A facile method for the synthesis of a porous cobalt oxide–carbon hybrid as a highly efficient water oxidation catalyst

2016 ◽  
Vol 4 (5) ◽  
pp. 1819-1827 ◽  
Author(s):  
Mei Zhang ◽  
Yong-Liang Huang ◽  
Jia-Wei Wang ◽  
Tong-Bu Lu
Keyword(s):  
Catalytic Activity ◽  
Cobalt Oxide ◽  
Water Oxidation ◽  
Oxidation Catalyst ◽  
Highly Efficient

A cobalt oxide–carbon hybrid was synthesized, which exhibited outstanding chemical, photochemical and electrochemical water oxidation catalytic activity.

Rutile TiO2 single crystals delivering enhanced photocatalytic oxygen evolution performance

Nanoscale ◽  
2021 ◽  
Author(s):  
Bing Fu ◽  
Zhijiao Wu ◽  
Kai Guo ◽  
Lingyu Piao
Keyword(s):  
Catalytic Activity ◽  
Single Crystals ◽  
Oxygen Evolution ◽  
Water Oxidation ◽  
Charge Separation ◽  
High Surface ◽  
Rutile Tio2 ◽  
Highly Efficient ◽  
Photogenerated Charge Separation

Owing to their scientific and technological importance, the development of highly efficient photocatalytic water oxidation systems with rapid photogenerated charge separation and high surface catalytic activity has highly desirable for...

Rearranging from 6- to 7-coordination initiates the catalytic activity: An EPR study on a Ru-bda water oxidation catalyst

2017 ◽  
Vol 346 ◽  
pp. 206-215 ◽  
Author(s):  
Quentin Daniel ◽  
Ping Huang ◽  
Ting Fan ◽  
Ying Wang ◽  
Lele Duan ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Water Oxidation ◽  
Oxidation Catalyst

scholarly journals In Situ EPR Characterization of a Cobalt Oxide Water Oxidation Catalyst at Neutral pH

Catalysts ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 926 ◽  
Author(s):  
Yury Kutin ◽  
Nicholas Cox ◽  
Wolfgang Lubitz ◽  
Alexander Schnegg ◽  
Olaf Rüdiger
Keyword(s):  
Cobalt Oxide ◽  
Water Oxidation ◽  
Large Scale ◽  
Low Cost ◽  
Operating Conditions ◽  
Oxidation Catalyst ◽  
O2 Evolution ◽  
Ligand Field ◽  
Neutral Ph

Here we report an in situ electron paramagnetic resonance (EPR) study of a low-cost, high-stability cobalt oxide electrodeposited material (Co-Pi) that oxidizes water at neutral pH and low over-potential, representing a promising system for future large-scale water splitting applications. Using CW X-band EPR we can follow the film formation from a Co(NO3)2 solution in phosphate buffer and quantify Co uptake into the catalytic film. As deposited, the film shows predominantly a Co(II) EPR signal, which converts into a Co(IV) signal as the electrode potential is increased. A purpose-built spectroelectrochemical cell allowed us to quantify the extent of Co(II) to Co(IV) conversion as a function of potential bias under operating conditions. Consistent with its role as an intermediate, Co(IV) is formed at potentials commensurate with electrocatalytic O2 evolution (+1.2 V, vs. SHE). The EPR resonance position of the Co(IV) species shifts to higher fields as the potential is increased above 1.2 V. Such a shift of the Co(IV) signal may be assigned to changes in the local Co structure, displaying a more distorted ligand field or more ligand radical character, suggesting it is this subset of sites that represents the catalytically ‘active’ component. The described spectroelectrochemical approach provides new information on catalyst function and reaction pathways of water oxidation.

Concentrated-acid triggered superfast generation of porous amorphous cobalt oxide toward efficient water oxidation catalysis in alkaline solution

2019 ◽  
Vol 55 (12) ◽  
pp. 1797-1800 ◽  
Author(s):  
Xuqiang Ji ◽  
Yujia He ◽  
Jingquan Liu
Keyword(s):  
Cobalt Oxide ◽  
Alkaline Solution ◽  
Water Oxidation ◽  
Oxidation Catalysis ◽  
Oxidation Catalyst ◽  
Carbon Cloth ◽  
Water Oxidation Catalysis

Amorphous cobalt oxide on carbon cloth (AMO-CoO/CC) was prepared as an excellent water-oxidation catalyst with 50 mV less overpotential at 10 mA cm−2 than highly-crystallized Co3O4 in 1.0 M KOH.

A porphyrin-stabilized iridium oxide water oxidation catalyst

2011 ◽  
Vol 89 (2) ◽  
pp. 152-157 ◽  
Author(s):  
Benjamin D. Sherman ◽  
Smitha Pillai ◽  
Gerdenis Kodis ◽  
Jesse Bergkamp ◽  
Thomas E. Mallouk ◽  
...  
Keyword(s):  
Cyclic Voltammetry ◽  
Catalytic Activity ◽  
Strong Interaction ◽  
Water Oxidation ◽  
Iridium Oxide ◽  
Oxidation Catalyst ◽  
Porphyrin Ring ◽  
Oxygen Quenching ◽  
Applied Potential ◽  
Colloidal Solutions

Colloidal solutions of iridium oxide hydrate (IrO2·nH2O) were formed using porphyrin stabilizers bearing malonate-like functional groups at each of the four meso positions of the porphyrin ring. Cyclic voltammetry and monitoring of solution oxygen concentrations under constant applied potential demonstrated the electrochemical catalytic activity of the porphyrin–IrO2·nH2O complexes for the oxidation of water to oxygen. Quenching of the porphyrin fluorescence in the complex implies strong interaction between the porphyrin and the IrO2·nH2O. These results mark a step toward developing a porphyrin-based photoanode for use in a photoelectrochemical water-splitting cell.

scholarly journals Visible light-driven water oxidation using a covalently-linked molecular catalyst–sensitizer dyad assembled on a TiO2 electrode

2016 ◽  
Vol 7 (2) ◽  
pp. 1430-1439 ◽  
Author(s):  
Masanori Yamamoto ◽  
Lei Wang ◽  
Fusheng Li ◽  
Takashi Fukushima ◽  
Koji Tanaka ◽  
...  
Keyword(s):  
Visible Light ◽  
Water Oxidation ◽  
Ruthenium Complex ◽  
Oxidation Catalyst ◽  
Tio2 Electrode ◽  
Molecular Catalyst ◽  
Highly Efficient ◽  
Visible Light Driven ◽  
Artificial Photosynthetic ◽  
Covalently Linked

The combination of porphyrin as a sensitizer and a ruthenium complex as a water oxidation catalyst (WOC) is promising to exploit highly efficient molecular artificial photosynthetic systems.

Highly efficient and robust molecular water oxidation catalysts based on ruthenium complexes

2014 ◽  
Vol 50 (85) ◽  
pp. 12947-12950 ◽  
Author(s):  
Lei Wang ◽  
Lele Duan ◽  
Ying Wang ◽  
Mårten S. G. Ahlquist ◽  
Licheng Sun
Keyword(s):  
Catalytic Activity ◽  
Dicarboxylic Acid ◽  
Water Oxidation ◽  
Ruthenium Complexes ◽  
Molecular Water ◽  
Oxidation Catalysts ◽  
Turnover Number ◽  
High Turnover ◽  
Molecular Catalyst ◽  
Highly Efficient

The molecular catalyst Ru(bda)L2 (H2bda = 2,2′-bipyridine-6,6′-dicarboxylic acid, L = 6-bromophthalazine) shows excellent catalytic activity for water oxidation. By using Ce(NH4)2(NO3)6 as an oxidant, the catalyst reached a high turnover number TON = 100 000 in 3 hours.

scholarly journals CoOx nanoparticle anchored on sulfonated-graphite as efficient water oxidation catalyst

2017 ◽  
Vol 8 (9) ◽  
pp. 6111-6116 ◽  
Author(s):  
Jingqi Guan ◽  
Chunmei Ding ◽  
Ruotian Chen ◽  
Baokun Huang ◽  
Xianwen Zhang ◽  
...  
Keyword(s):  
Water Oxidation ◽  
Oxidation Catalyst ◽  
Oxidation Activity ◽  
Solar Water ◽  
Highly Efficient ◽  
Solar Water Oxidation

Ultrasmall CoOx nanoparticles on sulfonated graphite exhibit highly efficient water oxidation activity and can be used for electrochemical and solar water oxidation.

Synthesis and Demonstration of Subnanometric Iridium Oxide as Highly Efficient and Robust Water Oxidation Catalyst

ACS Catalysis ◽  
2017 ◽  
Vol 7 (9) ◽  
pp. 5983-5986 ◽  
Author(s):  
Jingqi Guan ◽  
Deng Li ◽  
Rui Si ◽  
Shu Miao ◽  
Fuxiang Zhang ◽  
...  
Keyword(s):  
Water Oxidation ◽  
Iridium Oxide ◽  
Oxidation Catalyst ◽  
Highly Efficient
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