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AuthorAshok, Anchu
AuthorKumar, Anand
AuthorPonraj, Janarthanan
AuthorMansour, Said A.
Available date2022-09-15T07:07:59Z
Publication Date2020
Publication NameJournal of the Electrochemical Society
ResourceScopus
URIhttp://dx.doi.org/10.1149/1945-7111/ab679d
URIhttp://hdl.handle.net/10576/34060
AbstractWe report the synthesis of mesoporous/microporous MnCo2O4 and cubic MnCr2O4 using solution combustion synthesis for oxygen reduction and oxygen evolution reactions. XRD and TEM analysis indicate small crystallites of MnCo2O4 forming ultra-thin layer of irregular structures that lead to porous morphology. A slightly larger crystallite size was observed for MnCr2O4. The surface oxygen defect in MnCo2O4 is much higher than MnCr2O4 that enhances the active sites for the oxygen adsorption and promotes fast dissociation in presence of more exposed Mn/Co sites during the oxygen electrocatalysis. The electrochemical properties of the synthesized catalysts were analysed using CV, LSV, EIS and CA showing high limiting current density and kinetic current density, positive onset and halfwave potential and higher number of overall electron transfer in MnCo2O4 that MnCr2O4. Chronoamperometric (CA) runs for 24 h shows excellent stability of MnCo2O4 without any significant decrease in the current or potential value in ORR and OER. On basis of the activity and stability performance, MnCo2O4 shows to be a promising bifunctional electrocatalyst, with significantly improved performance than previously reported Mn and Co mixed oxides, and comparable to Pt and Ru based catalysts in terms of durability, onset potential and Tafel slope.
Languageen
PublisherInstitute of Physics Publishing
SubjectMesoporous
Microporous MnCo2O4
Nanocubic MnCr2O4
Combustion Synthesis
Oxygen Electrocatalysis
TitlePreparation of Mesoporous/Microporous MnCo2O4 and Nanocubic MnCr2O4 Using a Single Step Solution Combustion Synthesis for Bifunction Oxygen Electrocatalysis
TypeArticle
Issue Number5
Volume Number167
dc.accessType Open Access


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