A New Charge Storage Mechanism for Electrochemical Capacitors

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Abstract
The hydrous form of ruthenium oxide has been demonstrated to be an excellent electrode material for electrochemical capacitors. This material, as prepared by a sol‐gel process at low temperatures, is amorphous and electrically conductive. The specific capacitance is over . This value is at least two times higher than the highest value ever reported for such materials. The charge storage mechanism is believed to involve bulk electrochemical protonation of the oxide. This discovery opens a new avenue of research in the field of high energy density electrochemical capacitors.

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