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Frontiers of Chemical Science and Engineering

ISSN 2095-0179

ISSN 2095-0187(Online)

CN 11-5981/TQ

Postal Subscription Code 80-969

2018 Impact Factor: 2.809

Front. Chem. Sci. Eng.    2021, Vol. 15 Issue (6) : 1550-1560    https://doi.org/10.1007/s11705-021-2104-4
RESEARCH ARTICLE
Cobalt nanoparticle decorated N-doped carbons derived from a cobalt covalent organic framework for oxygen electrochemistry
Rui-Qi Zhang1, Ang Ma1, Xiang Liang1, Li-Min Zhao1, Hui Zhao1(), Zhong-Yong Yuan2()
1. School of Materials Science and Engineering, Liaocheng University, Liaocheng 252000, China
2. Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), School of Materials Science and Engineering, Nankai University, Tianjin 3000350, China
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Abstract

The low cost and highly efficient construction of electrocatalysts has attracted significant attention owing to the use of clean and sustainable energy technologies. In this work, cobalt nanoparticle decorated N-doped carbons (Co@NC) are synthesized by the pyrolysis of a cobalt covalent organic framework under an inert atmosphere. The Co@NC demonstrates improved electrocatalytic capabilities compared to N-doped carbon without the addition of Co nanoparticles, indicating the important role of cobalt. The well-dispersed active sites (Co–Nx) and the synergistic effect between the carbon matrix and Co nanoparticles greatly enhance the electrocatalytic activity for the oxygen reduction reaction. In addition, the Co content has a significant effect on the catalytic activity. The resulting Co@NC-0.86 exhibits a superb electrocatalytic activity for the oxygen reduction reaction in an alkaline electrolyte in terms of the onset potential (0.90 V), half-wave potential (0.80 V) and the limiting current density (4.84 mA·cm–2), and a high selectivity, as well as a strong methanol tolerance and superior durability, these results are comparable to those of the Pt/C catalyst. Furthermore, the superior bifunctional activity of Co@NC-0.86 was also confirmed in a home-built Zn-air battery, signifying the possibility for application in electrode materials and in current energy conversion and storage devices.

Keywords cobalt embedment      N-doped carbons      covalent organic framework      oxygen reduction      Zn-air battery     
Corresponding Author(s): Hui Zhao,Zhong-Yong Yuan   
Online First Date: 22 October 2021    Issue Date: 09 November 2021
 Cite this article:   
Rui-Qi Zhang,Ang Ma,Xiang Liang, et al. Cobalt nanoparticle decorated N-doped carbons derived from a cobalt covalent organic framework for oxygen electrochemistry[J]. Front. Chem. Sci. Eng., 2021, 15(6): 1550-1560.
 URL:  
https://academic.hep.com.cn/fcse/EN/10.1007/s11705-021-2104-4
https://academic.hep.com.cn/fcse/EN/Y2021/V15/I6/1550
Fig.1  Scheme 1 Schematic procedure for the synthesis of Co@NC materials.
Fig.2  SEM images of (a) NC, and (b) Co@NC-0.86; TEM images of (c) NC, (d, e) Co@NC-0.86, and high-resolution TEM image of (f) Co@NC-0.86.
Fig.3  (a) XRD patterns, (b) Raman spectra, (c) N2 adsorption-desorption isotherm curves, and (d) pore size distributions of NC and Co@NC-x.
Fig.4  (a) XPS spectrum of Co@NC-0.86; high-resolution spectra of (b) C, (c) Co, and (d) N; (e) percentages of pyridinic N, pyrrolic N, graphitic N, pyridinic-N-oxide, and Co-Nx in Co@NC-0.86.
Fig.5  (a) LSV and (b) CV curves of synthesized samples and Pt/C for ORR in O2-saturated 0.1 mol?L−1 KOH; (c) ORR Tafel plots; (d) electron transfer number (n) and H2O2 yield of Co@NC-0.86 and Pt/C for ORR in O2-saturated 0.1 mol·L−1 KOH; (e) i-t relation of resistance to methanol poison for Co@NC-0.86 and Pt/C through adding 5 mL 3 mol·L−1 methanol into solution; (f) chronoamperometric response of Co@NC-0.86 and Pt/C over 20000 s.
Fig.6  (a) LSV curves of fabricated catalysts measured in the potential both ORR and OER; (b) optical photograph of the open-circuit voltage of the Co@NC-0.86 assembled ZAB; (c) the curves of Galvanodynamic charge/discharge polarization of the assembled ZAB; (d) the discharge polarization curves and the corresponding power densities of the assembled ZAB; (e) discharge-charge cycling curves of the Co@NC-0.86-assembled ZAB; (f) digital photograph of white-light emitting diode lit by the Co@NC-0.86-assembled ZABs (three) in series.
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