Binder free 2D aligned efficient MnO2 micro flowers as stable electrodes for symmetric supercapacitor applications

Anil A. Kashale, Madagonda M. Vadiyar, Sanjay S. Kolekar, Bhaskar R. Sathe, Jia Yaw Chang, Hom N. Dhakal, Anil V. Ghule

Research output: Contribution to journalArticlepeer-review

27 Scopus citations

Abstract

Herein, δ-MnO2 micro-flower thin films are grown directly onto a stainless steel mesh via a simple rotational chemical bath deposition technique. Moreover, the influence of the concentration of precursor ratio of MnSO4:KMnO4 is investigated and the obtained samples are designated as M1 (KMnO4:MnSO4 = 3:1), M2 (KMnO4:MnSO4 = 3:2) and M3 (KMnO4:MnSO4 = 3:3). The concentration of MnSO4 as a starting material has a significant influence on the reaction kinetics, which subsequently alters the morphology and also the electrochemical performance. Among these three electrodes, the M1 electrode exhibits a high specific capacitance of 376 F g-1 at a current density of 5 mA cm-2 and a high specific energy of 52 W h kg-1, which is higher than M2 (specific capacitance 312 F g-1 and specific energy 43 W h kg-1) and M3 (specific capacitance 283 F g-1 and specific energy 39 W h kg-1) electrodes. Due to the interesting performance of the M1 based electrode, the symmetric device is fabricated using two electrodes M1 (3:1) and represented as SSM/M1//M1/SSM. The device provides a maximum specific capacitance of 87 F g-1 and specific energy density of 32 W h kg-1 at a current density of 5 mA cm-2. In addition, the symmetric device of the M1 electrode also exhibits good cycle stability showing 138% capacitance retention up to 2500 cycles. The enhanced electrochemical performance could be attributed to the direct growth of micro-flowers of MnO2 on a stainless steel mesh, which provides more pathways for easy diffusion of electrolyte ions into the electrode. This study provides new insight and pathways for the development of low-cost and high-performance energy storage devices.

Original languageEnglish
Pages (from-to)36886-36894
Number of pages9
JournalRSC Advances
Volume7
Issue number59
DOIs
StatePublished - 2017

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