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Dendritic silver self-assembly in molten-carbonate membranes for efficient carbon dioxide capture

McNeil, LA; Mutch, GA; Iacoviello, F; Bailey, JJ; Triantafyllou, G; Neagu, D; Miller, TS; ... Metcalfe, IS; + view all (2020) Dendritic silver self-assembly in molten-carbonate membranes for efficient carbon dioxide capture. Energy & Environmental Science , 13 (6) pp. 1766-1775. 10.1039/c9ee03497h. Green open access

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Abstract

Membranes for CO_{2} capture should offer high permeant fluxes to keep membrane surface area small and material requirements low. Ag-supported, dual-phase, molten-carbonate membranes routinely demonstrate the highest CO_{2} fluxes in this class of membrane. However, using Ag as a support incurs high cost. Here, the non-equilibrium conditions of permeation were exploited to stimulate the self-assembly of a percolating, dendritic network of Ag from the molten carbonate. Multiple membrane support geometries and Ag incorporation methods were employed, demonstrating the generality of the approach, while X-ray micro-computed tomography confirmed that CO_{2} and O_{2} permeation stimulated self-assembly. We report the highest flux of Ag-supported molten-salt membranes to date (1.25 ml min^{−1} cm^{−2} at 650 °C) and ultrahigh permeability (9.4 × 10^{−11} mol m^{−1} s−1 Pa^{−1}), surpassing the permeability requirement for economically-competitive post-combustion CO_{2} capture, all whilst reducing the membrane-volume-normalised demand for Ag by one order of magnitude.

Type: Article
Title: Dendritic silver self-assembly in molten-carbonate membranes for efficient carbon dioxide capture
Open access status: An open access version is available from UCL Discovery
DOI: 10.1039/c9ee03497h
Publisher version: https://doi.org/10.1039/C9EE03497H
Language: English
Additional information: © The Royal Society of Chemistry 2020. This article is licensed under a Creative Commons Attribution 3.0 Unported Licence (http://creativecommons.org/licenses/by/3.0/).
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Chemical Engineering
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
URI: https://discovery.ucl.ac.uk/id/eprint/10096587
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