Highly porous graphitic materials prepared by catalytic graphitization
Highly porous graphitic materials prepared by catalytic graphitization
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催化石墨化制备高孔石墨材料
DOI：
10.1016/j.carbon.2013.07.044
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发表时间：
2013-11-01
期刊：
影响因子：
10.9
通讯作者：
Zhang, Di
中科院分区：
文献类型：
--
作者：
Liu, Yuanchao;Liu, Qinglei;Zhang, Di
在Ni的辅助下，通过催化石墨化法在固体活性炭颗粒内部生长出超薄石墨纳米结构。石墨纳米结构由3-8个石墨层组成，在无序碳框架的表面上形成高导电网络。由于所制备的石墨纳米结构的多孔特性，所得到的多孔石墨碳显示出高达1622 m2/g的高比表面积。详细的研究表明，石墨纳米结构的生长特征与催化温度以及Ni纳米颗粒的状态密切相关。在合适的催化温度下，粒径小于15 nm的Ni颗粒是形成石墨纳米结构的关键。此外，一个新的机制，提出了催化形成的石墨纳米结构。多孔石墨炭作为电化学电容器的电极材料，与其活性炭前驱体相比，具有更高的高倍率电容性能。(C)2013爱思唯尔有限公司保留所有权利。
Ultrathin graphitic nanostructures are grown inside solid activated carbon particles by catalytic graphitization method with the aid of Ni. The graphitic nanostructures consist of 3-8 graphitic layers, forming a highly conductive network on the surface of disordered carbon frameworks. Owing to the ultrathin characteristic of the produced graphitic nanostructures, the resulted porous graphitic carbons show a high specific surface area up to 1622 m(2)/g. A detailed investigation reveals that the features of the growing graphitic nanostructures are strongly associated with the catalytic temperature as well as the state of Ni nanoparticles. Some well-dispersed fine Ni particles with diameter below 15 nm are found to be the key to form the ultrathin graphitic nanostructures at appropriate catalytic temperature. Also, a novel mechanism is proposed for the catalytic formation of the ultrathin graphitic nanostructures. As the electrode material of electrochemical capacitors, the porous graphitic carbon exhibits much higher high-rate capacitive performance compared to its activated carbon precursor. (C) 2013 Elsevier Ltd. All rights reserved.