Highly selective and active CO2 reduction electrocatalysts based on cobalt phthalocyanine/carbon nanotube hybrid structures

Nature Communications - Tập 8 Số 1
Xing Zhang1, Zishan Wu2, Xiao Zhang1, Liewu Li1, Yanyan Li1, Haomin Xu1, Xiaoxiao Li1, Xiaolu Yu1, Zisheng Zhang1, Yongye Liang1, Hailiang Wang2
1Department of Materials Science and Engineering, South University of Science and Technology of China, Shenzhen, 518055, China
2Department of Chemistry, Yale University, New Haven, 06520, Connecticut, USA

Tóm tắt

AbstractElectrochemical reduction of carbon dioxide with renewable energy is a sustainable way of producing carbon-neutral fuels. However, developing active, selective and stable electrocatalysts is challenging and entails material structure design and tailoring across a range of length scales. Here we report a cobalt-phthalocyanine-based high-performance carbon dioxide reduction electrocatalyst material developed with a combined nanoscale and molecular approach. On the nanoscale, cobalt phthalocyanine (CoPc) molecules are uniformly anchored on carbon nanotubes to afford substantially increased current density, improved selectivity for carbon monoxide, and enhanced durability. On the molecular level, the catalytic performance is further enhanced by introducing cyano groups to the CoPc molecule. The resulting hybrid catalyst exhibits >95% Faradaic efficiency for carbon monoxide production in a wide potential range and extraordinary catalytic activity with a current density of 15.0 mA cm−2 and a turnover frequency of 4.1 s−1 at the overpotential of 0.52 V in a near-neutral aqueous solution.

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