期刊
ACS APPLIED MATERIALS & INTERFACES
卷 7, 期 6, 页码 3684-3690出版社
AMER CHEMICAL SOC
DOI: 10.1021/am5081919
关键词
waste coffee grounds; carbon nanosheet; porous carbon; supercapacitor
资金
- National Research Foundation of Korea - Korean government (MEST) [NRF-2010-C1AAA001-0029018]
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education [NRF-2013R1A1A2A10008534]
- Core Technology of Materials - Ministry of Trade, Industry & Energy, Republic of Korea [10050858]
- Korea Evaluation Institute of Industrial Technology (KEIT) [10050858] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2013R1A1A2A10008534, 22A20130012832, 2014R1A2A1A12067266, 2009-00514] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
he nanostructure design of porous carbon-based electrode materials is key to improving the electrochemical performance of supercapacitors. In this study, hierarchically porous carbon nanosheets (HP-CNSs) were fabricated using waste coffee grounds by in situ carbonization and activation processes using KOH. Despite the simple synthesis process, the HP-CNSs had a high aspect ratio nanostructure (similar to 20 nm thickness to several micrometers in lateral size), a high specific surface area of 1945.7 m(2) g(-1), numerous heteroatoms, and good electrical transport properties, as well as hierarchically porous characteristics (0.510 nm in size). HP-CNS-based supercapacitors showed a specific energy of 35.4 Wh kg(-1) at 11250 W kg(-1) and of 23 Wh kg(-1) for a 3 s charge/discharge current rate corresponding to a specific power of 30000 W kg(-1). Additionally, the HP-CNS supercapacitors demonstrated good cyclic performance over 5000 cycles.
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