A high-performance oxygen evolution catalyst in neutral-pH for sunlight-driven CO2 reduction

Li Qin Zhou, Chen Ling (), Hui Zhou, Xiang Wang, Joseph Liao, Gunugunuri K. Reddy, Liangzi Deng, Torin C. Peck, Ruigang Zhang, M. Stanley Whittingham, Chongmin Wang, Ching-Wu Chu, Yan Yao and Hongfei Jia
Additional contact information
Li Qin Zhou: Toyota Research Institute of North America
Chen Ling: Toyota Research Institute of North America
Hui Zhou: Binghamton University
Xiang Wang: University of Pittsburgh
Joseph Liao: Enli Technology Co. Ltd.
Gunugunuri K. Reddy: Toyota Research Institute of North America
Liangzi Deng: University of Houston
Torin C. Peck: Toyota Research Institute of North America
Ruigang Zhang: Toyota Research Institute of North America
M. Stanley Whittingham: Binghamton University
Chongmin Wang: Pacific Northwest National Laboratory
Ching-Wu Chu: University of Houston
Yan Yao: University of Houston
Hongfei Jia: Toyota Research Institute of North America

Nature Communications, 2019, vol. 10, issue 1, 1-8

Abstract: Abstract The efficiency of sunlight-driven reduction of carbon dioxide (CO2), a process mimicking the photosynthesis in nature that integrates the light harvester and electrolysis cell to convert CO2 into valuable chemicals, is greatly limited by the sluggish kinetics of oxygen evolution in pH-neutral conditions. Current non-noble metal oxide catalysts developed to drive oxygen evolution in alkaline solution have poor performance in neutral solutions. Here we report a highly active and stable oxygen evolution catalyst in neutral pH, Brownmillerite Sr2GaCoO5, with the specific activity about one order of magnitude higher than that of widely used iridium oxide catalyst. Using Sr2GaCoO5 to catalyze oxygen evolution, the integrated CO2 reduction achieves the average solar-to-CO efficiency of 13.9% with no appreciable performance degradation in 19 h of operation. Our results not only set a record for the efficiency in sunlight-driven CO2 reduction, but open new opportunities towards the realization of practical CO2 reduction systems.

Date: 2019
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DOI: 10.1038/s41467-019-12009-8

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