scholarly journals In Situ Observation of the pH Gradient near the Gas Diffusion Electrode of CO2 Reduction in Alkaline Electrolyte

2020 ◽  
Vol 142 (36) ◽  
pp. 15438-15444 ◽  
Author(s):  
Xu Lu ◽  
Chongqin Zhu ◽  
Zishan Wu ◽  
Jin Xuan ◽  
Joseph S. Francisco ◽  
...  
Keyword(s):  
Co2 Reduction ◽  
Gas Diffusion ◽  
Gas Diffusion Electrode ◽  
Ph Gradient ◽  
Alkaline Electrolyte ◽  
In Situ Observation

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.

In-situ catalytic oxidation of Hg0 via a gas diffusion electrode

2017 ◽  
Vol 310 ◽  
pp. 170-178 ◽  
Author(s):  
Yi Xu ◽  
Limei Cao ◽  
Wei Sun ◽  
Ji Yang
Keyword(s):  
Catalytic Oxidation ◽  
Gas Diffusion ◽  
Gas Diffusion Electrode

Electrochemically deposited Sn catalysts with dense tips on a gas diffusion electrode for electrochemical CO2 reduction

2020 ◽  
Vol 8 (18) ◽  
pp. 9032-9038 ◽  
Author(s):  
Jinkyu Lim ◽  
Phil Woong Kang ◽  
Sun Seo Jeon ◽  
Hyunjoo Lee
Keyword(s):  
Co2 Reduction ◽  
Gas Diffusion ◽  
Gas Diffusion Electrode ◽  
Electrochemical Co2 Reduction ◽  
Electrochemically Deposited

Productivity of formates from electrochemical CO2 reduction was enhanced by using a Sn catalyst with dense tips electrodeposited on a gas diffusion electrode.

scholarly journals Optimizing the use of a “Zero-Gap” Gas Diffusion Electrode Setup for Electrochemical Reduction of CO2

2021 ◽  
Author(s):  
Shima Alinejad ◽  
Jonathan Quinson ◽  
Yao Li ◽  
Ying Kong ◽  
Sven Reichenberger ◽  
...  
Keyword(s):  
Co2 Reduction ◽  
Catalyst Layer ◽  
Gas Diffusion ◽  
Reduction Reaction ◽  
Gas Diffusion Electrode ◽  
Test Bed ◽  
Catalyst Screening ◽  
Electrochemical Co2 Reduction ◽  
Reduction Of Co2 ◽  
Co2 Reduction Reaction

The lack of a robust and standardized experimental test bed to investigate the performance of catalyst materials for the electrochemical CO2 reduction reaction (ECO2RR) is one of the major challenges in this field of research. To best reproduce and mimic commercially relevant conditions for catalyst screening and testing, gas diffusion electrode (GDE) setups attract a rising attention as an alternative to conventional aqueous-based setups such as the H-cell configuration. In particular a zero-gap design shows promising features for upscaling to the commercial scale. In this study, we develop further our recently introduced zero-gap GDE setup for the CO2RR using an Au electrocatalyst as model system and identify/report the key experimental parameters to control in the catalyst layer preparation in order to optimize the activity and selectivity of the catalyst.

Use of Gas Diffusion Electrode for the In Situ Generation of Hydrogen Peroxide in an Electrochemical Flow-By Reactor

2011 ◽  
Vol 51 (2) ◽  
pp. 649-654 ◽  
Author(s):  
Rafael M. Reis ◽  
André A. G. F. Beati ◽  
Robson S. Rocha ◽  
Mônica H. M. T. Assumpção ◽  
Mauro C. Santos ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Gas Diffusion ◽  
Gas Diffusion Electrode ◽  
In Situ Generation
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