A bio-inspired O2-tolerant catalytic CO2 reduction electrode

Xu Lu; Zhan Jiang; Xiaolei Yuan; Yueshen Wu; Richard Malpass-Evans; Yiren Zhong; Yongye Liang; Neil B.McKeown; Hailiang Wang

2019

CHINESE SCI BULL   Impact Factor & Quartile

1001-6538

The electrochemical reduction of CO2 to give CO in the presence of O2 would allow the direct valorization of flue gases from fossil fuel combustion and of CO2 captured from air.However,it is a challenging task because O2 reduction is thermodynamically favored over that of CO2.5％ O2 in CO2 near catalyst surface is sufficient to completely inhibit the CO2 reduction reaction.Here we report an O2-tolerant catalytic CO2 reduction electrode inspired by part of the natural photosynthesis unit.The electrode comprises of heterogenized cobalt phthalocyanine molecules serving as the cathode catalyst with ＞95％ Faradaic efficiency (FE) for CO2 reduction to CO coated with a polymer of intrinsic microporosity that works as a CO2-selective layer with a CO2/O2 selectivity of ～20.Integrated into a flow electrolytic cell,the hybrid electrode operating with a CO2 feed gas containing 5％ O2 exhibits a FEco of 75.9％ with a total current density of 27.3 mA/cm2 at a cell voltage of 3.1 V.A FEco of 49.7％ can be retained when the O2 fraction increases to 20％.Stable operation for 18 h is demonstrated.The electrochemical performance and O2 tolerance can be further enhanced by introducing cyano and nitro substituents to the phthalocyanine ligand.

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WanFang

kxtb-e201924008

1.Department of Chemistry, Yale University, New Haven, CT 06520, USA;Energy Sciences Institute, Yale University, West Haven, CT 06516, USA
2.Department of Materials Science and Engineering, Shenzhen Key Laboratory of Printed Organic Electronics, Southern University of Science and Technology, Shenzhen 518055, China
3.Department of Chemistry, Yale University, New Haven, CT 06520, USA;Energy Sciences Institute, Yale University, West Haven, CT 06516, USA;Institute of Functional Nano and Soft Materials, Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University, Suzhou 215123, China
4.EastChem, School of Chemistry, University of Edinburgh, Edinburgh EH9 3FJ, UK

Xu Lu,Zhan Jiang,Xiaolei Yuan,et al. A bio-inspired O2-tolerant catalytic CO2 reduction electrode[J]. CHINESE SCI BULL,2019,64(24):1890-1895.

Xu Lu.,Zhan Jiang.,Xiaolei Yuan.,Yueshen Wu.,Richard Malpass-Evans.,...&Hailiang Wang.(2019).A bio-inspired O2-tolerant catalytic CO2 reduction electrode.CHINESE SCI BULL,64(24),1890-1895.

Xu Lu,et al."A bio-inspired O2-tolerant catalytic CO2 reduction electrode".CHINESE SCI BULL 64.24(2019):1890-1895.