Formation of Carbon Nanosheets via Simultaneous Activation and Catalytic Carbonization of Macroporous Anion-Exchange Resin for Supercapacitors Application

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• 作者：Hui Peng ; Guofu Ma ; Kanjun Sun ; Jingjing Mu ; Zhe Zhang ; Ziqiang Lei
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2014
• 出版时间：December 10, 2014
• 年：2014
• 卷：6
• 期：23
• 页码：20795-20803
• 全文大小：595K
• ISSN：1944-8252

文摘

Two-dimensional mesoporous carbon nanosheets (CNSs) have been prepared via simultaneous activation and catalytic carbonization route using macroporous anion-exchange resin (AER) as carbon precursor and ZnCl₂ and FeCl₃ as activating agent and catalyst, respectively. The iron catalyst in the skeleton of the AER may lead to carburization to form a sheetlike structure during the carbonization process. The obtained CNSs have a large number of mesopores, a maximum specific surface area of 1764.9 m² g^鈥?, and large pore volume of 1.38 cm³ g^鈥?. As an electrode material for supercapacitors application, the CNSs electrode possesses a large specific capacitance of 283 F g^鈥? at 0.5 A g^鈥? and excellent rate capability (64% retention ratio even at 50 A g^鈥?) in 6 mol L^鈥? KOH. Furthermore, CNSs symmetric supercapacitor exhibits specific energies of 17.2 W h kg^鈥? at a power density of 224 W kg^鈥? operated in the voltage range of 0鈥?.8 V in 0.5 mol L^鈥? Na₂SO₄ aqueous electrolyte, and outstanding cyclability (retains about 96% initial capacitance after 5000 cycles).

Keywords:

carbon nanosheets; anion-exchange resin; activation; catalytic carbonization; supercapacitors