Hierarchical MnCo-layered double hydroxides@Ni(OH)2 core-shell heterostructures as advanced electrodes for supercapacitors

Shude Liu, Su Chan Lee, Umakant Patil, Iman Shackery, Shinill Kang, Kan Zhang, Jong Hyeok Park, Kyung Yoon Chung, Seong Chan Jun

Research output: Contribution to journalArticle

143 Citations (Scopus)

Abstract

Rational assembly and hetero-growth of hybrid structures consisting of multiple components with distinctive features are a promising and challenging strategy to develop materials for energy storage applications. Herein, we propose a supercapacitor electrode comprising a three-dimensional self-supported hierarchical MnCo-layered double hydroxides@Ni(OH)2 [MnCo-LDH@Ni(OH)2] core-shell heterostructure on conductive nickel foam. The resultant MnCo-LDH@Ni(OH)2 structure exhibited a high specific capacitance of 2320 F g-1 at a current density of 3 A g-1, and a capacitance of 1308 F g-1 was maintained at a high current density of 30 A g-1 with a superior long cycle lifetime. Moreover, an asymmetric supercapacitor was successfully assembled using MnCo-LDH@Ni(OH)2 as the positive electrode and activated carbon (AC) as the negative electrode. The optimized MnCo-LDH@Ni(OH)2//AC device with a voltage of 1.5 V delivered a maximum energy density of 47.9 W h kg-1 at a power density of 750.7 W kg-1. The energy density remained at 9.8 W h kg-1 at a power density of 5020.5 W kg-1 with excellent cycle stability.

Original languageEnglish
Pages (from-to)1043-1049
Number of pages7
JournalJournal of Materials Chemistry A
Volume5
Issue number3
DOIs
Publication statusPublished - 2017 Jan 1

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All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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