物理化学学报Issue(12)：2263-2271,9.DOI:10.3866/PKU.WHXB201410141
功能化石墨烯/活性炭复合电极及不对称电容器脱盐
Functionalized Graphene/Activated Carbon Composite Electrodes for Asymmetric Capacitive Deionization
摘要
Abstract
Aminated graphene (GP-NH2) was fabricated via the modification of graphite oxide (GO) with 3-aminopropyltriethoxysilane (AMPTS), and the covalent grafting of the amine functional groups was confirmed using Fourier transform infrared (FTIR) spectroscopy and energy-dispersive X-ray (EDX) spectroscopy. The aminated graphene (GP-NH2)/activated carbon (AC) composite electrode (GP-NH2/AC) was prepared, using the GP-NH2 as an additive. An AC||GP-NH2/AC asymmetric capacitor for capacitor deionization was then assembled using the GP-NH2/AC electrode as the positive electrode and AC as the negative electrode. A salt removal of 7.63 mg∙g-1 was achieved using the AC||GP-NH2/AC capacitor, and current efficiency was increased to 77.6%. A GP-SO3H/AC electrode was then prepared by mixing AC with sulfonated GP. With GP-NH2/AC as the positive electrode, and GP-SO3H/AC as the negative electrode, a GP-SO3H/AC||GP-NH2/AC asymmetric capacitor was assembled for capacitive deionization. An average desalting rate of 0.99 mg∙g-1∙min-1 was achieved, almost five times higher than that achieved using an AC||AC symmetric capacitor. The charge-discharge rate showed a 30%increase. The existence of the intrinsic charge on the electrode surface greatly inhibited the migration of counter ions, so that the current efficiency was significantly enhanced (to 92.8%) in comparison with the value achieved using an AC||AC capacitor (40%). These results demonstrated that the functionalized graphene in the AC electrode not only enhanced the conductivity, but also control ed the selective adsorption of ions, thereby significantly improving the deionization performance.关键词
胺化石墨烯/磺化石墨烯/不对称电容器/电容器脱盐Key words
Aminated graphene/Sulfonated graphene/Asymmetric capacitor/Capacitive deionization分类
化学化工引用本文复制引用
卢淼,刘建允,程健,王世平,杨健茂..功能化石墨烯/活性炭复合电极及不对称电容器脱盐[J].物理化学学报,2014,(12):2263-2271,9.基金项目
The project was supported by the National Natural Science Foundation of China (21476047,21105009), Foundation of State Key Laboratory of Electroanalytical Chemistry, China (SKLEAC201205), and Fundamental Research Funds for the Central Universities, China (2232012A3-05).国家自然科学基金(21476047,21105009),电分析国家重点实验室课题(SKLEAC201205)和中央高校基本科研业务费专项资金(2232012A3-05)资助 （21476047,21105009）
