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Metastable Ni(I)-TiO2–xPhotocatalysts: Self-Amplifying H2Evolution from Plain Water without Noble Metal Co-Catalyst and Sacrificial Agent
- Source :
- Journal of the American Chemical Society; December 2023, Vol. 145 Issue: 48 p26122-26132, 11p
- Publication Year :
- 2023
-
Abstract
- Decoration of semiconductor photocatalysts with cocatalysts is generally done by a step-by-step assembly process. Here, we describe the self-assembling and self-activating nature of a photocatalytic system that forms under illumination of reduced anatase TiO2nanoparticles in an aqueous Ni2+solution. UV illumination creates in situa Ni+/TiO2/Ti3+photocatalyst that self-activates and, over time, produces H2at a higher rate. In situX-ray absorption spectroscopy and electron paramagnetic resonance spectroscopy show that key to self-assembly and self-activation is the light-induced formation of defects in the semiconductor, which enables the formation of monovalent nickel (Ni+) surface states. Metallic nickel states, i.e., Ni0, do not form under the dark (resting state) or under illumination (active state). Once the catalyst is assembled, the Ni+surface states act as electron relay for electron transfer to form H2from water, in the absence of sacrificial species or noble metal cocatalysts.
Details
- Language :
- English
- ISSN :
- 00027863 and 15205126
- Volume :
- 145
- Issue :
- 48
- Database :
- Supplemental Index
- Journal :
- Journal of the American Chemical Society
- Publication Type :
- Periodical
- Accession number :
- ejs64557542
- Full Text :
- https://doi.org/10.1021/jacs.3c08199