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Issue 4, 2008
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Performance and low temperature behaviour of hydrous ruthenium oxide supercapacitors with improved power densities

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Abstract

The performances of hydrous Ru oxide supercapacitors have been characterized by cyclic voltammetry, constant current discharge, and impedance experiments. The effective series resistance (ESR) was reduced to 0.10 Ω cm2 by using a Nafion®NRE 211 separator, providing a power density of over 100 kW kg−1 at 5 W h kg−1, calculated for discharge from 1.0 to 0.5 V. The maximum energy density was 21.8 W h kg−1 (31.2 W h kg−1 for discharge to 0 V). Both the ESR and electrode ionic resistance increased exponentially with decreasing temperature, while the specific capacitance decreased linearly from 770 F g−1 at 40 °C to 690 F g−1 at −40 °C. At −40 °C the energy loss at 500 W kg−1 was 15% relative to +25 °C.

Graphical abstract: Performance and low temperature behaviour of hydrous ruthenium oxide supercapacitors with improved power densities

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Publication details

The article was received on 12 Jun 2008, accepted on 11 Jul 2008 and first published on 05 Aug 2008


Article type: Paper
DOI: 10.1039/B809939A
Energy Environ. Sci., 2008,1, 494-500

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    Performance and low temperature behaviour of hydrous ruthenium oxide supercapacitors with improved power densities

    X. Liu and P. G. Pickup, Energy Environ. Sci., 2008, 1, 494
    DOI: 10.1039/B809939A

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