Molybdate incorporated poly(acrylic acid) electrolytes for use in quasi-solid state carbon based supercapacitors: Redox-active polychelates. (10th September 2020)

• Record Type: Journal Article
• Authors: Shar, Sahar Saad; Cevik, Emre; Bozkurt, Ayhan; Yaman, Cevat; Almutari, Zeyad; Kayed, Tarek S.
• Is Part Of: Electrochimica acta. Volume 354(2020)
• Publication Date: 2020-09-10
• Subjects: Supercapacitor -- Flexible -- Molybdate -- Poly(acrylic acid) -- Polymer electrolyte; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2020.136770
• Languages: English
• ISSNs: 0013-4686

Abstract

Highlights: A novel polychelates based gel electrolyte was used for flexible supercapacitors. The specific capacitance of the device was improved up to 327.50 F g −1 . The same device maintained 94% of initial performance for 10.000 cycles. A coulombic efficiency was recorded around 96% when it reached about 10.000 cycles. Supercapacitor showed a remarkable cyclic and mechanical performance under bent and twisted conditions. Abstract: The use of poly (acrylic acid) (PAA) as a host matrix with a guest electroactive additive, ammonium molybdate, (Mo) is an interesting approach representing a novel redox active polymer-metal chelate electrolytes (polychelates). The quasi-solid state supercapacitors were made up of carbon composite electrodes (CC) and polychelates, PAA-MoX (X: 1, 3, 5, and 10) where X represents the doping fraction ( w/w ) of Mo in PAA. The excellent thermal stable structure of the polychelates was supported by high ionic conductivity and ideal bending-stretching properties, giving it a high compatibility for the supercapacitors. The supercapacitor device produced with PAA-Mo5 electrolyte showed a remarkable specific capacitance of 327.50 F g −1, almost 15 times better in performance compared to pure PAA device. The same device with a combination of CC/PAA-Mo5/CC provided an energy density of 45.49 Wh kg −1 at a power density of 251.92 W kg −1 . A remarkable loop stability of the PAA-Mo5 device was maintained after 94 charge-discharge cycles, with 94% of the initial performance. In addition, an LED light was successfully operated by a 1.5 × 3 cm size supercapacitor containing the PAA-Mo5 electrolyte. Graphical abstract: Image, graphical abstract