Iron-doped carbon electrode materials derived from polyethersulfone. (January 2021)

• Record Type: Journal Article
• Authors: Wu, Dichen; He, Tianqi; Albashir, Abdalazeez Ismail Mohamed; Tan, Yongtao; Ran, Fen
• Is Part Of: Journal of energy storage. Volume 33(2021)
• Publication Date: 2021-01
• Subjects: Doped carbon -- Electrode material -- Polymer precursor -- Supercapacitors; Energy storage -- Periodicals; Energy storage -- Research -- Periodicals; 621.3126
• DOI: 10.1016/j.est.2020.102099
• Languages: English
• ISSNs: 2352-152X

Abstract

Highlights: Taking polyethersulfone membrane as precursor, this paper provides an effective way to recycle and reuse PES membrane. Surface modification with concentrated nitric acid and introduction of a large number of oxygen-containing functional groups improved the wettability of the material. The introduction of Fe element into carbon materials can reduce the number of graphite carbon layers and improve the conductivity, thus greatly improving the cycle stability. Abstract: In this work, carbon materials are prepared by sintering polyethersulfone membrane as precursor, and oxygen-containing functional groups are introduced into its surface with concentrated nitric acid as modifier. Then, the characteristics of oxygen-containing functional groups are used to adsorb iron ions to prepare iron-doped carbon material. And after doping with iron, the material not only has higher capacitance (227.9 F/g at 0.5 A/g), but also has better rate performance and cycling stability. Specifically, with the current densities increased from 0.5 A/g to 5 A/g, the retention rate of PES-C-Fe3 is 74.84 %, while that of the original carbon material is only 51.83 %. Moreover, the cycle life of the original carbon material decreases to 77.55 % after 1, 000 cycles, but PES-C-Fe3 can maintain 82.79 % of the initial capacitance after 10, 000 cycles.