scholarly journals Mitigating Mass Transport Limitations: Hierarchical Nanoporous Gold Flow-Through Electrodes for Electrochemical CO2 Reduction

2021 ◽  
Author(s):  
Zhen Qi ◽  
Steven A Hawks ◽  
Corie Horwood ◽  
Jürgen Biener ◽  
Monika M. Biener
Keyword(s):  
Mass Transport ◽  
Diffusion Rate ◽  
Co2 Reduction ◽  
Reaction Rates ◽  
Nanoporous Gold ◽  
Aqueous Electrolytes ◽  
Low Concentration ◽  
Electrochemical Co2 Reduction ◽  
Flow Through ◽  
And Diffusion

The reaction rates for electrochemical CO2 reduction in aqueous electrolytes can be limited by the low concentration and diffusion rate of the reactant CO2. To overcome this limitation, we fabricated...

Electrochemical CO2 reduction: water/catalyst interface versus polymer/catalyst interface

2021 ◽  
Author(s):  
Yixin Ouyang ◽  
Ye-hui Zhang ◽  
Peter Rice ◽  
Li Shi ◽  
Jinlan Wang ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Aqueous Solution ◽  
Diffusion Coefficients ◽  
Co2 Reduction ◽  
Aqueous Electrolytes ◽  
Electrolytic Cells ◽  
Electrochemical Co2 Reduction ◽  
Polymer Catalyst ◽  
And Diffusion ◽  
Low Solubility

Due to the low solubility and diffusion coefficients of carbon dioxide in aqueous solution, the carbon dioxide electrolytic cells with aqueous electrolytes are difficult to achieve high conversion current density....

Mass Transport Control by Surface Graphene Oxide for Selective CO Production from Electrochemical CO2 Reduction

ACS Catalysis ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 3222-3231 ◽  
Author(s):  
Dang Le Tri Nguyen ◽  
Chan Woo Lee ◽  
Jonggeol Na ◽  
Min-Cheol Kim ◽  
Nguyen Dien Kha Tu ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Mass Transport ◽  
Co2 Reduction ◽  
Electrochemical Co2 Reduction ◽  
Transport Control

Industrial Approach for Direct Electrochemical CO2 Reduction in Aqueous Electrolytes

2019 ◽  
pp. 224-250
Author(s):  
Maximilian Fleischer ◽  
P. Jeanty ◽  
K. Wiesner-Fleischer ◽  
O. Hinrichsen
Keyword(s):  
Co2 Reduction ◽  
Aqueous Electrolytes ◽  
Electrochemical Co2 Reduction

scholarly journals Enhancing Electrocatalytic CO2 Reduction Using a System-Integrated Approach to Catalyst Discovery

2018 ◽  
Author(s):  
Thomas Burdyny ◽  
Wilson A. Smith
Keyword(s):  
Mass Transport ◽  
Electrochemical Cell ◽  
Co2 Reduction ◽  
Integrated Approach ◽  
Reduction Reaction ◽  
Reaction Conditions ◽  
Alkaline Reaction ◽  
Electrochemical Co2 Reduction ◽  
Current Densities ◽  
Co2 Reduction Reaction

The presented modelling results in this article show that electrochemical CO2 reduction performed at commercially-relevant current densities will ultimately lead to locally alkaline reaction conditions regardless of the electrolyte, configuration and reasonable mass transport scenarios. Discussed in detail are the large implications that this result has for the CO2 reduction reaction itself, and the current way in which catalysts are designed and tested in different electrochemical cell architectures.

Electrocatalytic CO2 reduction to ethylene over ZrO2/Cu-Cu2O catalysts in aqueous electrolytes

2022 ◽  
Author(s):  
Pan-Pan Guo ◽  
Zhen-Hong He ◽  
Shao-Yan Yang ◽  
Weitao Wang ◽  
Kuan Wang ◽  
...  
Keyword(s):  
Co2 Reduction ◽  
Reduction Reaction ◽  
Light Olefins ◽  
Aqueous Electrolytes ◽  
Electrochemical Co2 Reduction ◽  
Co2 Reduction Reaction

The conversion of CO2 to C2H4, especially via the electrochemical CO2 reduction reaction (CO2RR), is one of the promising approaches to utilize CO2 and produce important light olefins. Developing efficient...

scholarly journals Testing a Silver Nanowire Catalyst for the Selective CO2 Reduction in a Gas Diffusion Electrode Half-cell Setup Enabling High Mass Transport Conditions

2019 ◽  
Vol 73 (11) ◽  
pp. 922-927 ◽  
Author(s):  
María de Jesús Gálvez-Vázquez ◽  
Shima Alinejad ◽  
Huifang Hu ◽  
Yuhui Hou ◽  
Pavel Moreno-García ◽  
...  
Keyword(s):  
Mass Transport ◽  
Co2 Reduction ◽  
Reaction Rates ◽  
Gas Diffusion ◽  
Reduction Reaction ◽  
Liquid Electrolyte ◽  
Gas Diffusion Electrode ◽  
Silver Nanowire ◽  
High Mass ◽  
Half Cell

In this work, we discuss the application of a gas diffusion electrode (GDE) setup for benchmarking electrocatalysts for the reductive conversion of CO2 (CO2 RR: CO2 reduction reaction). Applying a silver nanowire (Ag-NW) based catalyst, it is demonstrated that in the GDE setup conditions can be reached, which are relevant for the industrial conversion of CO2 to CO. This reaction is part of the so-called 'Rheticus' process that uses the CO for the subsequent production of butanol and hexanol based on a fermentation approach. In contrast to conventional half-cell measurements using a liquid electrolyte, in the GDE setup CO2 RR current densities comparable to technical cells (>100 mA cm–2) are reached without suffering from mass transport limitations of the CO2 reactant gas. The results are of particular importance for designing CO2 RR catalysts exhibiting high faradaic efficiencies towards CO at technological reaction rates.

Molecular Inhibition for Selective CO2 Conversion

2022 ◽  
Author(s):  
Charles Creissen ◽  
José Guillermo Rivera de la Cruz ◽  
Dilan Karapinar ◽  
Dario Taverna ◽  
Moritz Schreiber ◽  
...  
Keyword(s):  
Heterogeneous Catalysts ◽  
Co2 Reduction ◽  
Copper Catalysts ◽  
Reaction Rates ◽  
Product Distribution ◽  
Flow Cell ◽  
Novel Approach ◽  
Electrochemical Co2 Reduction ◽  
Conventional Material ◽  
Formate Production

Electrochemical CO2 reduction presents a sustainable route to the production of chemicals and fuels. Achieving a narrow product distribution with copper catalysts is challenging and conventional material modifications offer limited control over selectivity. Here, we show that the mild cathodic potentials required to reach high currents in an alkaline gas-fed flow cell permits retention of a surface-bound thiol (4-mercaptopyridine), enabling molecule-directed selective formate generation at high reaction rates. Combined experimental and computational results showed that formate production is favoured due to the inhibition of a CO producing pathway caused by destabilising interactions with the anchored molecule. The immobilisation of molecules to inhibit specific carbon-based products therefore offers a novel approach to rationally tune the selectivity of heterogeneous catalysts.

scholarly journals Enhancing Electrocatalytic CO2 Reduction Using a System-Integrated Approach to Catalyst Discovery

2018 ◽  
Author(s):  
Thomas Burdyny ◽  
Wilson A. Smith
Keyword(s):  
Mass Transport ◽  
Electrochemical Cell ◽  
Co2 Reduction ◽  
Integrated Approach ◽  
Reduction Reaction ◽  
Reaction Conditions ◽  
Alkaline Reaction ◽  
Electrochemical Co2 Reduction ◽  
Current Densities ◽  
Co2 Reduction Reaction

The presented modelling results in this article show that electrochemical CO2 reduction performed at commercially-relevant current densities will ultimately lead to locally alkaline reaction conditions regardless of the electrolyte, configuration and reasonable mass transport scenarios. Discussed in detail are the large implications that this result has for the CO2 reduction reaction itself, and the current way in which catalysts are designed and tested in different electrochemical cell architectures.

An NADH-Inspired Redox Mediator Strategy to Promote Second-Sphere Electron and Proton Transfer for Cooperative Electrochemical CO2 Reduction Catalyzed by Iron Porphyrin

2020 ◽  
Author(s):  
Peter T. Smith ◽  
Sophia Weng ◽  
Christopher Chang
Keyword(s):  
Proton Transfer ◽  
Co2 Reduction ◽  
Iron Porphyrin ◽  
Redox Mediators ◽  
Reservoir Properties ◽  
Proton Reduction ◽  
Electrochemical Co2 Reduction ◽  
Starting Point ◽  
Rate Improvement ◽  
Molecular Catalysts

We present a bioinspired strategy for enhancing electrochemical carbon dioxide reduction catalysis by cooperative use of base-metal molecular catalysts with intermolecular second-sphere redox mediators that facilitate both electron and proton transfer. Functional synthetic mimics of the biological redox cofactor NADH, which are electrochemically stable and are capable of mediating both electron and proton transfer, can enhance the activity of an iron porphyrin catalyst for electrochemical reduction of CO<sub>2</sub> to CO, achieving a 13-fold rate improvement without altering the intrinsic high selectivity of this catalyst platform for CO<sub>2</sub> versus proton reduction. Evaluation of a systematic series of NADH analogs and redox-inactive control additives with varying proton and electron reservoir properties reveals that both electron and proton transfer contribute to the observed catalytic enhancements. This work establishes that second-sphere dual control of electron and proton inventories is a viable design strategy for developing more effective electrocatalysts for CO<sub>2</sub> reduction, providing a starting point for broader applications of this approach to other multi-electron, multi-proton transformations.

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