scholarly journals Simultaneous detection of electronic structure changes from two elements of a bifunctional catalyst using wavelength-dispersive X-ray emission spectroscopy and in situ electrochemistry

2015 ◽  
Vol 17 (14) ◽  
pp. 8901-8912 ◽  
Author(s):  
Sheraz Gul ◽  
Jia Wei Desmond Ng ◽  
Roberto Alonso-Mori ◽  
Jan Kern ◽  
Dimosthenis Sokaras ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Emission Spectroscopy ◽  
Simultaneous Detection ◽  
Bifunctional Catalyst ◽  
Metal Centers ◽  
X Ray ◽  
Structure Changes

A method of simultaneously probing the electronic structure of multiple metal centers using wavelength-dispersive X-ray emission spectroscopy was developed.

Operando soft X-ray emission spectroscopy of the Fe2O3 anode to observe the conversion reaction

2019 ◽  
Vol 21 (48) ◽  
pp. 26351-26357 ◽  
Author(s):  
Daisuke Asakura ◽  
Yusuke Nanba ◽  
Masashi Okubo ◽  
Hideharu Niwa ◽  
Hisao Kiuchi ◽  
...  
Keyword(s):  
Thin Film ◽  
Electronic Structure ◽  
Emission Spectroscopy ◽  
Li Ion Battery ◽  
Conversion Reaction ◽  
X Ray ◽  
Structure Changes ◽  
Li Ion

Drastic electronic-structure changes in an Fe2O3 thin film anode for a Li-ion battery during discharge (lithiation) and charge (delithiation) processes were observed using operando Fe 2p soft X-ray emission spectroscopy (XES).

scholarly journals Phosphorus Kβ X-Ray emission spectroscopy detects non-covalent interactions of phosphate biomolecules in situ

2021 ◽  
Author(s):  
Zachary Mathe ◽  
Olivia McCubbin Stepanic ◽  
Sergey Peredkov ◽  
Serena DeBeer
Keyword(s):  
Nucleic Acids ◽  
Emission Spectroscopy ◽  
Adenine Nucleotides ◽  
X Ray ◽  
Non Covalent Interactions ◽  
Covalent Interactions ◽  
Phosphate Groups

Phosphorus is ubiquitous in biochemistry, found in the phosphate groups of nucleic acids and the energy-transferring system of adenine nucleotides (e.g. ATP). Kβ X-ray emission spectroscopy (XES) at phosphorus has...

Potential‐Induced Spin Changes in Fe/N/C Electrocatalysts Assessed by In Situ X‐ray Emission Spectroscopy

2021 ◽  
Author(s):  
Viktoriia A. Saveleva ◽  
Kathrin Ebner ◽  
Lingmei Ni ◽  
Grigory Smolentsev ◽  
Daniel Klose ◽  
...  
Keyword(s):  
Emission Spectroscopy ◽  
X Ray

scholarly journals High-energy resolution X-ray absorption and emission spectroscopy reveals insight into unique selectivity of La-based nanoparticles for CO2

2015 ◽  
Vol 112 (52) ◽  
pp. 15803-15808 ◽  
Author(s):  
Ofer Hirsch ◽  
Kristina O. Kvashnina ◽  
Li Luo ◽  
Martin J. Süess ◽  
Pieter Glatzel ◽  
...  
Keyword(s):  
Energy Resolution ◽  
Emission Spectroscopy ◽  
High Energy ◽  
Unit Cell ◽  
High Energy Resolution ◽  
Electron Configuration ◽  
Edge Structure ◽  
X Ray ◽  
X Ray Absorption

The lanthanum-based materials, due to their layered structure and f-electron configuration, are relevant for electrochemical application. Particularly, La2O2CO3 shows a prominent chemoresistive response to CO2. However, surprisingly less is known about its atomic and electronic structure and electrochemically significant sites and therefore, its structure–functions relationships have yet to be established. Here we determine the position of the different constituents within the unit cell of monoclinic La2O2CO3 and use this information to interpret in situ high-energy resolution fluorescence-detected (HERFD) X-ray absorption near-edge structure (XANES) and valence-to-core X-ray emission spectroscopy (vtc XES). Compared with La(OH)3 or previously known hexagonal La2O2CO3 structures, La in the monoclinic unit cell has a much lower number of neighboring oxygen atoms, which is manifested in the whiteline broadening in XANES spectra. Such a superior sensitivity to subtle changes is given by HERFD method, which is essential for in situ studying of the interaction with CO2. Here, we study La2O2CO3-based sensors in real operando conditions at 250 °C in the presence of oxygen and water vapors. We identify that the distribution of unoccupied La d-states and occupied O p- and La d-states changes during CO2 chemoresistive sensing of La2O2CO3. The correlation between these spectroscopic findings with electrical resistance measurements leads to a more comprehensive understanding of the selective adsorption at La site and may enable the design of new materials for CO2 electrochemical applications.

Electronic structure of Mn in (Zn, Mn)O probed by resonant X-ray emission spectroscopy

2010 ◽  
Vol 150 (23-24) ◽  
pp. 1065-1068 ◽  
Author(s):  
J. Jin ◽  
G.S. Chang ◽  
W. Xu ◽  
Y.X. Zhou ◽  
D.W. Boukhvalov ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Emission Spectroscopy ◽  
X Ray

Multiwalled Carbon Nanotubes Covered with Cobalt (II) Phthalocyanine by In Situ Synthesis and its Electrochemical Sensing Performance towards DA and UA

2014 ◽  
Vol 809-810 ◽  
pp. 43-52
Author(s):  
Hua Hua Wang ◽  
Nan Li ◽  
Kai Li ◽  
Yuan Bu ◽  
Wen Le Dai ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Multiwalled Carbon Nanotubes ◽  
Photoelectron Spectroscopy ◽  
Simultaneous Detection ◽  
Thick Layer ◽  
Electrochemical Sensing ◽  
Multiwalled Carbon ◽  
X Ray ◽  
Platinum Particles

Multiwalled carbon nanotubes (MWCNTs) as an excellent supporter covered with a thick layer of cobalt phthalocyanine (CoPc) were prepared by in-situ synthesis. Platinum particles were adopted to enhance the conductivity of CoPc-MWCNTs. The final nanocomposite Pt-CoPc-MWCNTs was characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM). Strong aromatic π-π stacking between MWCNTs and CoPc made CoPc in-situ forming on MWCNTs. With homogeneous thickness of CoPc covered on the MWCNTs and Pt particles equally distributed, the nanocomposite was used as electrocatalyst. The electrochemical properties of the composite got researched by casting the dispersion of Pt-CoPc-MWCNTs on the glassy carbon electrode. Compared with other modified electrodes, Pt-CoPc-MWCNTs/GC electrode exhibited excellent electrochemical activity towards dopamine (DA) and uric acid (UA). Linear responses for DA and UA were obtained in the ranges of 5 to 170 μM and 5 to 100 μM, and limits of detection were 2.6 and 1.4 μM (S/N= 3), respectively. Simultaneous detection of DA and UA in the presence of ascorbic acid (AA) also displayed selective property, with no interference to each other.

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