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Jang, Ji-Wook
JW Energy Lab
Research Interests
  • Materials Science, Energy

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Fabrication of CaFe2O4/TaON Heterojunction Photoanode for Photoelectrochemical Water Oxidation

Cited 22 times inthomson ciCited 14 times inthomson ci
Title
Fabrication of CaFe2O4/TaON Heterojunction Photoanode for Photoelectrochemical Water Oxidation
Author
Kim, Eun SunNishimura, NaoyukiMagesh, GanesanKim, Jae YoungJang, Ji-WookJun, HwichanKubota, JunDomen, KazunariLee, Jae Sung
Keywords
Electrochemical characteristics; Electron-hole separation; Electrophoretic depositions; Photoelectrochemical water oxidation; Photoelectrochemical water splitting; Reversible hydrogen electrodes; Transparent conducting glass; UV-Vis diffuse reflectance spectroscopy
Issue Date
201304
Publisher
AMER CHEMICAL SOC
Citation
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, v.135, no.14, pp.5375 - 5383
Abstract
Tantalum oxynitride photoanode is fabricated and modified with calcium ferrite to form a heterojunction anode for a photoelectrochemical water splitting cell. The synthesized powders are loaded sequentially to the transparent conducting glass by electrophoretic deposition, which is advantageous to form a uniform layer and a junction structure. X-ray diffraction, UV-vis diffuse reflectance spectroscopy, scanning electron microscopy, and impedance spectroscopy analysis are conducted to investigate the structural, morphological, and electrochemical characteristics of the anode. The introduction of CaFe2O4 overlayer onto TaON electrode increases the photocurrent density about five times at 1.23 V vs reversible hydrogen electrode without any co-catalyst. Impedance spectroscopy analysis indicates that the junction formation increased photocurrent density by reducing the resistance to the transport of charge carriers and thereby enhancing the electron hole separation. This photocurrent generation is a result of the overall water splitting as confirmed by evolution of hydrogen and oxygen in a stoichiometric ratio. From the study of different junction configurations, it is established that the intimate contact between TaON and CaFe2O4 is critical for enhanced performance of the heterojunction anode for photoelectrochemical water oxidation under simulated sun light.
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DOI
http://dx.doi.org/10.1021/ja308723w
ISSN
0002-7863
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