Cobalt-Oxide-Based Materials as Water Oxidation Catalyst: Recent Progress and Challenges

ACS Catalysis ◽  
2014 ◽  
Vol 4 (10) ◽  
pp. 3701-3714 ◽  
Author(s):  
Xiaohui Deng ◽  
Harun Tüysüz
Keyword(s):  
Cobalt Oxide ◽  
Water Oxidation ◽  
Recent Progress ◽  
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 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.

Electrosynthesis of Highly Transparent Cobalt Oxide Water Oxidation Catalyst Films from Cobalt Aminopolycarboxylate Complexes

ChemSusChem ◽  
2015 ◽  
Vol 8 (8) ◽  
pp. 1394-1403 ◽  
Author(s):  
Shannon A. Bonke ◽  
Mathias Wiechen ◽  
Rosalie K. Hocking ◽  
Xi-Ya Fang ◽  
David W. Lupton ◽  
...  
Keyword(s):  
Cobalt Oxide ◽  
Water Oxidation ◽  
Oxidation Catalyst

Electrochemical and photoelectrochemical water splitting with a CoOx catalyst prepared by flame assisted deposition

2020 ◽  
Vol 49 (3) ◽  
pp. 588-592 ◽  
Author(s):  
Fusheng Li ◽  
Ziqi Zhao ◽  
Hao Yang ◽  
Dinghua Zhou ◽  
Yilong Zhao ◽  
...  
Keyword(s):  
Cobalt Oxide ◽  
Water Splitting ◽  
Water Oxidation ◽  
Oxide Catalyst ◽  
Photoelectrochemical Water Splitting ◽  
Deposition Method ◽  
Photoelectrochemical Water Oxidation

A cobalt oxide catalyst prepared by a flame-assisted deposition method on the surface of FTO and hematite for electrochemical and photoelectrochemical water oxidation, respectively.

Water Oxidation Catalyst via Heterogenization of Iridium Oxides on Silica: A Polyamine-Mediated Route To Achieve Activity and Stability

ACS Catalysis ◽  
2016 ◽  
Vol 6 (9) ◽  
pp. 5699-5705 ◽  
Author(s):  
Nagaraju Shilpa ◽  
Joydeb Manna ◽  
Parasmani Rajput ◽  
Rohit Kumar Rana
Keyword(s):  
Water Oxidation ◽  
Oxidation Catalyst ◽  
Iridium Oxides

Synthesis of nanostructuredβ-Ni(OH)2by electrochemical dissolution–precipitation and its application as a water oxidation catalyst

2016 ◽  
Vol 27 (27) ◽  
pp. 275401 ◽  
Author(s):  
Sang Cheol Jung ◽  
Soong Leong Sim ◽  
Ying Woan Soon ◽  
Chee Ming Lim ◽  
Peter Hing ◽  
...  
Keyword(s):  
Water Oxidation ◽  
Oxidation Catalyst ◽  
Electrochemical Dissolution
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