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A Quasi 2D Flexible Micro‐Supercapacitor Based on MnO 2 //NiCo 2 O 4 as a Miniaturized Energy‐Storage Device
Author(s) -
Patil Swati J.,
Park Jong Sung,
Kim YoungBae,
Lee DongWeon
Publication year - 2018
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.201700826
Subject(s) - supercapacitor , materials science , capacitance , microfabrication , power density , energy storage , electrolyte , current density , horizontal scan rate , nanotechnology , electrode , optoelectronics , analytical chemistry (journal) , electrochemistry , cyclic voltammetry , power (physics) , chemistry , fabrication , chromatography , medicine , physics , alternative medicine , pathology , quantum mechanics
A miniaturized and flexible asymmetric micro‐supercapacitor (ASC) based on surface‐modified MnO 2 @Au and thin nanosheets of NiCo 2 O 4 @Au (termed 2D‐qMnO 2 //NiCo 2 O 4 micro‐supercapacitor) is reported. A lightweight and superior flexible micro‐supercapacitor is successfully achieved using conventional microfabrication techniques. The proposed electrodeposition method is very effective for the surface modification and, as a result, uniform and high‐quality 2D‐quasi MnO 2 and NiCo 2 O 4 thin‐film formation on a collector current is achieved. The fabricated 2D‐qMnO 2 //NiCo 2 O 4 @Au and polymeric gel electrolyte‐based micro‐supercapacitor has advantageous features, with a high areal capacitance of 5.36 mF cm −2 . The 2D‐qMnO 2 //NiCo 2 O 4 MSC delivers a high energy density of 0.42 mWh cm −2 at 48.90 mW cm −2 power density with superior cycling stability (89.62 %) over initial 5000 cycles. Impedance analysis showed that the 2D‐qMnO 2 //NiCo 2 O 4 MSC device has a phase angle of −73° with an extremely small relaxation time constant of 14 ms. Finally, excellent device performance of the 2D‐qMnO 2 //NiCo 2 O 4 MSC under different bending and twisting is demonstrated to evaluate its mechanical flexibility.