DOI: https://doi.org/10.29363/nanoge.interect.2021.001
Publication date: 10th November 2021
In recent years, there is a growing interest in the incorporation of Metal-Organic Frameworks (MOFs) based thin films into electrochemical energy conversion schemes. In principle, MOF-based electrocatalytic systems hold several key virtues, such as the ability to immobilize unparalleled amount of catalytic sites; intrinsic inclusion of mass-transport channels; the ability to add molecular shuttles to deliver redox equivalents to and from the MOF-tethered catalytic sites; and finally, much like in catalytic enzymes, MOFs offer the possibility to modulate the catalyst’s secondary chemical environment. Indeed, over the last years several reports have demonstrated the concept of using electroactive MOF thin films as the catalytic component in the electrocatalytic cell, either through (a) the use of the MOF structural elements themselves (ligands or nodes) as electroactive catalysts, or (b) the immobilization of high concentration of active molecular catalysts within the MOF pores (for a wide variety of energy-related catalytic reactions as hydrogen evolution, water oxidation, oxygen reduction, and CO2 reduction). Yet, up to this point, the notion of using MOFs to precisely tune and manipulate the properties of the electrocatalytically active site and its surrounding chemical environment was overlooked.
In this talk, we will demonstrate for the first time that a non-electrocatalytic MOF can be used as a porous membrane layered over a solid heterogeneous electrocatalyst.[1] Following this principle, a suitably designed MOF membrane has the potential to modify the microenvironment of the underlying heterogeneous catalyst and affect its electrocatalytic properties in a wide variety of proton-coupled electron transfer (PCET) reactions.
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