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Issue 39, 2018
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Towards high areal capacitance, rate capability, and tailorable supercapacitors: Co3O4@polypyrrole core–shell nanorod bundle array electrodes

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Abstract

Flexible supercapacitors with high areal capacitance are a promising approach for wearable energy-storage technology due to the limitation of the surface area of the human body (about 2 m2). Meanwhile, a tolerance to deformation and mechanic damage is critical for wearable applications. However, it is still a challenge to achieve supercapacitors with outstanding electrochemical performance and wearability, simultaneously. To solve this problem, we report high-performance, flexible, and tailorable solid-state supercapacitors enabled by Co3O4@PPy nanorod bundle arrays immobilized on carbon fiber cloth (CFC). Furthermore, a solid-state asymmetric supercapacitor was assembled using a freestanding Co3O4@PPy electrode, a freestanding porous carbon electrode, and PVA gel electrolyte. Benefiting from a 3D structure and the synergetic contribution of the Co3O4 nanorods and electrically conductive PPy layer, the Co3O4@PPy electrode and our developed supercapacitor exhibit a high areal capacitance of 6.67 F cm−2 at a current density of 2 mA cm−2, and 2.47 F cm−2 at 4 mA cm−2, respectively, as well as excellent rate capability. More importantly, the solid-state supercapacitor can be tailored into several units and various shapes. Each unit retains its original electrochemical performance. This work provides a new route to wearable energy-storage technology.

Graphical abstract: Towards high areal capacitance, rate capability, and tailorable supercapacitors: Co3O4@polypyrrole core–shell nanorod bundle array electrodes

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Publication details

The article was received on 02 Aug 2018, accepted on 11 Sep 2018 and first published on 11 Sep 2018


Article type: Paper
DOI: 10.1039/C8TA07477A
Citation: J. Mater. Chem. A, 2018,6, 19058-19065
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    Towards high areal capacitance, rate capability, and tailorable supercapacitors: Co3O4@polypyrrole core–shell nanorod bundle array electrodes

    L. Ma, H. Fan, X. Wei, S. Chen, Q. Hu, Y. Liu, C. Zhi, W. Lu, J. A. Zapien and H. Huang, J. Mater. Chem. A, 2018, 6, 19058
    DOI: 10.1039/C8TA07477A

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