硝酸改性无灰煤基多孔炭电极材料的制备
TQ424; 以褐煤基无灰煤为原料,采用KOH 活化法制备多孔炭材料(PC),通过不同浓度 HNO3对多孔炭进行氧化改性,利用N2等温吸附、扫描电子显微镜(SEM)、X射线光电子能谱(XPS)等方法对多孔炭进行表征,结合恒流充放电(GC)、循环伏安(CV)和交流阻抗的测试结果,考察浓度对多孔炭孔结构、表面性质以及电化学性能的影响.研究表明,随着 HNO3浓度的增加,多孔炭的比表面积逐渐降低,润湿性提高;用1% HNO3改性的多孔炭N-5、C—O 及 O—C =O 含量增加明显,在50 mA/g 的电流密度下,比电容可达273 F/g,相比未改性的多孔炭,比电容量增长了22.4%;在5000 m...
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| Published in | 功能材料 Vol. 49; no. 5; pp. 5137 - 5144 |
|---|---|
| Main Authors | , , , , |
| Format | Journal Article |
| Language | Chinese |
| Published |
华北理工大学 化学工程学院,河北 唐山063210
30.05.2018
河北省环境光电催化材料重点实验室,河北 唐山063210%华北理工大学 化学工程学院,河北 唐山,063210 |
| Subjects | |
| Online Access | Get full text |
| ISSN | 1001-9731 |
| DOI | 10.3969/j.issn.1001-9731.2018.05.024 |
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| Abstract | TQ424; 以褐煤基无灰煤为原料,采用KOH 活化法制备多孔炭材料(PC),通过不同浓度 HNO3对多孔炭进行氧化改性,利用N2等温吸附、扫描电子显微镜(SEM)、X射线光电子能谱(XPS)等方法对多孔炭进行表征,结合恒流充放电(GC)、循环伏安(CV)和交流阻抗的测试结果,考察浓度对多孔炭孔结构、表面性质以及电化学性能的影响.研究表明,随着 HNO3浓度的增加,多孔炭的比表面积逐渐降低,润湿性提高;用1% HNO3改性的多孔炭N-5、C—O 及 O—C =O 含量增加明显,在50 mA/g 的电流密度下,比电容可达273 F/g,相比未改性的多孔炭,比电容量增长了22.4%;在5000 mA/g的电流密度下,比电容保持率能达到80.4%,且在1000次循环后,比电容仍具有95.2%的保持率,具有良好的电化学性能. |
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| AbstractList | TQ424; 以褐煤基无灰煤为原料,采用KOH 活化法制备多孔炭材料(PC),通过不同浓度 HNO3对多孔炭进行氧化改性,利用N2等温吸附、扫描电子显微镜(SEM)、X射线光电子能谱(XPS)等方法对多孔炭进行表征,结合恒流充放电(GC)、循环伏安(CV)和交流阻抗的测试结果,考察浓度对多孔炭孔结构、表面性质以及电化学性能的影响.研究表明,随着 HNO3浓度的增加,多孔炭的比表面积逐渐降低,润湿性提高;用1% HNO3改性的多孔炭N-5、C—O 及 O—C =O 含量增加明显,在50 mA/g 的电流密度下,比电容可达273 F/g,相比未改性的多孔炭,比电容量增长了22.4%;在5000 mA/g的电流密度下,比电容保持率能达到80.4%,且在1000次循环后,比电容仍具有95.2%的保持率,具有良好的电化学性能. |
| Abstract_FL | Hyper coal (HPC)was used to prepare porous carbon(PC)by KOH activation method.Then the PC was modified by different concentrations of HNO3.N2adsorption instrument,scanning electron microscopy (SEM)and X-ray photoelectron spectroscopy(XPS)were used to characterize the pore structure.Galvanostatic charge/discharge(GC),cyclic voltammetry (CV)and electrochemical impedance spectroscopic analyses were used to test the electrochemical properties of PC.The results show that BET surface area of porous carbon de-crease and wettability improved with the increase of HNO3 concentration.The contents of N-5,C—O and O—C =O increase significantly when the PC was modified by 1% HNO3.Specific capacitance of PC is 273 F/g at a current density of 50 mA/g with the concentrations of 1%,which is 22.4% higher than that of the unmodified PC.It still maintains 80.4% at a current density of 5 000 mA/g.Even after 1 000 cycles,it is clear that the spe-cific capacitance still remains at about 9 5.4%,demonstrating good electrochemical performance. |
| Author | 侯彩霞 许立军 樊丽华 郭秉霖 孔碧华 |
| AuthorAffiliation | 华北理工大学 化学工程学院,河北 唐山063210;河北省环境光电催化材料重点实验室,河北 唐山063210%华北理工大学 化学工程学院,河北 唐山,063210 |
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| Author_FL | GUO Binglin HOU Caixia KONG Bihua FAN Lihua XU Lijun |
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| DocumentTitle_FL | Preparation of hyper coal-porous carbon electrode material with HNO3 modification |
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| Keywords | 无灰煤 超级电容器 porous carbon 多孔炭 hyper coal 硝酸氧化 surface functional groups 表面官能团 nitric acid oxidation supercapacitor |
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| Title | 硝酸改性无灰煤基多孔炭电极材料的制备 |
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