Loading…
Enhanced adsorption of oxygen species on c/h-In 2 O 3 Z-scheme heterophase junctions for oxygen-mediated photocatalytic hydrogen production
The rational design and fabrication of junction-based photocatalysts is of great importance to enhance the photocatalytic efficiency of water splitting. Herein, a new heterophase junction photocatalyst consisting of cubic bixbyite and rhombohedral corundum In 2 O 3 (c-In 2 O 3 and h-In 2 O 3 ) was r...
Saved in:
| Published in: | Catalysis science & technology 2023-07, Vol.13 (15), p.4400-4408 |
|---|---|
| Main Authors: | , , , , , , |
| Format: | Article |
| Language: | English |
| Citations: | Items that this one cites Items that cite this one |
| Online Access: | Get full text |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | The rational design and fabrication of junction-based photocatalysts is of great importance to enhance the photocatalytic efficiency of water splitting. Herein, a new heterophase junction photocatalyst consisting of cubic bixbyite and rhombohedral corundum In
2
O
3
(c-In
2
O
3
and h-In
2
O
3
) was readily prepared by directly annealing an InOOH precursor in an inert atmosphere. The resulting c/h-In
2
O
3
heterophase junction photocatalyst showed an optimal hydrogen production rate of 0.73 mmol g
−1
h
−1
in a 6 h period reaction from alkaline formaldehyde solution in the presence of molecular oxygen under visible light irradiation, which was approximately 5.6 and 3.4 times higher than that of single-component c-In
2
O
3
and h-In
2
O
3
, respectively. The superior photocatalytic activity of the c/h-In
2
O
3
heterophase junction was partially attributed to its appropriate band gap and band positions. Spectroscopic characterization and photoelectrochemistry experiments indicated that the heterophase junction photocatalyst could effectively enhance charge separation and transfer abilities between h-In
2
O
3
and c-In
2
O
3
. Furthermore, molecular O
2
was found to play a key role in mediating the photocatalytic H
2
evolution from formaldehyde oxidation as a catalytic electron scavenger, and O
2
was not consumed throughout the reaction. Thus, the photocatalytic activity was also greatly enhanced because the adsorption ability of oxygen species was effectively improved after the formation of heterophase junctions. |
|---|---|
| ISSN: | 2044-4753 2044-4761 |
| DOI: | 10.1039/D3CY00537B |