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Seyda Tugba Gunday,M. A. Almessiere,Hamide Aydın,Ayhan Bozkurt 한국고분자학회 2019 Macromolecular Research Vol.27 No.7
The design of novel proton exchange membranes with high conductivity and better dimensional stability has become increasingly important due to the need for applications in different devices. The present work shows the acid-doped and crosslinked polyacrylamide (PAM) networks including flexible spaces. To this end PAM was modified with 1,4-butanediol diglycidyl ether (BG) to form PAM35BG and PAM50BG networks, which would afford more space for protonated solvents. The reaction of PAM with BG was monitored by FTIR and 13C CP-MAS NMR. The polymer electrolytes were produced by acid doping at several stoichiometric ratios with respect to the monomer repeat unit of a host polymer. The resulting materials exhibited better thermal, chemical, and electrochemical stabilities and had distinct T g values. Additionally, the pores of the PAM-BG materials were filled with H3PO4 to get PAM35BG0.5H3PO4 and PAM50BG1.0H3PO4. The doping enhanced the proton conductivities of the membranes as high as 0.003 S/cm at 120 oC under an anhydrous atmosphere. The proton diffusion mechanism and the dielectric relaxation were further examined using the complex modulus formalism, M*.
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Seyda T. Gunday,Emre Cevik,Ismail Anil,Omar Alagha,Hussein Sabit,Ayhan Bozkurt 한국고분자학회 2020 Macromolecular Research Vol.28 No.12
The current research aimed to produce anhydrous gel organic electrolytes with superior performance for high-temperature supercapacitor applications. Within this scope, anhydrous electrolytes were designed by the termination of 1,4- butanediol diglycidyl ether (BDE) with 5-aminotetrazole (AT). The BDE(AT)2 was further doped with phosphoric acid (PA) and 1-Ethyl-3-methylimidazolium tetrafluoroborate (EMT, as an ionic liquid) at varied ratios. The structure of fabricated electrolytes was elucidated with various spectroscopic techniques, and thermal studies confirmed high thermal stabilities and low glass transition temperatures, suggesting that they could be used in a wide temperature range. Different supercapacitor systems, in combination with carbon-based electrodes and BDE(AT)2, BDE(AT)2-0.1EMT, and BDE(AT)2-PA-0.1EMT electrolytes, were constructed. The supercapacitor device in combination with BDE(AT)2-PA-0.1EMT electrolyte, showed the highest ionic conductivity value of 1.2×10-4 S cm-1. The electrode/electrolyte combination demonstrated a maximum specific capacitance (80.4 F g-1), the highest specific energy (2.91 Wh kg-1), and highly effective electrochemical reversibility (up to 2.250 cycles). The supercapacitor device illustrated a better performance at higher temperatures in terms of its specific capacitance value.
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