Tetraaza-macrocyclic cobalt(II) and nickel(II) complexes as electron-transfer agents in the photo(electro)chemical and electrochemical reduction of carbon dioxide

A manganese substituted Anderson type polyoxometalate, [MnMo6O24]9-, tethered with an anthracene photosensitizer was prepared and used as catalyst for CO2 reduction. The polyoxometalate-photosensitizer hybrid complex, obtained by covalent attachment of the sensitizer to only one face of the planar polyoxometalate, was characterized by NMR, IR and mass spectroscopy. Cyclic voltammetry measurements show a catalytic response for the reduction of carbon dioxide, thereby suggesting catalysis at the manganese site on the open face of the polyoxometalate. Controlled potentiometric electrolysis showed the reduction of CO2 to CO with a TOF of ~15 sec-1. Further photochemical reactions showed that the polyoxometalate-anthracene hybrid complex was active for the reduction of CO2 to yield formic acid and/or CO in varying amounts dependent on the reducing agent used. Control experiments showed that the attachment of the photosensitizer to [MnMo6O24]9- is necessary for photocatalysis.<div> </div>

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RuIII(edta) complexes as molecular redox catalysts in chemical and electrochemical reduction of dioxygen and hydrogen peroxide: inner-sphere versus outer-sphere mechanism

RSC Advances ◽

10.1039/d1ra03293c ◽

2021 ◽

Vol 11 (35) ◽

pp. 21359-21366

Author(s):

Debabrata Chatterjee ◽

Marta Chrzanowska ◽

Anna Katafias ◽

Maria Oszajca ◽

Rudi van Eldik

Keyword(s):

Hydrogen Peroxide ◽

Electron Transfer ◽

Electrochemical Reduction ◽

Molecular Oxygen ◽

Outer Sphere ◽

Transfer Processes ◽

Edta Complexes ◽

Inner Sphere ◽

Electron Transfer Processes ◽

Sphere Mechanism

[RuII(edta)(L)]2–, where edta4– =ethylenediaminetetraacetate; L = pyrazine (pz) and H2O, can reduce molecular oxygen sequentially to hydrogen peroxide and further to water by involving both outer-sphere and inner-sphere electron transfer processes.

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Process Parameters in the Electrochemical Reduction of Carbon Dioxide to Ethylene

ChemBioEng Reviews ◽

10.1002/cben.202100004 ◽

2021 ◽

Author(s):

Michael Sturman ◽

Michael Oelgemöller

Keyword(s):

Carbon Dioxide ◽

Electrochemical Reduction ◽

Process Parameters

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Cascade Electrochemical Reduction of Carbon Dioxide with Bimetallic Nanowire and Foam Electrodes

ChemElectroChem ◽

10.1002/celc.202100295 ◽

2021 ◽

Vol 8 (10) ◽

pp. 1918-1924

Author(s):

Benjamin A. Zhang ◽

Daniel G. Nocera

Keyword(s):

Carbon Dioxide ◽

Electrochemical Reduction

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An overview of flow cell architectures design and optimization for electrochemical CO2 reduction

Journal of Materials Chemistry A ◽

10.1039/d1ta06101a ◽

2021 ◽

Author(s):

Dui Ma ◽

Ting Jin ◽

Keyu Xie ◽

Haitao Huang

Keyword(s):

Carbon Dioxide ◽

Global Warming ◽

Electrochemical Reduction ◽

Atmospheric Carbon Dioxide ◽

Co2 Reduction ◽

Value Added ◽

Flow Cell ◽

Design And Optimization ◽

Electrochemical Co2 Reduction ◽

Carbon Dioxide Levels

Converting CO2 into value-added fuels or chemical feedstocks through electrochemical reduction is one of the several promising avenues to reduce atmospheric carbon dioxide levels and alleviate global warming. This approach...

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