| 浓硫酸脱水还原制备石墨烯及其电容性能 |
| Influence of the Sulfuric Acid Dehydration Process on the Performance of Graphene-based Supercapacitors |
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| 摘要: 利用浓硫酸的脱水性能,在低温下快速处理氧化石墨烯得到硫酸脱水还原石墨烯材料.研究了不同处理方法对材料结构和电容性能的影响.结果表明:一步浓硫酸脱水法对氧化石墨烯的还原效果和水合肼相当;经过稀硫酸开环预处理后,浓硫酸(70℃,30min)对氧化石墨烯表面含氧官能团的脱除效果更加明显.两步硫酸脱水还原法得到样品的还原程度更高,堆积层数少;形成的石墨微晶区域的数量多,尺寸小.电容测试结果表明,对比于传统的水合肼还原法,浓硫酸脱水法得到的石墨烯材料有更好的电化学性能;两步浓硫酸脱水法得到石墨烯电极材料的比电容为321.8F·g-1,经1000次循环伏安测试后,电容保持率为89.7%. |
| 关键词: 多层石墨烯 浓硫酸 脱水还原 开环反应 电化学性能 |
| 基金项目: 国家自然科学基金(No.21361020);宁夏自然科学基金资助项目(No.NZ12156);中国科学院大连化学物理研究所催化基础国家重点实验室开放课题研究基金(N-09-13);宁夏大学提升综合实力建设项目(No.8016-18)资助项目 |
| Abstract: The multilayer dehydrated reduced graphenes oxide (DRGO) were prepared by a simple and fast treatment of graphene oxide(GO) with sulfuric acid and were used as electrode materials for supercapacitor. Areduction process was devised through a two-step reduction of graphene oxide: first in aqueous sulfuric acid and then in concentrated sulfuric acid at 70 ℃, 30 min. The results showed that the type, amount of oxygen functionalities and newly formed sp2 domains were different for one-pot and two-step reduction of graphene oxide. The high reduction degree DRGOelectrode with less restacked layers and smaller size sp2 domains exhibits a high specific capacitance of 321.8 F·g-1 at a scan rate of 10 mV·s-1, and an excellent cycling stability along with 89.7% specific capacitane retained after 1000 cycle tests. This facile and low cost method makes the DRGOa potential candidate in applications of electrochemical capacitors. |
| Keywords: multilayer grapheme concentrated sulfuric acid dehydration ring-opening reaction supercapacitor |
| 投稿时间：2014-06-14 修订日期：2014-09-10 |
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| 罗民,丁肖怡,窦元运,赵亮,梁斌,梁军.浓硫酸脱水还原制备石墨烯及其电容性能[J].无机化学学报,2015,31(1):54-60. |
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