Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 9, Issue 7, Pages 6114-6122Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b15804
Keywords
artificial photosynthesis; cobalt; photocatalyst; solar energy conversion; water splitting
Funding
- Photon and Quantum Basic Research Coordinated Development Program of the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan
- Chemical Conversion of Light Energy program of PRESTO/Japan Science and Technology Agency (JST)
- [JP15K14220]
- [JP16H06130]
- [JP16H06439]
- [JP16H06441]
- Grants-in-Aid for Scientific Research [16H06439, 16H06441, 16H06130, 15H00890, 15K14220] Funding Source: KAKEN
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The structure of cobalt oxide (CoOx) nanoparticles dispersed on rutile TiO2 (R-TiO2) was characterized by X-ray diffraction, UV-vis-NIR diffuse reflectance spectroscopy, high resolution transmission electron microscopy, X-ray absorption fine structure spectroscopy, and X-ray photoelectron spectroscopy. The CoOx, nanoparticles were loaded onto R-TiO2 by an impregnation method from an aqueous solution containing Co(NO3)(2)center dot 6H(2)O followed by heating in air. Modification of the R-TiO2 with 2.0 wt % Co followed by heating at 423 K for 1 h resulted in the highest photocatalytic activity with good reproducibility. Structural analyses revealed that the activity of this photocatalyst depended strongly on the generation of Co3O4 nanoclusters with an optimal distribution. These nanoclusters are thought to interact with the R-TiO2 surface, resulting in visible light absorption and active sites for water oxidation.
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