scholarly journals Metallic Porous Electrodes Enable Efficient Bicarbonate Electrolysis

2021 ◽  
Author(s):  
Zishuai Zhang ◽  
Eric W. Lees ◽  
Faezeh Habibzadeh ◽  
Danielle A. Salvatore ◽  
Shaoxuan Ren ◽  
...  
Keyword(s):  
Carbon Capture ◽  
Gas Diffusion ◽  
Porous Electrodes ◽  
Free Standing ◽  
Faradaic Efficiency ◽  
Performance Loss ◽  
Added Benefit ◽  
Silver Electrodes ◽  
Bicarbonate Solutions ◽  
Porous Silver

<p>We demonstrate here that a porous free-standing silver foam cathode in an electrolytic flow electrolyzer mediates efficient electrolysis of 3.0 M bicarbonate solutions into CO. These results have direct implications for carbon capture schemes where OH- solutions react with CO2 to form bicarbonate-rich solutions that need to be treated to recycle the sorbent and recover the CO2. Our study shows a viable path for replacing the high-temperature thermal process currently used to recover CO2 from these carbon</p><p>capture solutions by using electricity to drive the conversion of bicarbonate into CO2 and subsequently into CO. The use of free-standing porous silver electrodes was found to yield electrolysis performance parameters (e.g., a Faradaic efficiency for CO production, FECO, of 95% at 100 mA cm2; <3% performance loss after 80 h operation) that are superior to results obtained in bicarbonate electrolyzers that utilize conventional carbon-based gas diffusion electrodes (GDEs) designed for gaseous CO2 fed electrolyzers. This liquid-fed bicarbonate electrolyzer achieves high CO formation rates with the added benefit of not requiring an energy-intensive CO2 regeneration step that would be necessary for the electrolysis of gaseous CO2. These findings represent a potentially important step in closing the carbon cycle.</p>

scholarly journals Metallic Porous Electrodes Enable Efficient Bicarbonate Electrolysis

2021 ◽  
Author(s):  
Zishuai Zhang ◽  
Eric W. Lees ◽  
Faezeh Habibzadeh ◽  
Danielle A. Salvatore ◽  
Shaoxuan Ren ◽  
...  
Keyword(s):  
Carbon Capture ◽  
Gas Diffusion ◽  
Porous Electrodes ◽  
Free Standing ◽  
Faradaic Efficiency ◽  
Performance Loss ◽  
Added Benefit ◽  
Silver Electrodes ◽  
Bicarbonate Solutions ◽  
Porous Silver

<p>We demonstrate here that a porous free-standing silver foam cathode in an electrolytic flow electrolyzer mediates efficient electrolysis of 3.0 M bicarbonate solutions into CO. These results have direct implications for carbon capture schemes where OH- solutions react with CO2 to form bicarbonate-rich solutions that need to be treated to recycle the sorbent and recover the CO2. Our study shows a viable path for replacing the high-temperature thermal process currently used to recover CO2 from these carbon</p><p>capture solutions by using electricity to drive the conversion of bicarbonate into CO2 and subsequently into CO. The use of free-standing porous silver electrodes was found to yield electrolysis performance parameters (e.g., a Faradaic efficiency for CO production, FECO, of 95% at 100 mA cm2; <3% performance loss after 80 h operation) that are superior to results obtained in bicarbonate electrolyzers that utilize conventional carbon-based gas diffusion electrodes (GDEs) designed for gaseous CO2 fed electrolyzers. This liquid-fed bicarbonate electrolyzer achieves high CO formation rates with the added benefit of not requiring an energy-intensive CO2 regeneration step that would be necessary for the electrolysis of gaseous CO2. These findings represent a potentially important step in closing the carbon cycle.</p>

scholarly journals Metallic Porous Electrodes Enable Efficient Bicarbonate Electrolysis

2020 ◽  
Author(s):  
Zishuai Zhang ◽  
Faezeh Habibzadeh ◽  
Danielle A. Salvatore ◽  
Shaoxuan Ren ◽  
Eric W. Lees ◽  
...  
Keyword(s):  
Carbon Capture ◽  
Performance Metrics ◽  
Flow Cell ◽  
Gas Diffusion ◽  
Porous Electrodes ◽  
Free Standing ◽  
Faradaic Efficiency ◽  
Performance Loss ◽  
Bicarbonate Solutions ◽  
Porous Silver

We demonstrate here that a porous free-standing silver foam cathode in an electrolytic flow cell mediates efficient electrolysis of 3.0 M bicarbonate solutions into CO. These results have direct implications for carbon capture schemes where OH- solutions react with CO2 to form bicarbonate-rich solutions that need to be treated to recycle the sorbent and recover the CO2. Our study shows a viable path for replacing the high-temperature thermal process currently used to recover CO2 from these carbon capture solutions by using electricity to drive the conversion of bicarbonate into CO2 and subsequently into CO. The use of free-standing porous silver electrodes was found to yield electrolysis performance parameters (e.g., a Faradaic efficiency for CO production, FECO, of 78% at 100 mA cm2; <3% performance loss after 80 h operation) that are superior to results obtained in bicarbonate electrolyzers that utilize conventional carbon-based gas diffusion electrodes (GDEs) designed for gaseous CO2 fed electrolyzers. These performance metrics are comparable to any electrolytic flow cell fed directly with a CO2 feedstock, with the added benefit of not requiring an energy-intensive pressurization step that would be necessary for the electrolysis of gaseous CO2. These findings represent a potentially important step in closing the carbon cycle.

scholarly journals Metallic Porous Electrodes Enable Efficient Bicarbonate Electrolysis

2020 ◽  
Author(s):  
Zishuai Zhang ◽  
Faezeh Habibzadeh ◽  
Danielle A. Salvatore ◽  
Shaoxuan Ren ◽  
Eric W. Lees ◽  
...  
Keyword(s):  
Carbon Capture ◽  
Performance Metrics ◽  
Flow Cell ◽  
Gas Diffusion ◽  
Porous Electrodes ◽  
Free Standing ◽  
Faradaic Efficiency ◽  
Performance Loss ◽  
Bicarbonate Solutions ◽  
Porous Silver

We demonstrate here that a porous free-standing silver foam cathode in an electrolytic flow cell mediates efficient electrolysis of 3.0 M bicarbonate solutions into CO. These results have direct implications for carbon capture schemes where OH- solutions react with CO2 to form bicarbonate-rich solutions that need to be treated to recycle the sorbent and recover the CO2. Our study shows a viable path for replacing the high-temperature thermal process currently used to recover CO2 from these carbon capture solutions by using electricity to drive the conversion of bicarbonate into CO2 and subsequently into CO. The use of free-standing porous silver electrodes was found to yield electrolysis performance parameters (e.g., a Faradaic efficiency for CO production, FECO, of 78% at 100 mA cm2; <3% performance loss after 80 h operation) that are superior to results obtained in bicarbonate electrolyzers that utilize conventional carbon-based gas diffusion electrodes (GDEs) designed for gaseous CO2 fed electrolyzers. These performance metrics are comparable to any electrolytic flow cell fed directly with a CO2 feedstock, with the added benefit of not requiring an energy-intensive pressurization step that would be necessary for the electrolysis of gaseous CO2. These findings represent a potentially important step in closing the carbon cycle.

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 H2-CO2 polymer electrolyte fuel cell that generates power while evolving CH4 at the Pt0.8Ru0.2/C cathode

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Shofu Matsuda ◽  
Yuuki Niitsuma ◽  
Yuta Yoshida ◽  
Minoru Umeda
Keyword(s):  
Fuel Cell ◽  
Electric Power ◽  
Polymer Electrolyte ◽  
Carbon Capture ◽  
Polymer Electrolyte Fuel Cell ◽  
Cell Temperature ◽  
Faradaic Efficiency ◽  
Carbon Capture And Utilization ◽  
Electrode Potentials ◽  
A Cell

AbstractGenerating electric power using CO2 as a reactant is challenging because the electroreduction of CO2 usually requires a large overpotential. Herein, we report the design and development of a polymer electrolyte fuel cell driven by feeding H2 and CO2 to the anode (Pt/C) and cathode (Pt0.8Ru0.2/C), respectively, based on their theoretical electrode potentials. Pt–Ru/C is a promising electrocatalysts for CO2 reduction at a low overpotential; consequently, CH4 is continuously produced through CO2 reduction with an enhanced faradaic efficiency (18.2%) and without an overpotential (at 0.20 V vs. RHE) was achieved when dilute CO2 is fed at a cell temperature of 40 °C. Significantly, the cell generated electric power (0.14 mW cm−2) while simultaneously yielding CH4 at 86.3 μmol g−1 h−1. These results show that a H2-CO2 fuel cell is a promising technology for promoting the carbon capture and utilization (CCU) strategy.

scholarly journals Linker modulated peroxide electrosynthesis using metal-organic nanosheets

2021 ◽  
Author(s):  
Kiran Kuruvinashetti ◽  
Nikolay Kornienko
Keyword(s):  
Analytical Techniques ◽  
Gas Diffusion ◽  
Diffusion Reaction ◽  
Alkaline Electrolyte ◽  
Faradaic Efficiency ◽  
Catalytic Sites ◽  
Oxygen Reduction Catalysts ◽  
Metal Organic ◽  
Reduction Catalysts ◽  
Partial Current

The electrochemical synthesis of hydrogen peroxide (H2O2), a widely used oxidant, is emerging as a green alternative to the conventional anthraquinone method. In this work, Ni-based metal-organic nanosheet (Ni-MONs) catalysts constructed using a variety of linkers were studied as oxygen reduction catalysts. Using a host of analytical techniques, we reveal how modulating the terephthalic acid linker with hydroxy, amine, and fluorine groups impacts the resulting physical and electronic structure of the Ni catalytic sites. These changes further impact the selectivity for H2O2, with the Ni-Amine-MON reaching near 100% Faradaic efficiency at minimal overpotential for the 2e- H2O2 pathway in alkaline electrolyte. Finally, we translate the Ni-Amine-MON catalyst to a gas-diffusion reaction geometry and demonstrate a H2O2 partial current density of 200 mA/cm2 while maintaining 85% Faradaic efficiency. In all, this study puts forth a simple route to catalyst modulation for highly effective H2O2 electrosynthesis.

The Effects of Gas Diffusion in Molten Carbonate Fuel Cells Working as Carbon Capture Devices

2020 ◽  
Vol 167 (11) ◽  
pp. 114515
Author(s):  
E. Audasso ◽  
B. Bosio ◽  
D. Bove ◽  
E. Arato ◽  
T. Barckholtz ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Carbon Capture ◽  
Gas Diffusion ◽  
Molten Carbonate ◽  
Molten Carbonate Fuel Cells

Thickness- and Particle-Size-Dependent Electrochemical Reduction of Carbon Dioxide on Thin-Layer Porous Silver Electrodes

ChemSusChem ◽  
2016 ◽  
Vol 9 (5) ◽  
pp. 428-432 ◽  
Author(s):  
Lin Zhang ◽  
Zhiyong Wang ◽  
Nada Mehio ◽  
Xianbo Jin ◽  
Sheng Dai
Keyword(s):  
Carbon Dioxide ◽  
Particle Size ◽  
Thin Layer ◽  
Electrochemical Reduction ◽  
Size Dependent ◽  
Silver Electrodes ◽  
Porous Silver

Numerical Simulation of SOFC Performance Affected by Cathode Mesoscale-Structure Control

2008 ◽  
Author(s):  
Akio Konno ◽  
Hiroshi Iwai ◽  
Motohiro Saito ◽  
Hideo Yoshida
Keyword(s):  
Numerical Simulation ◽  
Current Density ◽  
Porous Electrode ◽  
Gas Diffusion ◽  
Porous Electrodes ◽  
Cell Performance ◽  
Structure Control ◽  
Mesoscale Structures ◽  
Mesoscale Structure ◽  
Electrolyte Interface

Increase of the current density is one of the most important topics in the development of solid oxide fuel cells. In this study we focus on the possibility of the current density enhancement by controlling the mesoscale structure of the electrodes. Modifications of the mesoscale structures increase the area of electrode-electrolyte interface and the volume of the electrode, reduce the electrolyte thickness, affect gas diffusion in the porous electrode and consequently influence the cell performance. To evaluate its effect on the cell performance, two-dimensional numerical simulation for SOFC with and without mesoscale grooves on the cathode-electrolyte interface is conducted to understand the effects of such cathode mesoscale structure on the cell performance. It is found that the electrochemical reaction in porous electrodes takes place in the region close to the electrode-electrolyte interface and the cell performance can be improved by applying cathode mesoscale structures.

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