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Electrochemical Performance of Supercapacitor with Stacked Copper Foils Coated with Graphene Nanoplatelets.

ABSTRACT: The energy density of conventional supercapacitors is in the range of 6-10?Wh?kg-1, which has restricted them from many applications that require devices with long durations. Herein, we report a method for enhancing the energy density of a device through the parallel stacking of five copper foils coated on each side with graphene nanoplatelets. Microporous papers immersed in 2?M aqueous sodium sulphate were used as separators. With a low contact resistance of 0.05 ?, the supercapacitor yielded an optimum specific energy density and a specific power density of 24.64?Wh?kg-1 and 402?W?kg-1 at 0.8?V, respectively. The working potential was increased to 2.4?V when three of the supercapacitors were connected in series, forming a tandem device. Its potential for real applications was manifested by the ability to light up a light-emitting diode for 40?s after charging for 60?s.

SUBMITTER: Chiam SL

PROVIDER: S-EPMC5814563 | biostudies-literature | 2018 Feb

REPOSITORIES: biostudies-literature

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Electrochemical Performance of Supercapacitor with Stacked Copper Foils Coated with Graphene Nanoplatelets.

Chiam S L SL Lim H N HN Hafiz S M SM Pandikumar A A Huang N M NM

Scientific reports 20180215 1

The energy density of conventional supercapacitors is in the range of 6-10 Wh kg<sup>-1</sup>, which has restricted them from many applications that require devices with long durations. Herein, we report a method for enhancing the energy density of a device through the parallel stacking of five copper foils coated on each side with graphene nanoplatelets. Microporous papers immersed in 2 M aqueous sodium sulphate were used as separators. With a low contact resistance of 0.05 Ω, the supercapacito ...[more]

PMID: 29449631

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