High performance MoS2 membranes: effects of thermally driven phase transition on CO2 separation efficiency

Abstract

MoS ₂ membranes show high performance H ₂/CO ₂ separation at high H ₂ permeability. The MoS ₂ membranes were found to be thermally stable up to 160 °C and a significant increase in gas permeability was observed due to the thermally driven phase transition from the 1T to the 2H phase.

Abstract

Submicrometer thick MoS ₂ membranes were investigated for their gas permeation properties and efficiency of H ₂/CO ₂ separation. These membranes show high H ₂/CO ₂ separation at very high H ₂ permeability. The thermal stability of the membrane and the effect of phase transition of MoS ₂ from the 1T to the 2H phase on gas permeability and H ₂/CO ₂ separation were investigated by heating the membrane at different temperatures. The MoS ₂ membranes were found to be thermally stable up to 160 °C and a significant increase in gas permeability was observed. The mechanism of gas permeation through the MoS ₂ membranes was found to be through interbundle spaces instead of interlayer spaces of individual MoS ₂ sheets.