X-ray absorption fine structure
View article
Coordination Tunes Selectivity: Two‐Electron Oxygen Reduction on High‐Loading Molybdenum Single‐Atom Catalysts Open
Single‐atom catalysts (SACs) have great potential in electrocatalysis. Their performance can be rationally optimized by tailoring the metal atoms, adjacent coordinative dopants, and metal loading. However, doing so is still a great challen…
View article
Inverse ZrO2/Cu as a highly efficient methanol synthesis catalyst from CO2 hydrogenation Open
Enhancing the intrinsic activity and space time yield of Cu based heterogeneous methanol synthesis catalysts through CO 2 hydrogenation is one of the major topics in CO 2 conversion into value-added liquid fuels and chemicals. Here we repo…
View article
In Situ Phosphatizing of Triphenylphosphine Encapsulated within Metal–Organic Frameworks to Design Atomic Co<sub>1</sub>–P<sub>1</sub>N<sub>3</sub> Interfacial Structure for Promoting Catalytic Performance Open
The engineering coordination environment offers great opportunity in performance tunability of isolated metal single-atom catalysts. For the most popular metal-Nx (MNx) structure, the replacement of N atoms by some other atoms with relativ…
View article
Operando Insight into the Correlation between the Structure and Composition of CuZn Nanoparticles and Their Selectivity for the Electrochemical CO<sub>2</sub> Reduction Open
Bimetallic CuZn catalysts have been recently proposed as alternatives in order to achieve selectivity control during the electrochemical reduction of CO2 (CO2RR). However, fundamental understanding of the underlying reaction mechanism and …
View article
Highly Active Ceria-Supported Ru Catalyst for the Dry Reforming of Methane: In Situ Identification of Ru<sup>δ+</sup>–Ce<sup>3+</sup> Interactions for Enhanced Conversion Open
The metal-oxide interaction changes the surface electronic states of catalysts deployed for chemical conversion, yet details of its influence on the catalytic performance under reaction conditions remain obscure. In this work, we report th…
View article
Effects of Zr Doping into Ceria for the Dry Reforming of Methane over Ni/CeZrO<sub>2</sub> Catalysts: In Situ Studies with XRD, XAFS, and AP-XPS Open
The methane activation and methane dry reforming reactions were studied and compared over 4 wt % Ni/CeO2 and 4 wt % Ni/CeZrO2 (containing 20 wt % Zr) catalysts. Upon the incorporation of Zr into the ceria support, the catalyst exhibited a …
View article
Operando Insights into Nanoparticle Transformations during Catalysis Open
Nanostructured materials play an important role in today's chemical industry, acting as catalysts in heterogeneous thermal and electrocatalytic processes for chemical energy conversion and the production of feedstock chemicals. Although ca…
View article
Plasma-Modified Dendritic Cu Catalyst for CO<sub>2</sub> Electroreduction Open
Efficient and active catalysts with high selectivity for hydrocarbons and other valuable chemicals during stable operation are crucial. We have taken advantage of low-pressure oxygen plasmas to modify dendritic Cu catalysts and were able t…
View article
Nitrogen-Stabilized Low-Valent Ni Motifs for Efficient CO<sub>2</sub> Electrocatalysis Open
Single-atom catalysts have found considerable applications in the field of electrochemical CO2 reduction reaction (CO2RR) due to their unique coordination environments. However, during the preparation of single-atom catalysts, some metal n…
View article
Activating Amorphous Ru Metallenes Through Co Integration for Enhanced Water Electrolysis Open
Designing efficient bifunctional electrocatalysts with excellent activity and robust stability presents a central challenge for the large‐scale commercialization of water electrolysis. Herein, a facile approach is reported for the construc…
View article
Experimental methods in chemical engineering: <span>X</span> ‐ray absorption spectroscopy— <span>XAS</span> , <span>XANES</span> , <span>EXAFS</span> Open
Although X‐ray absorption spectroscopy (XAS) was conceived in the early 20th century, it took 60 years after the advent of synchrotrons for researchers to exploit its tremendous potential. Counterintuitively, researchers are now developing…
View article
Dry Reforming of Ethane and Butane with CO<sub>2</sub> over PtNi/CeO<sub>2</sub> Bimetallic Catalysts Open
Dry reforming is a potential process to convert CO2 and light alkanes into syngas (H2 and CO), which can be subsequently transformed to chemicals and fuels. Here in this work, PtNi bimetallic catalysts have been investigated for dry reform…
View article
Neural Network Approach for Characterizing Structural Transformations by X-Ray Absorption Fine Structure Spectroscopy Open
The knowledge of the coordination environment around various atomic species in many functional materials provides a key for explaining their properties and working mechanisms. Many structural motifs and their transformations are difficult …
View article
Single‐Atom Catalysts Supported by Crystalline Porous Materials: Views from the Inside Open
Single‐atom catalysts (SACs) have recently emerged as an exciting system in heterogeneous catalysis showing outstanding performance in many catalytic reactions. Single‐atom catalytic sites alone are not stable and thus require stabilizatio…
View article
A beamline for bulk sample x-ray absorption spectroscopy at the high brilliance storage ring PETRA III Open
P65 is a new X-ray Absorption Fine Structure (XAFS) spectroscopy beamline at the high brilliance storage ring PETRA III in Hamburg, Germany. It is providing a mm sized beam and a monochromatic photon flux of up to 1012 s−1 at 9 keV. The be…
View article
An improved laboratory-based x-ray absorption fine structure and x-ray emission spectrometer for analytical applications in materials chemistry research Open
X-ray absorption fine structure (XAFS) and x-ray emission spectroscopy (XES) are advanced x-ray spectroscopies that impact a wide range of disciplines. However, unlike the majority of other spectroscopic methods, XAFS and XES are accompani…
View article
Recent advances in battery characterization using in situ XAFS, SAXS, XRD, and their combining techniques: From single scale to multiscale structure detection Open
Revealing and clarifying the chemical reaction processes and mechanisms inside the batteries will bring a great help to the controllable preparation and performance modulation of batteries. Advanced characterization techniques based on syn…
View article
Boehmite and Gibbsite Nanoplates for the Synthesis of Advanced Alumina Products Open
Boehmite (γ-AlOOH) and gibbsite (α-Al-(OH)3) are important archetype (oxy)hydroxides of aluminum in nature that also play diverse roles across a plethora of industrial applications. Developing the ability to understand and predict the prop…
View article
<i>Operando</i>characterization of batteries using x-ray absorption spectroscopy: advances at the beamline XAFS at synchrotron Elettra Open
X-ray absorption spectroscopy is a synchrotron radiation based technique that is able to \nprovide information on both local structure and electronic properties in a chemically selective \nmanner. It can be used to characterize the dynamic…
View article
High-flux XAFS-beamline P64 at PETRA III Open
Beamline P64 at PETRA III is dedicated to x-ray absorption spectroscopy experiments which require high flux, like quick extended x-ray absorption fine structure spectroscopy on the sub-second time scale, high-resolution resonant emission s…
View article
Challenges and Opportunities for Applications of Advanced X-ray Spectroscopy in Catalysis Research Open
X-ray spectroscopy has had a significant and continually growing impact on catalysis research for nearly 50 years. In particular, the ability to obtain element selective electronic and geometric structural information via the X-ray absorpt…
View article
Subnanometer Substructures in Nanoassemblies Formed from Clusters under a Reactive Atmosphere Revealed Using Machine Learning Open
Size-selected clusters, soft-landed on an oxide substrate, is a promising and highly tunable material for heterogeneous catalysis. Agglomeration of the deposited clusters, however, leads to changes in the particle properties and structure.…
View article
X-ray Absorption Fine Structure (XAFS) Studies of Oxide Glasses—A 45-Year Overview Open
X-ray Absorption Fine Structure (XAFS) spectroscopy has been widely used to characterize the short-range order of glassy materials since the theoretical basis was established 45 years ago. Soon after the technique became accessible, mainly…
View article
In situ turning defects of exfoliated Ti <sub>3</sub> C <sub>2</sub> MXene into Fenton-like catalytic active sites Open
Controllable in situ formation of nanoclusters with discrete active sites is highly desirable in heterogeneous catalysis. Herein, a titanium oxide–based Fenton-like catalyst is constructed using exfoliated Ti 3 C 2 MXene as a template. The…
View article
Atomic Carbon Layers Supported Pt Nanoparticles for Minimized CO Poisoning and Maximized Methanol Oxidation Open
Maximizing activity of Pt catalysts toward methanol oxidation reaction (MOR) together with minimized poisoning of adsorbed CO during MOR still remains a big challenge. In the present work, uniform and well‐distributed Pt nanoparticles (NPs…
View article
Detection of key transient Cu intermediates in SSZ-13 during NH<sub>3</sub>-SCR deNO<sub>x</sub> by modulation excitation IR spectroscopy Open
Protagonists in the standard SCR reaction have been caught in the act by modulation excitation IR & XAFS spectroscopy.
View article
Promotional Effect of La in the Three-Way Catalysis of La-Loaded Al<sub>2</sub>O<sub>3</sub>-Supported Pd Catalysts (Pd/La/Al<sub>2</sub>O<sub>3</sub>) Open
La-loaded Al2O3 (La/Al2O3) is a practical support for three-way catalysis (TWC) reactions. Although it has been reported that the addition of La to Al2O3 results in improved thermal stability to retain high specific surface areas, its effe…
View article
Metal–Support Interactions and C1 Chemistry: Transforming Pt-CeO <sub>2</sub> into a Highly Active and Stable Catalyst for the Conversion of Carbon Dioxide and Methane Open
There is an ongoing search for materials which can accomplish the activation of two dangerous greenhouse gases like carbon dioxide and methane. In the area of C1 chemistry, the reaction between CO2 and CH4 to produce syngas (CO/H2), known …
View article
Ex Situ and Operando XRD and XAS Analysis of MoS<sub>2</sub>: A Lithiation Study of Bulk and Nanosheet Materials Open
Molybdenum(IV) sulfide (MoS2) has generated significant interest as an electroactive material for Li-ion batteries because of its high theoretical capacity, good rate capability, and minimal volume changes during cycling. An important chal…
View article
General negative pressure annealing approach for creating ultra-high-loading single atom catalyst libraries Open
Catalyst systems populated by high-density single atoms are crucial for improving catalytic activity and selectivity, which can potentially maximize the industrial prospects of heterogeneous single-atom catalysts (SACs). However, achieving…