scholarly journals A Theory-Guided X-ray Absorption Spectroscopy Approach for Identifying Active Sites in Atomically Dispersed Transition-Metal Catalysts

2021 ◽  
Author(s):  
Yizhen Chen ◽  
Rachita Rana ◽  
Tyler Sours ◽  
Fernando D. Vila ◽  
Shaohong Cao ◽  
...  
Keyword(s):  
Transition Metal ◽  
Absorption Spectroscopy ◽  
Active Sites ◽  
Metal Catalysts ◽  
Transition Metal Catalysts ◽  
X Ray ◽  
X Ray Absorption

scholarly journals The Effect of Iron Impurities on Transition Metal Catalysts for the Oxygen Evolution Reaction in Alkaline Environment: Activity Mediators or Active Sites?

2020 ◽  
Author(s):  
Ioannis Spanos ◽  
Justus Masa ◽  
Aleksandar Zeradjanin ◽  
Robert Schlögl
Keyword(s):  
Transition Metal ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Active Sites ◽  
Water Electrolysis ◽  
Metal Catalysts ◽  
Transition Metal Catalysts ◽  
Alkaline Water Electrolysis ◽  
Co Catalysts ◽  
Model Transition

AbstractThere is an ongoing debate on elucidating the actual role of Fe impurities in alkaline water electrolysis, acting either as reactivity mediators or as co-catalysts through synergistic interaction with the main catalyst material. This perspective summarizes the most prominent oxygen evolution reaction (OER) mechanisms mostly for Ni-based oxides as model transition metal catalysts and highlights the effect of Fe incorporation on the catalyst surface in the form of impurities originating from the electrolyte or co-precipitated in the catalyst lattice, in modulating the OER reaction kinetics, mechanism and stability. Graphic Abstract

Identification of Transition Metal Sites in Fused SiO2 by X-Ray Absorption Spectroscopy

1985 ◽  
Vol 61 ◽  
Author(s):  
Farrel W. Lytle ◽  
Robert B. Greegor
Keyword(s):  
Transition Metal ◽  
Transition Metals ◽  
Absorption Spectroscopy ◽  
Optical Data ◽  
Site Symmetry ◽  
X Ray ◽  
Hydrolysis Method ◽  
Fused Quartz ◽  
X Ray Absorption ◽  
Good Agreement

ABSTRACTX-ray absorption spectroscopy is used to determine valence and site symmetry for all the 3d transition metals in fused quartz prepared by the flame hydrolysis method. The results are compared with optical data on the same samples with generally good agreement.

scholarly journals Synthesis and X-ray absorption spectroscopy of potassium transition metal fluoride nanocrystals

CrystEngComm ◽  
2019 ◽  
Vol 21 (1) ◽  
pp. 135-144 ◽  
Author(s):  
Michael R. Plews ◽  
Tanghong Yi ◽  
John Lee ◽  
Emory Chan ◽  
John W. Freeland ◽  
...  
Keyword(s):  
Transition Metal ◽  
Absorption Spectroscopy ◽  
Metal Fluoride ◽  
X Ray ◽  
Colloidal Chemistry ◽  
X Ray Absorption

Nanocrystals of KMF3 (M = Mn–Ni) and K3MF6 (M = V, Fe) were synthesized via non-aqueous routes based on colloidal chemistry.

X-ray absorption spectroscopy study of the electronic structure and local coordination of 1st row transition metal-promoted Chevrel-phase sulfides

2019 ◽  
Vol 72 (8) ◽  
pp. 1322-1335 ◽  
Author(s):  
Joseph T. Perryman ◽  
Forrest P. Hyler ◽  
Jessica C. Ortiz-Rodríguez ◽  
Apurva Mehta ◽  
Ambarish R. Kulkarni ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Transition Metal ◽  
Absorption Spectroscopy ◽  
Spectroscopy Study ◽  
X Ray ◽  
Local Coordination ◽  
Chevrel Phase ◽  
X Ray Absorption
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