New quinone-based electrode additives electrochemically polymerized on activated carbon electrodes for improved pseudocapacitance

• Published in: Macromolecular research Vol. 31; no. 2; pp. 171 - 179
• Main Authors: Lee, Kyuchul, Hwang, Jihyun, Park, Jeong Ho, Park, Jongwook, Lee, Kangwon, Ko, Jang Myoun
• Format: Journal Article
• Language: English
• Published: Seoul The Polymer Society of Korea 01.02.2023; Springer; Springer Nature B.V; 한국고분자학회
• Subjects: Activated carbon; Additives; Capacitance; Capacitors; Characterization and Evaluation of Materials; Chemistry; Chemistry and Materials Science; Complex Fluids and Microfluidics; Electrochemical analysis; Electrodes; Electrons; Nanochemistry; Nanotechnology; Physical Chemistry; Polymer Sciences; Quinone; Quinones; Soft and Granular Matter; Supercapacitors; Synthesis; 고분자공학; Quinone based; Pseudocapacitance; Activated carbon; Redox reaction
• ISSN: 1598-5032; 2092-7673
• DOI: 10.1007/s13233-023-00129-6

Three quinone-based derivatives (HBU680, HBU888, and HBU889) are synthesized and separately mixed with activated carbon (AC) and electropolymerized to form a homogeneous composite electrode. The electrochemical properties of the composite electrodes are studied. The electrochemical properties are mainly characterized by PhQ-PhQH2 and Q-QH2 redox transitions. The composite electrodes show specific capacitance of 176 F/g, 262 F/g, and 145 F/g for HBU680, HBU888, and HBU889, respectively. The HBU888 shows the highest specific capacitance due to the fast PhQ-PhQH2 redox transition at a scan rate of 100 mV/s. The composite electrodes also show a 100% capacity retention over 10,000 cycles. These results show that the new quinone-based derivates can enhance pseudocapacitive behavior and warrant their use as electrode additives for supercapacitors. Graphical abstract The new quinone-based electrode additives were synthesized and used as additives for supercapacitor electrodes. The electrochemical properties are mainly characterized by PhQ-PhQH2 and Q-QH2 redox transitions. The composite electrodes show specific capacitance of 176 F/g, 262 F/g, and 145 F/g for HBU680, HBU888, and HBU889 respectively. The HBU888 shows the highest specific capacitance due to the fast PhQ-PhQH2 redox. The composite electrodes also show a 100% capacity retention over 5000 cycles.