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Au Nanoparticles Doped Co3O4-CoFe2O4@SiO2 as Catalyst for Visible-light-driven Water Oxidation

Abstract

We proposed a facile method to systematically fabricate Co-based oxides as water oxidation catalysts (WOCs) for oxygen evolution under visible light irradiation. The results suggested that as-prepared Co3O4-CoFe2O4, Co3O4-CoFe2O4@SiO2 and Co3O4-CoFe2O4@SiO2@Au are excellent catalysts for the water oxidation reaction, while Co3O4-CoFe2O4@SiO2@Au shows the best catalytic activity, and O2 yield of 71.24% can be obtained. To understand the insights into the relationship between structural details and functional behaviors, the as-prepared catalysts were characterized using various analytical tools, respectively. SEM and TEM analyses showed the average size of the nanoparticles was about 500 nm for three catalysts and the surface of the catalyst Co3O4-CoFe2O4 was covered by a layer floc of SiO2. XRD and EDS studies confirmed that Au nanoparticles were present in Co3O4-CoFe2O4@SiO2 nanocomposites. From the above experimental results, we concluded that the reason why Co3O4-CoFe2O4@SiO2@Au shows superior performance over the other two Co3O4-CoFe2O4 and Co3O4-CoFe2O4@SiO2 may be due to: (1) the large refractive index and low dielectric constant of SiO2 (ε = 1.56); (2) Au metal nanoparticles can effectively harvest the wide range of sunlight containing UV light and visible light because of its plasmonic effect. Our research showed that the Co3O4-CoFe2O4@SiO2@Au can be used as a efficient catalyst for water oxidation under visible light irradiation. Keywords: Water oxidation; Co3O4-CoFe2O4; SiO2; Au; Hollow porous materials; Photocatalysis

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Publication details

The article was received on 10 Apr 2018, accepted on 11 Jun 2018 and first published on 11 Jun 2018


Article type: Paper
DOI: 10.1039/C8NJ01729H
Citation: New J. Chem., 2018, Accepted Manuscript
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    Au Nanoparticles Doped Co3O4-CoFe2O4@SiO2 as Catalyst for Visible-light-driven Water Oxidation

    W. Ma, H. Li, Q. Xu, Y. Zhang, W. Wang and J. Wang, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C8NJ01729H

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