Visible light induced hydrogen evolution on new hetero-system ZnFe2O4/SrTiO3

被引：142

作者：

Boumaza, S. ^{[2
,3
]}

Boudjemaa, A. ^{[2
,3
]}

Bouguelia, A. ^{[1
]}

Bouarab, R. ^{[2
]}

Trari, M. ^{[1
]}

机构：

[1] USTHB, Fac Chem, Lab Storage & Valorisat Renewable Energies, Algiers, Algeria

[2] USTHB, Fac Chem, Lab Nat Gas, Algiers, Algeria

[3] Ctr Rech Sci & Tech Anal Physicochim CRAPC, RP-16004 Algiers, Algeria

来源：

APPLIED ENERGY | 2010年 / 87卷 / 07期

关键词：

Photoelectrochemical; Spinel; ZnFe2O4; Hetero-system; Hydrogen; SRTIO3; THIN-FILMS; PHOTOELECTROCHEMICAL PROPERTIES; SONOCHEMICAL METHOD; SPINEL; CATALYST; FERRITE; STORAGE; ENERGY;

D O I：

10.1016/j.apenergy.2009.12.016

中图分类号：

TE [石油、天然气工业]; TK [能源与动力工程];

学科分类号：

0807 ; 0820 ;

摘要：

The physical properties and photoelectrochemical characterization of the spinel ZnFe2O4, elaborated by chemical route, have been investigated for the hydrogen production under visible light. The forbidden band is found to be 1.92 eV and the transition is indirectly allowed. The electrical conduction occurs by small polaron hopping with activation energy of 0.20 eV. p-type conductivity is evidenced from positive thermopower and cathodic photocurrent. The flat band potential (0.18 V-SCE) determined from the capacitance measurements is suitably positioned with respect to H2O/H-2 level (-0.85 V-SCE). Hence, ZnFe2O4 is found to be an efficient photocatalyst for hydrogen generation under visible light. The photo-activity increases significantly when the spinel is combined with a wide band gap semiconductor. The best performance with a hydrogen rate evolution of 9.2 cm(3)h(-1) (mg catalyst)(-1) occurs over the new hetero-system ZnFe2O4/SrTiO3 in Na2S2O3 (0.025 M) solution. (C) 2009 Elsevier Ltd. All rights reserved.

引用

页码：2230 / 2236

页数：7

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