Review
Engineering, Chemical
Ana Iglesias-Juez, Gian Luca Chiarello, Gregory S. Patience, M. Olga Guerrero-Perez
Summary: X-ray absorption spectroscopy (XAS) is a technique used to measure electron absorption spectra and study chemical bonds on catalyst surfaces. Researchers are developing new X-ray sources to measure catalyst stability and handle toxic substances.
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
(2022)
Article
Chemistry, Multidisciplinary
Janis Timoshenko, Felix T. Haase, Sascha Saddeler, Martina Ruescher, Hyo Sang Jeon, Antonia Herzog, Uta Hejral, Arno Bergmann, Stephan Schulz, Beatriz Roldan Cuenya
Summary: By using operando quick X-ray absorption fine structure spectroscopy and unsupervised/supervised machine learning methods, we can unveil the real active species and active states in bimetallic transition-metal oxide catalysts. Through principal component analysis and artificial neural network analysis, we can track the evolution of tetrahedrally and octahedrally coordinated species and understand the chemical changes and phase transitions taking place in CoxFe3-xO4 catalysts.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Electrochemistry
Thanit Saisopa, Kulpavee Jitapunkul, Aritsa Bunpheng, Hideki Nakajima, Ratchadaporn Supruangnet, Wutthikrai Busayaporn, Thitiwut Sukprom, Wisit Hirunpinyopas, Anusorn Seubsai, Prayoon Songsiriritthigul, Pawin Iamprasertkun
Summary: This work demonstrates the recycling process of TMDs materials, specifically WSe2, in electrochemistry. The unexfoliated WSe2 can be recycled up to 6 times, improving the production yield. The recycling processes directly affect the flake sizes and surface chemistry of the exfoliated samples.
ELECTROCHIMICA ACTA
(2023)
Article
Physics, Multidisciplinary
Krissia Zawadzki, Alberto Nocera, Adrian E. Feiguin
Summary: This study addresses the lack of theoretical understanding of the scattering cross-section in experiments with new light sources that provide unprecedented resolution in X-ray experiments. Traditional numerical techniques are limited in the case of strongly correlated electron systems, and a new alternative approach is proposed in this work. By solving the time-dependent Schrodinger equation in the time domain, the authors present a faithful simulation of scattering processes in actual experiments, including photons and core electrons. The proposed method can yield the full time and momentum resolved Resonant Inelastic X-Ray Scattering (RIXS) spectrum of strongly interacting many-body systems.
Article
Chemistry, Multidisciplinary
Francisco Garcia-Moreno, Paul Hans Kamm, Tillmann Robert Neu, Felix Bulk, Mike Andreas Noack, Mareike Wegener, Nadine von der Eltz, Christian Matthias Schleputz, Marco Stampanoni, John Banhart
Summary: This paper reviews recent developments in time-resolved X-ray tomography, which have led to fast imaging with high spatial resolution for studying the dynamic evolution and constituent distribution of materials. The study includes observations of reactions in different metal alloys, combustion processes, and bubble formation evolution, demonstrating the potential applications of the method in material research.
ADVANCED MATERIALS
(2021)
Article
Chemistry, Inorganic & Nuclear
M. Tavoliere, M. G. Zimicz, J. Vega-Castillo, Analia L. Soldati, F. Prado
Summary: The study on the solubility of Co in the (Ce0.9Zr0.1)(1-x)CoxO2-delta system shows that the incorporation of Co in Ce0.9Zr0.1O2-delta at temperatures equal to or higher than 600 degrees Celsius is negligible. This is an important result for catalytic applications, where characterizing the active center is crucial for understanding catalyst performance.
JOURNAL OF SOLID STATE CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Jacopo Stefano Pelli Cresi, Emiliano Principi, Eleonora Spurio, Daniele Catone, Patrick O'Keeffe, Stefano Turchini, Stefania Benedetti, Avinash Vikatakavi, Sergio D'Addato, Riccardo Mincigrucci, Laura Foglia, Gabor Kurdi, Ivaylo P. Nikolov, Giovanni De Ninno, Claudio Masciovecchio, Stefano Nannarone, Jagadesh Kopula Kesavan, Federico Boscherini, Paola Luches
Summary: This study demonstrates the potential of using free electron laser time-resolved soft X-ray absorption spectroscopy to characterize energy transfer processes in novel hybrid plasmonic/semiconductor materials. The results showed that excited silver nanoparticles transfer electrons to cerium atoms in a CeO2 film through a highly efficient electron-based mechanism. Ultrafast changes in the Ce N-4,N-5 absorption edge provided insights into this electron transfer process.
Article
Engineering, Chemical
Hongman Sun, Chunfen Wang, Shuzhuang Sun, Antonio T. Lopez, Youhe Wang, Jingbin Zeng, Zhen Liu, Zifeng Yan, Christopher M. A. Parlett, Chunfei Wu
Summary: An integrated carbon capture and utilization (ICCU) process, which combines CO2 capture and conversion catalysis, offers a promising solution for reducing CO2 emissions from fossil fuel-driven electricity production and transforming it into more valuable chemicals. This study investigates the mechanism of ICCU and the effect of reduction pretreatment on the process and products.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Chemistry, Applied
Soichi Kikkawa, Kentaro Teramura, Hiroyuki Asakura, Saburo Hosokawa, Tsunehiro Tanaka
Summary: Through in situ time-resolved XAS, the dynamic behavior of the formation of two-dimensional low-coordinated Pt particles through reduction of PtOx particles by H2 was observed. The reduction of relatively stabilized PtOx species occurred below 373 K, while the reduction of interfacial PtOx species on the γ-Al2O3 surface occurred above 373 K. The morphology changed from three-dimensional PtOx particles to two-dimensional low-coordinated Pt particles during the in situ reduction of PtOx/Al2O3 at 473 K, while at 373 K, the interfacial PtOx species remained after its reduction. This study demonstrated that in situ time-resolved XAS is one of the most definitive techniques to unveil the MSI effect during the reductive formation process of Pt nanoparticle catalysts loaded on γ-Al2O3.
Article
Chemistry, Inorganic & Nuclear
Edyta Piskorska-Hommel, Aneta Ciupa-Litwa
Summary: This paper reports the X-ray Absorption Fine Structure (XAFS) study of mixed-valence iron(II)-iron(III) formate frameworks undergoing order-disorder phase transitions. The analysis reveals slight changes in electron transfer and bond lengths during the phase transitions, defining the nature of the transition.
Article
Materials Science, Multidisciplinary
Getu Sitotaw Tesfaye, Yen-Ting Li, Yu-Hao Wu, Tai-Sing Wu, Chien-Yu Lee, Bo-Yi Chen, Gung-Chian Yin, Mau-Tsu Tang, Yu-Cheng Chiu, Bi-Hsuan Lin
Summary: This study investigates the recombination mechanisms of free and bound excitons in Eu-doped CsPbBr3. The emission intensity of free excitons decreases with decreasing temperature from 300 to 10 K, while the emission intensity of bound excitons appears at 100 K and rapidly increases with further temperature decrease. These phenomena are attributed to the dynamic migration of thermal energy between free and bound excitons caused by the presence of Eu3+ ions. The exciton-like emission is demonstrated by power-dependent photoluminescence (PL) experiments. Furthermore, the radiative and non-radiative recombinations of the bound exciton are determined through temperature-dependent time resolved photoluminescence (TR-PL), confirming that the bound exciton has an increased localization depth with decreasing temperature.
Article
Chemistry, Physical
Chen Wang, Aaron Malinoski
Summary: Understanding the reaction mechanisms of photocatalytic systems is crucial for rational design and optimization. Time-resolved optical spectroscopy is an important tool for unraveling the complexities in such systems by identifying intermediates and measuring kinetic parameters. By showcasing three examples, we highlight the significance of well-designed time-resolved spectroscopic experiments in mechanistic investigations, while emphasizing the need for complementary analytical methods to fully understand the complexities involved.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Spectroscopy
Wolfgang Malzer, Christopher Schlesiger, Birgit Kanngiesser
Summary: In recent years, new instrumentation for laboratory X-ray Absorption Spectroscopy (XAS) has sparked interest and debate, leading to a growing number of experiments and analytical applications. The principles and applications of these instruments are discussed, highlighting their significance in research within the fields of chemistry and materials science.
SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY
(2021)
Article
Physics, Condensed Matter
Alan Chadwick, C. Richard A. Catlow
Summary: This article presents a personal account of the developments in technique and instrumentation led by Neville Greaves, focusing on the pioneering period at the Synchrotron Radiation Source, Daresbury in the 1980s and 90s. It discusses and illustrates the lasting impact of these key developments on chemistry, materials, and catalytic science.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2021)
Article
Environmental Sciences
Jiayun Li, Liming Cao, Wenkang Gao, Lingyan He, Yingchao Yan, Yuexin He, Yuepeng Pan, Dongsheng Ji, Zirui Liu, Yuesi Wang
Summary: The study revealed that the seasonal variations in submicron particles at the Xinglong background mountainous site in the NCP are significantly influenced by aging processes and regional transport, with an increased contribution of aerosol nitrate in summer highlighting the critical importance of regional reductions in nitrogen oxide emissions for alleviating nitrate-dominated haze events over the NCP.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2021)
