AI Article Synopsis
- The performance of semiconductor photocatalysts in reactions depends significantly on their surface states, which facilitate charge transfer.
- Rh-doped rutile shows a 30x increase in hydrogen production efficiency when ascorbic acid is used as a sacrificial agent, compared to undoped rutile.
- Ascorbic acid alters the surface chemistry by neutralizing harmful Rh(IV) sites, ultimately boosting the photocatalytic activity of Rh-doped rutile by reducing recombination of electron-hole pairs.
Article Abstract
The surface states of a semiconductor photocatalyst are essential for interfacial charge transfer in heterogeneous photocatalytic reactions. Here, we report that the light-driven hydrogen evolution reaction (HER) activity of 0.5 mol % Rh-doped rutile increases by more than 30 times compared with that of rutile when ascorbic acid is used as a sacrificial agent. Intensity-modulated photocurrent spectroscopy and surface photovoltage spectroscopy are employed to reveal the impact of surface states on the photo-oxidation reactions. It is found that the adsorption of ascorbic acid molecules dramatically reduces the activity of rutile due to coverage of the HER-active Ti sites. Nevertheless, for Rh-doped rutile, ascorbic acid neutralizes the Rh(IV) sites that would otherwise cause severe recombination of electron-hole pairs and resurrects its photocatalytic performance. This work demonstrates the key role of interfacial chemistry in photocatalytic reactions and provides a strategy for excavating the potential of various photocatalysts.
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| http://dx.doi.org/10.1021/acsami.2c06302 | DOI Listing |
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