scholarly journals Analysis of Mass Flows and Membrane Cross-over in CO2 Reduction at High Current Densities in an MEA-Type Electrolyzer

2019 ◽  
Vol 11 (44) ◽  
pp. 41281-41288 ◽  
Author(s):  
Gastón O. Larrazábal ◽  
Patrick Strøm-Hansen ◽  
Jens P. Heli ◽  
Kevin Zeiter ◽  
Kasper T. Therkildsen ◽  
...  
Keyword(s):  
Co2 Reduction ◽  
High Current ◽  
Current Densities ◽  
Mass Flows

Molecular electrocatalysts can mediate fast, selective CO2 reduction in a flow cell

Science ◽  
2019 ◽  
Vol 365 (6451) ◽  
pp. 367-369 ◽  
Author(s):  
Shaoxuan Ren ◽  
Dorian Joulié ◽  
Danielle Salvatore ◽  
Kristian Torbensen ◽  
Min Wang ◽  
...  
Keyword(s):  
Flow Reactor ◽  
Co2 Reduction ◽  
Reduction Reaction ◽  
Operating Conditions ◽  
High Current ◽  
Membrane Flow ◽  
Molecular Catalyst ◽  
Current Densities ◽  
Molecular Catalysts ◽  
Distinct Approach

Practical electrochemical carbon dioxide (CO2) conversion requires a catalyst capable of mediating the efficient formation of a single product with high selectivity at high current densities. Solid-state electrocatalysts achieve the CO2 reduction reaction (CO2RR) at current densities ≥ 150 milliamperes per square centimeter (mA/cm2), but maintaining high selectivities at high current densities and efficiencies remains a challenge. Molecular CO2RR catalysts can be designed to achieve high selectivities and low overpotentials but only at current densities irrelevant to commercial operation. We show here that cobalt phthalocyanine, a widely available molecular catalyst, can mediate CO2 to CO formation in a zero-gap membrane flow reactor with selectivities > 95% at 150 mA/cm2. The revelation that molecular catalysts can work efficiently under these operating conditions illuminates a distinct approach for optimizing CO2RR catalysts and electrolyzers.

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.

scholarly journals Operando Topography and Mechanical Property Mapping of CO2 Reduction Gas-Diffusion Electrodes Operating at High Current Densities

2021 ◽  
Author(s):  
Nathan Nesbitt ◽  
Wilson Smith
Keyword(s):  
Mechanical Property ◽  
Best Practices ◽  
Co2 Reduction ◽  
Gas Diffusion ◽  
High Current ◽  
Gas Diffusion Electrodes ◽  
Reactor Operation ◽  
Research Article ◽  
Depth Analysis ◽  
Current Densities

<p>Here, in this research article we develop an electrochemical flow cell for EC-AFM of GDEs for CO<sub>2</sub>R and provide an in-depth analysis of challenges, best practices, and possible future improvements for the technique. Specifically, we demonstrate continuous operando EC-AFM topography and mechanical property map recording during CO<sub>2</sub>R reactor operation at 1, 10, and 100 mA cm<sup>-2</sup>.<b></b></p>

scholarly journals Operando Topography and Mechanical Property Mapping of CO2 Reduction Gas-Diffusion Electrodes Operating at High Current Densities

2021 ◽  
Author(s):  
Nathan Nesbitt ◽  
Wilson Smith
Keyword(s):  
Mechanical Property ◽  
Best Practices ◽  
Co2 Reduction ◽  
Gas Diffusion ◽  
High Current ◽  
Gas Diffusion Electrodes ◽  
Reactor Operation ◽  
Research Article ◽  
Depth Analysis ◽  
Current Densities

<p>Here, in this research article we develop an electrochemical flow cell for EC-AFM of GDEs for CO<sub>2</sub>R and provide an in-depth analysis of challenges, best practices, and possible future improvements for the technique. Specifically, we demonstrate continuous operando EC-AFM topography and mechanical property map recording during CO<sub>2</sub>R reactor operation at 1, 10, and 100 mA cm<sup>-2</sup>.<b></b></p>

Three-dimensional porous copper-decorated bismuth-based nanofoam for boosting electrochemical reduction of CO2 to formate

2021 ◽  
Author(s):  
Yingchun Zhang ◽  
Changsheng Cao ◽  
Xintao Wu ◽  
Qi-Long Zhu
Keyword(s):  
Current Density ◽  
High Current Density ◽  
Three Dimensional ◽  
Co2 Reduction ◽  
Reduction Reaction ◽  
High Current ◽  
Porous Copper ◽  
Reduction Of Co2 ◽  
Co2 Reduction Reaction ◽  
Wide Potential

Bismuth (Bi)-based nanomaterials are considered as the promising electrocatalysts for electrocatalytic CO2 reduction reaction (CO2RR), but it is challenging to achieve high current density and selectivity in a wide potential...

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