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Morphological effect of MoS2 nanoparticles on catalytic oxidation and vacuum lubrication |
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| Authors: | Kun Hong Hu Xian Guo Hu |
| Institution: | a Institute of Tribology, Hefei University of Technology, Hefei 230009, China b Department of Chemical and Materials Engineering, Hefei University, Hefei 230022, China c State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China |
| Abstract: | The closed layered MoS2 nano-balls and the opened layered MoS2 nano-slices were prepared by decomposing MoS3 in hydrogen atmosphere. The obtained MoS2 nanoparticles were respectively used as catalysts for S2− oxidation into SO42− and lubricating fillers in polyoxymethylene (POM) plastic. Only basal surface could be found in the closed layered MoS2 nano-balls, which represented very low catalytic efficiency for S2− oxidation into SO42−. However, the opened layered MoS2 nano-slices were of both basal surface and rim-edge surface and showed excellent catalytic properties. Moreover, it was shown that MoS2 nano-balls could improve the self-lubrication of POM plastic in vacuum. However, MoS2 nano-slices led to the obvious degradation of POM, implying it is not a proper additive for POM. The high activity of MoS2 nano-slices for catalyzing S2−oxidation and degrading POM was ascribed to their small sizes and partly wedge-like shapes, which led to a considerable increase in the rim sites. The weak catalysis and excellent lubrication of MoS2 nano-balls were resulted from its closed structure and chemical inertness. |
| Keywords: | MoS2 nanoparticles Catalytic properties Tribological properties Morphological effect |
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