Oriented and Interlinked Porous Carbon Nanosheets with an Extraordinary Capacitive Performance

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• 作者：Xiaoyu Zheng ; Wei Lv ; Ying Tao ; Jiaojing Shao ; Chen Zhang ; Donghai Liu ; Jiayan Luo ; Da-Wei Wang ; Quan-Hong Yang
• 刊名：Chemistry of Materials
• 出版年：2014
• 出版时间：December 9, 2014
• 年：2014
• 卷：26
• 期：23
• 页码：6896-6903
• 全文大小：722K
• ISSN：1520-5002

文摘

Highly porous carbon nanosheets that are oriented and interlinked are prepared by a one-step KOH activation of polymerized glucose spheres (pGSs) that are hydrothermally derived from glucose at 180 掳C yet without carbonization. This is totally unexpected because a spherical microporous carbon is produced by a normally employed two-step process that includes a precarbonization and a successive KOH activation. In our one-step activation, the melt of potassium species directed the formation of oriented carbon nanosheets; the oxygen constituents in the pGSs are critical for the morphological evolution from sphere to sheet. The carbon nanosheets have a large surface area (2633 m² g^鈥?) and a high pore volume (1.86 cm³ g^鈥?). The oriented structure and hierarchical porosity impose advantages for mass transfer and ion accommodation and give rise to an ultrahigh rate performance (184 F g^鈥? at 100 A g^鈥?) of the carbon nanosheets in supercapacitors in comparison with the case of microporous carbon spheres (56 F g^鈥? at 100 A g^鈥?).