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Issue 7, 2020
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Anion-exchange phase control of manganese sulfide for oxygen evolution reaction

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Abstract

Manganese sulfide usually exists as MnS2 (cubic), β-MnS (zinc blende), γ-MnS (wurtzite), and α-MnS (rock salt) polymorphs. In this study, polymorphic thin films of MnS2, γ-MnS, and α-MnS were prepared from manganese carbonate through anion exchange and controlled reaction kinetics via a hydrothermal method. At the same mass ratio (1 : 1) of manganese carbonate to the S precursor, the hydrothermal anion-exchange kinetics were used to determine the phases (MnS2, γ-MnS, and α-MnS) of manganese sulfide. The α-MnS phase was obtained at a high S precursor content, specifically at a mass ratio of 1 : 5, even at 363 K. The different prepared phases (MnS2, γ-MnS, and α-MnS) exhibited superior O2 evolution reaction activities (overpotential: 301, 342, and 292 mV, respectively) compared with pristine manganese carbonate (overpotential: 480 mV) in a 1 M KOH electrolyte to drive a current density of 10 mA cm−2. Among all the polymorphs, α-MnS exhibited the lowest overpotential because it had the lowest charge-transfer resistance (8.9 Ω cm−2), edge sharing MnS6 octahedra with more active sites and highest electrochemical active surface area (360 cm−2). This study provides a new approach to control the phase of transition-metal chalcogenides for improved electrochemical reactions.

Graphical abstract: Anion-exchange phase control of manganese sulfide for oxygen evolution reaction

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Supplementary files

Article information


Submitted
24 Sep 2019
Accepted
19 Jan 2020
First published
22 Jan 2020

J. Mater. Chem. A, 2020,8, 3901-3909
Article type
Paper

Anion-exchange phase control of manganese sulfide for oxygen evolution reaction

R. B. Pujari, G. S. Gund, S. J. Patil, H. S. Park and D. Lee, J. Mater. Chem. A, 2020, 8, 3901
DOI: 10.1039/C9TA10553K

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