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Mg-Doped CuFeO2 Photocathodes for Photoelectrochemical Reduction of Carbon Dioxide

Author(s): Gu, Jing; Wuttig, Anna; Krizan, Jason W; Hu, Yuan; Detweiler, Zachary M; et al

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Abstract: Mg-doped CuFeO2 delafossite is reported to be photoelectrochemically active for CO2 reduction. The material was prepared via conventional solid-state methods, and subsequently assembled into an electrode as a pressed pellet. Addition of a Mg2+ dopant is found to substantially improve the conductivity of the material, with 0.05% Mg-doped CuFeO2 electrodes displaying photocathodic currents under visible irradiation. Photocurrent is found to onset at irradiation wavelengths of ∼800 nm with the incident photon-to-current efficiency reaching a value of 14% at 340 nm using an applied electrode potential of −0.4 V vs SCE. Photoelectrodes were determined to have a −1.1 V vs SCE conduction band edge and were found capable of the reduction of CO2 to formate at 400 mV of underpotential. The conversion efficiency is maximized at −0.9 V vs SCE, with H2 production contributing as a considerable side reaction. These results highlight the potential to produce Mg-doped p-type metal oxide photocathodes with a band structure tuned to optimize CO2 reduction.
Publication Date: 22-May-2013
Electronic Publication Date: 11-Jun-2013
Citation: Gu, Jing, Wuttig, Anna, Krizan, Jason W, Hu, Yuan, Detweiler, Zachary M, Cava, Robert J, Bocarsly, Andrew B. (2013). Mg-Doped CuFeO2 Photocathodes for Photoelectrochemical Reduction of Carbon Dioxide. The Journal of Physical Chemistry C, 117 (24), 12415 - 12422. doi:10.1021/jp402007z
DOI: doi:10.1021/jp402007z
ISSN: 1932-7447
EISSN: 1932-7455
Pages: 12415 - 12422
Language: en
Type of Material: Journal Article
Journal/Proceeding Title: The Journal of Physical Chemistry C
Version: Author's manuscript

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