Controlling the Molar Ratios of Cation to Anion of Precursors for High Performance Capacitive Properties of MnO2 Hybridized Carbon-Based Materials Electrode

Controlling the cation to anion (Mn2+/MnO4−) molar ratios of the precursors was used to obtain a highly performance capacitive properties of nanostructural MnO2 hybridized carbon-based materials on nickel foam (NF) through successive ionic layer adsorption and reaction technology. SEM, XRD, BET, and...

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Bibliographic Details
Published inBatteries (Basel) Vol. 9; no. 5; p. 273
Main Authors Yang, Wein-Duo, Chou, Yi-Rong, Kuo, Cheng-Ching, Kang, Yu-Min
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 16.05.2023
Subjects
Anions
Aqueous electrolytes
Capacitance
Carbon
Cations
Electrode materials
Electrodes
Electrolytes
Energy storage
Graphene
Ions
Manganese dioxide
Metal foams
Methods
Morphology
Multi wall carbon nanotubes
Nanocomposites
Pore size distribution
Precursors
Ratios
reduced graphene oxide
Spectrum analysis
Stainless steel
successive ionic layer adsorption & reaction
X ray photoelectron spectroscopy
Japan
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Summary:Controlling the cation to anion (Mn2+/MnO4−) molar ratios of the precursors was used to obtain a highly performance capacitive properties of nanostructural MnO2 hybridized carbon-based materials on nickel foam (NF) through successive ionic layer adsorption and reaction technology. SEM, XRD, BET, and XPS analyses are utilized to investigate the influence of cation/anion molar ratios of precursors on the as-obtained MnO2 electrode materials. At a lower molar ratio of cation/anion of 1, the prepared manganese oxide deposited on the NF with obvious δ-MnO2 phase. The average pore size distribution of BET analysis of the as-obtained δ-MnO2 is about 4.6 nm, the specific surface area is 155.7 m2 g−1, exhibiting a mesoporous structure. However, when the molar ratio of cation/anion is higher than 5, the deposited film produced by the reaction exhibits a γ-MnO2 crystal phase. The capacitance of δ-MnO2/NF electrode is 280 F g−1 at 1 A g−1 in a 1 M Na2SO4 aqueous electrolyte solution. In addition, reduced graphene oxide (rGO) mixed with multi-wall carbon nanotube (MWCNT) was added to synthesize γ-MnO2/rGO-MWCNT/NF electrode, which has a high capacitance of 377.4 F g−1 under the charge/discharge current density at 1 A g−1.
ISSN:2313-0105
2313-0105
DOI:10.3390/batteries9050273