Electrosynthesis of methanol from methane: The role of V2O5 in the reaction selectivity for methanol of a TiO2/RuO2/V2O5 gas diffusion electrode

2013 ◽  
Vol 87 ◽  
pp. 606-610 ◽  
Author(s):  
Robson S. Rocha ◽  
Rafael M. Reis ◽  
Marcos R.V. Lanza ◽  
Rodnei Bertazzoli
Keyword(s):  
Gas Diffusion ◽  
Gas Diffusion Electrode ◽  
Reaction Selectivity

The role of membrane ion exchange capacity on membrane|gas diffusion electrode interfaces: a half-fuel cell electrochemical study

2004 ◽  
Vol 567 (1) ◽  
pp. 111-122 ◽  
Author(s):  
Titichai Navessin ◽  
Steven Holdcroft ◽  
Qianpu Wang ◽  
Datong Song ◽  
Zhongsheng Liu ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Ion Exchange ◽  
Gas Diffusion ◽  
Exchange Capacity ◽  
Gas Diffusion Electrode ◽  
Electrochemical Study ◽  
Ion Exchange Capacity

scholarly journals Role of ion-selective membranes in the carbon balance for CO2 electroreduction via gas diffusion electrode reactor designs

2020 ◽  
Vol 11 (33) ◽  
pp. 8854-8861 ◽  
Author(s):  
Ming Ma ◽  
Sangkuk Kim ◽  
Ib Chorkendorff ◽  
Brian Seger
Keyword(s):  
Carbon Balance ◽  
Gas Diffusion ◽  
Gas Diffusion Electrode ◽  
High Rate ◽  
Co2 Electroreduction ◽  
Type Flow ◽  
Selective Membranes

In this work, the effect of ion-selective membranes on the detailed carbon balance was systematically analyzed for high-rate CO2 reduction in GDE-type flow electrolyzers.

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.

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