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Graphitic Petal Electrodes for All‐Solid‐State Flexible Supercapacitors
Author(s) -
Xiong Guoping,
Meng Chuizhou,
Reifenberger Ronald G.,
Irazoqui Pedro P.,
Fisher Timothy S.
Publication year - 2014
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201300515
Subject(s) - materials science , supercapacitor , capacitance , polyaniline , electrode , current density , power density , chemical engineering , nanotechnology , analytical chemistry (journal) , composite material , polymer , power (physics) , organic chemistry , chemistry , physics , quantum mechanics , engineering , polymerization
The charge storage characteristics of a composite nanoarchitecture with a highly functional 3D morphology are reported. The electrodes are formed by the electropolymerization of aniline monomers into a nanometer‐thick polyaniline (PANI) film that conformally coats graphitic petals (GPs) grown by microwave plasma chemical vapor deposition (MPCVD) on conductive carbon cloth (CC). The hybrid CC/GPs/PANI electrodes yield results near the theoretical maximum capacitance for PANI of 2000 F g −1 (based on PANI mass) and a large area‐normalized specific capacitance of ≈2.6 F cm −2 (equivalent to a volumetric capacitance of ≈230 F cm −3 ) at a low current density of 1 A g −1 (based on PANI mass). The specific capacitances remain above 1200 F g −1 (based on PANI mass) for currents up to 100 A g −1 with correspondingly high area‐normalized values. The hybrid electrodes also exhibit a high rate capability with an energy density of 110 Wh kg −1 and a maximum power density of 265 kW kg −1 at a current density of 100 A g −1 . Long‐term cyclic stability is good (≈7% loss of initial capacitance after 2000 cycles), with coulombic efficiencies >99%. Moreover, prototype all‐solid‐state flexible supercapacitors fabricated from these hybrid electrodes exhibit excellent energy storage performance.