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Wednesday, 04 December 2013

A hybrid boost to supercapacitors

Carbon and inorganic nanoclusters add up to durable supercapacitor electrodes with increased energy an power densities

Combining activated carbon (AC) electrodes with oxide nanoclusters (polyoxometalates), researchers from the NEO-Energy Group, led by professor P. Gomez-Romero have developed hybrid supercapacitors outperforming conventional ones in every way.

The faradaic electroactivity of polyoxometalates, added to the double-layer capacitive energy storage mechanism of carbon electrodes lead to increased capacitance. But in addition, the use of phosphotungstic acid clusters leads to a remarkable increase in operating voltage, up to 1.6 V (unherd of for systems with aqueous acidic electrolytes like these). All together results in higher energy and power densities with respect to conventional AC electrodes. Furthermore these hybrid supercapacitors can cycle for more than 30,000 cycles with no loss of performance. This work has been published in Journal of Materials Chemistry A.

For more information, please contact:

Prof Pedro GOMEZ-ROMERO Full Research Professor CSIC

Novel Energy-Oriented Materials NEO-Energy ( www.neoenergy.cat)

Tel: +34 937 373 608

E-mail: pedro.gomez@cin2.es

Funding acknowledgement: Ministry of Economy and Competitiveness (Spain) Grant MAT2012-39199-C02-01.

Link to the Journal of Materials Chemistry A paper DOI:10.1039/C3TA14455K:

Hybrid Energy Storage: High Voltage Aqueous Supercapacitors based on Activated Carbon / Phosphotungstate Hybrid Materials