Directly carbonized lotus seedpod shells as high-stable electrode material for supercapacitors

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• 作者：Jun Pu ; Wei Kong ; Chenchen Lu ; Zhenghua Wang
• 关键词：Biomass shells ; Carbonization ; Porous carbon ; EDLCs ; Stability
• 刊名：Ionics
• 出版年：2015
• 出版时间：March 2015
• 年：2015
• 卷：21
• 期：3
• 页码：809-816
• 全文大小：2,668 KB
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• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Electrochemistry
  Materials Science
  Physical Chemistry
  Condensed Matter
  Renewable Energy Sources
  Electrical Power Generation and Transmission
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1862-0760

文摘

In this work, we demonstrate a simple and effective activation-free carbonization method to prepare porous carbon from lotus seedpod shell―a kind of natural biomass. It reveals that the carbonization temperature plays a crucial role in the determination of surface areas and capacitive performances of as-obtained porous carbon samples. The pore size and specific surface area of the samples were measured to be in the ranges of 2.0-.2?nm and 261.7-63.4?m2?g?, respectively. The carbon sample obtained at a carbonization temperature of 600?°C (carbon-600) exhibits the maximum Barrett–Emmett–Teller (BET) surface area of 563.4?m2?g? and the highest specific capacitance of 165?F?g? at a current density of 0.5?A?g?. More importantly, the carbon-600 sample reveals unexceptionable capacitance retention of 95.3?% after 10,000 charge–discharge cycles, clearly indicating its excellent cycling stability. This work gives a simple and efficient approach for producing cost-effective porous carbons with high performance for supercapacitors.