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Title: Mg-Doped CuFeO2 Photocathodes for Photoelectrochemical Reduction of Carbon Dioxide

Journal Article · · Journal of Physical Chemistry. C
DOI:https://doi.org/10.1021/jp402007z· OSTI ID:1418452

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. Lastly, these results highlight the potential to produce Mg-doped p-type metal oxide photocathodes with a band structure tuned to optimize CO2 reduction.

Research Organization:
Princeton Univ., NJ (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences, and Biosciences Division
Contributing Organization:
Princeton University
Grant/Contract Number:
SC0002133
OSTI ID:
1418452
Journal Information:
Journal of Physical Chemistry. C, Vol. 117, Issue 24; ISSN 1932-7447
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 140 works
Citation information provided by
Web of Science

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