scholarly journals Operando Raman spectroscopy tracks oxidation-state changes in an amorphous Co oxide material for electrocatalysis of the oxygen evolution reaction

2020 ◽  
Vol 152 (19) ◽  
pp. 194202 ◽  
Author(s):  
Chiara Pasquini ◽  
Luca D’Amario ◽  
Ivelina Zaharieva ◽  
Holger Dau
Keyword(s):  
Raman Spectroscopy ◽  
Oxygen Evolution ◽  
Oxidation State ◽  
Oxygen Evolution Reaction ◽  
Oxide Material ◽  
State Changes

Tuning the oxidation state of manganese oxide nanoparticles on oxygen- and nitrogen-functionalized carbon nanotubes for the electrocatalytic oxygen evolution reaction

2017 ◽  
Vol 19 (28) ◽  
pp. 18434-18442 ◽  
Author(s):  
Hendrik Antoni ◽  
Wei Xia ◽  
Justus Masa ◽  
Wolfgang Schuhmann ◽  
Martin Muhler
Keyword(s):  
Carbon Nanotubes ◽  
Manganese Oxide ◽  
Oxygen Evolution ◽  
Oxidation State ◽  
Oxygen Evolution Reaction ◽  
Oxide Nanoparticles ◽  
Functionalized Carbon Nanotubes ◽  
Manganese Oxide Nanoparticles

The oxidation state of manganese oxide nanoparticles can be more easily changed when using nitrogen-functionalized carbon nanotubes as the support.

scholarly journals Tuning the Co Oxidation State in Ba0.5Sr0.5Co0.8Fe0.2O3-δ by Flame Spray Synthesis Towards High Oxygen Evolution Reaction Activity

Catalysts ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 984 ◽  
Author(s):  
Dino Aegerter ◽  
Mario Borlaf ◽  
Emiliana Fabbri ◽  
Adam H. Clark ◽  
Maarten Nachtegaal ◽  
...  
Keyword(s):  
Oxygen Evolution ◽  
Oxidation State ◽  
Oxygen Evolution Reaction ◽  
Noble Metals ◽  
Scale Up ◽  
Future Application ◽  
Flame Spray ◽  
Oxygen Vacancy Concentration ◽  
Synthesis Parameters ◽  
Flame Spray Synthesis

The perovskite-type oxide Ba0.5Sr0.5Co0.8Fe0.2O3-δ (BSCF) is known as a highly active and stable oxygen evolution reaction (OER) electrocatalyst composited out of non-noble metals. The possibility of using the scalable flame spray synthesis (FSS) technique for the production of BSCF nanoparticles intensified the interest in this material for a future application in an alkaline water electrolyzer. A possible scale-up would require the optimization of the synthesis parameters to maximize the production rate. To further understand the influence of the synthesis parameters of the tunable FSS on the OER activity of BSCF, a systematic study was carried out by producing BSCF with different total metal concentrations (CTM), flow rates of the precursor solution (FRPS) and of the dispersion gas (FRDG). This study reveals that all three parameters have a direct impact on the OER activity of BSCF—measured in a rotating disc electrode (RDE) setup—due to the controllability of the initial Co and Fe oxidation state—indicated by X-ray absorption spectroscopy (XAS) measurements—and with that also of the oxygen vacancy concentration in the as-synthesized BSCF. This controllability enables the optimization of the OER activity of BSCF and emphasizes the importance of having Co in a lower initial oxidation state for reaching a high electrocatalytic performance.

scholarly journals Cover Feature: Manganese Oxide as an Inorganic Catalyst for the Oxygen Evolution Reaction Studied by X‐Ray Photoelectron and Operando Raman Spectroscopy (ChemCatChem 4/2021)

ChemCatChem ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 1035-1035
Author(s):  
Hannes Radinger ◽  
Paula Connor ◽  
Robert Stark ◽  
Wolfram Jaegermann ◽  
Bernhard Kaiser
Keyword(s):  
Raman Spectroscopy ◽  
Manganese Oxide ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
X Ray

Effect of a Surface Area and a d-Band Oxidation State on the Activity and Stability of RuOxElectrocatalysts for Oxygen Evolution Reaction

2015 ◽  
Vol 36 (7) ◽  
pp. 1874-1877 ◽  
Author(s):  
Tae-Jun Kim ◽  
Shin-Ae Park ◽  
Seohyoung Chang ◽  
Ho-hwan Chun ◽  
Yong-Tae Kim
Keyword(s):  
Surface Area ◽  
Oxygen Evolution ◽  
Oxidation State ◽  
Oxygen Evolution Reaction

Modulating the Oxidation State of Nickel–Iron Layered Double Hydroxide by Natural Cooling for Oxygen Evolution Reaction

CrystEngComm ◽  
2022 ◽  
Author(s):  
Yong Wu ◽  
Qin Zhang ◽  
Cheng Bai ◽  
Xinyu Zhang ◽  
Xiaolin Hu ◽  
...  
Keyword(s):  
Oxygen Evolution ◽  
Layered Double Hydroxide ◽  
Oxidation State ◽  
Oxygen Evolution Reaction ◽  
Surface Oxidation ◽  
Nickel Iron ◽  
Double Hydroxide

Regulating surface oxidation state and understanding how it govern the reactivity and durability of electrocatalysts are a key problem for designing the promising OER electrocatalysts. Here, it is reported that...

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