A Bio-inspired Cu4 O4 Cubane: Effective Molecular Catalysts for Electrocatalytic Water Oxidation in Aqueous Solution

2018 ◽  
Vol 130 (26) ◽  
pp. 7976-7980 ◽  
Author(s):  
Xin Jiang ◽  
Jian Li ◽  
Bing Yang ◽  
Xiang-Zhu Wei ◽  
Bo-Wei Dong ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Water Oxidation ◽  
Molecular Catalysts

A Bio-inspired Cu4 O4 Cubane: Effective Molecular Catalysts for Electrocatalytic Water Oxidation in Aqueous Solution

2018 ◽  
Vol 57 (26) ◽  
pp. 7850-7854 ◽  
Author(s):  
Xin Jiang ◽  
Jian Li ◽  
Bing Yang ◽  
Xiang-Zhu Wei ◽  
Bo-Wei Dong ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Water Oxidation ◽  
Molecular Catalysts

scholarly journals Base-enhanced catalytic water oxidation by a carboxylate–bipyridine Ru(II) complex

2015 ◽  
Vol 112 (16) ◽  
pp. 4935-4940 ◽  
Author(s):  
Na Song ◽  
Javier J. Concepcion ◽  
Robert A. Binstead ◽  
Jennifer A. Rudd ◽  
Aaron K. Vannucci ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Proton Transfer ◽  
Water Oxidation ◽  
Proton Acceptor ◽  
Half Time ◽  
X Ray ◽  
X Ray Crystallography ◽  
Buffer Base ◽  
Electron Proton Transfer ◽  
C Nmr

In aqueous solution above pH 2.4 with 4% (vol/vol) CH3CN, the complex [RuII(bda)(isoq)2] (bda is 2,2′-bipyridine-6,6′-dicarboxylate; isoq is isoquinoline) exists as the open-arm chelate, [RuII(CO2-bpy-CO2−)(isoq)2(NCCH3)], as shown by 1H and 13C-NMR, X-ray crystallography, and pH titrations. Rates of water oxidation with the open-arm chelate are remarkably enhanced by added proton acceptor bases, as measured by cyclic voltammetry (CV). In 1.0 M PO43–, the calculated half-time for water oxidation is ∼7 μs. The key to the rate accelerations with added bases is direct involvement of the buffer base in either atom–proton transfer (APT) or concerted electron–proton transfer (EPT) pathways.

Oxygen evolution from water oxidation on molecular catalysts confined in the nanocages of mesoporous silicas

2012 ◽  
Vol 5 (8) ◽  
pp. 8229 ◽  
Author(s):  
Bo Li ◽  
Fei Li ◽  
Shiyang Bai ◽  
Zhijun Wang ◽  
Licheng Sun ◽  
...  
Keyword(s):  
Oxygen Evolution ◽  
Water Oxidation ◽  
Mesoporous Silicas ◽  
Molecular Catalysts

scholarly journals Polynuclear Cobalt Complexes as Catalysts for Light-Driven Water Oxidation: A Review of Recent Advances

Catalysts ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 602 ◽  
Author(s):  
Dmytro Nesterov ◽  
Oksana Nesterova
Keyword(s):  
Water Oxidation ◽  
Catalytic Efficiency ◽  
Cobalt Complexes ◽  
Platinum Group Metal ◽  
Experimental Methods ◽  
Cobalt Ions ◽  
Recent Advances ◽  
Wide Range ◽  
Artificial Photosynthetic ◽  
Molecular Catalysts

Photochemical water oxidation, as a half-reaction of water splitting, represents a great challenge towards the construction of artificial photosynthetic systems. Complexes of first-row transition metals have attracted great attention in the last decade due to their pronounced catalytic efficiency in water oxidation, comparable to that exhibited by classical platinum-group metal complexes. Cobalt, being an abundant and relatively cheap metal, has rich coordination chemistry allowing construction of a wide range of polynuclear architectures for the catalytic purposes. This review covers recent advances in application of cobalt complexes as (pre)catalysts for water oxidation in the model catalytic system comprising [Ru(bpy)3]2+ as a photosensitizer and S2O82− as a sacrificial electron acceptor. The catalytic parameters are summarized and discussed in view of the structures of the catalysts. Special attention is paid to the degradation of molecular catalysts under catalytic conditions and the experimental methods and techniques used to control their degradation as well as the leaching of cobalt ions.

Mechanisms of water oxidation using ruthenium, cobalt, copper, and iron molecular catalysts

2019 ◽  
pp. 197-240 ◽  
Author(s):  
Alexander Rene Parent ◽  
Takashi Nakazono ◽  
Yuta Tsubonouchi ◽  
Natsuki Taira ◽  
Ken Sakai
Keyword(s):  
Water Oxidation ◽  
Molecular Catalysts ◽  
Cobalt Copper

scholarly journals Stabilization of a molecular water oxidation catalyst on a dye−sensitized photoanode by a pyridyl anchor

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Yong Zhu ◽  
Degao Wang ◽  
Qing Huang ◽  
Jian Du ◽  
Licheng Sun ◽  
...  
Keyword(s):  
Water Splitting ◽  
Phosphonic Acid ◽  
Water Oxidation ◽  
Oxidation Catalyst ◽  
Molecular Water ◽  
Applied Bias ◽  
Surface Loading ◽  
Dye Sensitized ◽  
Monomeric Structure ◽  
Molecular Catalysts

Abstract Understanding and controlling the properties of water-splitting assemblies in dye-sensitized photoelectrosynthesis cells is a key to the exploitation of their properties. We demonstrate here that, following surface loading of a [Ru(bpy)3]2+ (bpy = 2,2′-bipyridine) chromophore on nanoparticle electrodes, addition of the molecular catalysts, Ru(bda)(L)2 (bda  =  2,2′-bipyridine-6,6′-dicarboxylate) with phosphonate or pyridyl sites for water oxidation, gives surfaces with a 5:1 chromophore to catalyst ratio. Addition of the surface-bound phosphonate derivatives with L = 4-pyridyl phosphonic acid or diethyl 3-(pyridin-4-yloxy)decyl-phosphonic acid, leads to well-defined surfaces but, following oxidation to Ru(III), they undergo facile, on-surface dimerization to give surface-bound, oxo-bridged dimers. The dimers have a diminished reactivity toward water oxidation compared to related monomers in solution. By contrast, immobilization of the Ru-bda catalyst on TiO2 with the 4,4′-dipyridyl anchoring ligand can maintain the monomeric structure of catalyst and gives relatively stable photoanodes with photocurrents that reach to 1.7 mA cm−2 with an optimized, applied bias photon-to-current efficiency of 1.5%.

scholarly journals Multi-Electron-Transfer Catalysts Needed for Artificial Photosynthesis

2012 ◽  
Vol 1387 ◽  
Author(s):  
James Vickers ◽  
Hongjin Lv ◽  
Petro F. Zhuk ◽  
Yurii V. Geletii ◽  
Craig L. Hill
Keyword(s):  
Experimental Data ◽  
Aqueous Solution ◽  
Electron Transfer ◽  
Catalytic Activity ◽  
Induction Period ◽  
Water Oxidation ◽  
Fuel Production ◽  
Oxygen Ligand ◽  
Visible Light Driven ◽  
Simple Kinetic Model

ABSTRACTWe report a study on catalytic water oxidation by cobalt in oxygen ligand environments because such systems are as promising as any in the water oxidation component of solar fuel production. We have re-examined the catalytic activity of Co(II) in aqueous solution using either [Ru(bpy)3]3+ as a stoichiometric oxidant or in visible-light-driven reactions with persulfate as a sacrificial electron acceptor. In both systems a distinctive induction period is observed. A simple kinetic model is proposed that describes the experimental data well. The presence of an induction period is explained by relatively slow formation of the true catalyst from aquacobalt(II).

ChemInform Abstract: Polyoxometalate-Based Cobalt-Phosphate Molecular Catalysts for Visible Light-Driven Water Oxidation.

ChemInform ◽  
2014 ◽  
Vol 45 (31) ◽  
pp. no-no
Author(s):  
Xin-Bao Han ◽  
Zhi-Ming Zhang ◽  
Teng Zhang ◽  
Yang-Guang Li ◽  
Wenbin Lin ◽  
...  
Keyword(s):  
Visible Light ◽  
Water Oxidation ◽  
Visible Light Driven ◽  
Cobalt Phosphate ◽  
Molecular Catalysts

Fast and Simple Preparation of Iron-Based Thin Films as Highly Efficient Water-Oxidation Catalysts in Neutral Aqueous Solution

2015 ◽  
Vol 127 (16) ◽  
pp. 4952-4957 ◽  
Author(s):  
Yizhen Wu ◽  
Mingxing Chen ◽  
Yongzhen Han ◽  
Hongxia Luo ◽  
Xiaojun Su ◽  
...  
Keyword(s):  
Thin Films ◽  
Aqueous Solution ◽  
Water Oxidation ◽  
Oxidation Catalysts ◽  
Highly Efficient ◽  
Simple Preparation ◽  
Neutral Aqueous Solution ◽  
Iron Based
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