In Situ X-Ray Absorption Spectroscopy of the Oxygen K-Edge in a Lithiated Transition Metal Oxide Battery

2010 ◽  
Keyword(s):  
Transition Metal ◽  
Metal Oxide ◽  
Absorption Spectroscopy ◽  
Transition Metal Oxide ◽  
X Ray ◽  
X Ray Absorption

scholarly journals Transition metal oxide perovskites by photoelectron and x-ray absorption spectroscopy

Pramana ◽  
1979 ◽  
Vol 12 (4) ◽  
pp. 317-329 ◽  
Author(s):  
W H Madhusudan ◽  
Sheelavathi Kollali ◽  
P R Sarode ◽  
M S Hegde ◽  
P Ganguly ◽  
...  
Keyword(s):  
Transition Metal ◽  
Metal Oxide ◽  
Absorption Spectroscopy ◽  
Transition Metal Oxide ◽  
X Ray ◽  
X Ray Absorption

scholarly journals Redox chemistry of a binary transition metal oxide (AB2O4): a study of the Cu2+/Cu0 and Fe3+/Fe0 interconversions observed upon lithiation in a CuFe2O4 battery using X-ray absorption spectroscopy

2016 ◽  
Vol 18 (25) ◽  
pp. 16930-16940 ◽  
Author(s):  
Christina A. Cama ◽  
Christopher J. Pelliccione ◽  
Alexander B. Brady ◽  
Jing Li ◽  
Eric A. Stach ◽  
...  
Keyword(s):  
Transition Metal ◽  
Metal Oxide ◽  
Absorption Spectroscopy ◽  
Transition Metal Oxide ◽  
Redox Chemistry ◽  
Reduced Form ◽  
X Ray ◽  
X Ray Absorption

The first XAS study of (de)lithiation of CuFe2O4 showed iron can be reoxidized while Cu0 remains in its reduced form.

scholarly journals Electronic structure variations of polar and nonpolar ZnO lattices with nitrogen-ion bombardment using synchrotron-based in situ photoemission and X-ray absorption spectroscopy

2020 ◽  
Vol 27 (1) ◽  
pp. 83-89
Author(s):  
Yuyang Huang ◽  
Yaping Li ◽  
Meng Wu ◽  
Hui-Qiong Wang ◽  
Xuebin Yuan ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Transition Metal ◽  
Metal Oxide ◽  
Photoelectron Spectroscopy ◽  
Transition Metal Oxide ◽  
Material Design ◽  
Surface Polarity ◽  
X Ray ◽  
Nitrogen Ion ◽  
X Ray Absorption

Surface polarity with different crystal orientations has been demonstrated as a crucial parameter in determining the physical properties and device applications in many transition metal oxide and semiconductor compound systems. The influences of surface polarity on electronic structures in nitrogen-incorporated ZnO lattices have been investigated in the present work. The successful doping of nitrogen atoms in ZnO lattices is suggested by the existence of N-related chemical bonds obtained from X-ray photoelectron spectroscopy analysis where a pronounced N–Zn peak intensity has been observed in the (000\bar 1)-terminated polar ZnO compound compared with the (10\bar 10)-terminated nonpolar ZnO compound. An energy shift of the valence band maximum towards the Fermi level has been resolved for both polar and nonpolar ZnO lattices, whereas a charge redistribution of the O 2p hybridized states is only resolved for o-plane ZnO with a polar surface. Angular-dependent X-ray absorption analyses at the O K-edge reveal enhanced surface-state contributions and asymmetric O 2p orbital occupations in the (000\bar 1)-terminated o-plane ZnO compound. The results shed light on the efficient nitrogen doping in ZnO lattices with polar surfaces. The comprehensive electronic structure investigations of correlations between impurity doping and surface polarity in ZnO lattices may also offer guidance for the material design in other transition metal oxide and semiconductor systems.

scholarly journals X-ray Absorption Study of Graphene Oxide and Transition Metal Oxide Nanocomposites

2014 ◽  
Vol 118 (32) ◽  
pp. 18706-18712 ◽  
Author(s):  
Ram P. Gandhiraman ◽  
Dennis Nordlund ◽  
Cristina Javier ◽  
Jessica E. Koehne ◽  
Bin Chen ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Transition Metal ◽  
Metal Oxide ◽  
Transition Metal Oxide ◽  
Absorption Study ◽  
X Ray ◽  
X Ray Absorption

scholarly journals Unveiling the Degradation Nature of Pt/NbOx/C Catalysts for Oxygen Reduction Reaction via in situ X-ray Absorption Spectroscopy

2021 ◽  
Author(s):  
Ershuai Liu ◽  
Qingying Jia ◽  
Jun Yang ◽  
Kai Sun ◽  
Li Jiao ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Absorption Spectroscopy ◽  
Reduction Reaction ◽  
X Ray ◽  
Orr Activity ◽  
X Ray Absorption

Among various metal nanoparticles supported on metal oxide (MMO) catalysts, the Pt/NbOx/C system has promising oxygen reduction reaction (ORR) activity as cathode for proton exchange membrane fuel cells (PEMFCs). Herein, we study a series of Pt/NbOx/C catalysts with tunable structural and electronic properties via physical vapor deposition and unravel the nature of metal and metal oxide interaction (MMOI) by characterizing this system under reactive conditions. By conducting in situ X-ray absorption spectroscopy (XAS) experiments, we demonstrate the Pt preferably interacts with O but not Nb in the Pt/NbOx/C system and such Pt-O interaction benefits the ORR activity via electronic effect rather than strain effect. We also provide clear evidence for the formation of metallic Nb phase at the early stage of PEMFC operation and identify severe particle growth of Pt after long-term PEMFC operation. These findings deepen our understanding of the degradation mechanism of MMO catalysts during long-term PEMFC operation.

In situ X-ray absorption spectroscopy of transition metal based water oxidation catalysts

2017 ◽  
Vol 46 (1) ◽  
pp. 102-125 ◽  
Author(s):  
Christina H. M. van Oversteeg ◽  
Hoang Q. Doan ◽  
Frank M. F. de Groot ◽  
Tanja Cuk
Keyword(s):  
Electronic Structure ◽  
Transition Metal ◽  
Absorption Spectroscopy ◽  
Water Oxidation ◽  
Oxidation Catalysts ◽  
X Ray ◽  
Absorption Studies ◽  
X Ray Absorption

X-ray absorption studies of the geometric and electronic structure of primarily heterogeneous Co, Ni, and Mn based water oxidation catalysts are reviewed.

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