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Ultrathin Hierarchical Porous Carbon Nanosheets for High‐Performance Supercapacitors and Redox Electrolyte Energy Storage
Advanced Materials ( IF 27.4 ) Pub Date : 2018-03-08 , DOI: 10.1002/adma.201705789
Kolleboyina Jayaramulu 1, 2 , Deepak P. Dubal 3, 4 , Bhawna Nagar 3 , Vaclav Ranc 2 , Ondrej Tomanec 2 , Martin Petr 2 , Kasibhatta Kumara Ramanatha Datta 2 , Radek Zboril 2 , Pedro Gómez-Romero 3 , Roland A. Fischer 1
Affiliation  

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.

中文翻译:

用于高性能超级电容器和氧化还原电解质储能的超薄分层多孔碳纳米片

先进的高能量密度超级电容器的设计要求设计独特的材料,这些材料结合了具有高表面积的分层纳米多孔结构,以促进离子传输和出色的电解质渗透性。在这里,通过金属-有机骨架(MOF)的热解,开发了具有石墨壁结构的形状可控的二维纳米多孔碳板(NPS)。作为概念验证应用,获得的NPS用作超级电容器的电极材料。基于碳片的对称电池显示超高的Brunauer-Emmett-Teller(BET)区域归一化电容为21.4 µF cm -2(233 F g -1),超过其他基于碳的超级电容器。在硫酸(支持电解质)中添加碘化钾作为氧化还原活性物质,可以使突破性的能量密度提高到90 Wh kg -1,这比商用水性充电电池要高,从而保持了其卓越的功率密度。因此,这种新材料提供了双赢策略,例如电池级能量和电容器级功率密度。
更新日期:2018-03-08
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