber to the conduction band of TiO2 is one of the determining factors for achieving the excellent HER activity. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 18645631
- Volume :
- 17
- Issue :
- 2
- Database :
- Complementary Index
- Journal :
- ChemSusChem
- Publication Type :
- Academic Journal
- Accession number :
- 175139421
- Full Text :
- https://doi.org/10.1002/cssc.202301041