Activated Carbon Modified with Carbon Nanodots as Novel Electrode Material for Supercapacitors

Vijay Bhooshan Kumar, Arie Borenstein, Boris Markovsky, Doron Aurbach, Aharon Gedanken, Michael Talianker, Zeev Porat

Research output: Contribution to journalArticlepeer-review

78 Scopus citations

Abstract

The main goal of this work was to modify activated carbon (AC) with carbon nanodots (C-dots) and to explore the modified composites as electrode materials for supercapacitors. C-dots were synthesized by sonication of polyethylene glycol followed by sonochemical modification of AC matrices with the preprepared C-dots. Sonication introduces the C-dots into the pores of the AC. The effect of the introduction of the C-dots into the AC and their incorporation into the pores was studied. The porosity of the AC/C-dots and the AC reference materials was explored, as well as the impact of the C-dot loading on the performance of the electrodes comprising these AC/C-dots. It was found that the AC/C-dot electrodes demonstrate a specific capacitance of 0.185 F/cm2 (per specific electrode area), three times higher than the capacitance of unmodified AC electrodes per specific electrode's area. It was established that the new electrode's material, namely, AC/C-dots, exhibits very stable electrochemical behavior. Many thousands of cycles could be demonstrated with stable capacity and a Coulombic efficiency of around 100%.

Original languageEnglish
Pages (from-to)13406-13413
Number of pages8
JournalJournal of Physical Chemistry C
Volume120
Issue number25
DOIs
StatePublished - 30 Jun 2016
Externally publishedYes

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