Ultrathin membranes of single-layered MoS₂nanosheets for high-permeance hydrogen separation

Abstract

Single-layered MoS2-based ultrathin membranes with well-controlled thicknesses are prepared by a simple filtration method, and for the first time applied to gas separation. These membranes exhibit superior H2/CO2 separation performance and extremely high H2 permeance. The H2/CO2 separation performance surpasses the state-of-the-art upper-bound of polymeric and inorganic membranes.

2D Nanosheets and Their Composite Membranes for Water, Gas, and Ion Separation

“…Ther esulting membrane demonstrated H 2 permeance of up to 2700 GPU with H 2 /CO 2 selectivity of 291. [55] Freestanding 2D MXene membranes with at hickness of 2 mmp repared by Ding et al presented excellent H 2 permeability and selectivity over other gases (H 2 / CO 2 selectivity of 160) with stable long-term performance over 700 ho fc ontinuous operation. [52] MAMS-1 membranes presented as harp cutoff of the permeance between He and H 2 gases and larger molecular gases.H ue tal.…”

Process simulation and optimization of oxygen enriched combustion using thin polymeric membranes: effect of thickness and temperature dependent physical aging

“…With regards to the effect of film thickness, in contrast to the gas permeability in Figs , that exhibits higher value when specification of active membrane layer is increased attributed to enhanced aging in thin film within the vicinity of closer distance to the free surface for loss of void channels that confines transport pathway, gas permeance is found to be lower at greater thickness. The permeance is related to the path length in which a gas molecules is transported, whereby a thicker film thickness contributes to higher resistance for a gas molecule to pass through the membrane barrier . The superiority of film thickness to improvement of gas permeance is found to be typically apparent within thin membrane thickness since the densification effect is less dominant in comparison to reduction in pathway for transport.…”

“…The total fractional free volume, FFV(t, T), which is constituted by the vacancy diffusion and lattice contraction contribution, has been described using Eqn (10).…”

“…The permeance is related to the path length in which a gas molecules is transported, whereby a thicker film thickness contributes to higher resistance for a gas molecule to pass through the membrane barrier. 10 The superiority of film thickness to improvement of gas permeance is found to be typically apparent within thin membrane thickness since the densification effect is less dominant in comparison to reduction in pathway for transport. The observation is consistent to direction of present research work to fabricate the active film thickness at smaller specification in order to cater for larger feed flux and subsequently promotes economic viability of membranes in industrial application.…”

“…[7][8][9] Thereby, through reduction in the active film thickness, the gas permeance can be increased since the path through which gas molecules permeate has been decreased. 10 Current trend of membrane in industrial application is polymeric layer, which forms the selective barrier to control relative rate of gas transport properties, has been fabricated in the magnitude of ultrathin size upon nanoscale dimension (< 1000 nm) 5,6 in order to induce superior separative performance.…”