High performance supercapacitors using lignin based electrospun carbon nanofiber electrodes in ionic liquid electrolytes
| Autor: | John P. Ferraris, Rangana Jayawickramage |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Carbon nanofiber Mechanical Engineering Bioengineering 02 engineering and technology General Chemistry Electrolyte 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Electrospinning 0104 chemical sciences chemistry.chemical_compound chemistry Chemical engineering Mechanics of Materials Ionic liquid Propylene carbonate Ionic conductivity General Materials Science Polymer blend Electrical and Electronic Engineering 0210 nano-technology Ethylene carbonate |
| Zdroj: | Nanotechnology. 30(15) |
| ISSN: | 1361-6528 |
| Popis: | Flexible, free standing and binder-free electrodes were fabricated by electrospinning from a series of lignin: polyvinyl alcohol (PVA) polymer blends, followed by heat treatment. PVA has the dual function of facilitating the electrospinning of lignin and acting as a sacrificial polymer. Upon stabilization, carbonization and CO2 activation, carbon nanofibers (ACNF) derived from the lignin:PVA 80:20 blend displayed a high surface area of 2170 m2 g-1 and a mesopore volume of 0.365 cm3 g-1. ACNFs derived from all the compositions show high degrees of graphitization based on Raman analysis. Pyr14TFSI ionic liquid (IL), modified by mixing with propylene carbonate and ethylene carbonate to reduce the viscosity and increase the ionic conductivity, was used as a high-performance electrolyte. The resulting IL mixture exhibited a four-fold increase in ionic conductivity compared to the neat IL Coin cell supercapacitors using electrodes derived from lignin:PVA 80:20 blends and this electrolyte displayed 87 F g-1 specific capacitance and 38 Wh kg-1 energy density which is the highest reported energy density for lignin:PVA blends to date. |
| Databáze: | OpenAIRE |
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