点击次数：

论文类型：期刊论文

发表时间：2009-09-01

发表刊物：ASIA-PACIFIC JOURNAL OF CHEMICAL ENGINEERING

收录刊物：SCIE、EI、Scopus

卷号：4

期号：5,SI

页面范围：654-659

ISSN号：1932-2143

关键字：supercapacitors; ordered mesoporous carbons; pore structure

摘要：In the present study, two mesoporous carbons OMC-KIT-6 and OMC-SBA-16 were nanocasted using mesoporous silica of KIT-6 and SBA-16 as templates and furfuryl alcohol as carbon precursor. Transmission electron microscopy (TEM) and X-ray diffraction (XRD) characterizations confirmed that the resultant samples are mesoporous carbons, and the as-prepared OMC-KIT-6 has an Ia3d ordered structure, whereas OMC-SBA-16 belongs to Im3m space group. The surface area and the average pore size are (1658 m(2) g(-1) and 3.4 nm) for OMC-KIT-6 and (1638 m(2) g(-1) and 2.9 nm) for OMC-SBA-16, respectively. The results of cyclic voltammograrns and galvanostatic charge-discharge tests show that these two mesoporous carbons have excellent capacitive performances. But the difference of capacitive behavior between OMC-KIT-6 and OMC-SBA-16 may be a result of the difference of pore geometries of these two carbons. In order to find out the function of mesopore in a supercapacitor, we compared the capacitive properties of mesoporous and microporous carbons the experiment results indicated that these two kinds of carbon exhibit nearly ideal capacitive behavior at low scan rate. When the scan rate is enhanced up to 50 mV s(-1) the performance of mesoporous carbon is more stable than microporous carbon. This outcome demonstrated that mesopore plays an important role in forming double layers in the electrode materials. (c) 2009 Curtin University of Technology and John Wiley & Sons, Ltd.