Energy storage in electrochemical capacitors: designing functional materials to improve performance

Peter J. Hall, Mojtaba Mirzaeian, S. Isobel Fletcher, Fiona B. Sillars, Anthony J. R. Rennie, Gbolahan O. Shitta-Bey, Grant Wilson, Andrew Cruden, Rebecca Carter

Research output: Contribution to journalArticlepeer-review

867 Citations (Scopus)


Electrochemical capacitors, also known as supercapacitors, are becoming increasingly important components in energy storage, although their widespread use has not been attained due to a high cost/ performance ratio. Fundamental research is contributing to lowered costs through the engineering of new materials. Currently the most viable materials used in electrochemical capacitors are biomass-derived and polymer-derived activated carbons, although other carbon materials are useful research tools. Metal oxides could result in a step change for electrochemical capacitor technology and is an exciting area of research. The selection of an appropriate electrolyte and electrode structure is fundamental in determining device performance. Although there are still many uncertainties in understanding the underlying mechanisms involved in electrochemical capacitors, genuine progress continues to be made. It is argued that a large, collaborative international research programme is necessary to fully develop the potential of electrochemical capacitors.

Original languageEnglish
Pages (from-to)1238-1251
Number of pages14
JournalEnergy & Environmental Science
Issue number9
Early online date2 Aug 2010
Publication statusPublished - Sep 2010


  • temperature ionic liquids
  • double-layer capacitance
  • nanotube film substrate
  • hydrous ruthenium oxide
  • activated carbon
  • electrode material
  • mesoporous carbons
  • manganese oxide
  • vanadium-oxide
  • molten salts


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