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High-permeance polymer-functionalized single-layer graphene membranes that surpass the postcombustion carbon capture target

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Abstract

Membrane-based postcombustion carbon capture can reduce the capture penalty in comparison to absorbent-based separation. To realize this, high-performance membranes are urgently needed with a CO2 permeance exceeding 1000 gas permeation units or GPU, and a CO2/N2 mixture separation factor exceeding 20. Here, we report a new class of organic–inorganic hybrid membranes based on single-layer graphene with a selective layer thinner than 20 nm. For this, the impermeable graphene lattice is exposed to oxygen plasma leading to a high percentage of vacancy defects (porosity up to 18.5%) and is then functionalized with CO2-philic polymeric chains. Treating a gas stream mimicking flue gas, the hybrid membranes yield a six-fold higher CO2 permeance (6180 GPU with a CO2/N2 separation factor of 22.5) than the performance target. Membranes prepared with a combination of optimized graphene porosity, pore size, and functional groups yield a CO2 permeance up to 11 790 GPU. Other membranes yield a CO2/N2 selectivity up to 57.2.

Graphical abstract: High-permeance polymer-functionalized single-layer graphene membranes that surpass the postcombustion carbon capture target

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Publication details

The article was received on 18 Apr 2019, accepted on 15 Jul 2019 and first published on 26 Jul 2019


Article type: Communication
DOI: 10.1039/C9EE01238A
Energy Environ. Sci., 2019, Advance Article
  • Open access: Creative Commons BY-NC license
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    High-permeance polymer-functionalized single-layer graphene membranes that surpass the postcombustion carbon capture target

    G. He, S. Huang, L. F. Villalobos, J. Zhao, M. Mensi, E. Oveisi, M. Rezaei and K. V. Agrawal, Energy Environ. Sci., 2019, Advance Article , DOI: 10.1039/C9EE01238A

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