期刊
CARBON
卷 201, 期 -, 页码 920-929出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2022.10.002
关键词
Capacitive deionization; Electro-adsorption; Mesoporous carbon; Carbon nanofiber; Electrospinning
In capacitive deionization, porous carbon with high specific surface area has attracted attention due to its abundant active adsorption sites. In this study, a highly mesoporous carbon nanofiber electrode was prepared, which showed high salt adsorption capacity and improved electrical double-layer capacitance.
Porous carbon with high specific surface area (SSA) has attracted considerable attention in capacitive deion-ization (CDI) owing to the abundant active adsorption sites. However, porous carbon dominated by the micro-pores tends to increase the ion transfer resistance and overlap the electrical double layers (EDLs), greatly limiting the ion adsorption rate and amount. In this work, a highly mesoporous carbon nanofiber electrode with an ul-trahigh specific surface area (SSA) was prepared via electrospinning ZIF-8/benzoxazine/polyacrylonitrile (ZIF-8/ BA-a/PAN) composite solution as carbon precursor. Benefiting from the cooperation of the simultaneous evap-oration of Zn in ZIF-8 and activation treatment, the resultant carbon nanofibers show an ultrahigh SSA of 3066.29 m2/g, a pore volume of 2.23 cm3/g and a mesopore ratio of 72.53%, which has a high salt adsorption capacity (SAC) of 47.22 and 63.83 mg/g in 500 mg/L NaCl (50 mL) solution at 1.2 and 1.6 V, respectively. Furthermore, electrochemical measurement revealed that the high electrical double-layer capacitance facilitates ion storage in the mesoporous carbon nanofibers due to the increased nanopore size and reduced EDLs over-lapping. This work provides new insight into designing novel highly mesoporous carbon with ultrahigh SSA for the next-generation electrode materials for energy and environmental applications.
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