Malaysian Journal of Analytical Sciences Vol 24 No 2 (2020): 209 - 217

 

 

 

 

CONTROLLED CONCENTRATION OF Mn SALT FOR THE SYNTHESIS OF MANGANESE OXIDE/MESOPOROUS CARBON FILM AS POTENTIAL ELECTRODES FOR SUPERCAPACITOR

 

(Kepekatan Garam Mn Terkawal terhadap Sintesis Mangan Oksida/Karbon Filem Berliang Meso sebagai Elektrod Berpotensi bagi Superkapasitor)

 

Mahanim Sarif @ Mohd Ali^1,3, Zulkarnain Zainal^1,2*, Mohd Zobir Hussein¹, Mohd Haniff Wahid², Noor Nazihah Bahrudin²

 

¹Materials Synthesis and Characterization Laboratory, Institute of Advanced Technology

Department of Chemistry, Faculty of Science

Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia

³Forest Product Division,

Forest Research Institute Malaysia, 52109 Kepong, Selangor, Malaysia

 

*Corresponding author:  zulkar@upm.edu.my

 

 

Received: 15 December 2019; Accepted: 11 March 2020

 

 

Abstract

Manganese oxide (Mn₂O₃) mesoporous carbon (MPC) was synthesized by the incipient wetness of impregnation at room temperature and followed by calcination of 300 °C. The structure and morphology of Mn₂O₃/MPC were characterized by Fourier transform infrared (FTIR) spectrum, atomic force microscopy (AFM) and field emission scanning electron microscopy (FESEM). The electrochemical performance of synthesized composites was evaluated by cyclic voltammetry (CV), galvanostatic measurement of charge-discharge (GCD) as well as power and energy density characteristics. The specific capacitance of the composite electrode when 10 wt.% Mn salt was coated on the surface of MPC film could   reach  53.59 mF cm^-2 as compared to MPC film at only 15.23 mF cm^-2. These are in good agreement with the electrochemical performance improvement results of the energy and power density recorded for Mn₂O₃/MPC, which lead to higher specific capacitance as supported by the CV and GCD results in 1 M potassium chloride (KCl) of electrolyte. This enhanced capacitance was attributed to the outstanding electric properties of MPC film as well as the faradaic redox reactions of manganese oxide as proven by FESEM and EDX analysis. The results indicate the promising application of the fabricated Mn₂O₃/MPC composite as electrodes for supercapacitors.

 

Keywords:  manganese oxide, mesoporous carbon, composite, specific capacitance, supercapacitor

 

Abstrak

Mangan oksida (Mn₂O₃) karbon filem berliang meso (MPC) telah disintesis melalui kaedah serapan basah pada suhu bilik dan diikuti oleh proses pengkalsinan pada suhu 300 °C. Struktur dan morfologi Mn₂O₃/MPC dicirikan oleh spektrum inframerah transformasi Fourier (FTIR), mikroskop kekuatan atom (AFM) dan mikroskop pengimbasan elektron serta pelepasan medan (FESEM). Prestasi elektrokimia komposit yang disintesis telah dinilai oleh kitaran voltammetri (CV), pengukuran pelepasan galvanostatik (GCD) juga ciri-ciri kuasa dan ketumpatan tenaga. Kapasitan khusus elektrod komposit apabila garam 10 wt.% Mn dilapisi pada permukaan MPC filem boleh mencapai 53.59 mF cm^-2 berbanding dengan MPC filem hanya 15.23 mF cm^-2. Ini menyamai dengan peningkatan prestasi elektrokimia terhadap tenaga dan ketumpatan kuasa yang dicatatkan untuk Mn₂O₃/MPC, yang membawa kepada kapasitan khusus yang lebih tinggi, disokong oleh keputusan CV dan GCD dalam elektrolit 1 M kalium klorida (KCl). Peningkatan kapasitan ini adalah disebabkan oleh sifat-sifat elektrik yang cemerlang dari MPC filem serta tindak balas redoks faradaik dari mangan seperti yang dibuktikan juga dalam analisis FESEM dan EDX. Keputusan menunjukkan fabrikasi komposit Mn₂O₃/MPC mempunyai potensi aplikasi sebagai elektrod bagi superkapasitor.

 

Kata kunci:  mangan oksida, karbon berliang meso, komposit, kapasitan khusus, superkapasitor

 

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