Understanding the electrocatalysis OER and ORR activity of ultrathin spinel Mn3O4

被引:25
作者
Gowda, Chinmayee Chowde [1 ]
Mathur, Ankita [2 ]
Parui, Arko [3 ]
Kumbhakar, Partha [4 ]
Pandey, Prafull [5 ]
Sharma, Sudhanshu [6 ]
Chandra, Amreesh [7 ]
Singh, Abhishek K. [3 ]
Halder, Aditi [2 ]
Tiwary, Chandra Sekhar [1 ,4 ]
机构
[1] Indian Inst Technol Kharagpur, Sch Nano Sci & Technol, Kharagpur 721302, West Bengal, India
[2] Indian Inst Technol Mandi, Sch Basic Sci, Mandi 175005, Himachal Prades, India
[3] Indian Inst Sci, Mat Res Ctr, Bangalore 560012, Karnataka, India
[4] Indian Inst Technol Kharagpur, Dept Met & Mat Engn, Kharagpur 721302, West Bengal, India
[5] Indian Inst Sci, Dept Mat Engn, Bangalore 560012, Karnataka, India
[6] Indian Inst Technol Gandhinagar, Dept Chem, Gandhinagar 382355, Gujarat, India
[7] Indian Inst Technol Kharagpur, Dept Phys, Kharagpur 721302, West Bengal, India
关键词
2D metal oxides; Hausmannitene; Oxygen evolution reaction; Oxygen reduction reaction; OXYGEN EVOLUTION REACTION; EFFICIENT ELECTROCATALYST; REDUCTION; NANOSHEETS; CATALYSTS; HYDROGEN; OXIDES; MXENE; FILMS;
D O I
10.1016/j.jiec.2022.05.024
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Rapid depletion of non-renewable sources has made us look into possible green energy alternatives to meet energy challenges. Electrocatalytic reactions involving oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) play crucial roles in assisting the derivation of clean forms of energy. Here, we demonstrate 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 hausman-nitene exhibits catalytic activity towards oxygen reduction and evolution reactions. The hausmannitene has enhanced Mn(III) ions (-65%) compared to its parent structure hausmannite (-31%). The Mn(III) ions in a distorted lattice show the highest catalytic activity towards OER performance with the oxygen elec-trode activity (DE) of 1.08 eV for hausmannitene. The density functional theory (DFT) calculations, con-firmed the presence of both Mn(III) and Mn(II) sites on the (112)-oriented surface of Mn3O4 which are highly active for OER and ORR, having vacant and filled orbitals of lowest and highest energy, respec-tively. Increased oxidation sites aiding to better performance of 2D structure was theoretically mani-fested. Therefore, demonstrating that similar mechanisms can be used to explore other 2D oxides as possible efficient stable electrocatalyst substitute for energy conversion.(c) 2022 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
引用
收藏
页码:153 / 160
页数:8
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