Photoelectrochemistry of Hematite

Abstract

It was possible to prepare a hematite film by electrochemical deposition of iron oxide in aqueous solution and its heat treatment at 500 C or higher temperature in air. The deposition process of iron oxide film from current and potential pulse methods was mentioned in relation to the equilibrium potential for iron oxide. The hematite in aqueous solution showed a clear photoanodic current due to visible light irradiation. The photo-oxidation response of hematite electrode to organic and inorganic materials in aqueous solution was summarized through the examples of citric acid, Pb 2+ and aniline.

Photoelectrochemical Process on Semiconductor Electrodes

“…The hematite electrode was obtained by heat treatment of the deposited iron oxide film at 500°C in air. The details of the preparation, characterization, and phtoelectrochemical response of hematite are summarized in the book [10].…”

“…There are a lot of reports of photoelectrodes and photocatalysis concerning water decomposition and environmental purification [1][2][3][4][5][6][7][8][9]. We have been investigating photoelectrochemical processes on semiconductor electrodes [10][11][12][13][14][15][16][17]. In the case of oxidation and reduction of chemical species in the solution, using a semiconductor electrode is preferable because reaction control may be possible by an applied voltage.…”