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Understanding the electrocatalysis OER and ORR activity of ultrathin spinel Mn3O4
Chinmayee Chowde Gowda,Ankita Mathur,Arko Parui,Partha Kumbhakar,Prafull Pandey,Sudhanshu Sharma,Amreesh Chandra,Abhishek K. Singh,Aditi Halder,Chandra Sekhar Tiwary 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.113 No.-
Rapid depletion of non-renewable sources has made us look into possible green energy alternatives tomeet energy challenges. Electrocatalytic reactions involving oxygen evolution reaction (OER) and oxygenreduction reaction (ORR) play crucial roles in assisting the derivation of clean forms of energy. Here, wedemonstrate that few layers of the manganese oxide: hausmannitene (atomically thin two dimensional(2D-Mn3O4) can be exfoliated from its bulk form hausmannite (Mn3O4). Most significantly, the hausmanniteneexhibits catalytic activity towards oxygen reduction and evolution reactions. The hausmannitenehas enhanced Mn(III) ions (65%) compared to its parent structure hausmannite (31%). The Mn(III) ionsin a distorted lattice show the highest catalytic activity towards OER performance with the oxygen electrodeactivity (DE) of 1.08 eV for hausmannitene. The density functional theory (DFT) calculations, confirmedthe presence of both Mn(III) and Mn(II) sites on the (112)-oriented surface of Mn3O4 which arehighly active for OER and ORR, having vacant and filled orbitals of lowest and highest energy, respectively. Increased oxidation sites aiding to better performance of 2D structure was theoretically manifested. Therefore, demonstrating that similar mechanisms can be used to explore other 2D oxides aspossible efficient stable electrocatalyst substitute for energy conversion.
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