期刊
FRONTIERS OF CHEMICAL SCIENCE AND ENGINEERING
卷 15, 期 6, 页码 1550-1560出版社
SPRINGER
DOI: 10.1007/s11705-021-2104-4
关键词
cobalt embedment; N-doped carbons; covalent organic framework; oxygen reduction; Zn-air battery
资金
- Natural Science Foundation of Shandong Province [ZR2019PB013]
- Training Program of Innovation and Entrepreneurship for Undergraduates [CXCY2021161]
- Natural Science Foundation of Tianjin [19JCZDJC37700]
- National Natural Science Foundation of China [21875118]
The Co@NC electrocatalyst, synthesized in this study, demonstrates improved electrocatalytic activity and durability for oxygen reduction reaction and can be applied in fields such as electrolysis and Zn-air batteries.
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-N-x) 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), halfwave 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.
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