Photoanodic response of hematite electrode to citric acid in aqueous solution

Photoelectrochemistry of Hematite

“…The value of I effi was evaluated from the term of (2η mole /η elec ) Â100 by consideration of Eq. (29). The value of 100.0% was obtained as I effi in the process under visible light irradiation.…”

“…The aqueous solution of 10 mM FeCl 2 -0.15 M NaCl (pH = 4.4) under oxygen gas bubbling was used for the electrochemical deposition of iron oxide film. The temperature of this solution was kept constant at 25 C by circulation of thermo-stated water [29,26]. Figure 2 shows the potential of titanium working electrode during the electrolysis by repetition of cathodic pulse (I c = À7 mA, t c = 1 s) and anodic pulse (I a = +1 mA, t a = 1 s) in aqueous 10 mM FeCl 2 -0.15 M NaCl solution under O 2 bubbling for 100 s. The potential changed periodically with the cathodic and anodic current pulses.…”

“…The HPLC analysis of organic acids in the solution was carried out to reveal the reaction process of citric acid on hematite photoelectrode in aqueous solution [29]. This hematite was Iron Ores and Iron Oxide Materials the hematite electrode potential of 1.0 V vs. Ag/AgCl.…”

“…In this chapter, I would like to describe photoelectrochemistry of hematite in terms of electrochemical preparation of iron oxide film, photoelectrochemical characterization of hematite and photo-oxidation reaction of chemical species on hematite mainly based on the results we have obtained [24][25][26][27][28][29].…”

Photoelectrochemical Process on Semiconductor Electrodes

“…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.…”