High energy density supercapacitors using macroporous kitchen sponges

Wei Chen, Rakhi Raghavan Baby, Husam N. Alshareef

Research output: Contribution to journalArticlepeer-review

71 Scopus citations

Abstract

Macroporous, low-cost and recyclable kitchen sponges are explored as effective electrode platforms for supercapacitor devices. A simple and scalable process has been developed to fabricate MnO 2-carbon nanotube (CNT)-sponge supercapacitor electrodes using ordinary kitchen sponges. Two organic electrolytes (1 M of tetraethylammonium tetrafluoroborate (Et 4NBF 4) in propylene carbonate (PC), 1 M of LiClO 4 in PC) are utilized with the sponge-based electrodes to improve the energy density of the symmetrical supercapacitors. Compared to aqueous electrolyte (1 M of Na 2SO 4 in H 2O), the energy density of supercapacitors tripled in Et 4NBF 4 electrolyte, and further increased by six times in LiClO 4 electrolyte. The long-term cycling performance in different electrolytes was examined and the morphology changes of the electrode materials were also studied. The good electrochemical performance in both aqueous and organic electrolytes indicates that the MnO 2-CNT-sponge is a promising low-cost electrode for energy storage systems. © 2012 The Royal Society of Chemistry.
Original languageEnglish (US)
Pages (from-to)14394
JournalJournal of Materials Chemistry
Volume22
Issue number29
DOIs
StatePublished - 2012

ASJC Scopus subject areas

  • Materials Chemistry
  • Chemistry(all)

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