Calcium containing iron oxide as an efficient and robust catalyst in (photo-)electrocatalytic water oxidation at neutral pH

2018 ◽  
Vol 2 (1) ◽  
pp. 271-279 ◽  
Author(s):  
Hung-Chun Chiu ◽  
Wei-Hsiang Huang ◽  
Liang-Ching Hsu ◽  
Yan-Gu Lin ◽  
Yi-Hsuan Lai ◽  
...  
Keyword(s):  
Iron Oxide ◽  
High Activity ◽  
Water Oxidation ◽  
Iron Phosphate ◽  
Neutral Ph ◽  
Amorphous Nature

The amorphous nature and in situ formation of iron phosphate render CaFeOx with high activity and stability for the OER at neutral pH.

A cobalt-borate nanosheet array: an efficient and durable non-noble-metal electrocatalyst for water oxidation at near neutral pH

2017 ◽  
Vol 5 (16) ◽  
pp. 7305-7308 ◽  
Author(s):  
Libin Yang ◽  
Danni Liu ◽  
Shuai Hao ◽  
Rongmei Kong ◽  
Abdullah M. Asiri ◽  
...  
Keyword(s):  
High Activity ◽  
Noble Metal ◽  
Current Density ◽  
Water Oxidation ◽  
Catalytic Current ◽  
Neutral Ph ◽  
Nanosheet Array ◽  
Ti Mesh ◽  
Catalyst Electrode

As a durable catalyst electrode, a cobalt-borate nanosheet array on a Ti mesh shows high activity for water oxidation in 0.1 M K-Bi (pH: 9.2), achieving a geometrical catalytic current density of 10 mA cm−2 at an overpotential of 469 mV.

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.

Iron phosphate modified calcium iron oxide as an efficient and robust catalyst in electrocatalyzing oxygen evolution from seawater

2019 ◽  
Vol 215 ◽  
pp. 205-215 ◽  
Author(s):  
Wei-Hsiang Huang ◽  
Chia-Yu Lin
Keyword(s):  
Iron Oxide ◽  
High Activity ◽  
Oxygen Evolution ◽  
Iron Phosphate ◽  
Natural Seawater ◽  
Calcium Iron

CaFeOx modified with electrodeposited FePO4 exhibits high activity and stability in natural seawater splitting.

Capturing Manganese Oxide Intermediates in Electrochemical Water Oxidation at Neutral pH by In Situ Raman Spectroscopy

2021 ◽  
Vol 133 (9) ◽  
pp. 4723-4731
Author(s):  
Kang Hee Cho ◽  
Sunghak Park ◽  
Hongmin Seo ◽  
Seungwoo Choi ◽  
Moo Young Lee ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Manganese Oxide ◽  
Water Oxidation ◽  
In Situ Raman Spectroscopy ◽  
In Situ Raman ◽  
Neutral Ph

Ni-Based Electrocatalyst for Water Oxidation Developed In-Situ in a HCO3−/CO2System at Near-Neutral pH

2014 ◽  
Vol 4 (9) ◽  
pp. 1301929 ◽  
Author(s):  
Khurram Saleem Joya ◽  
Yasir F. Joya ◽  
Huub J. M. de Groot
Keyword(s):  
Water Oxidation ◽  
Neutral Ph

Capturing Manganese Oxide Intermediates in Electrochemical Water Oxidation at Neutral pH by In Situ Raman Spectroscopy

2021 ◽  
Vol 60 (9) ◽  
pp. 4673-4681
Author(s):  
Kang Hee Cho ◽  
Sunghak Park ◽  
Hongmin Seo ◽  
Seungwoo Choi ◽  
Moo Young Lee ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Manganese Oxide ◽  
Water Oxidation ◽  
In Situ Raman Spectroscopy ◽  
In Situ Raman ◽  
Neutral Ph
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