Maximizing Ag Utilization in High-Rate CO<sub>2</sub> Electrochemical Reduction with a Coordination Polymer-Mediated Gas Diffusion Electrode

Journal article (2019)

Authors

Henrik Haspel King Abdullah University of Science and Technology
O. Pustovarenko King Abdullah University of Science and Technology,
A. Dikhtiarenko King Abdullah University of Science and Technology,
M. Ma ChemE/Materials for Energy Conversion and Storage - AS
W.A. Smith ChemE/Materials for Energy Conversion and Storage - AS
J. Gascon Sabate King Abdullah University of Science and Technology
Copyright: © 2019 R. Wang, Henrik Haspel, Alexey Pustovarenko, A. Dikhtiarenko, D. Osadchii, M. Ma, W.A. Smith, F. Kapteijn, Jorge Gascon
DOI
help_outline
https://doi.org/10.1021/acsenergylett.9b01509
More Info
expand_more

Published Date

2019

Language

English

Reuse Rights

Other than for strictly personal use, it is not permitted to download, forward or distribute the text or part of it, without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license such as Creative Commons.

Abstract

We report the preparation and electrocatalytic performance of silver-containing gas diffusion electrodes (GDEs) derived from a silver coordination polymer (Ag-CP). Layer-by-layer growth of the Ag-CP onto porous supports was applied to control Ag loading. Subsequent electro-decomposition of the Ag-CP resulted in highly selective and efficient CO2-to-CO GDEs in aqueous CO2 electroreduction. Afterward, the metal-organic framework (MOF)-mediated approach was transferred to a gas-fed flow electrolyzer for high current density tests. The in situ formed GDE, with a low silver loading of 0.2 mg cm-2, showed a peak performance of jCO ≈ 385 mA cm-2 at around -1.0 V vs RHE and stable operation with high FECO (>96%) at jTotal = 300 mA cm-2 over a 4 h run. These results demonstrate that the MOF-mediated approach offers a facile route for manufacturing uniformly dispersed Ag catalysts for CO2 electrochemical reduction by eliminating ill-defined deposition steps (drop-casting, etc.) while allowing control of the catalyst structure through self-assembly.