Nature Research, Scientific Reports, 1(4), 2014
DOI: 10.1038/srep07349
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This work is licensed under a Creative Commons Attribution 4.0 International License. ; Earnest efforts have been taken to design hybrid energy storage devices using hybrid electrodes based on capacitive (rGO) and pseudocapacitive (Ni(OH)2 and Co(OH)2) materials deposited on the skeleton of 3D macroporous (indicate sponge material) sponge support. Conducting framework was formed by coating rGO on macroporous sponge on which subsequent deposition of Ni(OH)2 and Co(OH)2 was carried out. The synergetic combination of rGO and Ni(OH)2 or Co(OH)2) provides dual charge-storing mechanisms whereas 3D framework of sponge allows excellent accessibility of electrolyte to hybrid electrodes. Moreover, to further increase the energy density, hybrid devices have been fabricated with SP@rGO@Ni or SP@rGO@Co and SP@rGO as positive and negative electrodes, respectively. These hybrid devices operate with extended operating voltage windows and achieve remarkable electrochemical supercapacitive properties which make them truly promising energy storage devices for commercial production. ; Authors appreciate the award to DPD of a Humboldt Fellowship of the Alexander von Humboldt Foundation (AvH), Germany and the award of a Marie-Curie Fellowship through Beatriu de Pinos Program (BP-DGR-2013) for Catalan system of science and technology, Spain. Partial funding from Spanish Grant MAT2012-39199-C02-01 is gratefully acknowledged. ICN2 acknowledges support from the Severo Ochoa Program (MINECO, Grant SEV-2013-0295). ; Peer Reviewed