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. 2021 Feb 24;7(9):eabf0116. doi: 10.1126/sciadv.abf0116

Fig. 3. Gas separation performance from the vacancy defects in N-SLG incorporated by the millisecond gasification.

Fig. 3

Evolution of the gas permeance (A) and extracted activation energies of H2, CO2, and CH4 for transport across N-SLG (B) as a function of the O3 dosage. (C) CO2/CH4 selectivity and CO2 permeance from N-SLG etched at 250°C (τ = 0.1 s) with varying td. (D) Comparison of the gas separation performance of N-SLG etched at 250° and 290°C and (E) the corresponding van der Waals gap extracted from HRTEM after heating the samples to 900°C (unfunctionalized pores). td was 0.5 s for the 250° and 290°C cases (using Ar purge) and 0.2 s for the optimized 290°C case (using the He purge). (F) Photograph of the centimeter-scale N-SLG membrane on the smoothened metal-mesh support. Red lines highlight the edges of the membrane. Photo credit: Shiqi Huang, École Polytechnique Fédérale de Lausanne.