scholarly journals Redefinition of the Active Species and the Mechanism of the Oxygen Evolution Reaction on Gold Oxide

ACS Catalysis ◽  
2020 ◽  
Vol 10 (21) ◽  
pp. 12582-12589 ◽  
Author(s):  
Shengxiang Yang ◽  
Dennis G. H. Hetterscheid
Keyword(s):  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Active Species ◽  
Gold Oxide

scholarly journals Surface constrained electron-hole rich species active in the electrocatalytic water splitting

2020 ◽  
Author(s):  
Juan Velasco-Vélez ◽  
Emilia Carbonio ◽  
Cheng-Hao Chuang ◽  
Cheng-Jhih Hsu ◽  
Jyh-Fu Lee ◽  
...  
Keyword(s):  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
High Performance ◽  
Active Species ◽  
Nucleophilic Attack ◽  
High Coverage ◽  
Near Surface ◽  
Nano Fabrication ◽  
Material Usage ◽  
Water Activation

Abstract Iridium and its oxides/hydroxides are the best candidates for the oxygen evolution reaction under harsh acidic conditions owing to the low overpotential and the high corrosion resistance observed for Ir-based anodes. Herein, by means of cutting edge operando surface and bulk sensitive X-ray spectroscopy techniques, specifically designed electrode nano-fabrication and ab initio DFT calculations, we were able to reveal the electronic structure of the active IrOx centers (i.e. oxidation state) during electrocatalytic oxidation of water in the surface and bulk of high-performance Ir-based catalysts. We found the oxygen evolution reaction is controlled by the formation of empty Ir 5d states in the surface ascribed to the formation of formally IrV species leading to the appearance of electron-deficient oxygen species bound to single iridium atoms (µ1-O and µ1-OH) that are responsible for water activation and oxidation, due to the bound oxygen’s transformation into an oxyl susceptible to nucleophilic attack water. Oxygen bound to three iridium centers (µ3-O) remains the dominant species in the bulk but do not participate directly in the electrocatalytic reaction, suggesting bulk oxidation is limited. In addition a high coverage of a µ1-OO (peroxo) species during the OER is excluded. Moreover, we provide the first photoelectron spectroscopic evidence in bulk electrolyte that the higher surface to bulk ratio in thinner electrodes enhances the material usage involving the precipitation of a significant part of the electrode surface and near-surface active species.

Electrochemical water oxidation by cobalt-Prussian blue coordination polymer and theoretical studies of the electronic structure of the active species

2019 ◽  
Vol 48 (15) ◽  
pp. 4811-4822 ◽  
Author(s):  
Bruno M. Pires ◽  
Pãmyla L. dos Santos ◽  
Vera Katic ◽  
Stefan Strohauer ◽  
Richard Landers ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Coordination Polymer ◽  
Prussian Blue ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Water Oxidation ◽  
Active Species ◽  
Theoretical Studies ◽  
Earth Abundant ◽  
Neutral Conditions

The search for earth-abundant metal-based catalysts for the oxygen evolution reaction (OER) that operates in neutral conditions is a challenge in the field of sustainable energy.

scholarly journals Regulating the active species of Ni(OH)2 using CeO2: 3D CeO2/Ni(OH)2/carbon foam as an efficient electrode for the oxygen evolution reaction

2017 ◽  
Vol 8 (4) ◽  
pp. 3211-3217 ◽  
Author(s):  
Zhengqing Liu ◽  
Na Li ◽  
Hongyang Zhao ◽  
Yi Zhang ◽  
Yunhui Huang ◽  
...  
Keyword(s):  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Carbon Foam ◽  
Active Species

We found that Ni(OH)2 nanosheets of Ni(OH)2/NOSCF decorated with ∼3.3 nm CeO2 NPs displayed enhanced OER performance.

Boosting electrochemical water oxidation through replacement of Oh Co sites in cobalt oxide spinel with manganese

2017 ◽  
Vol 53 (57) ◽  
pp. 8018-8021 ◽  
Author(s):  
Prashanth W. Menezes ◽  
Arindam Indra ◽  
Vitaly Gutkin ◽  
Matthias Driess
Keyword(s):  
Cobalt Oxide ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Water Oxidation ◽  
Lattice Structure ◽  
Active Species ◽  
Structure Activity ◽  
Spinel Lattice ◽  
Oxide Spinel

Effect of substitution in the spinel lattice, structure–activity relation and nature of active species involved during oxygen evolution reaction were uncovered in the manganese cobalt oxide (MCO).

scholarly journals The identification of active N species in N-doped carbon carriers that improve the activity of Fe electrocatalysts towards the oxygen evolution reaction

RSC Advances ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 4806-4811
Author(s):  
Jia Jia ◽  
Ziwu Liu ◽  
Fei Han ◽  
Guo-Jun Kang ◽  
Ling Liu ◽  
...  
Keyword(s):  
Dft Calculations ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Active Species ◽  
Fe Catalyst

Experiments and DFT calculations demonstrate that graphitic N is the active species which improves the OER activity of Fe catalyst.

Operando X-ray spectroscopic tracking of self-reconstruction for anchored nanoparticles as high-performance electrocatalysts towards oxygen evolution

2018 ◽  
Vol 11 (10) ◽  
pp. 2945-2953 ◽  
Author(s):  
Sanzhao Song ◽  
Jing Zhou ◽  
Xiaozhi Su ◽  
Yu Wang ◽  
Jiong Li ◽  
...  
Keyword(s):  
Oxygen Evolution ◽  
Absorption Spectroscopy ◽  
Oxygen Evolution Reaction ◽  
High Performance ◽  
Active Species ◽  
X Ray ◽  
Electrochemical Condition ◽  
New Type ◽  
X Ray Absorption

Operando X-ray absorption spectroscopy (XAS) technique unravels that the CoFe nanoparticles in a new type of lanthana-anchored CoFe catalyst are nearly transformed into unique (Co/Fe)O(OH) under the electrochemical condition, as real active species for oxygen evolution reaction.

First insight on Mo(II) as electrocatalytically active species for oxygen evolution reaction

2019 ◽  
Vol 44 (3) ◽  
pp. 1345-1351 ◽  
Author(s):  
Zailun Liu ◽  
Chen Yuan ◽  
Fei Teng ◽  
Maoyuan Tang ◽  
Zain Ul Abideen ◽  
...  
Keyword(s):  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Active Species

scholarly journals A CoV2O4 precatalyst for the oxygen evolution reaction: highlighting the importance of postmortem electrocatalyst characterization

2021 ◽  
Author(s):  
Samuel E. Michaud ◽  
Michael T. Riehs ◽  
Wei-Jie Feng ◽  
Chia-Cheng Lin ◽  
Charles C. L. McCrory
Keyword(s):  
Cobalt Oxide ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Active Species

Postmortem analysis of a CoV2O4 catalyst for oxygen evolution reveals the active species is likely a vanadium-free amorphous cobalt oxide.

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