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Mesoporous MnCo2S4 nanosheet arrays as an efficient catalyst for Li–O2 batteries

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Abstract

Ternary metal sulfides and ternary metal oxides have received much attention as potential electrodes for high performance rechargeable batteries. Herein, MnCo2S4 nanosheets are grown on carbon paper (MCS/CP) via facile electrodeposition followed by low temperature vulcanization for application in Li–O2 batteries for the first time. The electrochemical performance of freestanding, binder-free MCS/CP oxygen electrodes is compared with those prepared from MnCo2O4 nanosheets on CP (MCO/CP). The MCS/CP electrode delivers an extremely high initial specific capacity of 10 760 mA h g−1, twice that of MCO/CP. The former electrode sustains 96 cycles at an upper limit capacity of 500 mA h g−1 at 200 mA g−1, whereas the latter counterpart survives only a few cycles with a poor round trip efficiency. The superior performance of MCS/CP is in part proven by the four times higher electrical conductivity and 250% higher lithium diffusion coefficient than MCO/CP. In addition, the 3D interconnected web of 2D MCS nanosheets offers a few micrometer open voids to accommodate discharge products and a large surface area with internal mesopores providing abundant active sites. The density functional theory calculations reveal a lower adsorption energy for LiO2 on the surface of MCS than on MCO, which is responsible for the lower OER overpotential and the higher catalytic ability of MCS/CP. The predicted density of states signifies metallic properties of MCS in agreement with the high electrical conductivity of MCS/CP.

Graphical abstract: Mesoporous MnCo2S4 nanosheet arrays as an efficient catalyst for Li–O2 batteries

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Publication details

The article was received on 16 May 2018, accepted on 02 Aug 2018 and first published on 03 Aug 2018


Article type: Paper
DOI: 10.1039/C8NR03942A
Citation: Nanoscale, 2018, Advance Article
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    Mesoporous MnCo2S4 nanosheet arrays as an efficient catalyst for Li–O2 batteries

    Z. Sadighi, J. Liu, F. Ciucci and J. Kim, Nanoscale, 2018, Advance Article , DOI: 10.1039/C8NR03942A

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