Elucidating the Domain Structure of the Cobalt Oxide Water Splitting Catalyst by X-ray Pair Distribution Function Analysis

2012 ◽  
Vol 134 (27) ◽  
pp. 11096-11099 ◽  
Author(s):  
Pingwu Du ◽  
Oleksandr Kokhan ◽  
Karena W. Chapman ◽  
Peter J. Chupas ◽  
David M. Tiede
Keyword(s):  
Distribution Function ◽  
Cobalt Oxide ◽  
Water Splitting ◽  
Domain Structure ◽  
Pair Distribution Function ◽  
Function Analysis ◽  
X Ray

scholarly journals Oxyanion induced variations in domain structure for amorphous cobalt oxide oxygen evolving catalysts, resolved by X-ray pair distribution function analysis

2015 ◽  
Vol 71 (6) ◽  
pp. 713-721 ◽  
Author(s):  
Gihan Kwon ◽  
Oleksandr Kokhan ◽  
Ali Han ◽  
Karena W. Chapman ◽  
Peter J. Chupas ◽  
...  
Keyword(s):  
Distribution Function ◽  
Metal Oxide ◽  
Domain Structure ◽  
Pair Distribution Function ◽  
Oxide Catalyst ◽  
Function Analysis ◽  
Domain Size ◽  
X Ray ◽  
Amorphous Metal Oxide ◽  
Oxygen Evolving

Amorphous thin film oxygen evolving catalysts, OECs, of first-row transition metals show promise to serve as self-assembling photoanode materials in solar-driven, photoelectrochemical `artificial leaf' devices. This report demonstrates the ability to use high-energy X-ray scattering and atomic pair distribution function analysis, PDF, to resolve structure in amorphous metal oxide catalyst films. The analysis is applied here to resolve domain structure differences induced by oxyanion substitution during the electrochemical assembly of amorphous cobalt oxide catalyst films, Co-OEC. PDF patterns for Co-OEC films formed using phosphate, Pi, methylphosphate, MPi, and borate, Bi, electrolyte buffers show that the resulting domains vary in size following the sequence Pi < MPi < Bi. The increases in domain size for CoMPi and CoBi were found to be correlated with increases in the contributions from bilayer and trilayer stacked domains having structures intermediate between those of the LiCoOO and CoO(OH) mineral forms. The lattice structures and offset stacking of adjacent layers in the partially stacked CoMPi and CoBi domains were best matched to those in the LiCoOO layered structure. The results demonstrate the ability of PDF analysis to elucidate features of domain size, structure, defect content and mesoscale organization for amorphous metal oxide catalysts that are not readily accessed by other X-ray techniques. PDF structure analysis is shown to provide a way to characterize domain structures in different forms of amorphous oxide catalysts, and hence provide an opportunity to investigate correlations between domain structure and catalytic activity.

Domain structure for an amorphous iridium-oxide water-oxidation catalyst characterized by X-ray pair distribution function analysis

2014 ◽  
Vol 16 (5) ◽  
pp. 1814-1819 ◽  
Author(s):  
Jier Huang ◽  
James D. Blakemore ◽  
Diego Fazi ◽  
Oleksandr Kokhan ◽  
Nathan D. Schley ◽  
...  
Keyword(s):  
Distribution Function ◽  
Domain Structure ◽  
Water Oxidation ◽  
Pair Distribution Function ◽  
Function Analysis ◽  
Iridium Oxide ◽  
Oxidation Catalyst ◽  
X Ray

Real-Space X-Ray Pair Distribution Function Analysis and Molecular-Dynamics Modelling of Diflunisal Channel Hydrates

2020 ◽  
Author(s):  
Anuradha Pallipurath ◽  
Francesco Civati ◽  
Jonathan Skelton ◽  
Dean Keeble ◽  
Clare Crowley ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Distribution Function ◽  
Structural Dynamics ◽  
First Principles ◽  
Pair Distribution Function ◽  
Function Analysis ◽  
Real Space ◽  
X Ray ◽  
Dynamics Modelling ◽  
Dynamics Simulations

X-ray pair distribution function analysis is used with first-principles molecular dynamics simulations to study the co-operative H<sub>2</sub>O binding, structural dynamics and host-guest interactions in the channel hydrate of diflunisal.

Thermal stability of Mg3Sb1.475Bi0.475Te0.05 high performance n-type thermoelectric investigated through powder X-ray diffraction and pair distribution function analysis

2018 ◽  
Vol 6 (35) ◽  
pp. 17171-17176 ◽  
Author(s):  
Lasse Rabøl Jørgensen ◽  
Jiawei Zhang ◽  
Christian Bonar Zeuthen ◽  
Bo Brummerstedt Iversen
Keyword(s):  
Thermal Stability ◽  
Distribution Function ◽  
Pair Distribution Function ◽  
High Performance ◽  
Function Analysis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Thermal Stability Of

The thermal stability of the high performance n-type Te-doped Mg3Sb1.5Bi0.5 system is investigated.

Cation distribution of Mn-Zn ferrite nanoparticles using pair distribution function analysis and resonant X-ray scattering

2018 ◽  
Vol 124 (5) ◽  
pp. 56001 ◽  
Author(s):  
Rodrigo U. Ichikawa ◽  
João P. R. L. L. Parra ◽  
Oriol Vallcorba ◽  
Inma Peral ◽  
Walter K. Yoshito ◽  
...  
Keyword(s):  
Distribution Function ◽  
Cation Distribution ◽  
Pair Distribution Function ◽  
Function Analysis ◽  
Ferrite Nanoparticles ◽  
X Ray ◽  
X Ray Scattering ◽  
Zn Ferrite ◽  
Ray Scattering

scholarly journals Drying-induced atomic structural rearrangements in sodium-based calcium-alumino-silicate-hydrate gel and the mitigating effects of ZrO2 nanoparticles

2018 ◽  
Vol 20 (13) ◽  
pp. 8593-8606 ◽  
Author(s):  
Kengran Yang ◽  
V. Ongun Özçelik ◽  
Nishant Garg ◽  
Kai Gong ◽  
Claire E. White
Keyword(s):  
Distribution Function ◽  
Atomic Structure ◽  
Pair Distribution Function ◽  
Function Analysis ◽  
Zro2 Nanoparticles ◽  
Structural Rearrangements ◽  
X Ray ◽  
Alumino Silicate ◽  
Activated Slag

Drying-induced nanoscopic alterations to the local atomic structure of silicate-activated slag and the mitigated effects of nano-ZrO2 are elucidated using in situ X-ray pair distribution function analysis.

scholarly journals Total-scattering pair-distribution function analysis of zinc from high-energy synchrotron data

2019 ◽  
Vol 33 (33) ◽  
pp. 1950410 ◽  
Author(s):  
Ahmad S. Masadeh ◽  
Moneeb T. M. Shatnawi ◽  
Ghosoun Adawi ◽  
Yang Ren
Keyword(s):  
Crystal Structure ◽  
Distribution Function ◽  
Pair Distribution Function ◽  
Function Analysis ◽  
High Energy ◽  
Ambient Conditions ◽  
Total Scattering ◽  
X Ray ◽  
Zinc Metal ◽  
Pdf Analysis

The crystal structure of zinc metal deviates from the ideal hexagonal close packing structure by a significantly increased axial ratio (c/a). The local atomic structure of zinc metal is investigated using the total scattering atomic pair distribution function (PDF) analysis based on X-ray powder diffraction data collected at ambient conditions. The X-ray total scattering PDF analysis confirms that the crystal structure of zinc can be described in terms of wurtzite structure, but with an anomalously atomic displacement parameters [Formula: see text], indicating a significant displacement disorder along the [Formula: see text]-axis. For the long [Formula: see text]-range PDF refinements, the thermal motion of zinc shows a notable anisotropy as expressed by the ratio [Formula: see text]/[Formula: see text] of 2.5 at ambient conditions. This average distortion level along the [Formula: see text]-axis, was not reflected locally for the features below 5.0 Å as it fits the high [Formula: see text] region. Based on PDF refinements over different [Formula: see text]-ranges, we measure an interesting increase of the [Formula: see text] value with decreasing the [Formula: see text]-range of the refinement. This suggests that the local structure features in zinc metal differ from the average structure ones.

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