5 years ago

Facile Electrochemical Fabrication of Porous Fe2O3 Nanosheets for Flexible Asymmetric Supercapacitors

Facile Electrochemical Fabrication of Porous Fe2O3 Nanosheets for Flexible Asymmetric Supercapacitors
Zhibin Lei, Zonghuai Liu, Hang Yu, Ting Li, Lei Zhi, Liqin Dang, Wenliang Zhang
Fe2O3 is one of the promising negative electrodes for asymmetric supercapacitors. But the rather low conductivity and poor cycling stability hinder its practical application. Herein, we report a facile electrochemical deposition technique to prepare porous Fe2O3 nanosheets on carbon fabric (CF-Fe2O3). The obtained Fe2O3 displays highly porous nanosheet structure with reduced ion diffusion length and significantly enhanced conductivity. As a flexible supercapacitor electrode, the CF-Fe2O3 hybrid electrode delivers a large areal capacitance of 1.56 F cm–2, good rate capability, and excellent cycling stability without capacitance decay after 5000 cycles. A packaged solid-state supercapacitor device based on the flexible CF-Fe2O3 electrode exhibits an areal capacitance of 842 mF cm–2 and a volumetric energy density of 6.75 mWh cm–3, together with superior cycling performance which remains 93% capacitance after 4000 cycles. Moreover, the device performance is well retained under various bending and twisting states.

Publisher URL: http://dx.doi.org/10.1021/acs.jpcc.7b04330

DOI: 10.1021/acs.jpcc.7b04330

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