Electrochemical reduction of carbon monoxide in the titanium(III)-molybdenum(III)-pyrocatechol system in aqueous alkaline solutions

1983 ◽  
Vol 32 (9) ◽  
pp. 1843-1847 ◽  
Author(s):  
G. N. Petrova ◽  
O. N. Efimov ◽  
V. V. Strelets
Keyword(s):  
Carbon Monoxide ◽  
Electrochemical Reduction ◽  
Alkaline Solutions

Clam-shaped cyclam-functionalized porphyrin for electrochemical reduction of carbon dioxide

2019 ◽  
Vol 23 (04n05) ◽  
pp. 453-461
Author(s):  
Sumana Tawil ◽  
Hathaichanok Seelajaroen ◽  
Amorn Petsom ◽  
Niyazi Serdar Sariciftci ◽  
Patchanita Thamyongkit
Keyword(s):  
Carbon Dioxide ◽  
Carbon Monoxide ◽  
Cyclic Voltammetry ◽  
Catalytic Activity ◽  
Electrochemical Reduction ◽  
Target Compound ◽  
Faradaic Efficiency ◽  
Controlled Potential Electrolysis ◽  
Improved Stability ◽  
Controlled Potential

A clam-shaped molecule comprising a Zn(II)-porphyrin and a Zn(II)-cyclam is synthesized and characterized. Its electrochemical behavior and catalytic activity for homogeneous electrochemical reduction of carbon dioxide (CO[Formula: see text] are investigated by cyclic voltammetry and compared with those of Zn(II)-meso-tetraphenylporphyrin and Zn(II)-cyclam. Under N2-saturated conditions, cyclic voltammetry of the featured complex has characteristics of its two constituents, but under CO2-saturated conditions, the target compound exhibits significant current enhancement. Iterative reduction under electrochemical conditions indicated the target compound has improved stability relative to Zn(II)-cyclam. Controlled potential electrolysis demonstrates that, without addition of water, methane (CH[Formula: see text] is the only detectable product with 1% Faradaic efficiency (FE). The formation of CH4 is not observed under the catalysis of the Zn(II)-porphyrin benchmark compound, indicating that the CO2-capturing function of the Zn(II)-cyclam unit contributes to the catalysis. Upon addition of 3% v/v water, the electrochemical reduction of CO2 in the presence of the target compound gives carbon monoxide (CO) with 28% FE. Dominance of CO formation under these conditions suggests enhancement of proton-coupled reduction. Integrated action of these Zn(II)-porphyrin and Zn(II)-cyclam units offers a notable example of a molecular catalytic system where the cyclam ring captures and brings CO2 into the proximity of the porphyrin catalysis center.

Electrochemical Reduction of Carbon Dioxide to Carbon Monoxide Using CVD N-Doped Graphene on Copper Foam As Carbo-/Electro-Catalyst

2020 ◽  
Vol MA2020-01 (5) ◽  
pp. 615-615
Author(s):  
Krisara Srimanon ◽  
Atiweena Krittayavathananon ◽  
Sangchai Sarawutanukul ◽  
Montree Sawangphruk
Keyword(s):  
Carbon Dioxide ◽  
Carbon Monoxide ◽  
Electrochemical Reduction ◽  
Copper Foam ◽  
Doped Graphene

Electrochemical Reduction of Solid Lead and Antimony Sulfides in Strong Alkaline Solutions

2019 ◽  
Vol 166 (2) ◽  
pp. E62-E67 ◽  
Author(s):  
Jiakang Qu ◽  
Xianyang Li ◽  
Hongwei Xie ◽  
Zhiqiang Ning ◽  
Qiushi Song ◽  
...  
Keyword(s):  
Electrochemical Reduction ◽  
Alkaline Solutions

Study of lepidocrocite γ-FeOOH electrochemical reduction in neutral and slightly alkaline solutions at 25°C

2005 ◽  
Vol 51 (4) ◽  
pp. 745-753 ◽  
Author(s):  
H. Antony ◽  
L. Legrand ◽  
L. Maréchal ◽  
S. Perrin ◽  
Ph. Dillmann ◽  
...  
Keyword(s):  
Electrochemical Reduction ◽  
Alkaline Solutions

Manganese Dioxides: Structural Model and In-Situ Neutron Powder Diffraction Investigation of Thermal Annealing and Electrochemical Reduction

1990 ◽  
Vol 210 ◽  
Author(s):  
M. Ripert ◽  
J. Pannetier ◽  
Y. Chabre ◽  
C. Poinsignon
Keyword(s):  
Electrochemical Reduction ◽  
Thermal Annealing ◽  
Powder Diffraction ◽  
Structural Model ◽  
Neutron Powder Diffraction ◽  
Alkaline Solutions ◽  
Structural Description ◽  
Thermally Induced ◽  
Three Stages

AbstractStarting from the seminal work of De Wolff [1], we have developed a structural description, based on two kinds of defects, which accounts for the scattering function of all γand ε-MnO2. Using numerical simulation results, we propose simple methods to estimate the parameters which characterize real manganese dioxide samples. Real time neutron powder diffraction has been used to investigate in situ the transformations undergone by γ-MnO2 during thermal annealing and electrochemical reduction in alkaline solutions. We have found that thermally induced transformation from MnO2 to ∝-Mn2O3 can involve up to seven different steps and that electrochemical reduction of γ-MnO2 in KOD electrolyte proceeds through three stages, the final one leading in most cases to a breakdown of the initial crystal lattice.

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