Three-Dimensional Hierarchically Mesoporous ZnCo2O4 Nanowires Grown on Graphene/Sponge Foam for High-Performance, Flexible, All-Solid-State Supercapacitors

In Kyu Moon, Seonno Yoon, Jungwoo Oh

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

To achieve high energy storage on three-dimensional (3D) structures at low cost, materials with high power and long cycle life characteristics have to be developed. We synthesized ZnCo2O4/reduced graphene oxide (rGO) binary composites in commercial sponges. ZnCo2O4 nanosheets were grown on the surface of GO/sponge through a hydrothermal reaction. The resulting flexible, free-standing ZnCo2O4/rGO/sponge electrodes were used as the electrodes in a symmetric supercapacitor. ZnCo2O4/rGO/sponge electrodes have a large specific capacitance of 1116.6 F g−1 at a scan rate of 2 mV s−1 in aqueous electrolyte. The all-solid-state flexible supercapacitor is assembled based on ZnCo2O4/rGO/sponge electrodes, which show excellent electrochemical performances with a specific capacitance of 143 F g−1 at a current density of 1 A g−1. The as-fabricated supercapacitor also exhibits excellent cycling stability (93.4 % capacitance retention after 5000 cycles) and exceptional mechanical flexibility. These results demonstrate the potential of ZnCo2O4/rGO/sponge as an electrode in flexible, high-performance supercapacitors.

Original languageEnglish
Pages (from-to)597-604
Number of pages8
JournalChemistry - A European Journal
Volume23
Issue number3
DOIs
Publication statusPublished - 2017 Jan 12

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Oxides
Graphene
Nanowires
Foams
Electrodes
Capacitance
Nanosheets
Energy storage
Electrolytes
Life cycle
Current density
Supercapacitor
Composite materials
Costs

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Organic Chemistry

Cite this

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title = "Three-Dimensional Hierarchically Mesoporous ZnCo2O4 Nanowires Grown on Graphene/Sponge Foam for High-Performance, Flexible, All-Solid-State Supercapacitors",
abstract = "To achieve high energy storage on three-dimensional (3D) structures at low cost, materials with high power and long cycle life characteristics have to be developed. We synthesized ZnCo2O4/reduced graphene oxide (rGO) binary composites in commercial sponges. ZnCo2O4 nanosheets were grown on the surface of GO/sponge through a hydrothermal reaction. The resulting flexible, free-standing ZnCo2O4/rGO/sponge electrodes were used as the electrodes in a symmetric supercapacitor. ZnCo2O4/rGO/sponge electrodes have a large specific capacitance of 1116.6 F g−1 at a scan rate of 2 mV s−1 in aqueous electrolyte. The all-solid-state flexible supercapacitor is assembled based on ZnCo2O4/rGO/sponge electrodes, which show excellent electrochemical performances with a specific capacitance of 143 F g−1 at a current density of 1 A g−1. The as-fabricated supercapacitor also exhibits excellent cycling stability (93.4 {\%} capacitance retention after 5000 cycles) and exceptional mechanical flexibility. These results demonstrate the potential of ZnCo2O4/rGO/sponge as an electrode in flexible, high-performance supercapacitors.",
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