A flexible and high voltage symmetric supercapacitor based on hybrid configuration of cobalt hexacyanoferrate/reduced graphene oxide hydrogels

Xu Zhang, Jietao Jiang, Ye Chen, Kui Cheng, Fan Yang, Jun Yan, Kai Zhu, Ke Ye, Guiling Wang, Li Min Zhou, Dianxue Cao

Research output: Journal article publicationJournal articleAcademic researchpeer-review

34 Citations (Scopus)

Abstract

Flexible solid-state supercapacitor (FSSC) holds great promise as power source to supply the next generation of portable and wearable electronics. Assembling asymmetric supercapacitor constructed with broadening cell voltage (V) is the promising way to increase the energy density. However, the imparity reaction kinetics between EDLC and pseudocapacitive materials will further lead to inferior power density. Hence, to pursue higher working voltage and energy density, a hybrid configuration of cobalt hexacyanoferrate/reduced graphene oxide hydrogels (PB-Co/rGOH) is prepared through a one-pot hydrothermal method. With highly interconnected 3D network structure, excellent mechanical robustness and the synergistic effects between the graphene and PB-Co, the resultant PB-Co/rGOH exhibits a high specific capacitance of 220 F g−1and well cycle stability (83% capacitance retention after 10,000 cycles at 5 A g−1). Moreover, the assembled PB-Co/rGOH//PB-Co/rGOH symmetric flexibly solid-state supercapacitor exhibits an amazing higher working voltage of 2.0 V and a remarkable energy density of 57.5 Wh kg−1, which is comparable with that of Ni/MH batteries (60–120 Wh kg−1). These excellent electrochemical performances of the hybrid electrode provide a rational design strategy for developing supercapacitors with high energy density.
Original languageEnglish
Pages (from-to)321-329
Number of pages9
JournalChemical Engineering Journal
Volume335
DOIs
Publication statusPublished - 1 Mar 2018

Keywords

  • Cobalt hexacyanoferrate
  • Energy density
  • Flexibly solid-state supercapacitor
  • High voltage
  • Reduced graphene oxide hydrogels

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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