Facile sono-chemical synthesis of nanocrystalline MnO2 for catalytic and capacitive applications

Kajal Rajrana; Aayush Gupta; Rameez Ahmad Mir; O. P. Pandey

doi:10.1016/j.physb.2019.04.002

Facile sono-chemical synthesis of nanocrystalline MnO₂ for catalytic and capacitive applications

Kajal Rajrana, Aayush Gupta, Rameez Ahmad Mir, O. P. Pandey

Research output: Contribution to journal › Article › peer-review

25 Scopus citations

Abstract

In this reported work, the potential application of MnO₂ nanopowder for photocatalytic and the electrocatalytic applications is explored. The MnO₂ nanopowder has been synthesized through sonochemical route using KMnO₄ and poly-ethylene glycol as the reducing agent. Structural and optical analysis (XRD, TEM, FTIR, XPS and UV–visible) confirmed the formation of nanocrystalline MnO₂ network. The adsorption and photocatalytic performance of synthesized MnO₂ was tested for degradation of methylene blue dye and p-nitrophenol (2 mg/L) under dark chamber and household CFL lamp exposure, respectively. The electrochemical studies in alkaline (0.5 M KOH) medium shows the electric double layer capacitance of 7.4 mFcm⁻² suggesting its potential application for energy storage devices. The synthesized compound exhibited excellent stability after 1000 CV cycles (∼4% current loss) where Volmer reaction was observed as the rate determining step for the electrocatalytic hydrogen evolution reaction.

Original language	English
Pages (from-to)	179-185
Number of pages	7
Journal	Physica B: Condensed Matter
Volume	564
DOIs	https://doi.org/10.1016/j.physb.2019.04.002
State	Published - 1 Jul 2019
Externally published	Yes

Keywords

Adsorption
EDLC
HER
MnO
Photodegradation

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10.1016/j.physb.2019.04.002

Cite this

@article{413bd51904b4471b94162457fe0bc010,

title = "Facile sono-chemical synthesis of nanocrystalline MnO2 for catalytic and capacitive applications",

abstract = "In this reported work, the potential application of MnO2 nanopowder for photocatalytic and the electrocatalytic applications is explored. The MnO2 nanopowder has been synthesized through sonochemical route using KMnO4 and poly-ethylene glycol as the reducing agent. Structural and optical analysis (XRD, TEM, FTIR, XPS and UV–visible) confirmed the formation of nanocrystalline MnO2 network. The adsorption and photocatalytic performance of synthesized MnO2 was tested for degradation of methylene blue dye and p-nitrophenol (2 mg/L) under dark chamber and household CFL lamp exposure, respectively. The electrochemical studies in alkaline (0.5 M KOH) medium shows the electric double layer capacitance of 7.4 mFcm−2 suggesting its potential application for energy storage devices. The synthesized compound exhibited excellent stability after 1000 CV cycles (∼4% current loss) where Volmer reaction was observed as the rate determining step for the electrocatalytic hydrogen evolution reaction.",

keywords = "Adsorption, EDLC, HER, MnO, Photodegradation",

author = "Kajal Rajrana and Aayush Gupta and Mir, {Rameez Ahmad} and Pandey, {O. P.}",

note = "Publisher Copyright: {\textcopyright} 2019 Elsevier B.V.",

year = "2019",

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doi = "10.1016/j.physb.2019.04.002",

language = "English",

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T1 - Facile sono-chemical synthesis of nanocrystalline MnO2 for catalytic and capacitive applications

AU - Rajrana, Kajal

AU - Gupta, Aayush

AU - Mir, Rameez Ahmad

AU - Pandey, O. P.

PY - 2019/7/1

Y1 - 2019/7/1

N2 - In this reported work, the potential application of MnO2 nanopowder for photocatalytic and the electrocatalytic applications is explored. The MnO2 nanopowder has been synthesized through sonochemical route using KMnO4 and poly-ethylene glycol as the reducing agent. Structural and optical analysis (XRD, TEM, FTIR, XPS and UV–visible) confirmed the formation of nanocrystalline MnO2 network. The adsorption and photocatalytic performance of synthesized MnO2 was tested for degradation of methylene blue dye and p-nitrophenol (2 mg/L) under dark chamber and household CFL lamp exposure, respectively. The electrochemical studies in alkaline (0.5 M KOH) medium shows the electric double layer capacitance of 7.4 mFcm−2 suggesting its potential application for energy storage devices. The synthesized compound exhibited excellent stability after 1000 CV cycles (∼4% current loss) where Volmer reaction was observed as the rate determining step for the electrocatalytic hydrogen evolution reaction.

AB - In this reported work, the potential application of MnO2 nanopowder for photocatalytic and the electrocatalytic applications is explored. The MnO2 nanopowder has been synthesized through sonochemical route using KMnO4 and poly-ethylene glycol as the reducing agent. Structural and optical analysis (XRD, TEM, FTIR, XPS and UV–visible) confirmed the formation of nanocrystalline MnO2 network. The adsorption and photocatalytic performance of synthesized MnO2 was tested for degradation of methylene blue dye and p-nitrophenol (2 mg/L) under dark chamber and household CFL lamp exposure, respectively. The electrochemical studies in alkaline (0.5 M KOH) medium shows the electric double layer capacitance of 7.4 mFcm−2 suggesting its potential application for energy storage devices. The synthesized compound exhibited excellent stability after 1000 CV cycles (∼4% current loss) where Volmer reaction was observed as the rate determining step for the electrocatalytic hydrogen evolution reaction.

KW - Adsorption

KW - EDLC

KW - HER

KW - MnO

KW - Photodegradation

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