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J. Korean Ceram. Soc. > Volume 57(5); 2020 > Article
Journal of the Korean Ceramic Society 2020;57(5): 585-596.
doi: https://doi.org/10.1007/s43207-020-00057-6
Surface modification and electrochemical performance of KMnO4‑ultra‑surface area activated carbon (USAC) composites as cathode material
Zambaga Otgonbayar1, K amrun Nahar Fatema1, Md Nazmodduha Rafat1, Jihyeon Ryu4, Sun‑Hye Yang2, Ick‑Jun Kim2, Won‑Chun Oh1,3
1Department of Advanced Materials Science and Engineering, Hanseo University, Seosan‑si 356‑706, Chungnam, Korea
2Korea Electrotechnology Research Institute, Changwon‑si 641‑120, Kyungnam, Korea
3College of Materials Science and Engineering, Anhui University of Science and Technology, Huainan 232001, People’s Republic of China
4Department of Electro‑Functionality Materials Engineering, University of Science and Technology (UST), Daejeon 34113, Republic of Korea
Correspondence  Won‑Chun Oh ,Email: wc_oh@hanseo.ac.kr
Received: March 14, 2020; Revised: April 30, 2020   Accepted: May 6, 2020.  Published online: September 30, 2020.
ABSTRACT
The goal of this study was to analyse the impact of a combination of a sub-active material (KMnO4) with surface modification to the activated carbon surface for enhanced cathode performance. Activated carbon with ultra-specific surface area (USAC, TCK-PBM, 2560.4 m2/g) was used for the preparation of our composite with potassium permanganate (KMnO4). The physical characteristics of this As-treated USAC sample were analysed through XRD, SEM and EDX analysis. The XRD analysis was used to examine structural properties; surface analysis undertaken by SEM; EDX analysis was used to measure the metal content of the sample as well as the content after treatment with KMnO4. It was shown USAC treated with KMnO4 had more than a 10.5 μg acidic group by the Boehm titration method. The electrochemical properties of KMnO4-USAC were investigated for varying electrolyte concentration (0.1, 0.5, 1.2 and 6 M) at ambient temperature (25 °C) and the electrode showed great electrochemical performance after ten cycles.
Key words: Ultra-surface area activated carbon (USAC) · Sub-active material · Secondary battery electrode ·Electrochemical performance
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