文献类型：期刊文献

英文题名：Porous carbon electrodes from activated wasted coffee grounds for capacitive deionization

作者：Qian, Min[1];Xuan, Xiao Yang[1];Pan, Li Kun[2];Gong, Shang Qing[1]

机构：[1]East China Univ Sci & Technol, Dept Phys, Sch Sci, Shanghai 200237, Peoples R China;[2]East China Normal Univ, Shanghai Key Lab Magnet Resonance, Sch Phys & Mat, Shanghai 200062, Peoples R China

年份：2019

卷号：25

期号：7

起止页码：3443

外文期刊名：IONICS

收录：;EI(收录号：20190806522021);WOS:【SCI-EXPANDED(收录号:WOS:000471637600046)】；

基金：This work is sponsored by the National Natural Science Foundation of China (Grant No. 61804054), the Natural Science Foundation of Shanghai (18ZR1410400), Shanghai Sailing Program (17YF1403300), and the Fundamental Research Funds for the Central Universities (Project No. 222201714017).

语种：英文

外文关键词：Capacitive deionization; Microporous carbon; Activated waste coffee grounds

摘要：Wasted coffee grounds (WCGs) were activated by a pyrolysis process using KOH, where the porosity increased with temperature, exhibiting a micropore-dominant structure. WCGs upon an activation temperature of 800 degrees C (AWCG800) showed a surface area up to 1856m(2)g(-1) and a specific capacitance of 180.3Fg(-1) in 1M NaCl solution at a scan rate of 10mVs(-1). The AWCG800 electrodes showed an electrosorption capacity up to 12.50 and 16.50mgg(-1) in NaCl solution at cell voltages of 1.2 and 1.4V, respectively, with an initial concentration of 5mM. X-ray photoelectron spectroscopy analysis indicated that AWCG800 maintained a high carbon content of 87at% upon the activation process. The study suggests a practical way for converting WCGs into mesoporous and microporous carbons with large surface area and pore volume, high carbon component, and good wettability to water, which is promising for capacitive deionization application.