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Layered-MnO2 Nanosheet Grown on Nitrogen-Doped Graphene Template as a Composite Cathode for Flexible Solid-State Asymmetric Supercapacitor
- Source :
- ACS Applied Materials & Interfaces. 8:5251-5260
- Publication Year :
- 2016
- Publisher :
- American Chemical Society (ACS), 2016.
-
Abstract
- Flexible solid-state supercapacitors provide a promising energy-storage alternative for the rapidly growing flexible and wearable electronic industry. Further improving device energy density and developing a cheap flexible current collector are two major challenges in pushing the technology forward. In this work, we synthesize a nitrogen-doped graphene/MnO2 nanosheet (NGMn) composite by a simple hydrothermal method. Nitrogen-doped graphene acts as a template to induce the growth of layered δ-MnO2 and improves the electronic conductivity of the composite. The NGMn composite exhibits a large specific capacitance of about 305 F g–1 at a scan rate of 5 mV s–1. We also create a cheap and highly conductive flexible current collector using Scotch tape. Flexible solid-state asymmetric supercapacitors are fabricated with NGMn cathode, activated carbon anode, and PVA–LiCl gel electrolyte. The device can achieve a high operation voltage of 1.8 V and exhibits a maximum energy density of 3.5 mWh cm–3 at a power densit...
- Subjects :
- Supercapacitor
Materials science
Graphene
Composite number
Nanotechnology
02 engineering and technology
Current collector
010402 general chemistry
021001 nanoscience & nanotechnology
01 natural sciences
Capacitance
Cathode
0104 chemical sciences
Anode
law.invention
law
General Materials Science
0210 nano-technology
Nanosheet
Subjects
Details
- ISSN :
- 19448252 and 19448244
- Volume :
- 8
- Database :
- OpenAIRE
- Journal :
- ACS Applied Materials & Interfaces
- Accession number :
- edsair.doi...........c797424e41c83d8666c64ae05beb1b48