Ultrathin Hierarchical Porous Carbon Nanosheets for High‐Performance Supercapacitors and Redox Electrolyte Energy Storage |
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Authors: | Kolleboyina Jayaramulu Deepak P Dubal Bhawna Nagar Vaclav Ranc Ondrej Tomanec Martin Petr Kasibhatta Kumara Ramanatha Datta Radek Zboril Pedro Gómez‐Romero Roland A Fischer |
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Affiliation: | 1. Chair of Inorganic and Metal‐Organic Chemistry, Department of Chemistry and Catalysis Research Centre, Technical University of Munich, Garching, Germany;2. Regional Centre of Advanced Technologies and Materials, Faculty of Science, Palacky University Olomouc, Olomouc, Czech Republic;3. Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and the Barcelona Institute of Science and Technology, Bellaterra, Barcelona, Spain;4. School of Chemical Engineering, The University of Adelaide, Adelaide, South Australia, Australia |
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Abstract: | 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?2 (233 F g?1), 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?1, 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. |
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Keywords: | graphitic nanoporous carbon sheets metal– organic frameworks (MOFs) morphology control supercapacitors 2D materials |
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