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Polyoxometalate-based yolk@shell dual Z-scheme superstructure tandem heterojunction nanoreactors: encapsulation and confinement effects.
- Source :
- Journal of Materials Chemistry A; 1/7/2022, Vol. 10 Issue 1, p180-191, 12p
- Publication Year :
- 2022
-
Abstract
- Flower-ball-like ZnIn<subscript>2</subscript>S<subscript>4</subscript>@hollow dodecahedral polyoxometalate (K<subscript>3</subscript>PW<subscript>12</subscript>O<subscript>40</subscript>)@flower-shell-like ZnIn<subscript>2</subscript>S<subscript>4</subscript>/Ag<subscript>2</subscript>S yolk@shell dual Z-scheme superstructure tandem heterojunction nanoreactors are fabricated through a two-step hydrothermal method combined with a cation exchange strategy. Hollow dodecahedral K<subscript>3</subscript>PW<subscript>12</subscript>O<subscript>40</subscript> acts as a bridge to form the special yolk@shell dual Z-scheme superstructure tandem heterojunction between two types of ZnIn<subscript>2</subscript>S<subscript>4</subscript>. Due to the encapsulation and confinement effects of the nanoreactors, the size of flower-ball-like ZnIn<subscript>2</subscript>S<subscript>4</subscript> in hollow dodecahedral K<subscript>3</subscript>PW<subscript>12</subscript>O<subscript>40</subscript> is limited to form a yolk@shell structure, which favors light multi-reflection. The surface plasmon resonance (SPR) effect of Ag<subscript>2</subscript>S nanoparticles extends the photoresponse to visible light and near-infrared regions. The resultant tandem heterojunction nanoreactors exhibit excellent photocatalytic degradation of tetracycline hydrochloride (∼99%) and hydrogen evolution (2107.3 μmol h<superscript>−1</superscript> g<superscript>−1</superscript>) performance, which are several times higher than those of the pristine one. This is ascribed to the formation of a dual Z-scheme tandem heterojunction favoring spatial charge separation, the SPR of Ag<subscript>2</subscript>S and yolk@shell hollow structure benefiting light utilization and mass transfer, and the encapsulation and confinement effects of the special nanoreactors facilitating the complete catalytic reaction and stability. This work provides an efficient strategy for constructing highly efficient tandem heterojunction photocatalysts. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 20507488
- Volume :
- 10
- Issue :
- 1
- Database :
- Complementary Index
- Journal :
- Journal of Materials Chemistry A
- Publication Type :
- Academic Journal
- Accession number :
- 154250346
- Full Text :
- https://doi.org/10.1039/d1ta07800c