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Zn-Modified Co@N–C composites with adjusted Co particle size as catalysts for the efficient electroreduction of CO2

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Abstract

In this paper, a sequence of Zn-modified Co@N–C composites are designed and developed via the direct annealing of Zn–Co bimetallic zeolitic imidazolate framework materials with different Co/Zn ratios and at different pyrolysis temperatures. As proved by the various measurements made, the size of the Co particles in the composites could be successfully adjusted from 18 nm to 6 nm. In addition, with a decrease in particle size the Co particles become covered by carbon layers, and the specific surface area and number of Co–N–C bonds are successfully increased. As a result, the current density and CO faradaic efficiency (FE(CO)%) in the electrochemical CO2 reduction reaction gradually improved (from 1.8 to 4.2 mA cm−2 for current density and from 25% to 60% for FE(CO)%) with a decrease in the Co particle size. Meanwhile, the ratio of H2/CO in the obtained syngas could be regulated in the range 5 : 1 to 1 : 1.5. The Zn–Co@N–C-25 composite displayed optimal activity, and there was no obvious decrease in catalytic performance, even after 40 h, implying excellent stability for the Zn–Co@N–C catalyst.

Graphical abstract: Zn-Modified Co@N–C composites with adjusted Co particle size as catalysts for the efficient electroreduction of CO2

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Article information


Submitted
31 Oct 2019
Accepted
26 Dec 2019
First published
27 Dec 2019

Catal. Sci. Technol., 2020, Advance Article
Article type
Paper

Zn-Modified Co@N–C composites with adjusted Co particle size as catalysts for the efficient electroreduction of CO2

Z. Miao, W. Liu, Y. Zhao, F. Wang, J. Meng, M. Liang, X. Wu, J. Zhao, S. Zhuo and J. Zhou, Catal. Sci. Technol., 2020, Advance Article , DOI: 10.1039/C9CY02203A

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