Balanced Excitation between Two Semiconductors in Bulk Heterojunction Z-Scheme System for Overall Water Splitting

被引：76

作者：

Srinivasan, Nagarajan ^{[1
]}

Sakai, Etsuo ^{[1
]}

Miyauchi, Masahiro ^{[1
]}

机构：

[1] Tokyo Inst Technol, Dept Met & Ceram Sci, Grad Sch Sci & Engn, Meguro Ku, 2-12-1 Ookayama, Tokyo 1528552, Japan

来源：

ACS CATALYSIS | 2016年 / 6卷 / 04期

关键词：

heterogeneous photocatalysts; water splitting; Z-scheme; solar energy conversion; visible light; VISIBLE-LIGHT IRRADIATION; HYDROGEN-PRODUCTION; PHOTOCATALYST; PERFORMANCE; OXIDATION; MEDIATOR; FILMS; H-2;

D O I：

10.1021/acscatal.6b00267

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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.

引用

页码：2197 / 2200

页数：4

共 24 条

[1] Efficient Visible-Light-Driven Z-Scheme Overall Water Splitting Using a MgTa2O6-xNy/TaON Heterostructure Photocatalyst for H2 Evolution [J].