Preparation of p-type CaFe2O4 photocathodes for producing hydrogen from water.

An (hk0)-oriented p-type CaFe2O4 (E(g): 1.9 eV) photocathode was prepared, and hydrogen and oxygen gases were produced from a photocell short-circuited by connecting the CaFe2O4 and n-type TiO2 electrodes under illumination without applying an external voltage. The open-circuited voltage was 0.97 V and the short-circuit current was about 200 μA/cm(2), and the amount of evaluated hydrogen and oxygen gases after 2 days of reaction were about 70 and 4 μmol, respectively.

[1]  Kazunari Domen,et al.  Facile fabrication of an efficient oxynitride TaON photoanode for overall water splitting into H2 and O2 under visible light irradiation. , 2010, Journal of the American Chemical Society.

[2]  Y. Matsumoto.  Energy Positions of Oxide Semiconductors and Photocatalysis with Iron Complex Oxides , 1996 .

[3]  Michael Grätzel,et al.  Translucent thin film Fe2O3 photoanodes for efficient water splitting by sunlight: nanostructure-directing effect of Si-doping. , 2006, Journal of the American Chemical Society.

[4]  K. Ogura,et al.  Photoelectrochemical Behavior of Electrodeposited CuO and Cu2 O Thin Films on Conducting Substrates , 2004 .

[5]  G. Somorjai,et al.  Photocatalytic production of hydrogen from water by a p- and n-type polycrystalline iron oxide assembly , 1982 .

[6]  Jun Akikusa,et al.  Photoelectrolysis of water to hydrogen in p-SiC/Pt and p-SiC/ n-TiO2 cells , 2002 .

[7]  Gabor A. Somorjai,et al.  The photodissociation of water by doped iron oxides: The unblased p/n assembly , 1984 .

[8]  Jianwei Sun,et al.  Solar water oxidation by composite catalyst/alpha-Fe(2)O(3) photoanodes. , 2009, Journal of the American Chemical Society.

[9]  A. Fujishima,et al.  Electrochemical Photolysis of Water at a Semiconductor Electrode , 1972, Nature.

[10]  M. Miyauchi,et al.  Efficient Visible Light Active CaFe2O4/WO3 Based Composite Photocatalysts: Effect of Interfacial Modification , 2009 .

[11]  T. Yamase,et al.  Photoelectrochemical cell using SiC for water splitting , 1985 .

[12]  J. Baltrus,et al.  Photoresponse of p-type zinc-doped iron(III) oxide thin films. , 2004, Journal of the American Chemical Society.

[13]  Yasumichi Matsumoto,et al.  New photocathode materials for hydrogen evolution: calcium iron oxide (CaFe2O4) and strontium iron oxide (Sr7Fe10O22) , 1987 .

[14]  Michael Grätzel,et al.  Visible light-induced water oxidation on mesoscopic α-Fe2O3 films made by ultrasonic spray pyrolysis , 2005 .