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Title: Investigating Electrode Flooding in a Flowing Electrolyte, Gas‐Fed Carbon Dioxide Electrolyzer

Journal Article · · ChemSusChem

Abstract Managing the gas–liquid interface within gas‐diffusion electrodes (GDEs) is key to maintaining high product selectivities in carbon dioxide electroreduction. By screening silver‐catalyzed GDEs over a range of applied current densities, an inverse correlation was observed between carbon monoxide selectivity and the electrochemical double‐layer capacitance, a proxy for wetted electrode area. Plotting current‐dependent performance as a function of cumulative charge led to data collapse onto a single sigmoidal curve indicating that the passage of faradaic current accelerates flooding. It was hypothesized that high cathode alkalinity, driven by both initial electrolyte conditions and cathode half‐reactions, promotes carbonate formation and precipitation which, in turn, facilitates electrolyte permeation. This mechanism was reinforced by the observations that post‐test GDEs retain less hydrophobicity than pristine materials and that water‐rinsing and drying electrodes temporarily recovers peak selectivity. This knowledge offers an opportunity to design electrodes with greater carbonation tolerance to improve device longevity.

Sponsoring Organization:
USDOE
Grant/Contract Number:
SC0015173
OSTI ID:
1579595
Journal Information:
ChemSusChem, Journal Name: ChemSusChem Journal Issue: 2 Vol. 13; ISSN 1864-5631
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

References (77)

The Effects of Catalyst Layer Deposition Methodology on Electrode Performance journal February 2013
Selective and Efficient Reduction of Carbon Dioxide to Carbon Monoxide on Oxide-Derived Nanostructured Silver Electrocatalysts journal July 2016
Selective and Efficient Reduction of Carbon Dioxide to Carbon Monoxide on Oxide-Derived Nanostructured Silver Electrocatalysts journal July 2016
Electrochemical CO2 Reduction on Metal Electrodes book January 2008
Effect of carbon dioxide on the performance of Ni/PTFE and Ag/PTFE electrodes in an alkaline fuel cell journal June 1994
Electroreduction of carbon dioxide to formate at high current densities using tin and tin oxide gas diffusion electrodes journal July 2019
Capillary Hysteresis in Neutrally Wettable Fibrous Media: A Pore Network Study of a Fuel Cell Electrode journal December 2017
Degradation of some carbon-chain polymers by electrochemical reduction journal January 1985
On the problem of ageing of carbon—air electrodes in alkaline electrolytes journal January 1980
Deconvolution of electrochemical double layer capacitance between fractions of active and total surface area of graphite felts journal January 2017
Influence of flow and pressure distribution inside a gas diffusion electrode on the performance of a flow-by CO2 electrolyzer journal December 2019
Progress toward Commercial Application of Electrochemical Carbon Dioxide Reduction journal November 2018
Neutron imaging of fuel cells – Recent trends and future prospects journal October 2017
Direct measurement of the capillary pressure characteristics of water–air–gas diffusion layer systems for PEM fuel cells journal October 2008
On the role of the microporous layer in PEMFC operation journal March 2009
Simultaneous neutron imaging of six operating PEFCs: Experimental set-up and study of the MPL effect journal July 2012
Influence of dilute feed and pH on electrochemical reduction of CO2 to CO on Ag in a continuous flow electrolyzer journal June 2015
Electrochemical conversion of CO2 to formic acid utilizing Sustainion™ membranes journal July 2017
Electrochemical CO2 reduction using alkaline membrane electrode assembly on various metal electrodes journal May 2019
A Process for Capturing CO2 from the Atmosphere journal August 2018
Capillary pressure and hydrophilic porosity in gas diffusion layers for polymer electrolyte fuel cells journal June 2006
Wettability and capillary behavior of fibrous gas diffusion media for polymer electrolyte membrane fuel cells journal October 2009
Carbonate resilience of flowing electrolyte-based alkaline fuel cells journal February 2011
Ex-situ characterisation of gas diffusion layers for proton exchange membrane fuel cells journal November 2012
One-step electrosynthesis of ethylene and ethanol from CO2 in an alkaline electrolyzer journal January 2016
Effects of composition of the micro porous layer and the substrate on performance in the electrochemical reduction of CO2 to CO journal April 2016
4-acetamido-2,2,6,6-tetramethylpiperidine-1-oxyl as a model organic redox active compound for nonaqueous flow batteries journal September 2016
Improving water management in fuel cells through microporous layer modifications: Fast operando tomographic imaging of liquid water journal September 2019
Determination of the rate constants for the carbon dioxide to bicarbonate inter-conversion in pH-buffered seawater systems journal June 2006
Water flow in the gas diffusion layer of PEM fuel cells journal September 2005
Continuous-flow electroreduction of carbon dioxide journal September 2017
Redox-Mediated Separation of Carbon Dioxide from Flue Gas journal October 2015
Double Layer Capacitance Measurements To Characterize the Water Intrusion into Porous Materials journal October 2016
Investigating Evaporation in Gas Diffusion Layers for Fuel Cells with X-ray Computed Tomography journal December 2016
Wettability of a Single Carbon Fiber journal September 2016
Characterization of the Intrinsic Water Wettability of Graphite Using Contact Angle Measurements: Effect of Defects on Static and Dynamic Contact Angles journal January 2017
Analysis of Mass Flows and Membrane Cross-over in CO 2 Reduction at High Current Densities in an MEA-Type Electrolyzer journal October 2019
Electrolysis of Gaseous CO 2 to CO in a Flow Cell with a Bipolar Membrane journal November 2017
Insights into the Low Overpotential Electroreduction of CO 2 to CO on a Supported Gold Catalyst in an Alkaline Flow Electrolyzer journal November 2017
High Rate, Selective, and Stable Electroreduction of CO 2 to CO in Basic and Neutral Media journal October 2018
Introductory Guide to Assembling and Operating Gas Diffusion Electrodes for Electrochemical CO 2 Reduction journal February 2019
Multilayer Electrolyzer Stack Converts Carbon Dioxide to Gas Products at High Pressure with High Efficiency journal June 2019
Modeling Transport in Polymer-Electrolyte Fuel Cells journal October 2004
Ab Initio Thermodynamic Study of the CO 2 Capture Properties of Potassium Carbonate Sesquihydrate, K 2 CO 3 ·1.5H 2 O journal June 2012
What Is the Contact Angle of Water on Graphene? journal January 2013
Surface Tension of Aqueous Solutions of Potassium Hydroxide journal December 1962
Technical photosynthesis involving CO2 electrolysis and fermentation journal January 2018
CO 2 separation using bipolar membrane electrodialysis journal January 2011
Insights into the electrocatalytic reduction of CO 2 on metallic silver surfaces journal January 2014
The effect of electrolyte composition on the electroreduction of CO 2 to CO on Ag based gas diffusion electrodes journal January 2016
Effects of temperature and gas–liquid mass transfer on the operation of small electrochemical cells for the quantitative evaluation of CO 2 reduction electrocatalysts journal January 2016
Modeling gas-diffusion electrodes for CO 2 reduction journal January 2018
Combined high alkalinity and pressurization enable efficient CO 2 electroreduction to CO journal January 2018
CO 2 reduction on gas-diffusion electrodes and why catalytic performance must be assessed at commercially-relevant conditions journal January 2019
Towards membrane-electrode assembly systems for CO 2 reduction: a modeling study journal January 2019
An alkaline polymer electrolyte CO 2 electrolyzer operated with pure water journal January 2019
New insights into the electrochemical reduction of carbon dioxide on metallic copper surfaces journal January 2012
The Solubility of Carbon Dioxide in Water at Low Pressure journal November 1991
Damage in porous media due to salt crystallization journal June 2010
Discrete Salt Crystallization at the Surface of a Porous Medium journal February 2012
Carbonate Dynamics and Opportunities With Low Temperature, Anion Exchange Membrane-Based Electrochemical Carbon Dioxide Separators journal May 2017
CO 2 electroreduction to ethylene via hydroxide-mediated copper catalysis at an abrupt interface journal May 2018
What would it take for renewably powered electrosynthesis to displace petrochemical processes? journal April 2019
A Historical Perspective of Fuel Cell Technology in the 20th Century journal January 2002
Preparation of Air Electrodes and Long Run Tests journal January 1991
High Rate Gas Phase CO[sub 2] Reduction to Ethylene and Methane Using Gas Diffusion Electrodes journal January 1990
Surface Properties of PEMFC Gas Diffusion Layers journal January 2010
Water Transport Mechanisms in PEMFC Gas Diffusion Layers journal January 2010
Advanced Water Management in PEFCs: Diffusion Layers with Patterned Wettability: I. Synthetic Routes, Wettability Tuning and Thermal Stability journal January 2016
Liquid-Water Interactions with Gas-Diffusion-Layer Surfaces journal January 2014
Characterization of Liquid Water Saturation in Gas Diffusion Layers by X-Ray Tomographic Microscopy journal December 2015
CO 2 Electrolysis to CO and O 2 at High Selectivity, Stability and Efficiency Using Sustainion Membranes journal January 2018
Advanced Water Management in PEFCs: Diffusion Layers with Patterned Wettability: II. Measurement of Capillary Pressure Characteristic with Neutron and Synchrotron Imaging journal January 2016
Advanced Water Management in PEFCs: Diffusion Layers with Patterned Wettability: III. Operando Characterization with Neutron Imaging journal January 2016
Modeling and Experimental Validation of Electrochemical Reduction of CO 2 to CO in a Microfluidic Cell journal November 2014
Efficient Electrochemical Flow System with Improved Anode for the Conversion of CO2 to CO journal January 2014
Impact of Microporous Layer Pore Properties on Liquid Water Transport in PEM Fuel Cells: Carbon Black Type and Perforation journal January 2017