Proton-Coupled Electron Transfer Cleavage of Heavy-Atom Bonds in Electrocatalytic Processes. Cleavage of a C–O Bond in the Catalyzed Electrochemical Reduction of CO2

2013 ◽  
Vol 135 (24) ◽  
pp. 9023-9031 ◽  
Author(s):  
Cyrille Costentin ◽  
Samuel Drouet ◽  
Guillaume Passard ◽  
Marc Robert ◽  
Jean-Michel Savéant
Keyword(s):  
Electron Transfer ◽  
Electrochemical Reduction ◽  
Heavy Atom ◽  
Proton Coupled Electron Transfer ◽  
Reduction Of Co2

Electrochemical Reduction of Aqueous Imidazolium on Pt(111) by Proton Coupled Electron Transfer

2014 ◽  
Vol 58 (1) ◽  
pp. 23-29 ◽  
Author(s):  
Kuo Liao ◽  
Mikhail Askerka ◽  
Elizabeth L. Zeitler ◽  
Andrew B. Bocarsly ◽  
Victor S. Batista
Keyword(s):  
Electron Transfer ◽  
Electrochemical Reduction ◽  
Proton Coupled Electron Transfer

scholarly journals pH Swing Cycle for CO2 Capture Electrochemically Driven through Proton-Coupled Electron Transfer

2019 ◽  
Author(s):  
Michael Aziz ◽  
David G. Kwabi
Keyword(s):  
Electron Transfer ◽  
Electrochemical Reduction ◽  
Flue Gas ◽  
Open Circuit ◽  
Solution Ph ◽  
Proton Coupled Electron Transfer ◽  
Work Input ◽  
Air Capture ◽  
Electrochemical Redox ◽  
Ph Swing

We propose and perform a thermodynamic analysis of the energetic costs of CO<sub>2</sub> separation from flue gas using a pH swing created by electrochemical redox reactions involving proton-coupled electron transfer from molecular species in aqueous electrolyte. Electrochemical reduction of these molecules results in the formation of alkaline solution, into which CO<sub>2</sub> is absorbed; subsequent electrochemical oxidation of the reduced molecules results in the acidification of the solution, triggering the release of pure CO<sub>2</sub> gas. We examined the effect of buffering from the CO<sub>2</sub>-carbonate system on the solution pH during this pH swing cycle, and thus on the open-circuit potential of a hypothetical electrochemical cell in a 4-step CO<sub>2</sub> capture-release cycle. The thermodynamic minimum work input varies from 16 to 75 kJ/mol<sub>CO2 </sub>as throughput increases, for both flue gas and direct air capture, with the potential to go substantially lower if CO<sub>2</sub> capture or release is performed simultaneously with electrochemical reduction or oxidation. These values are compared with those for other separation methods. We discuss the properties required of molecules that would be suitable for such a cycle.

scholarly journals pH Swing Cycle for CO2 Capture Electrochemically Driven through Proton-Coupled Electron Transfer

2019 ◽  
Author(s):  
Michael Aziz ◽  
David G. Kwabi
Keyword(s):  
Electron Transfer ◽  
Electrochemical Reduction ◽  
Flue Gas ◽  
Open Circuit ◽  
Solution Ph ◽  
Proton Coupled Electron Transfer ◽  
Work Input ◽  
Air Capture ◽  
Electrochemical Redox ◽  
Ph Swing

We propose and perform a thermodynamic analysis of the energetic costs of CO<sub>2</sub> separation from flue gas using a pH swing created by electrochemical redox reactions involving proton-coupled electron transfer from molecular species in aqueous electrolyte. Electrochemical reduction of these molecules results in the formation of alkaline solution, into which CO<sub>2</sub> is absorbed; subsequent electrochemical oxidation of the reduced molecules results in the acidification of the solution, triggering the release of pure CO<sub>2</sub> gas. We examined the effect of buffering from the CO<sub>2</sub>-carbonate system on the solution pH during this pH swing cycle, and thus on the open-circuit potential of a hypothetical electrochemical cell in a 4-step CO<sub>2</sub> capture-release cycle. The thermodynamic minimum work input varies from 16 to 75 kJ/mol<sub>CO2 </sub>as throughput increases, for both flue gas and direct air capture, with the potential to go substantially lower if CO<sub>2</sub> capture or release is performed simultaneously with electrochemical reduction or oxidation. These values are compared with those for other separation methods. We discuss the properties required of molecules that would be suitable for such a cycle.

High efficiency electrochemical reduction of CO2 beyond the two-electron transfer pathway on grain boundary rich ultra-small SnO2 nanoparticles

2018 ◽  
Vol 6 (22) ◽  
pp. 10313-10319 ◽  
Author(s):  
Chenglu Liang ◽  
Byoungsu Kim ◽  
Shize Yang ◽  
Yang Liu Yang Liu ◽  
Cristiano Francisco Woellner ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Grain Boundary ◽  
Electrochemical Reduction ◽  
High Efficiency ◽  
Sno2 Nanoparticles ◽  
Electron Transfer Pathway ◽  
Reduction Of Co2

Grain boundary rich ultra-small SnO2 nanoparticles exhibited high total FEs towards electrochemical reduction of CO2 with products beyond CO and HCOO−.

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