Improved Photoelectrochemical Activity of CaFe2O4/BiVO4 Heterojunction Photoanode by Reduced Surface Recombination in Solar Water Oxidation

• DOI: 10.1021/am504283t
• Publication Date: 2014-10-01T10:38:27Z
• Authors: Eun Sun Kim; Hyun Joon Kang; Ganesan Magesh; Jae Young Kim; Ji-Wook Jang; Jae Sung Lee
• Keywords: Photocurrent; Bismuth vanadate; Bismuth ferrite

A bismuth vanadate photoanode was first fabricated by the metal–organic decomposition method and particles of calcium ferrite were electrophoretically deposited to construct a heterojunction photoanode. The characteristics photoanodes investigated in photoelectrochemical water oxidation under simulated 1 sun (100 mW cm–2) irradiation. Relative pristine BiVO4 anode, formation structure CaFe2O4/BiVO4 increased photocurrent density about 60%. effect on transfer charge carriers using hydrogen peroxide as hole scavenger. It demonstrated that reduced recombination electrode surface with little bulk recombination. modification an oxygen evolving catalyst, cobalt phosphate (Co-Pi), also beneficial for improving efficiency mainly increasing stability.