Electrocatalytic water oxidation by copper(ii) complexes containing a tetra- or pentadentate amine-pyridine ligand

2017 ◽  
Vol 53 (31) ◽  
pp. 4374-4377 ◽  
Author(s):  
Junyu Shen ◽  
Mei Wang ◽  
Peili Zhang ◽  
Jian Jiang ◽  
Licheng Sun
Keyword(s):  
Water Oxidation ◽  
Good Stability ◽  
Pyridine Ligand ◽  
Catalytically Active

Two copper(ii) complexes were demonstrated to be catalytically active for electrochemical water oxidation with good stability in pH 11.5 solutions.

scholarly journals Copper Containing Molecular Systems in Electrocatalytic Water Oxidation—Trends and Perspectives

Catalysts ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. 83 ◽  
Author(s):  
Dávid Lukács ◽  
Łukasz Szyrwiel ◽  
József Pap
Keyword(s):  
Thin Films ◽  
Experimental Evidence ◽  
Water Oxidation ◽  
Molecular Design ◽  
Molecular Systems ◽  
Theoretical Approaches ◽  
Catalytically Active ◽  
Number Of Publications ◽  
Molecular Compounds

Molecular design represents an exciting platform to refine mechanistic details of electrocatalytic water oxidation and explore new perspectives. In the growing number of publications some general trends seem to be outlined concerning the operation mechanisms, with the help of experimental and theoretical approaches that have been broadly applied in the case of bioinorganic systems. In this review we focus on bio-inspired Cu-containing complexes that are classified according to the proposed mechanistic pathways and the related experimental evidence, strongly linked to the applied ligand architecture. In addition, we devote special attention to features of molecular compounds, which have been exploited in the efficient fabrication of catalytically active thin films.

Engineering Disorder at a Nanoscale: A Combined TEM and XAS Investigation of Amorphous versus Nanocrystalline Sodium Birnessite

2015 ◽  
Vol 68 (11) ◽  
pp. 1715 ◽  
Author(s):  
Rosalie K. Hocking ◽  
Hannah J. King ◽  
Aimee Hesson ◽  
Shannon A. Bonke ◽  
Bernt Johannessen ◽  
...  
Keyword(s):  
Water Oxidation ◽  
Nanocrystalline Material ◽  
Oxidation Catalysis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Water Oxidation Catalysis ◽  
Catalytically Active ◽  
Amorphous Metal Oxide ◽  
X Ray Absorption

The term amorphous metal oxide is becoming widely used in the catalysis community. The term is generally used when there are no apparent peaks in an X-ray diffraction pattern. However, the absence of such features in X-ray diffraction can mean that the material is either truly amorphous or that it is better described as nanocrystalline. By coprecipitating a sodium birnessite-like phase with and without phosphate (1.5 %), we are able to engineer two very similar but distinct materials – one that is nanocrystalline and the other that is amorphous. The two closely related phases were characterized with both Mn K-edge X-ray absorption spectroscopy and high-resolution transmission electron microscopy. These structural results were then correlated with catalytic and electrocatalytic activities for water oxidation catalysis. In this case, the amorphous phosphate-doped material was less catalytically active than the nanocrystalline material.

Metalloporphyrin immobilized CeO2: in situ generation of active sites and synergistic promotion of photocatalytic water oxidation

2021 ◽  
Author(s):  
Jiao Meng ◽  
Yue Zhao ◽  
Haining Li ◽  
Ruiping Chen ◽  
Xun Sun ◽  
...  
Keyword(s):  
Water Oxidation ◽  
Active Sites ◽  
Oxygen Vacancies ◽  
Electron Coupling ◽  
Catalytically Active ◽  
In Situ Generation ◽  
The Creation

CoTCPP transfer photoexcited electrons to CeO2 by d–f electron coupling. The in situ generation of catalytically active sites: reduction on CeO2 accompanied with the creation of oxygen vacancies and oxidation on CoTCPP that transforms into CoOOH.

scholarly journals The Positive Effect of Iron Doping in the Electrocatalytic Activity of Cobalt Hexacyanoferrate

Catalysts ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 130 ◽  
Author(s):  
Lijuan Han ◽  
José Ramón Galán-Mascarós
Keyword(s):  
Transition Metal Oxides ◽  
Water Oxidation ◽  
Partial Substitution ◽  
Electrolytic Hydrogen ◽  
Cobalt Hexacyanoferrate ◽  
Catalytically Active ◽  
Earth Abundant ◽  
Major Bottleneck ◽  
Current Densities ◽  
Ph Range

The lack of an earth-abundant, robust, and fast electrocatalyst for the oxygen evolution reaction (water oxidation) is a major bottleneck for the development of an scalable scheme towards the production of electrolytic hydrogen and other synthetic fuels from renewable energy and natural feedstocks. While many transition metal oxides work reasonably well in basic media, very few alternatives are available in neutral or acidic media. One promising candidate comes from the Prussian blue family, cobalt hexacyanoferrate. This electrocatalyst offers robust activity in a large pH range ( 0 < pH < 13 ), although current densities are limited due to slow charge transfer kinetics. Herein, we report how the partial substitution of catalytically active Co centres by additional Fe boosts current densities, reaching over 100 mA/cm 2 , more than double the performance of the parent Co 2 [Fe(CN) 6 ]. Those new results clearly increase the opportunity for this catalyst to become relevant in industrial-ready electrolyser architectures.

A two-dimensional Ni(ii) coordination polymer based on a 3,5-bis(1′,2′,4′-triazol-1′-yl)pyridine ligand for water electro-oxidation

2019 ◽  
Vol 9 (8) ◽  
pp. 1769-1773 ◽  
Author(s):  
Chun-Ling Wang ◽  
Chuan-Qi Song ◽  
Wen-Hui Shen ◽  
Yuan-Yuan Qi ◽  
Ying Xue ◽  
...  
Keyword(s):  
Coordination Polymer ◽  
Water Oxidation ◽  
Two Dimensional ◽  
Pyridine Ligand ◽  
Molecular Catalyst ◽  
Electro Oxidation

A two-dimensional Ni(ii) coordination polymer based on a novel 3,5-bis(1′,2′,4′-triazol-1′-yl)pyridine rigid ligand was proposed as a novel and efficient molecular catalyst for water oxidation.

Ru(ii) water oxidation catalysts with 2,3-bis(2-pyridyl)pyrazine and tris(pyrazolyl)methane ligands: assembly of photo-active and catalytically active subunits in a dinuclear structure

2020 ◽  
Vol 49 (10) ◽  
pp. 3341-3352
Author(s):  
Alice de Palo ◽  
Giuseppina La Ganga ◽  
Francesco Nastasi ◽  
Massimo Guelfi ◽  
Marco Bortoluzzi ◽  
...  
Keyword(s):  
Experimental Study ◽  
Water Molecule ◽  
Coordination Sphere ◽  
Water Oxidation ◽  
Oxidation Catalysts ◽  
Catalytically Active ◽  
Active Subunits ◽  
Dinuclear Structure

A combined DFT and experimental study indicates that one water molecule is allowed to enter the first coordination sphere of a one-site catalyst, thus activating water oxidation.

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