Synthesis of mesoporous carbon spheres with a hierarchical pore structure for the electrochemical double-layer capacitor
Synthesis of mesoporous carbon spheres with a hierarchical pore structure for the electrochemical double-layer capacitor
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DOI：
10.1016/j.carbon.2010.11.043
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发表时间：
2011-04-01
期刊：
影响因子：
10.9
通讯作者：
Zhao, Dongyuan
中科院分区：
文献类型：
--
作者：
Li, Qiang;Jiang, Rongrong;Zhao, Dongyuan
以酚醛树脂为碳源，Pluronic F127和球形二氧化硅介孔泡沫（Si-MCFs）分别为软硬模板剂，采用双模板法合成了具有分级泡沫状孔结构的介孔碳球。结果表明，所制备的二氧化硅模板的形貌和介观结构得到了忠实的复制。所得介孔碳材料的球形直径约为。3-5μ m具有分级的孔径（来自CA. 3.5 60 nm）、高比表面积（1320 m2/g）和大孔容（3.5 cm 3/g）。碳表面含有大量含氧基团，导致电极材料的亲水性。此外，Pluronic F127在合成中起着重要作用，以保持二氧化硅模板的泡沫状介观结构和球形形貌的忠实复制。电化学测试结果表明，介孔碳球作为电化学双电层电容器（EDLC）电极具有较长的循环寿命、优异的倍率性能和较高的比电容。在（2.0 M）H（2）SO（4）水溶液中，在0.5 A/g下为208 F/g。其比电容仍可保持在约1000 Ω。在30 A/g的高负载电流密度下，146 F/g，保留约为100 F/g。百分之七十此外，该材料在（C（2）H（5））（4）NBF（4）/碳酸丙烯酯电解质中也表现出优异的电容性能，并且在0.5A/g的负载电流密度下其比电容为97 F/g。(C)2010爱思唯尔有限公司版权所有。
Mesoporous carbon spheres with hierarchical foam-like pore structures have been synthesized by a dual-templating strategy using phenolic resol as a carbon source, Pluronic F127 and spherical silica mesocellular foams (Si-MCFs) as the soft and hard template, respectively. The results show that the morphology and mesostructure of the silica template are faithfully replicated. The obtained mesoporous carbon material with spherical diameter size of ca. 3-5 mu m exhibits hierarchical pore sizes (from ca. 3.5 to 60 nm), high specific surface area (1320 m(2)/g) and large pore volume (3.5 cm(3)/g). The carbon surface contains plenty of oxygen-containing groups, resulting in hydrophilic property for an electrode material. In addition, Pluronic F127 plays an important role in the synthesis for maintaining the foam-like mesostructure of the silica templates and faithful replication of the spherical morphology. The electrochemical measurements show that the hierarchically mesoporous carbon spheres as an electrochemical double-layer capacitor (EDLC) electrode present a long cyclic life, excellent rate capability, and high specific capacitance as ca. 208 F/g at 0.5 A/g in (2.0 M) H(2)SO(4) aqueous solution. Its specific capacitance can still remain ca. 146 F/g at a high loading current density of 30 A/g with the retention of ca. 70%. Furthermore, this material also exhibits excellent capacitive performance in (C(2)H(5))(4)NBF(4)/propylene carbonate electrolyte, and its specific capacitance is 97 F/g at loading current density of 0.5 A/g. (C) 2010 Elsevier Ltd. All rights reserved.