Affiliation:
1. Department of Chemistry and Ilse Katz Institute for Nanoscale Science and Technology Ben-Gurion University of the Negev Beer-Sheva 8410501 Israel
Abstract
Metal–organic frameworks (MOFs) are a promising platform for assembling large concentrations of molecular catalysts on surfaces to drive the electroreduction of CO2. Yet until now, these MOF‐based systems were shown to produce only 2‐electron/proton products, i.e., CO or formic acid. Herein, it is demonstrated that a cobalt 5,10,15,20‐tetra(4‐carboxyphenyl) porphyrin (CoTCPP)‐based MOF can produce significant quantities of an 8‐electron/proton CH4, via a photo‐assisted electrocatalytic approach. Specifically, detailed electrochemical and spectro‐electrochemical analyses show that the addition of light illumination during electrocatalysis promotes the stabilization of a catalyst‐bound CO intermediate, allowing its further reduction to the final product, CH4. Using the photo‐assisted electrocatalysis method, maximum CH4 Faradaic efficiency of 14% was obtained at a low potential of −0.49 V
NHE. Hence, the presented concept provides an additional step toward the design of more efficient MOF‐based electrocatalytic systems.
Funder
Israel Science Foundation
Subject
Electrical and Electronic Engineering,Energy Engineering and Power Technology,Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials
Cited by
4 articles.
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