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      Bifunctional PGM-free metal organic framework-based electrocatalysts for alkaline electrolyzers: trends in the activity with different metal centers

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          Abstract

          Several composites of metal organic frameworks with electrocatalytic activity toward OER and HER were studied. A trend of the activity among the different metals was observed for both reactions and was confirmed by DFT calculations.

          Abstract

          In order to solely rely on renewable and efficient energy sources, reliable energy storage and production systems are required. Hydrogen is considered an ideal solution as it can be produced electrochemically by water electrolysis and renewably while no pollutants are released when consumed. The most common catalysts in electrolyzers are composed of rare and expensive precious group metals. Replacing these materials with Earth-abundant materials is important to make these devices economically viable. Metal organic frameworks are one possible solution. Herein we demonstrate the synthesis and characterization studies of metal benzene-tri-carboxylic acid-based metal–organic frameworks embedded in activated carbon. The conductive composite material was found to be electrocatalytically active for both the oxygen evolution reaction and the hydrogen evolution reaction. Furthermore, several metal organic frameworks sharing the same ligand but with different first-row transition metals (M = Co, Cu, Fe, Mn) were compared, and the trend of their activity is discussed. Cobalt was found to have the highest activity among the studied metal centers, and therefore has the best potential to serve as a bifunctional catalyst for alkaline electrolyzers.

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                Author and article information

                Contributors
                (View ORCID Profile)
                (View ORCID Profile)
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                Journal
                NANOHL
                Nanoscale
                Nanoscale
                Royal Society of Chemistry (RSC)
                2040-3364
                2040-3372
                March 4 2021
                2021
                : 13
                : 8
                : 4576-4584
                Affiliations
                [1 ]Department of Chemistry
                [2 ]Bar Ilan Institute for Nanotechnology and Advanced Materials (BINA)
                [3 ]Bar Ilan University
                [4 ]Ramat-Gan 52900
                [5 ]Israel
                [6 ]Department of Materials Science and Engineering
                [7 ]Technion – Israel Institute of Technology
                [8 ]Haifa 3200003
                [9 ]Department of Chemical Engineering
                Article
                10.1039/D0NR07875A
                e0c2d11b-3d45-4b9f-9f3f-52c88b5ea474
                © 2021

                http://rsc.li/journals-terms-of-use

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