Journal
ACS CATALYSIS
Volume 6, Issue 4, Pages 2197-2200Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.6b00267
Keywords
heterogeneous photocatalysts; water splitting; Z-scheme; solar energy conversion; visible light
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Funding
- JST, Japan
- Grants-in-Aid for Scientific Research [26410234] Funding Source: KAKEN
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Heterogeneous bilayered semiconductor thin films were fabricated using p-type CaFe2O4 and n-type BiVO4 for photocatalytic overall water splitting. The interface of the semiconductor layers was modified with Co3O4 and a platinum co-catalyst. The resulting a bulk heterojunction film, which was composed of Co3O4/BiVO4/Pt/CaFe2O4/Pt and was fabricated on a substrate, produced both oxygen and hydrogen under visible-light irradiation in the absence of applied bias potential or sacrificial agents. Furthermore, a balanced absorbed photon number between CaFe2O4 and BiVO4 was shown to be a critical factor for achieving overall water splitting, thereby generating H-2 and 02 molecules in a 2:1 stoichiometric ratio. These results demonstrate that the interfacial design and management of absorbed photon number in heterogeneous photocatalysts are essential factors for constructing Z-scheme systems that are capable of overall water splitting.
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