Synthesis and electrochemical capacitive properties of nitrogen-doped porous carbon micropolyhedra by direct carbonization of zeolitic imidazolate framework-11
Synthesis and electrochemical capacitive properties of nitrogen-doped porous carbon micropolyhedra by direct carbonization of zeolitic imidazolate framework-11
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DOI：
10.1016/j.materresbull.2015.02.028
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发表时间：
2015-06-01
影响因子：
5.4
通讯作者：
Chen, Jinhua
中科院分区：
文献类型：
--
作者：
Hao, Fei;Li, Li;Chen, Jinhua
以ZIF-11多面体为原料，采用直接碳化法制备了氮掺杂多孔碳微多面体（N-PCMPs），并采用熔融KOH活化法制备了N-PCMPs-A。利用扫描电镜、X射线衍射仪、X射线衍射仪、电子能谱仪和化学吸附仪对样品的形貌和微观结构进行了分析。电化学性能，其特征在于通过循环伏安法和恒电流充电/放电方法，在1.0 M的硫酸水溶液上的标准三电极系统。结果表明，与N-PCMPs相比，N-PCMPs-A具有更高的比表面积（2188 m2 g-1）和更好的电化学电容性能（307 F g-1 at 1.0 Ag-1）。N-PCMPs-A的质量比电容也高于大多数MOF衍生的碳、一些碳化物衍生的碳和碳气凝胶衍生的碳。此外，即使在10 A g（-1）的高电流密度下，N-PCMPs-A在4000次循环后的电容仍保持90%。这意味着N-PCMPs-A是构建高性能超级电容器的有前途的材料。(C)2015爱思唯尔有限公司版权所有。
Nitrogen-doped porous carbon micropolyhedra (N-PCMPs) were successfully prepared by direct carbonization of ZIF-11 polyhedra and further activated with fused KOH to obtain N-PCMPs-A. The morphology and microstructure of samples were examined by scanning electron microscopy, X-ray diffraction, and micropore and chemisorption analyzer. Electrochemical properties were characterized by cyclic voltammetry and galvanostatic charge/discharge method in 1.0 M H2SO4 aqueous solution on a standard three-electrode system. Results show that, compared with N-PCMPs, N-PCMPs-A has higher specific surface area (2188 m(2)g(-1)) and exhibits improved electrochemical capacitive properties (307 F g(-1) at 1.0 Ag-1). The mass specific capacitance of N-PCMPs-A is also higher than that of most MOF-derived carbons, some carbide-derived carbons and carbon aerogel-derived carbons. In addition, the capacitance of the N-PCMPs-A retains 90% after 4000 cycles even at a high current density of 10 A g(-1). These imply that N-PCMPs-A is the promising materials for the construction of a high-performance supercapacitor. (C) 2015 Elsevier Ltd. All rights reserved.