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Oxygen‐Rich Non‐Graphitic Carbon Derived from Citrus sinensis for High‐Energy Density Pseudocapacitive Charge Storage
Author(s) -
Tiwari Bhumika,
Joshi Akanksha,
Mohan Priyank,
Kishore Sharma Raj,
Singh Gurmeet
Publication year - 2020
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.202004098
Subject(s) - materials science , supercapacitor , carbon fibers , porosity , chemical engineering , raman spectroscopy , x ray photoelectron spectroscopy , oxygen , electrochemistry , specific surface area , nanotechnology , electrode , chemistry , catalysis , composite material , organic chemistry , physics , optics , composite number , engineering
Non‐graphitic carbon is a potential supercapacitor electrode material attributed to the combination of dense porous structure and high surface area. However, production cost limits its high usage. Herein, inexpensive and sustainable flavonoids rich precursor Citrus sinensis is utilized for synthesis of non‐graphitic carbon and is characterised using XRD, Raman, XPS & BET. For controlled porosity, KOH activation at two different temperatures (750 °C & 900 °C) is carried out that result in controlled meso/macro porous carbon with 900 °C activation (AC‐900). The edges of pores with dangling oxygen functionalities (37 %) contributes to pseudocapacitive charge (385.91 F g −1 ) whereas meso/macro pore size distribution facilitates fast diffusion (0.78 × 10 −9 cm 2 s −1 ) in symmetric cell (AC‐900||AC‐900). Furthermore, an impressively high energy density (51.1 Wh kg −1 @ 0.75 A g −1 ) is obtained owing to this blend of controlled porous structure and oxygen functionalities. In future, this study will pave a path for designing of low cost non‐graphitic controlled porous structure carbon.