Hierarchical Polyaniline Spikes over Vegetable Oil derived Carbon Aerogel for Solid-State Symmetric/Asymmetric Supercapacitor. (20th June 2017)

• Record Type: Journal Article
• Authors: Sahu, Vikrant; Marichi, Ram Bhagat; Singh, Gurmeet; Sharma, Raj Kishore
• Is Part Of: Electrochimica acta. Volume 240(2017)
• Page Start: 146
• Page End: 154
• Publication Date: 2017-06-20
• Subjects: carbon aerogel -- polyaniline spikes -- bio-mass derived/vegetable oil -- solid-state symmetric/asymmetric supercapacitor; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2017.04.058
• Languages: English
• ISSNs: 0013-4686

Abstract

Graphical abstract: Abstract: 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 cm −3 ) and high specific surface area (1032 m 2 g −1 ). The CA comprises of meso/microporosity with open pore microstructure. Symmetric supercapacitor cell (CA║CA) is fabricated to test the capacitive performance of CA in H2 SO4 -polyvinyl alcohol (H2 SO4 -PVA) gel as electrolyte. The CA║CA cell exhibits nearly symmetrical voltammograms up to working potential window of 2 V and impedance response demonstrates phase angle ∼80° 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-PANI║CA-PANI) and asymmetric (CA║CA-PANI) supercapacitor cells are fabricated to examine the electrochemical performance. Fabricated CA║CA-PANI supercapacitor cell exhibits remarkable high power density (7.9 kW kg −1 ) and high energy density (55.6 Wh kg −1 ). The CA║CA-PANI cell is capable to power a light-emitting diode (LED) bulb effectively for 3.5 min by assembling two supercapacitors (1 × 1 cm 2 ).