Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 545, Issue -, Pages 1-7Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2019.03.005
Keywords
CO2 electrochemical reduction; Cu nanoparticles; Carbon aerogel; CO2 activation; N-2 activation
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Funding
- National Natural Science Foundation of China [21676129, 21607063, 21567008]
- Jiangsu Collaborative Innovation Center of Technology and Material of Water Treatment, Programe of 5511 Talents in Scientific and Technological Innovation of Jiangxi Province [20165BCB18014]
- Academic and Technical Leaders of the Main Disciplines in Jiangxi Province [20172BCB22018]
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The conversion of CO2 into carbon-based fuels via electrochemical reduction is a promising approach to realizing the termination of carbon cycling. Copper (Cu-0) is considered to be an effective electrochemical catalyst for such purpose. However, it is limited by its instability and low selectivity. In this work, Cu2+ was embedded into a polycondensation structure of resorcinol (R) and formaldehyde (F) via sol-gel reaction, and the complex was then calcined at high temperature to obtain copper nanoparticles-dispersed carbon aerogels (Cu/CA). The samples were further activated sequentially under CO2 and N-2 atmosphere. The final products under different activation temperature of secondary N-2 atmosphere were obtained and marked as Cu/CA-CO2-N-2-T. The existence of highly dispersed Cu-0 on the carbon aerogels was confirmed by XPS and HRTEM, which exhibited attractive activity towards electrochemical CO2 reduction reaction (CO2RR) forming carbon product in 0.1 M KHCO3 aqueous media. Furthermore, the CO2 RR product distribution varied under different samples. The sample activated under 700 degrees C (Cu/CA-CO2-N-2-700) with Cu loading c.a. 5.13 wt% showed remarkable CO faradaic efficiency (FE) (75.6%) at low overpotential of -0.49 V. Further calcination led to more exposure of copper, and CO dimerization to C2 product. The high selectivity toward CO by Cu/CA-CO2-N-2-700 maybe attributed to their excellent stability in maintaining the metallic nature of Cu component within the hydrophobic carbon aerogels during electrocatalysis, which further prevents the adsorption and reduction of CO on the catalyst. (C) 2019 Elsevier Inc. All rights reserved.
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