Enhancing Electrochemical CO2 Reduction Activity via Charge Transfer and sp-Band Filling in a Au Thin Layer on Ag

2020 ◽  
Vol 3 (10) ◽  
pp. 9792-9798
Author(s):  
Wen Guo ◽  
Kyubin Shim ◽  
Sang-Mun Jung ◽  
Hye Su Kang ◽  
Yong-Tae Kim
Keyword(s):  
Charge Transfer ◽  
Thin Layer ◽  
Co2 Reduction ◽  
Reduction Activity ◽  
Electrochemical Co2 Reduction ◽  
Band Filling

Effect of Surface Reforming via O3 Treatment on the Electrochemical CO2 Reduction Activity of a Ag Cathode

2020 ◽  
Vol 3 (7) ◽  
pp. 6552-6560
Author(s):  
Masaatsu Ishida ◽  
Soichi Kikkawa ◽  
Kazutaka Hori ◽  
Kentaro Teramura ◽  
Hiroyuki Asakura ◽  
...  
Keyword(s):  
Co2 Reduction ◽  
Reduction Activity ◽  
Electrochemical Co2 Reduction ◽  
Effect Of Surface

Electrochemical CO2 reduction with low overpotential by a poly(4-vinylpyridine) electrode for application to artificial photosynthesis

2017 ◽  
Vol 198 ◽  
pp. 409-418 ◽  
Author(s):  
Hohyun Jeong ◽  
Myung Jong Kang ◽  
Hyeyeong Jung ◽  
Young Soo Kang
Keyword(s):  
Charge Transfer ◽  
Current Density ◽  
Electrochemical Impedance ◽  
Catalytic Properties ◽  
Co2 Reduction ◽  
Surface Concentration ◽  
Reduction Reaction ◽  
Pt Electrodes ◽  
Electrochemical Co2 Reduction ◽  
Low Overpotential

Pyridine molecules have been used as a catalyst to reduce the activation energy of the CO2 reduction reaction. It has been reported that CO2 is reduced by pyridine catalysts at low overpotential around −0.58 V vs. SCE. Poly(4-vinylpyridine), which has pyridine functional groups shows similar catalytic properties to reduce CO2 at low overpotential like pyridinium catalysts. Different thickness of P(4-VP) coated Pt electrodes were analyzed to determine the catalytic properties for CO2 reduction. Cyclic voltammetry, chronoamperometry and electrochemical impedance spectroscopy methods showed the catalytic CO2 reduction properties of a P(4-VP)/Pt electrode. Thin P(4-VP)/Pt film showed a low current density of −0.16 mA cm−2 under CO2 atmosphere and the current density reached −0.45 mA cm−2 with increase of the P(4-VP) thickness. The increase of current density was explained by an increased surface concentration of adsorbed pyridinium groups of the thick P(4-VP) layer. Nyquist plots also showed decrease of impedance with increase of the P(4-VP) layer indicating fast charge transfer between Pt and the P(4-VP) layer due to the increase of hybrid ionic complex formation on the Pt surface. However, charge transfer is restricted when the P(4-VP) layer becomes more thick because of slowed protonation of pyridine groups adjacent to the Pt surface due to the suppressed permeability of electrolyte solution into the PVP membrane. This electrochemical observation provides a new aspect of P(4-VP) polymer for CO2 reduction.

scholarly journals Operando Synthesis of High-Curvature Copper Thin Films for CO2 Electroreduction

Materials ◽  
2019 ◽  
Vol 12 (4) ◽  
pp. 602
Author(s):  
Xin Zhao ◽  
Minshu Du ◽  
Feng Liu
Keyword(s):  
Flow Rate ◽  
Co2 Reduction ◽  
Product Distribution ◽  
Reconstruction Process ◽  
Time Activity ◽  
Reduction Activity ◽  
Electrochemical Co2 Reduction ◽  
Co2 Electroreduction ◽  
Co2 Flow ◽  
Surface Morphology Modification

As the sole metal that could reduce CO2 to substantial amounts of hydrocarbons, Cu plays an important role in electrochemical CO2 reduction, despite its low energy efficiency. Surface morphology modification is an effective method to improve its reaction activity and selectivity. Different from the pretreated modification method, in which the catalysts self-reconstruction process was ignored, we present operando synthesis by simultaneous electro-dissolution and electro-redeposition of copper during the CO2 electroreduction process. Through controlling the cathodic potential and CO2 flow rate, various high-curvature morphologies including microclusters, microspheres, nanoneedles, and nanowhiskers have been obtained, for which the real-time activity and product distribution is analyzed. The best CO2 electro-reduction activity and favored C2H4 generation activity, with around 10% faradic efficiency, can be realized through extensively distributed copper nanowhiskers synthesized under 40 mL/min flow rate and −2.1 V potential.

scholarly journals Trace Levels of Copper in Carbon Materials Show Significant Electrochemical CO2 Reduction Activity

ACS Catalysis ◽  
2015 ◽  
Vol 6 (1) ◽  
pp. 202-209 ◽  
Author(s):  
Yanwei Lum ◽  
Youngkook Kwon ◽  
Peter Lobaccaro ◽  
Le Chen ◽  
Ezra Lee Clark ◽  
...  
Keyword(s):  
Carbon Materials ◽  
Co2 Reduction ◽  
Reduction Activity ◽  
Electrochemical Co2 Reduction

scholarly journals Dipole Field Interactions Determine the CO2 Reduction Activity of 2D FeNC Single Atom Catalysts

2020 ◽  
Author(s):  
Sudarshan Vijay ◽  
Joseph Gauthier ◽  
Hendrik Heenen ◽  
Vanessa Jane Bukas ◽  
Henrik Høgh Kristoffersen ◽  
...  
Keyword(s):  
Rational Design ◽  
Design Principle ◽  
Ph Dependence ◽  
Co2 Reduction ◽  
Catalyst Design ◽  
Single Atom ◽  
Reduction Activity ◽  
Electrochemical Co2 Reduction ◽  
Doped Graphene ◽  
Fuels And Chemicals

<p>Electrochemical CO2 Reduction (CO2R) can potentially allow for the sustainable production of valuable fuels and chemicals. Recently, single atom catalysts on a 2D support have been shown to be a promising catalyst candidate. Using state-of-the-art methods, we develop a model for Fe doped graphene which rationalises several critical experimental observations: the contentious origin of the pH dependence of reactivity and the dependence of current-potential relationships on active site. We show that single atom catalysts have the unique ability to stabilise different dipoles associated with critical reaction intermediates, which translates to significant shifts in activity. This provides a new rational design principle and paves the way for rigorous computation-guided catalyst design of new single atom catalysts for CO2R.</p>

scholarly journals Dipole Field Interactions Determine the CO2 Reduction Activity of 2D FeNC Single Atom Catalysts

2020 ◽  
Author(s):  
Sudarshan Vijay ◽  
Joseph Gauthier ◽  
Hendrik Heenen ◽  
Vanessa Jane Bukas ◽  
Henrik Høgh Kristoffersen ◽  
...  
Keyword(s):  
Rational Design ◽  
Design Principle ◽  
Ph Dependence ◽  
Co2 Reduction ◽  
Catalyst Design ◽  
Single Atom ◽  
Reduction Activity ◽  
Electrochemical Co2 Reduction ◽  
Doped Graphene ◽  
Fuels And Chemicals

<p>Electrochemical CO2 Reduction (CO2R) can potentially allow for the sustainable production of valuable fuels and chemicals. Recently, single atom catalysts on a 2D support have been shown to be a promising catalyst candidate. Using state-of-the-art methods, we develop a model for Fe doped graphene which rationalises several critical experimental observations: the contentious origin of the pH dependence of reactivity and the dependence of current-potential relationships on active site. We show that single atom catalysts have the unique ability to stabilise different dipoles associated with critical reaction intermediates, which translates to significant shifts in activity. This provides a new rational design principle and paves the way for rigorous computation-guided catalyst design of new single atom catalysts for CO2R.</p>

scholarly journals Dipole Field Interactions Determine the CO2 Reduction Activity of 2D FeNC Single Atom Catalysts

2020 ◽  
Author(s):  
Sudarshan Vijay ◽  
Joseph Gauthier ◽  
Hendrik Heenen ◽  
Vanessa Jane Bukas ◽  
Henrik Høgh Kristoffersen ◽  
...  
Keyword(s):  
Rational Design ◽  
Design Principle ◽  
Ph Dependence ◽  
Co2 Reduction ◽  
Catalyst Design ◽  
Single Atom ◽  
Reduction Activity ◽  
Electrochemical Co2 Reduction ◽  
Doped Graphene ◽  
Fuels And Chemicals

<p>Electrochemical CO2 Reduction (CO2R) can potentially allow for the sustainable production of valuable fuels and chemicals. Recently, single atom catalysts on a 2D support have been shown to be a promising catalyst candidate. Using state-of-the-art methods, we develop a model for Fe doped graphene which rationalises several critical experimental observations: the contentious origin of the pH dependence of reactivity and the dependence of current-potential relationships on active site. We show that single atom catalysts have the unique ability to stabilise different dipoles associated with critical reaction intermediates, which translates to significant shifts in activity. This provides a new rational design principle and paves the way for rigorous computation-guided catalyst design of new single atom catalysts for CO2R.</p>

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