Activation of Oxygen on Gold/Alumina Catalysts: In Situ High-Energy-Resolution Fluorescence and Time-Resolved X-ray Spectroscopy

2006 ◽  
Vol 118 (28) ◽  
pp. 4767-4770 ◽  
Author(s):  
Jeroen A. van Bokhoven ◽  
Catherine Louis ◽  
Jeffrey T. Miller ◽  
Moniek Tromp ◽  
Olga V. Safonova ◽  
...  
Keyword(s):  
Energy Resolution ◽  
High Energy ◽  
High Energy Resolution ◽  
Time Resolved ◽  
X Ray ◽  
Activation Of Oxygen ◽  
Alumina Catalysts

Activation of Oxygen on Gold/Alumina Catalysts: In situ High-Energy-Resolution Fluorescence and Time-Resolved X-Ray Spectroscopy.

ChemInform ◽  
2006 ◽  
Vol 37 (38) ◽  
Author(s):  
Jeroen A. van Bokhoven ◽  
Catherine Louis ◽  
Jeffrey T. Miller ◽  
Moniek Tromp ◽  
Olga V. Safonova ◽  
...  
Keyword(s):  
Energy Resolution ◽  
High Energy ◽  
High Energy Resolution ◽  
Time Resolved ◽  
X Ray ◽  
Activation Of Oxygen ◽  
Alumina Catalysts

Activation of Oxygen on Gold/Alumina Catalysts: In Situ High-Energy-Resolution Fluorescence and Time-Resolved X-ray Spectroscopy

2006 ◽  
Vol 45 (28) ◽  
pp. 4651-4654 ◽  
Author(s):  
Jeroen A. van Bokhoven ◽  
Catherine Louis ◽  
Jeffrey T. Miller ◽  
Moniek Tromp ◽  
Olga V. Safonova ◽  
...  
Keyword(s):  
Energy Resolution ◽  
High Energy ◽  
High Energy Resolution ◽  
Time Resolved ◽  
X Ray ◽  
Activation Of Oxygen ◽  
Alumina Catalysts

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.

scholarly journals Wetting Induced Oxidation of Pt-based Nano Catalysts Revealed by In Situ High Energy Resolution X-ray Absorption Spectroscopy

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Yi-Tao Cui ◽  
Yoshihisa Harada ◽  
Hideharu Niwa ◽  
Tatsuya Hatanaka ◽  
Naoki Nakamura ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
Energy Resolution ◽  
High Energy ◽  
High Energy Resolution ◽  
X Ray ◽  
Nano Catalysts ◽  
X Ray Absorption

scholarly journals Electrochemical Adsorption on Pt Nanoparticles in Alkaline Solution Observed Using In Situ High Energy Resolution X-ray Absorption Spectroscopy

Nanomaterials ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 642 ◽  
Author(s):  
Shogo Kusano ◽  
Daiju Matsumura ◽  
Kenji Ishii ◽  
Hirohisa Tanaka ◽  
Jun’ichiro Mizuki
Keyword(s):  
Absorption Spectroscopy ◽  
Energy Resolution ◽  
Alkaline Solution ◽  
Superoxide Anion ◽  
Atomic Oxygen ◽  
High Energy ◽  
High Energy Resolution ◽  
X Ray ◽  
X Ray Absorption

The oxygen reduction reaction (ORR) on Pt/C in alkaline solution was studied by in situ high energy resolution X-ray absorption spectroscopy. To discuss the X-ray absorption near-edge structure (XANES), this paper introduced the rate of change of the Δμ (RCD), which is an analysis method that is sensitive to surface adsorption. The surface adsorptions as hydrogen (below 0.34 V), superoxide anion (from 0.34 V to 0.74 V), hydroxyl species (from 0.44 V to 0.74 V), atomic oxygen (above 0.74 V), and α-PtO2 (above 0.94 V) were distinguished. It is clarified that the catalytic activity in an alkaline solution is enhanced by the stability of atomic oxygen and the low stability of superoxide anion/peroxide adsorption on the platinum surface.

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