کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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6471267 | 1424117 | 2017 | 9 صفحه PDF | دانلود رایگان |
Herein, we report an environment friendly methodology for the synthesis of carbon aerogel (CA) using bio-mass (mustard oil) as precursor. The synthesis process is highly reproducible and economical yet devoid of any sophisticated procedure and hazardous organic/inorganic chemicals. Exfoliated graphitic planes of carbon beads with enhanced inter-planer spacing are observed in synthesized CA with low bulk density (0.144 g cmâ3) and high specific surface area (1032 m2 gâ1). The CA comprises of meso/microporosity with open pore microstructure. Symmetric supercapacitor cell (CAâCA) is fabricated to test the capacitive performance of CA in H2SO4-polyvinyl alcohol (H2SO4-PVA) gel as electrolyte. The CAâCA cell exhibits nearly symmetrical voltammograms up to working potential window of 2âV and impedance response demonstrates phase angle â¼80° indicating highly capacitive behavior. Polyaniline (PANI) spikes are further synthesized over CA using chemical oxidative polymerization route to introduce pseudocapacitive characteristics in addition to double layer capacitance. Solid-state symmetric (CA-PANIâCA-PANI) and asymmetric (CAâCA-PANI) supercapacitor cells are fabricated to examine the electrochemical performance. Fabricated CAâCA-PANI supercapacitor cell exhibits remarkable high power density (7.9 kW kgâ1) and high energy density (55.6 Wh kgâ1). The CAâCA-PANI cell is capable to power a light-emitting diode (LED) bulb effectively for 3.5 min by assembling two supercapacitors (1 Ã 1 cm2).
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Journal: Electrochimica Acta - Volume 240, 20 June 2017, Pages 146-154