Significantly improved conductivity of spinel Co3O4 porous nanowires partially substituted by Sn in tetrahedral sites for high-performance quasi-solid-state supercapacitors

Porous spinel-structured Co3O4 nanowires partially substituted by Sn in tetrahedral sites (CSO) were grown on a multi-layered graphene film (CSO@GF) with a high specific surface area (SSA) through a simple and low-cost hydrothermal method, followed by a thermal annealing process. The as-synthesized...

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Published inJournal of materials chemistry. A, Materials for energy and sustainability Vol. 9; no. 11; pp. 7005 - 7017
Main Authors Chen, Yunjian, Zhu, Jia, Wang, Ni, Cheng, Huanyu, Tang, Xianzhong, Komarneni, Sridhar, Hu, Wencheng
Format Journal Article
LanguageEnglish
Published Cambridge Royal Society of Chemistry 01.01.2021
Subjects
Capacitance
Cobalt oxides
Conductivity
Cycles
Electrodes
Energy storage
Ferric oxide
Flux density
Graphene
Multilayers
Nanotechnology
Nanowires
Retention
Solid state
Spinel
Stability
Substitutes
Supercapacitors
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Summary:Porous spinel-structured Co3O4 nanowires partially substituted by Sn in tetrahedral sites (CSO) were grown on a multi-layered graphene film (CSO@GF) with a high specific surface area (SSA) through a simple and low-cost hydrothermal method, followed by a thermal annealing process. The as-synthesized binder-free CSO@GF electrode exhibited high specific capacitance (2032.6 F g−1 at 1 A g−1), superior rate capability (approximately 55.1% capacitance retention even at a current density of up to 40 A g−1), and remarkable cycling stability (94.3% capacitance retention after 10 000 cycles) due to significantly improved conductivity, which was further verified by density functional (DFT) calculations. A quasi-solid-state asymmetric supercapacitor (ASC) composed of the prepared CSO@GF and Fe2O3@GF as the positive and negative electrodes, respectively, was fabricated using a PVA-KOH gel electrolyte. The as-assembled supercapacitor delivered a prominent specific capacitance of 200.2 F g−1, an outstanding energy density of 62.6 W h kg−1 at a power density of 751.2 W kg−1, and an excellent cycling stability with 91.69% capacity retention after 10 000 cycles, suggesting great potential for CSO@GF in high energy density storage devices.
ISSN:2050-7488
2050-7496
DOI:10.1039/d0ta12095b