Journal
ELECTROCHEMISTRY COMMUNICATIONS
Volume 24, Issue -, Pages 35-38Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2012.08.003
Keywords
Polyoxometalates; Hybrid organic-inorganic materials; Supercapacitor; Pseudocapacitance; Redox activity; Potential limits
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Funding
- Juan de la Cierva from Secretaria de Estado de I + D + i [MAT2011-28931]
- JAE-CSIC fellowship
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Hybrid electroactive materials based on polyoxometalate-adsorbed activated carbons have been developed for the first time as electrodes for supercapacitors. By combining the double layer capacitance of a high-surface area material with the reversible redox activity of a polyoxometalate (POM), enhanced electrochemical performance is obtained. In this paper, phosphomolybdic acid H3PMo12O40 (PMo12) was anchored to an activated carbon providing 160 F g(-1) and 183 F g(-1) for the positive and negative hybrid electrodes, respectively (at 2 A g(-1)), substantially larger than the 136 F g(-1) of the unmodified activated carbon. This translates to a cell capacitance for the AC-POM supercapacitor is 45 F g versus 35 F g(-1) for the AC supercapacitor, i.e. a 29% increase after POM integration into the AC matrix. (C) 2012 Elsevier B.V. All rights reserved.
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