A novel Pt/MoS2/CNT composite catalyst for the positive electrode of a Li-O2 battery

[Display omitted] •A novel Pt/MoS2/CNT catalyst for LOB positive electrode has been synthesised.•Addition of Pt to the catalyst imparts the conductivity and bifunctional properties.•Activity and reversibility in oxygen reaction on Pt/MoS2/CNT is higher than on Pt/CNT. A Pt/MoS2/CNT composite catalyt...

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Bibliographic Details
Published in:Journal of electroanalytical chemistry (Lausanne, Switzerland) Switzerland), 2021-09, Vol.897, p.115554, Article 115554
Main Authors: Tripachev, O.V., Panchenko, N.V., Кorchagin, O.V., Radina, M.V., Dolgopolov, S.V., Grafov, O.Yu, Bogdanovskaya, V.A.
Format: Article
Language:English
Subjects:
Bifunctional catalyst
Carbon nanotubes
Catalysts
Conduction bands
Corrosion resistance
Electrical resistivity
Electron density
Lithium
Lithium batteries
Lithium-oxygen battery
Metal air batteries
Molybdenum disulfide
Non-aqueous electrolyte
Oxygen evolution reaction
Oxygen reduction reaction
Oxygen reduction reactions
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Summary:[Display omitted] •A novel Pt/MoS2/CNT catalyst for LOB positive electrode has been synthesised.•Addition of Pt to the catalyst imparts the conductivity and bifunctional properties.•Activity and reversibility in oxygen reaction on Pt/MoS2/CNT is higher than on Pt/CNT. A Pt/MoS2/CNT composite catalytic system for the positive electrode of a lithium-oxygen battery (LOB) was synthesized by the polyol method. It was established that the modification of MoS2 with platinum leads to an increase in electron density in the conduction band and an increase in electrical conductivity as compared to the characteristics of unmodified MoS2. The introduction of a mesoporous carbon material (carbon nanotubes, CNTs) provides a surface available for lithium peroxide accumulation. In this case, the Pt/MoS2/CNT system exhibits bifunctional catalytic properties, reducing the charge voltage and increasing the discharge capacity of a LOB as compared to the MoS2/CNT catalyst. In addition, the Pt/MoS2/CNT composite demonstrates a higher activity and reversibility in the oxygen reduction reaction than Pt/CNT, probably due to an increased corrosion resistance of MoS2. According to the results of cyclic tests, LOBs with the Pt/MoS2/CNT system can withstand at least 120 consecutive cycles versus 80 cycles for the MoS2/CNT catalyst.
ISSN:1572-6657
1873-2569
DOI:10.1016/j.jelechem.2021.115554