Fabrication of ultrafine manganese oxide-decorated carbon nanofibers for high-performance electrochemical capacitors

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Ying Yang
  • Sungsik Lee
  • Dennis E. Brown
  • Hairui Zhao
  • Xinsong Li
  • Daqiang Jiang
  • Shijie Hao
  • Yongxiang Zhao
  • Daoyong Cong
  • Xin Zhang

Detail(s)

Original languageEnglish
Pages (from-to)524-532
Journal / PublicationElectrochimica Acta
Volume211
Publication statusPublished - 1 Sep 2016
Externally publishedYes

Abstract

Ultrafine manganese oxide-decorated carbon nanofibers (MnOn-CNF, 1.3 < n < 2.0) as a new type of electrode materials are facilely fabricated by direct conversion of Mn, Zn-trimesic acid (H3BTC) metal organic framework fibers (Mn-ZnBTC). The construction and evolution of Mn-ZnBTC fibers are investigated by SEM and in situ high-energy XRD. The manganese oxides are highly dispersed onto the porous carbon nanofibers formed simultaneously, verified by TEM, X-ray absorption fine structure (XAFS), Raman, ICP-AES and N2 adsorption techniques. As expected, the resulting MnOn-CNF composites are highly stable, and can be cycled up to 5000 times with a high capacitance retention ratio of 98% in electrochemical capacitor measurements. They show a high capacitance of up to 179 F g-1 per mass of the composite electrode, and a remarkable capacitance of up to 18290 F g-1 per active mass of the manganese(IV) oxide, significantly exceeding the theoretical specific capacitance of manganese(IV) oxide (1370 F g-1). The maximum energy density is up to 19.7 Wh kg-1 at the current density of 0.25 A g-1, even orders higher than those of reported electric double-layer capacitors and pseudocapacitors. The excellent capacitive performance can be ascribed to the joint effect of easy accessibility, high porosity, tight contact and superior conductivity integrated in final MnOn-CNF composites.

Research Area(s)

  • Assembly, Carbon nanofiber, In situ synthesis, Manganese oxide, Supercapacitor

Bibliographic Note

Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to lbscholars@cityu.edu.hk.

Citation Format(s)

Fabrication of ultrafine manganese oxide-decorated carbon nanofibers for high-performance electrochemical capacitors. / Yang, Ying; Lee, Sungsik; Brown, Dennis E.; Zhao, Hairui; Li, Xinsong; Jiang, Daqiang; Hao, Shijie; Zhao, Yongxiang; Cong, Daoyong; Zhang, Xin; Ren, Yang.

In: Electrochimica Acta, Vol. 211, 01.09.2016, p. 524-532.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review