Ultrathin hierarchical porous carbon nanosheets for high-performance supercapacitors and redox electrolyte energy storage
Jayaramulu, Kolleboyina (Technical University of Munich. Department of Chemistry)
Dubal, Deepak P. (Institut Català de Nanociència i Nanotecnologia)
Nagar, Bhawna (Institut Català de Nanociència i Nanotecnologia)
Ranc, Vaclav (Palacky University Olomouc. Faculty of Science)
Tomanec, Ondrej (Palacky University Olomouc. Faculty of Science)
Petr, Martin (Palacky University Olomouc. Faculty of Science)
Datta, Kasibhatta Kumara Ramanatha (Palacky University Olomouc. Faculty of Science)
Zboril, Radek (Palacky University Olomouc. Faculty of Science)
Gómez-Romero, Pedro 1959- (Institut Català de Nanociència i Nanotecnologia)
Fischer, Roland A. (Technical University of Munich. Department of Chemistry)

Data:	2018
Resum:	The design of advanced high-energy-density supercapacitors requires the design of unique materials that combine hierarchical nanoporous structures with high surface area to facilitate ion transport and excellent electrolyte permeability. Here, shape-controlled 2D nanoporous carbon sheets (NPSs) with graphitic wall structure through the pyrolysis of metal-organic frameworks (MOFs) are developed. As a proof-of-concept application, the obtained NPSs are used as the electrode material for a supercapacitor. The carbon-sheet-based symmetric cell shows an ultrahigh Brunauer-Emmett-Teller (BET)-area-normalized capacitance of 21. 4 µF cm (233 F g), exceeding other carbon-based supercapacitors. The addition of potassium iodide as redox-active species in a sulfuric acid (supporting electrolyte) leads to the ground-breaking enhancement in the energy density up to 90 Wh kg, which is higher than commercial aqueous rechargeable batteries, maintaining its superior power density. Thus, the new material provides a double profits strategy such as battery-level energy and capacitor-level power density.
Ajuts:	Ministerio de Economía y Competitividad SEV-2013-0295 Ministerio de Economía y Competitividad MAT2015-68394-R Agència de Gestió d'Ajuts Universitaris i de Recerca 2014/SGR-1505
Nota:	ICN2 is funding from the CERCA Programme/Generalitat de Catalunya
Drets:	Tots els drets reservats.
Llengua:	Anglès
Document:	Article ; recerca ; Versió sotmesa a revisió
Matèria:	Graphitic nanoporous carbon sheets ; Metal-organic frameworks (MOFs) ; Morphology control ; Supercapacitors ; 2D materials
Publicat a:	Advanced materials, Vol. 30, issue 15 (April 2018) , art. 1705789, ISSN 1521-4095

DOI: 10.1002/adma.201705789

Preprint 21 p, 895.8 KB

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