Alcohol mediated growth of α-MnO₂thin films from KMnO₄precursor for high performance supercapacitors

Abstract

AbstractsThe energy storage devices, with low cost, high energy density, high power density and long cycle life, have prime importance in order to solve the problem of interrupted power supply of the renewable generation systems. In present work, MnO 2 thin films have been deposited by simple, scalable, additive-free, binder-less, low cost, low temperature and eco-friendly chemical bath deposition method. The impact of three different alcohols (methanol, ethanol, 2-propenol), as a reducing agent, on the morphological, structural and electrochemical properties of MnO 2 thin film is investigated. The MnO 2 thin film prepared with the methanol as a reducing agent exhibits high specific surface area with excellent electrochemical features such as, high specific capacitance of 633 F g -1 and high energy density of 65.9 W h kg -1 at current density of 1 mA cm -2 along with a good cycling stability of 95% after 2000 of CV cycles. Such beating electrochemical properties suggest that MnO 2 thin film prepared with the methanol as a reducing agent using chemical bath deposition is a significant method to prepare reliable electrode material for future energy storage devices.

Fabrication and lithium storage properties of MnO2 hierarchical hollow cubes

“…However, when the reaction temperature achieved the desired one (150 C) in the hydrothermal reaction, KMnO 4 gradually decomposed to MnO 2 . MnO 2 has been reported to be easily produced in a hydrothermal reaction of KMnO 4 solution [19,31,32].…”

Direct growth of FeCo2O4 nanowire arrays on flexible stainless steel mesh for high-performance asymmetric supercapacitor

“…Furthermore, the sample prepared at a lower temperature (FCO80) shows a smaller surface area than the FCO100 sample that is attributed to the larger nanoparticles (400-600 nm), and it is already well known that large nanoparticles have a lower specific surface area. 30 The structural study of the prepared FeCo 2 O 4 thin film was performed using X-ray diffraction, X-ray photoelectron spectroscopy and high-resolution transmission electron microscopy (HRTEM) measurements. All the X-ray diffraction peaks agree well with a cubic structure (JCPDS-98-009-8552) with the Fd3m space group (SI S4) and those are conveyed as (M)[M′ 2 ]O 4 , where M and M′ are the two metal cations that are arranged at the tetrahedral or octahedral site.…”

Nano “Koosh Balls” of Mesoporous MnO2: Improved Supercapacitor Performance through Superior Ion Transport

“…To this end, hydrothermal( HT) syntheses of MnO 2 nanomaterials of differentm orphologies have been reported, employing av arietyo fo xidizable sourcess uch as carbon, [23,24] copper, [25] iron, [26] ethanol, [27] ethylene glycol, [28] or polyethylene glycol. [29] Zhu et al employedt he oxidation of rigids acrificial templates such as carbon nanofibers and onion-like carbon by KMnO 4 for the preparation of tubularn anostructureso fM nO 2 , whereasW ang et al fabricated hybrid MnO 2 nanourchinsf or Li-ion battery applications.…”