Strain-controlled DHP-graphene for ultrahigh-performance hydrogen purification
| Autor: | Wanru Zhai, Maohuai Wang, Xiaoqing Lu, Chi-Man Lawrence Wu, Sainan Zhou |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Strain (chemistry) Graphene Diffusion General Physics and Astronomy 02 engineering and technology Surfaces and Interfaces General Chemistry Permeance 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Hydrogen purifier 0104 chemical sciences Surfaces Coatings and Films law.invention Molecular dynamics Membrane Chemical engineering law Density functional theory 0210 nano-technology |
| Zdroj: | Applied Surface Science. 553:149575 |
| ISSN: | 0169-4332 |
| Popis: | External strain induced membrane separation is an efficient strategy to achieve controllable gas purification. Herein, the potential of a new type of graphene consisting of decagonal, hexagonal, and pentagonal rings (DHPG) was investigated for H2 purification under 0–10% tensile strains by using density functional theory (DFT) and non-equilibrium molecular dynamic (NEMD) simulations. The results showed that, with the increase in strain, the H2 diffusion energy barrier decreased while the diffusion rate and permeance increased. The H2 permeance met the industrial standard when the strain reached 6%, at which the selectivities of H2 over CO2, CO, N2, and CH4 were 3.78 × 1030, 1.46 × 1031, 3.61 × 1032, and 1.91 × 1072, respectively, at 300 K. The NEMD results showed that H2 permeance in DHPG increased with the increase in external pressure applied, while CO2, CO, N2, and CH4 were impeded by the membrane. The results of this work highlighted DHPG as a promising strain-controlled membrane for H2 purification. |
| Databáze: | OpenAIRE |
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