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Hierarchical electrodes of NiCo2S4 nanosheets anchored sulfur-doped Co3O4 nanoneedles with advanced performance for battery-supercapacitor hybrid devices

Abstract

Binder free electrode of core-shell structure has shown great potential in a variety of important energy storage systems. In order to endow the core-shell hierarchical structure with enhanced electrochemical property, rationally designed and fabricated hierarchical structure with controllable morphology and greater electrical conductivity are highly desired. In this work, uniform dendritic S-Co3O4@NiCo2S4 hierarchical structure gown on Ni foam is successfully designed and synthesized via sulfur-doping Co3O4 (S-Co3O4) as inner core of enhanced conductivity. The hierarchical electrode exhibits high areal capacity (10.9 mAh/cm2 at a current density of 8 mA/cm2), a good rate performance (72.5% retention after increasing the current densities from 8 to 30 mA/cm2), and excellent cycling stability (97.3% retention after 5000 cycles). Moreover, a hybrid energy storage battery-supercapacitor device, constructed from a S-Co3O4@NiCo2S4 positive electrode and an active carbon (AC) negative electrode, shows high energy density and power density. Contributed to short ion diffusion, large electroactive sites and low contact resistance, our work not only shows a promising electrode for energy storage battery-supercapacitor hybrid (BSH) device, but also provides an attractive strategy for design of electrode materials.

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Publication details

The article was received on 27 Nov 2018, accepted on 09 Jan 2019 and first published on 09 Jan 2019


Article type: Paper
DOI: 10.1039/C8TA11426A
Citation: J. Mater. Chem. A, 2019, Accepted Manuscript
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    Hierarchical electrodes of NiCo2S4 nanosheets anchored sulfur-doped Co3O4 nanoneedles with advanced performance for battery-supercapacitor hybrid devices

    Y. Ouyang, H. Ye, X. Xia, X. Jiao, G. Li, S. Mutahir , L. Wang, D. Mandler, L. Wu and Q. Hao, J. Mater. Chem. A, 2019, Accepted Manuscript , DOI: 10.1039/C8TA11426A

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