Mg-Doped CuFeO2 Photocathodes for Photoelectrochemical Reduction of Carbon Dioxide

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• 作者：Jing Gu ; Anna Wuttig ; Jason W. Krizan ; Yuan Hu ; Zachary M. Detweiler ; Robert J. Cava ; Andrew B. Bocarsly
• 刊名：The Journal of Physical Chemistry C
• 出版年：2013
• 出版时间：June 20, 2013
• 年：2013
• 卷：117
• 期：24
• 页码：12415-12422
• 全文大小：425K
• 年卷期：v.117,no.24(June 20, 2013)
• ISSN：1932-7455

文摘

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 鈭?.4 V vs SCE. Photoelectrodes were determined to have a 鈭?.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 鈭?.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.