Back to Search
Start Over
Construction of WO 3 quantum dots/TiO 2 nanowire arrays type II heterojunction via electrostatic self-assembly for efficient solar-driven photoelectrochemical water splitting.
- Source :
-
Dalton transactions (Cambridge, England : 2003) [Dalton Trans] 2023 May 16; Vol. 52 (19), pp. 6284-6289. Date of Electronic Publication: 2023 May 16. - Publication Year :
- 2023
-
Abstract
- Construction of a heterojunction between quantum dots and TiO <subscript>2</subscript> nanowire arrays via electrostatic self-assembly is rarely reported. In this work, mercury lamp irradiation was used to change the surface potential of WO <subscript>3</subscript> quantum dots and TiO <subscript>2</subscript> nanowire arrays, resulting in WO <subscript>3</subscript> quantum dots tightly attached on the surface of TiO <subscript>2</subscript> nanowire through electrostatic self-assembly. Photoelectrochemical measurements showed that the WO <subscript>3</subscript> quantum dots formed a type II heterojunction with the TiO <subscript>2</subscript> nanowire arrays rather than serving as carrier-trapping sites. In the self-assembly system, the TiO <subscript>2</subscript> nanowire arrays provide a charge-transfer channel for the WO <subscript>3</subscript> quantum dots, greatly improving the contribution of the WO <subscript>3</subscript> quantum dots to the photocurrent. Quantitative calculations showed that the improvement of the bulk carrier-separation efficiency was the reason for the enhanced photoelectrochemical performance of the self-assembled system. The photocurrent density of the optical self-assembled system at 1.23 V ( vs. RHE) was ∼5.5 times as high as that of the TiO <subscript>2</subscript> nanowire arrays. More importantly, the self-assembled system exhibited excellent photoelectrochemical stability.
Details
- Language :
- English
- ISSN :
- 1477-9234
- Volume :
- 52
- Issue :
- 19
- Database :
- MEDLINE
- Journal :
- Dalton transactions (Cambridge, England : 2003)
- Publication Type :
- Academic Journal
- Accession number :
- 37083108
- Full Text :
- https://doi.org/10.1039/d3dt00483j