文献类型：期刊文献

英文题名：Preparation of carbon nanofiber with multilevel gradient porous structure for supercapacitor and CO2 adsorption

作者：Ma, Shuai[1];Wang, Yixing[1];Liu, Zhenying[1];Huang, Mengnan[1];Yang, Hu[1];Xu, Zhen-liang[1]

机构：[1]East China Univ Sci & Technol, Chem Engn Res Ctr, State Key Lab Chem Engn, Membrane Sci & Engn R&D Lab, 130 Meilong Rd, Shanghai 200237, Peoples R China

年份：2019

卷号：205

起止页码：181

外文期刊名：CHEMICAL ENGINEERING SCIENCE

收录：;EI(收录号：20191906881965);WOS:【SCI-EXPANDED(收录号:WOS:000470303000017)】；

语种：英文

外文关键词：PVDF; Carbon nanofiber; Pore structure; Supercapacitor; CO2 adsorption

摘要：In this work, we demonstrate a simple method to prepare carbon nanofiber (CNF) with multilevel gradient porous structure derived from polyvinylidene fluoride (PVDF)-polyvinyl pyrrolidone (PVP) /PVP core-shell nanofiber. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) have confirmed that the as-prepared CNF contains a hollow channel embraced by mesoporous and microporous structures. Its specific surface area reaches to 1084 m(2)/g with the mesoporous volume contribution of 59%. The as-prepared porous CNF shows a high capacitance of 331 F/g at 1 A/g and 99.6% capacitance retention after 10,000 cycles at 5 A/g, which is better than the corresponding CNF with irregularly arranged hierarchical pores. The all-solid-state symmetric supercapacitor assembled using the as-prepared porous CNF as electrodes exhibits an excellent high specific capacitance of 147.4F/g at 1 A/g with a high energy density of 13.1Wh/kg. The capacitance retention still maintains at 89.2% after 2000 cycles at a current density of 5 A/g. Meanwhile, the as-prepared porous CNF also shows a high CO2 adsorption uptake, 5.08 mmol/g at 0 degrees C and 1 bar. The possible reason and mechanism have been discussed. (C) 2019 Elsevier Ltd. All rights reserved.