Rational design and microwave-assisted synthesis of a novel terthiophene derivative for facile preparation of binder-free polymer/metal oxide-based binary composite electrodes with high electrochemical performance

• Published in: New journal of chemistry Vol. 46; no. 13; pp. 6134 - 6149
• Main Authors: Yi it, Deniz, Güllü, Mustafa
• Format: Journal Article
• Language: English
• Published: CAMBRIDGE Royal Soc Chemistry 28.03.2022; Royal Society of Chemistry
• Subjects: Charge density; Chemistry; Chemistry, Multidisciplinary; Composite materials; Conducting polymers; Current density; Discharge; Electrochemical analysis; Electrochemical impedance spectroscopy; Electrode materials; Electrodes; Metal oxides; Physical Sciences; Polymer films; Polymers; Science & Technology; Stainless steels; Substrates; Supercapacitors; Titanium dioxide; Vanadium pentoxide; SUPERCAPACITOR ELECTRODES; POLYPYRROLE; V2O5; POLYTHIOPHENE; ACTIVE MATERIALS; NANOSTRUCTURES; REDOX SUPERCAPACITORS; NANOWIRES; CONDUCTING POLYMERS; TIO2
• ISSN: 1144-0546; 1369-9261
• DOI: 10.1039/d2nj00357k

In this study, a simple and effective method was presented for the preparation of binder-free conducting polymer/metal oxide binary composite electrode materials. The novel electropolymerizable thiophene monomer, 3-[(2,2′:5′,2′′-terthiophen-3′-yl)]-2-cyanoacrylic acid) (SDOGA), was specifically designed to fabricate homogeneous and chemically stable redox-active composite electrodes for pseudocapacitor applications. Poly(3-[(2,2′:5′,2′′-terthiophen-3′-yl)]-2-cyanoacrylic acid) (PSDOGA) was electrochemically deposited on stainless steel substrates and modified with TiO 2 and V 2 O 5 particles via a simple, efficient and low-cost process without any polymeric binder. Cyclic voltammetry (CV), galvanostatic charge/discharge (GCD) and electrochemical impedance spectroscopy (EIS) techniques were used to study the pseudocapacitive properties of PSDOGA/TiO 2 and PSDOGA/V 2 O 5 binder-free binary composites in both three-electrode and two-electrode cell configurations. PSDOGA/TiO 2 and PSDOGA/V 2 O 5 composites delivered high specific capacitances of 396.4 Fg −1 and 444.5 Fg −1 , respectively, at 2.5 mA cm −2 current density in single electrode measurements. Symmetrical supercapacitor devices assembled by using PSDOGA/TiO 2 and PSDOGA/V 2 O 5 binder-free binary composite electrodes exhibited satisfactory energy (78 W h kg −1 and 94.8 W h kg −1 ) and power (700 W kg −1 and 736 W kg −1 ) densities with good charge/discharge characteristics at a large operating voltage of 1.85 V. Furthermore, symmetric type supercapacitor cells achieved an excellent capacitance retention of 87% and 90% for 12 500 consecutive galvanic charge/discharge cycles at a constant current density of 2.5 mA cm −2 . The experimental results revealed that the cooperation between conducting polymer film and metal oxide particles not only greatly enhanced the capacitive performances, but also improved the long-term charge/discharge stability of the redox-active electrode materials. A simple and effective approach was reported for the preparation of binder-free conducting polymer/metal oxide binary composite electrode materials.