Asymmetric supercapacitor based on activated expanded graphite and pinecone tree activated carbon with excellent stability

Farshad Barzegar, Abdulhakeem Bello, Julien K. Dangbegnon, Ncholu Manyala and Xiaohua Xia

Applied Energy, 2017, vol. 207, issue C, 417-426

Abstract: This work presents results obtained from the production of low-cost carbons from expanded graphite (EG) and pinecone (PC) biomass, activated in potassium hydroxide (KOH) and finally carbonized in argon and hydrogen atmosphere. A specific surface area of 808m2g−1 and 457m2g−1 were measured for activated pinecone carbon (APC) and activated expanded graphite (AEG), respectively. The electrochemical characterization of the novel materials in a 2-electrode configuration as supercapacitor electrode shows a specific capacitance of 69Fg−1 at 0.5Ag−1, high energy density of 24.6Whkg−1 at a power density of 400Wkg−1. This asymmetric supercapacitor also exhibits outstanding stability after voltage holding at the maximum voltage for 110h, suggesting that the asymmetric device based on different carbon materials has a huge capacity for a high-performance electrode in electrochemical applications.

Keywords: Pine cones; Expanded graphite; Porous carbon; Supercapacitor; Energy storage; Activated carbon (search for similar items in EconPapers)
Date: 2017
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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DOI: 10.1016/j.apenergy.2017.05.110

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