TY - JOUR
T1 - Cobalt Oxide Nanoclusters on Rutile Titania as Bifunctional Units for Water Oxidation Catalysis and Visible Light Absorption
T2 - Understanding the Structure-Activity Relationship
AU - Maeda, Kazuhiko
AU - Ishimaki, Koki
AU - Okazaki, Megumi
AU - Kanazawa, Tomoki
AU - Lu, Daling
AU - Nozawa, Shunsuke
AU - Kato, Hideki
AU - Kakihana, Masato
N1 - Funding Information:
This work was supported by Grant-in-Aids for Challenging Exploratory Research (Project no. JP15K14220), Young Scientists (A) (Project no. JP16H06130), and Scientific Research on Innovative Areas (Project nos. JP16H06439 and JP16H06441; Mixed Anion). The authors would also like to acknowledge The Hosokawa Powder Technology Foundation and The Noguchi Institute. The work presented herein was also supported in part by the Photon and Quantum Basic Research Coordinated Development Program of the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan and the ?Chemical Conversion of Light Energy? program of PRESTO/Japan Science and Technology Agency (JST).
Publisher Copyright:
© 2017 American Chemical Society.
PY - 2017/2/22
Y1 - 2017/2/22
N2 - 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)2·6H2O 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.
AB - 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)2·6H2O 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.
KW - artificial photosynthesis
KW - cobalt
KW - photocatalyst
KW - solar energy conversion
KW - water splitting
UR - http://www.scopus.com/inward/record.url?scp=85013747211&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85013747211&partnerID=8YFLogxK
U2 - 10.1021/acsami.6b15804
DO - 10.1021/acsami.6b15804
M3 - Article
C2 - 28117578
AN - SCOPUS:85013747211
VL - 9
SP - 6114
EP - 6122
JO - ACS applied materials & interfaces
JF - ACS applied materials & interfaces
SN - 1944-8244
IS - 7
ER -
