Journal
ADVANCED MATERIALS
Volume 33, Issue 39, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202006780
Keywords
charge transfer; InVO; (4); mesocrystals; photocatalytic N; (2) conversion; self-assembly
Categories
Funding
- National Key R&D Program of China [2018YFE0208500]
- 973 programs [2017YFA0204800]
- Fundamental Research Funds for the Central Universities [020414380167]
- NSF of China [21972065, 21773114, 21773027, 22033002]
- NSF of Jiangsu Province [BK2071246]
- Program for Guangdong Introducing Innovative and Entrepreneurial Teams [2019ZT08L101]
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The study successfully fabricated the unique InVO4 mesocrystal superstructure and proposed its growth mechanism. Measurements of single-particle surface photovoltage and confocal fluorescence spectroscopy demonstrated significant electron transfer characteristics of the mesocrystal superstructure. This superstructure greatly influences the photocatalytic performance of InVO4.
The unique InVO4 mesocrystal superstructure, particularly with cubical skeleton and hollow interior, which consists of numerous nanocube building blocks, closely stacking by stacking, aligning by aligning, and sharing the same crystallographic orientations, is successfully fabricated. The synergy of a reaction-limited aggregation and an Ostwald ripening process is reasonably proposed for the growth of this unique superstructure. Both single-particle surface photovoltage and confocal fluorescence spectroscopy measurements demonstrate that the long-range ordered mesocrystal superstructures can significantly retard the recombination of electron-hole pairs through the creation of a new pathway for anisotropic electron flow along the inter-nanocubes. This promising charge mobility feature of the superstructure greatly contributes to the pronounced photocatalytic performance of the InVO4 mesocrystal toward fixation of N-2 into NH3 with the quantum yield of 0.50% at wavelength of 385 nm.
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