Carbons, Ionic Liquids, and Quinones for Electrochemical Capacitors

Raül Díaz-Delgado, Andrew P. Doherty

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)
332 Downloads (Pure)


Carbons are the main electrode materials used in supercapacitors, which are electrochemical energy storage devices with high power densities and long cycling lifetimes. However, increasing their energy density capacity will improve their potential for commercial implementation.
In this regard, the use of high surface area carbons and high voltage electrolytes are well known strategies to increase the attainable energy density, and lately ionic liquids have been explored as promising alternatives to current state of the art acetonitrile-based electrolytes. Also, in terms of safety and sustainability ionic liquids are attractive electrolyte materials for supercapacitors. In addition, it has been shown that the matching of the carbon pore size with the electrolyte ion size further increases the attainable electrochemical double layer (ECDL) capacitance and energy density.
The use of pseudocapacitive reactions can significantly increase the attainable energy density, and quinonic-based materials offer a potentially sustainable and cost effective research avenue for both the electrode and the electrolyte.
This perspective will provide an overview of the current state of the art research on supercapacitors based on combinations of carbons, ionic liquids and quinonic compounds, highlighting performances and challenges and discussing possible future research avenues. In this regard, current interest is mainly focused on strategies which may ultimately lead to commercially competitive sustainable high performance supercapacitors for different applications including those requiring mechanical flexibility and biocompatibility.
Original languageEnglish
Article number18
Number of pages7
JournalFrontiers in Materials
Issue number3
Publication statusPublished - 19 Apr 2016

Bibliographical note

This is an invited review with the Spanish Energy institute in Madrid ( It not only presents that state of play in the field but aims to position out respective expertise for future collaboration e.g. H2020 energy-related calls.


  • capacitors
  • carbon
  • hybrid devices


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