NDLI: Solid-state, high-performance supercapacitor using graphene nanoribbons embedded with zinc manganite

Content Provider	Royal Society of Chemistry (RSC)
Author	Ahuja, Preety Sharma, Raj Kishore Singh, Gurmeet
Copyright Year	2015
Abstract	The fabrication of flexible supercapacitor involves the challenging task of preparing flexible electrodes with a large capacitance and robust mechanical strength. We report here the formulation of a high-performance solid-state flexible supercapacitor using graphene nanoribbons embedded with zinc manganite (ZnMn2O4/GNR) as the electrode and a gel polymer membrane as the electrolyte. The in situ availability of the graphene oxide nanoribbons led to the uniform dispersion of ZnMn2O4 nanospheres (about 7 nm), resulting in enhanced transport of the electrolyte ions. The fabricated ZnMn2O4/GNR∥ZnMn2O4/GNR supercapacitor was optimized with a maximum operating cell potential of 2.7 V. It delivered an energy density of about 37 W h kg−1 and had a power density of about 30 kW kg−1 at 1.25 A g−1 with good cycling stability over 4000 cycles. The high diffusion coefficient and short relaxation time of 0.34 μs (at 75 °C) are indicators of its high performance and stability at increased temperature. The superior flexibility and durability of the supercapacitor cell are evidence of their performance stability over consecutive galvanostatic charge/discharge cycles under harsh conditions.
Starting Page	4931
Ending Page	4937
Page Count	7
File Format	HTM / HTML PDF
ISSN	20507488
Volume Number	3
Issue Number	9
Journal	Journal of Materials Chemistry A
DOI	10.1039/c4ta05865h
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Supercapacitor Capacitance Graphene Zinc Manganite Electrode Polymer Electrolyte Energy density Diffusion
Content Type	Text
Resource Type	Article
Subject	Chemistry Renewable Energy, Sustainability and the Environment Materials Science

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