Immense Microporous Carbon@Hydroquinone Metamorphosed from Nonporous Carbon As a Supercapacitor with Remarkable Energy Density and Cyclic Stability

Chanderpratap Singh, Amit Paul

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

We report transformation of a cost-effective nonporous carbon (NC) to an immense microporous carbon (IMC) employing a simple chemical activation route at 750 °C. N2 adsorption/desorption experiments revealed a remarkable increase in BET surface area (80-3030 m2 g-1) for successor nanomaterial (IMC) in comparison to precursor nanomaterial (NC) presumably due to enhanced accessibility of reaction surface area on carbon material for oxidants to react. In consequence, 250 times specific capacitance enhancement (2.5-605 F g-1 at 0.5 A g-1 current density) was observed in 2 M H2SO4 using a three-electrode configuration. Further, a massive specific capacitance of 1177 F g-1 with a remarkable energy density of 163 Wh kg-1 has been achieved by addition of hydroquinone in electrolyte with IMC (IMC@H2Q) employing a two-electrode configuration. Notably, a simple electrode potential dependent chemical reversibility for hydroquinone redox chemistry in the long term cyclic experiment (95% capacitance retention after 5000 cycles) has been demonstrated wherein a strong electric field helped to avoid agglomeration of hydroquinone molecules inside the nanomaterial while hydrogen bond formation in IMC@H2Q prevented chemical decomposition of benzoquinone and thus also provided efficient routes for electron/proton transport eluding annihilation of charge carriers.

Original languageEnglish
Pages (from-to)11367-11379
Number of pages13
JournalACS Sustainable Chemistry and Engineering
Volume6
Issue number9
DOIs
StatePublished - 4 Sep 2018
Externally publishedYes

Keywords

  • Electrochemical impedance spectroscopy
  • Energy density
  • Microporous carbon
  • Supercapacitor
  • Ultramicroporous carbon

ASJC Scopus subject areas

  • Chemistry (all)
  • Environmental Chemistry
  • Chemical Engineering (all)
  • Renewable Energy, Sustainability and the Environment

Fingerprint

Dive into the research topics of 'Immense Microporous Carbon@Hydroquinone Metamorphosed from Nonporous Carbon As a Supercapacitor with Remarkable Energy Density and Cyclic Stability'. Together they form a unique fingerprint.

Cite this