Accumulation charge mechanisms in electrochemical systems formed based on activated carbon and manganese oxide

• Main Authors: B. K. Ostafiychuk, M. I. Kolkovskyi, B. I. Rachiy, P. I. Kolkovskyi, N. Ya. Ivanichok, R. V. Ilnitsky
• Format: Article
• Language: English
• Published: Vasyl Stefanyk Precarpathian National University 2020-03-01
• Series: Фізика і хімія твердого тіла
• Subjects: hybrid electrochemical supercapacitors; porous carbon material; manganese oxide
• Online Access: https://journals.pnu.edu.ua/index.php/pcss/article/view/3360
• ISSN: 1729-4428; 2309-8589

In this work, the porous structure of the carbon material and the crystalline structure of manganese oxide α - modification (α - MnO2) have been investigated. The electrochemical performance of symmetric and asymmetric supercapacitors (α - MnO2 / Activated carbon) was investigated by cyclic voltammetry and galvanostatic cycling methods. The processes occur mainly at the electrode – electrolyte interface have been analyzed. It was determined that at discharge currents of 0.5 - 5 mA, the specific capacitance value for the α - MnO2 / Activated carbon hybrid capacitor exceeds the value of the symmetric capacitor by 45 - 55 % under the same conditions.