Efficient electrochemical synthesis of a manganese-based metal-organic framework for H2 and CO2 uptake

Asghar, Aisha, Iqbal, Naseem, Noor, Tayyaba, Kariuki, Benson ORCID: https://orcid.org/0000-0002-8658-3897, Kidwell, Luke and Easun, Timothy ORCID: https://orcid.org/0000-0002-0713-2642 2021. Efficient electrochemical synthesis of a manganese-based metal-organic framework for H2 and CO2 uptake. Green Chemistry 23 , pp. 1220-1227. 10.1039/D0GC03292A

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Abstract

n this study Mn-DABDC (DABDC = diaminobenzenedicarboxylate, or 2,5-diaminoterephthalate) MOF was synthesized via an electrochemical method, and a Mn-BDC (BDC = benzenedicarboxylate) MOF was also prepared by a conventional solvothermal method for gas uptake capacity comparison. Investigation of the synthesis parameters demonstrated that current density, electrolyte amount and reaction time were the most significant factors affecting crystal synthesis and product yield. The best conditions found for obtaining crystalline MOF with high yield (93%) were 70 mA current, electrolyte 2.7 mmol / 30 ml DMF and 2 hrs of reaction time. These optimized electrochemical conditions allow for a relatively fast MOF synthesis, important for reducing synthesis cost compared with conventional hydrothermal and solvothermal methods. The Mn-DABDC MOF sample was fully characterized to analyse its structure, thermal stability and surface area. The electrochemically synthesized MOF has high carbon dioxide uptake (92.4 wt% at 15 bar and 273 K) and hydrogen uptake (12.3 wt% at 80 bar pressure and 77 K). This is the first amine-based manganese MOF synthesized electrochemically, and the method has excellent potential for reducing large-scale MOF production costs.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Chemistry
Additional Information:	This article is licensed under a Creative Commons Attribution 3.0 Unported Licence
Publisher:	Royal Society of Chemistry
ISSN:	1463-9262
Funders:	Royal Society
Date of First Compliant Deposit:	19 January 2021
Date of Acceptance:	15 January 2021
Last Modified:	05 May 2023 23:09
URI:	https://orca.cardiff.ac.uk/id/eprint/137794

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