Electrochemical CO2 reduction by a cobalt bipyricorrole complex: decrease of an overpotential value derived from monoanionic ligand character of the porphyrinoid species

2019 ◽  
Vol 55 (4) ◽  
pp. 493-496 ◽  
Author(s):  
Ayumu Ogawa ◽  
Koji Oohora ◽  
Wenting Gu ◽  
Takashi Hayashi
Keyword(s):  
Co2 Reduction ◽  
Electrochemical Co2 Reduction ◽  
Low Overpotential ◽  
Co Reduction

Bipyricorrole serves as a useful monoanionic ligand in a Co-based catalyst for a selective CO2-to-CO reduction with low overpotential.

Selective and Low Overpotential Electrochemical CO2 Reduction to Formate on CuS Decorated CuO Heterostructure

2019 ◽  
Vol 149 (3) ◽  
pp. 860-869 ◽  
Author(s):  
Amaha Woldu Kahsay ◽  
Kassa Belay Ibrahim ◽  
Meng-Che Tsai ◽  
Mulatu Kassie Birhanu ◽  
Soressa Abera Chala ◽  
...  
Keyword(s):  
Co2 Reduction ◽  
Electrochemical Co2 Reduction ◽  
Low Overpotential

Highly dispersed CuFe-nitrogen active sites electrode for synergistic electrochemical CO2 reduction at low overpotential

2020 ◽  
Vol 269 ◽  
pp. 115029
Author(s):  
Fuhuan Wang ◽  
Heping Xie ◽  
Tao Liu ◽  
Yifan Wu ◽  
Bin Chen
Keyword(s):  
Active Sites ◽  
Co2 Reduction ◽  
Electrochemical Co2 Reduction ◽  
Highly Dispersed ◽  
Low Overpotential

Hierarchical Cu pillar electrodes for electrochemical CO2 reduction to formic acid with low overpotential

2016 ◽  
Vol 18 (8) ◽  
pp. 6252-6258 ◽  
Author(s):  
Jaehoon Chung ◽  
Da Hye Won ◽  
Jaekang Koh ◽  
Eun-Hee Kim ◽  
Seong Ihl Woo
Keyword(s):  
Electrochemical Performance ◽  
Formic Acid ◽  
Surface Area ◽  
Co2 Reduction ◽  
Lattice Property ◽  
Cu Pillar ◽  
Electrochemical Co2 Reduction ◽  
Low Overpotential ◽  
Enhanced Electrochemical Performance

Hierarchical Cu pillar electrodes have shown enhanced electrochemical performance for CO2 reduction due to their increased surface area and controlled lattice property.

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 A Short Perspective on Electrochemical CO2 Reduction to CO

2020 ◽  
Vol 74 (6) ◽  
pp. 478-482
Author(s):  
Maxime Tarrago ◽  
Shengfa Ye
Keyword(s):  
Electronic Structure ◽  
Reaction Mechanism ◽  
Catalytic System ◽  
Co2 Reduction ◽  
Short Review ◽  
Product Selectivity ◽  
Electrochemical Co2 Reduction ◽  
Co Reduction

This short review summarizes examples of many homogeneous non-noble catalysts for CO2-to-CO reduction and compares their feasible mechanisms. The focus is to show that elucidating the electronic structure of the catalytic system likely provides better understanding of the reaction mechanism and product selectivity.

Construction of cobalt-copper bimetallic oxide heterogeneous nanotubes for high-efficient and low-overpotential electrochemical CO2 reduction

2021 ◽  
Vol 54 ◽  
pp. 1-6
Author(s):  
Zhong Cheng ◽  
Xiaodeng Wang ◽  
Hengpan Yang ◽  
Xinyao Yu ◽  
Qing Lin ◽  
...  
Keyword(s):  
Co2 Reduction ◽  
Electrochemical Co2 Reduction ◽  
High Efficient ◽  
Low Overpotential ◽  
Cobalt Copper

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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