scholarly journals Probing the local activity of CO2 reduction on gold gas diffusion electrodes: effect of the catalyst loading and CO2 pressure

2021 ◽  
Author(s):  
Mariana C. O. Monteiro ◽  
Stefan Dieckhöfer ◽  
Tim Bobrowski ◽  
Thomas Quast ◽  
Davide Pavesi ◽  
...  
Keyword(s):  
Carbon Capture ◽  
Large Scale ◽  
Co2 Reduction ◽  
Gas Diffusion ◽  
Catalyst Loading ◽  
Gas Diffusion Electrodes ◽  
Local Activity ◽  
Essential Step ◽  
Carbon Capture And Utilization

Large scale CO2 electrolysis can be achieved using gas diffusion electrodes (GDEs), and is an essential step towards broader implementation of carbon capture and utilization strategies. Different variables are known...

scholarly journals Investigation of Gas Diffusion Electrode Systems for the Electrochemical CO2 Conversion

Catalysts ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 482
Author(s):  
Hilmar Guzmán ◽  
Federica Zammillo ◽  
Daniela Roldán ◽  
Camilla Galletti ◽  
Nunzio Russo ◽  
...  
Keyword(s):  
Carbon Capture ◽  
Active Sites ◽  
Co2 Reduction ◽  
Gas Diffusion ◽  
Gas Diffusion Electrode ◽  
Catalyst Loading ◽  
Co2 Conversion ◽  
Atmospheric Conditions ◽  
Electrochemical Co2 Reduction ◽  
Liquid Products

Electrochemical CO2 reduction is a promising carbon capture and utilisation technology. Herein, a continuous flow gas diffusion electrode (GDE)-cell configuration has been studied to convert CO2 via electrochemical reduction under atmospheric conditions. To this purpose, Cu-based electrocatalysts immobilised on a porous and conductive GDE have been tested. Many system variables have been evaluated to find the most promising conditions able to lead to increased production of CO2 reduction liquid products, specifically: applied potentials, catalyst loading, Nafion content, KHCO3 electrolyte concentration, and the presence of metal oxides, like ZnO or/and Al2O3. In particular, the CO productivity increased at the lowest Nafion content of 15%, leading to syngas with an H2/CO ratio of ~1. Meanwhile, at the highest Nafion content (45%), C2+ products formation has been increased, and the CO selectivity has been decreased by 80%. The reported results revealed that the liquid crossover through the GDE highly impacts CO2 diffusion to the catalyst active sites, thus reducing the CO2 conversion efficiency. Through mathematical modelling, it has been confirmed that the increase of the local pH, coupled to the electrode-wetting, promotes the formation of bicarbonate species that deactivate the catalysts surface, hindering the mechanisms for the C2+ liquid products generation. These results want to shine the spotlight on kinetics and transport limitations, shifting the focus from catalytic activity of materials to other involved factors.

scholarly journals Electrochemical Reactors for CO2 Conversion

Catalysts ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 473 ◽  
Author(s):  
Roger Lin ◽  
Jiaxun Guo ◽  
Xiaojia Li ◽  
Poojan Patel ◽  
Ali Seifitokaldani
Keyword(s):  
Carbon Capture ◽  
Performance Metrics ◽  
Co2 Reduction ◽  
Reduction Reaction ◽  
Carbon Markets ◽  
Industrial Processing ◽  
Carbon Capture And Utilization ◽  
Co2 Diffusion ◽  
Challenges And Opportunities ◽  
Reactor Types

Increasing risks from global warming impose an urgent need to develop technologically and economically feasible means to reduce CO2 content in the atmosphere. Carbon capture and utilization technologies and carbon markets have been established for this purpose. Electrocatalytic CO2 reduction reaction (CO2RR) presents a promising solution, fulfilling carbon-neutral goals and sustainable materials production. This review aims to elaborate on various components in CO2RR reactors and relevant industrial processing. First, major performance metrics are discussed, with requirements obtained from a techno-economic analysis. Detailed discussions then emphasize on (i) technical benefits and challenges regarding different reactor types, (ii) critical features in flow cell systems that enhance CO2 diffusion compared to conventional H-cells, (iii) electrolyte and its effect on liquid phase electrolyzers, (iv) catalysts for feasible products (carbon monoxide, formic acid and multi-carbons) and (v) strategies on flow channel and anode design as next steps. Finally, specific perspectives on CO2 feeds for the reactor and downstream purification techniques are annotated as part of the CO2RR industrial processing. Overall, we focus on the component and system aspects for the design of a CO2RR reactor, while pointing out challenges and opportunities to realize the ultimate goal of viable carbon capture and utilization technology.

Copper Nanocubes for CO2 Reduction in Gas Diffusion Electrodes

Nano Letters ◽  
2019 ◽  
Vol 19 (12) ◽  
pp. 8461-8468 ◽  
Author(s):  
Yuxuan Wang ◽  
Hao Shen ◽  
Ken J. T. Livi ◽  
David Raciti ◽  
Han Zong ◽  
...  
Keyword(s):  
Co2 Reduction ◽  
Gas Diffusion ◽  
Gas Diffusion Electrodes

scholarly journals Water Activity Regulates CO2 Reduction in Gas-Diffusion Electrodes

2021 ◽  
Author(s):  
Nathan Nesbitt ◽  
Wilson Smith
Keyword(s):  
Gas Phase ◽  
Paradigm Shift ◽  
Reaction Rate ◽  
Co2 Reduction ◽  
Gas Diffusion ◽  
Equilibrium Potential ◽  
Gas Diffusion Electrodes ◽  
Reaction Thermodynamics ◽  
Current Densities ◽  
Reaction Equilibrium

<p>Electrochemical CO<sub>2</sub> reduction has recently reached current densities as high as 1 A cm<sup>-2</sup>, enabled by improving diffusion of CO<sub>2</sub> from the gas phase to the electrocatalyst by use of gas-diffusion electrodes (GDEs) and by improving electrolyte ionic conductivity with concentrated hydroxide electrolytes (7 M KOH). Despite such high solute concentrations, the dilute electrolyte assumption is commonly used to evaluate the thermodynamics of the system, specifically reaction equilibrium potential and reaction rate expression. Here we establish a paradigm shift by demonstrating how to properly include the activity of water and solutes and highlighting corrections to associated reaction thermodynamics.</p>

scholarly journals Liquid–Solid Boundaries Dominate Activity of CO2 Reduction on Gas-Diffusion Electrodes

ACS Catalysis ◽  
2020 ◽  
Vol 10 (23) ◽  
pp. 14093-14106
Author(s):  
Nathan T. Nesbitt ◽  
Thomas Burdyny ◽  
Hunter Simonson ◽  
Danielle Salvatore ◽  
Divya Bohra ◽  
...  
Keyword(s):  
Co2 Reduction ◽  
Gas Diffusion ◽  
Gas Diffusion Electrodes

scholarly journals CO2 reduction on gas-diffusion electrodes and why catalytic performance must be assessed at commercially-relevant conditions

2019 ◽  
Vol 12 (5) ◽  
pp. 1442-1453 ◽  
Author(s):  
Thomas Burdyny ◽  
Wilson A. Smith
Keyword(s):  
Local Reaction ◽  
Co2 Reduction ◽  
Catalytic Performance ◽  
Gas Diffusion ◽  
High Current ◽  
Gas Diffusion Electrodes ◽  
Current Densities ◽  
Current Practices

The substantial implications of high current densities on the local reaction environment and design of catalysts for electrochemical CO2 reduction are addressed. The presented perspectives also reflect on current practices within the field and offer new opportunities for both future catalyst and system-focused research efforts.

Sign in / Sign up

Export Citation Format

Share Document