NiO-bridged MnCo-hydroxides for flexible high-performance fiber-shaped energy storage device

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

3 Scopus Citations
View graph of relations

Author(s)

  • Rong Fan
  • Peifeng Li
  • Weidong Wang

Detail(s)

Original languageEnglish
Pages (from-to)1058-1064
Journal / PublicationApplied Surface Science
Volume475
Early online date3 Jan 2019
Publication statusPublished - 1 May 2019

Abstract

Flexible fiber-shaped supercapacitors (FFSSs) hold promising prospect to meet the increasingly high requirements of the wearable electronics. However, today it remains a great challenge to construct advanced supercapacitor with high areal capacity and favorable rate capability to achieve superior energy density in facile route is a great challenge. Herein, we directly used the low-cost nickel wire as the fiber substrate to in-situ grow compacted NiO buffer layer capable of strongly grafting the outer MnCo-Layered double hydroxide (MnCo-LDH) with high electrochemical reversibility. Compared to MnCo-LDH directly growing on nickel fiber in the absence of NiO, the NiO@MnCo-LDH exhibited 210% enhancement in areal capacity (165.6 mC cm−2/368.1 mF cm−2 at 0.5 mA cm−2) and ultrahigh rate capability (85% retention at 20 mA cm−2), as synthesized NiO buffer not only served as “nano glue” to strongly immobilize the active materials on the metal substrate but also positively supplied extra capacitance. Thusly, the assembled hybrid/asymmetric fiber device presented a high energy density of 0.0198 mWh cm−2 at a power density of 0.38 mW cm−2 to drive a digital watch, demonstrating its promising potential application in electronic devices. This rational design sheds light on the synthesis of nickel fiber-based supercapacitor with high energy delivery.

Research Area(s)

  • Fiber supercapacitor, Flexible, MnCo-LDH, Nickel wire, NiO