Cost-effective synthesis of activated carbons with high surface areas for electrodes of non-aqueous electric double layer capacitors

•Activated carbons with surface areas over 3000 m2 g−1 can be prepared through simple CO2 activation.•Micropores develop through two distinctive steps during activation.•The prepared carbons exhibit a high gravimetric capacitance of approximately 80 F g−1.•A carbon with an optimized bimodal pore sys...

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Bibliographic Details
Published in:Separation and purification technology 2019-05, Vol.214, p.174-180
Main Authors: Mori, Takeshi, Iwamura, Shinichiroh, Ogino, Isao, Mukai, Shin R.
Format: Article
Language:English
Subjects:
Activated carbon
Electric double layer capacitor
Hard template
Phenolic resin
Physical activation
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Summary:•Activated carbons with surface areas over 3000 m2 g−1 can be prepared through simple CO2 activation.•Micropores develop through two distinctive steps during activation.•The prepared carbons exhibit a high gravimetric capacitance of approximately 80 F g−1.•A carbon with an optimized bimodal pore system exhibited good rate performance. Activated carbons for electrodes of non-aqueous electric double layer capacitors were prepared from composites of poly(methymethacrylate) particles and phenolic resins. Their surface areas can be increased up to 3000 m2 g−1 through simple CO2 activation. Through the characterization of pore properties of the resulting carbons, it was found that the activation process appears to be composed of two steps. The pore properties of the activated carbons were optimized to maximize their performances as electrodes for non-aqueous electric double layer capacitor electrodes.
ISSN:1383-5866
1873-3794
DOI:10.1016/j.seppur.2018.04.022