A novel self-branching MnCo2O4/ nanographene hybrid composites on macroporous electrically conductive network as bifunctional electrodes for boosting miniature supercapacitors and sodium ion batteries

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

View graph of relations

Author(s)

  • Dajun Wu
  • Haochi Han
  • Xuekun Hong
  • Shi Tao
  • Shaohui Xu
  • Bin Qian
  • Lianwei Wang
  • Xuefeng Chen

Detail(s)

Original languageEnglish
Article number155720
Journal / PublicationJournal of Alloys and Compounds
Volume846
Online published20 May 2020
Publication statusOnline published - 20 May 2020

Abstract

In situ construction of 3D MnCo2O4/graphene composites on a porous framework is a desirable means to improve charge storage and cycling lifetime of energy storage devices. Herein, a bifunctional MnCo2O4/nanographene hybrid composites (B-n-MnCo2O4) with novel self-branching construct are prepared on a macroporous electrically conductive network (MECN) for boosting miniature super-capacitors and sodium ion batteries. The porous B-n-MnCo2O4@MECN electrode provides adequate space to accommodate the large volume change and structural expansion during cycling. As a result, the 1 cm2 electrode boasts a capacitance of ∼7.02 F cm−2/∼2341 F g−1 at 3 mA cm−2. The B-n-MnCo2O4@MECN||AC@Ni-foam supercapacitor with a high energy density (32.0 Wh kg−1, at 6400 W kg−1) has a long lifetime as manifested by only 20% capacitance deterioration after 20,000 cycles. Meanwhile, as an anode in sodium-ion batteries (SIBs), B-n-MnCo2O4@MECN has a reversible specific capacity of 541.2 mAh g−1 at 50 mA g−1 and rate capability of 150.0 mAh g−1 at 200 mA g−1. Nanographene not only provides the conductive network for the self-branching MnCo2O4 to accelerate electron conductivity and ion transport, but also relieves the volume changes during cycling. The strategy and bifunctional materials have a large potential in different types of energy storage devices.

Research Area(s)

  • MnCo2O4, Nano composites, Nanographene, Self-branching, Sodium ion battery, Supercapacitor

Citation Format(s)

A novel self-branching MnCo2O4/ nanographene hybrid composites on macroporous electrically conductive network as bifunctional electrodes for boosting miniature supercapacitors and sodium ion batteries. / Wu, Dajun; Han, Haochi; Hong, Xuekun; Tao, Shi; Xu, Shaohui; Qian, Bin; Wang, Lianwei; Chen, Xuefeng; Chu, Paul K.

In: Journal of Alloys and Compounds, Vol. 846, 155720, 15.12.2020.

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