Synthesis of Ultrathin Nitrogen-Doped Graphitic Carbon Nanocages as Advanced Electrode Materials for Supercapacitor

详细信息    查看全文

• 作者：Yueming Tan ; Chaofa Xu ; Guangxu Chen ; Zhaohui Liu ; Ming Ma ; Qingji Xie ; Nanfeng Zheng ; Shouzhuo Yao
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2013
• 出版时间：March 27, 2013
• 年：2013
• 卷：5
• 期：6
• 页码：2241-2248
• 全文大小：514K
• 年卷期：v.5,no.6(March 27, 2013)
• ISSN：1944-8252

文摘

Synthesis of nitrogen-doped carbons with large surface area, high conductivity, and suitable pore size distribution is highly desirable for high-performance supercapacitor applications. Here, we report a novel protocol for template synthesis of ultrathin nitrogen-doped graphitic carbon nanocages (CNCs) derived from polyaniline (PANI) and their excellent capacitive properties. The synthesis of CNCs involves one-pot hydrothermal synthesis of Mn₃O₄@PANI core鈥搒hell nanoparticles, carbonization to produce carbon coated MnO nanoparticles, and then removal of the MnO cores by acidic treatment. The CNCs prepared at an optimum carbonization temperature of 800 掳C (CNCs-800) have regular frameworks, moderate graphitization, high specific surface area, good mesoporosity, and appropriate N doping. The CNCs-800 show high specific capacitance (248 F g^鈥? at 1.0 A g^鈥?), excellent rate capability (88% and 76% capacitance retention at 10 and 100 A g^鈥?, respectively), and outstanding cycling stability (95% capacitance retention after 5000 cycles) in 6 M KOH aqueous solution. The CNCs-800 can also exhibit great pseudocapacitance in 0.5 M H₂SO₄ aqueous solution besides the large electrochemical double-layer capacitance. The excellent capacitance performance coupled with the facile synthesis of ultrathin nitrogen-doped graphitic CNCs indicates their great application potential in supercapacitors.

Keywords:

carbon nanocage; nitrogen-doped carbon; polyaniline; pseudocapacitance; supercapacitor