1
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Wang J, Hsu CS, Wu TS, Chan TS, Suen NT, Lee JF, Chen HM. In situ X-ray spectroscopies beyond conventional X-ray absorption spectroscopy on deciphering dynamic configuration of electrocatalysts. Nat Commun 2023; 14:6576. [PMID: 37852958 PMCID: PMC10584842 DOI: 10.1038/s41467-023-42370-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2023] [Accepted: 10/04/2023] [Indexed: 10/20/2023] Open
Abstract
Realizing viable electrocatalytic processes for energy conversion/storage strongly relies on an atomic-level understanding of dynamic configurations on catalyst-electrolyte interface. X-ray absorption spectroscopy (XAS) has become an indispensable tool to in situ investigate dynamic natures of electrocatalysts but still suffers from limited energy resolution, leading to significant electronic transitions poorly resolved. Herein, we highlight advanced X-ray spectroscopies beyond conventional XAS, with emphasis on their unprecedented capabilities of deciphering key configurations of electrocatalysts. The profound complementarities of X-ray spectroscopies from various aspects are established in a probing energy-dependent "in situ spectroscopy map" for comprehensively understanding the solid-liquid interface. This perspective establishes an indispensable in situ research model for future studies and offers exciting research prospects for scientists and spectroscopists.
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Affiliation(s)
- Jiali Wang
- Department of Chemistry and Center for Emerging Materials and Advanced Devices, National Taiwan University, Taipei, 10617, Taiwan
| | - Chia-Shuo Hsu
- Department of Chemistry and Center for Emerging Materials and Advanced Devices, National Taiwan University, Taipei, 10617, Taiwan
| | - Tai-Sing Wu
- National Synchrotron Radiation Research Center, Hsinchu, 30076, Taiwan
| | - Ting-Shan Chan
- National Synchrotron Radiation Research Center, Hsinchu, 30076, Taiwan.
| | - Nian-Tzu Suen
- College of Chemistry & Chemical Engineering, Yangzhou University, 225002, Yangzhou, China
| | - Jyh-Fu Lee
- National Synchrotron Radiation Research Center, Hsinchu, 30076, Taiwan
| | - Hao Ming Chen
- Department of Chemistry and Center for Emerging Materials and Advanced Devices, National Taiwan University, Taipei, 10617, Taiwan.
- National Synchrotron Radiation Research Center, Hsinchu, 30076, Taiwan.
- Graduate Institute of Nanomedicine and Medical Engineering, College of Biomedical Engineering, Taipei Medical University, Taipei, 11031, Taiwan.
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2
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Morgan LM, Loche D, Corrias A, Hayama S, Mountjoy G. Using Ex Situ and In Situ HERFD-XANES to Reveal the Superior Oxidation and Reduction Cycling of Ceria Nanocubes Dispersed in Silica Aerogel. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2023; 127:19554-19562. [PMID: 37817919 PMCID: PMC10561250 DOI: 10.1021/acs.jpcc.3c03785] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/05/2023] [Revised: 09/07/2023] [Indexed: 10/12/2023]
Abstract
The oxygen storage capacity of ceria-based catalytic materials is influenced by their size, morphology, and surface structure, which can be tuned using surfactant-mediated synthesis. In particular, the cuboidal morphology exposes the most reactive surfaces; however, when the capping agent is removed, the nanocubes can agglomerate and limit the available reactive surface. Here, we study ceria nanocubes, lanthanum-doped ceria nanocubes, and ceria nanocubes embedded inside a highly porous silica aerogel by high-energy resolution fluorescence detection-X-ray absorption near edge spectroscopy at the Ce L3 edge. In situ measurements showed an increased reversibility of redox cycles in ceria nanocubes when embedded in the aerogel, demonstrating enhanced reactivity due to the retention of reactive surfaces. These aerogel nanocomposites show greater improvement in the redox capacity and increased thermal stability of this catalytic material compared to the surfactant-capped nanocubes. Ex situ measurements were also performed to study the effect of lanthanum doping on the cerium oxidation state in the nanocubes, indicating a higher proportion of Ce4+ compared to that of the undoped ceria nanocubes.
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Affiliation(s)
- Lucy M. Morgan
- School
of Chemistry and Forensic Science, University
of Kent, Ingram Building, Canterbury CT2 7NH, U.K.
| | - Danilo Loche
- School
of Chemistry and Forensic Science, University
of Kent, Ingram Building, Canterbury CT2 7NH, U.K.
| | - Anna Corrias
- School
of Chemistry and Forensic Science, University
of Kent, Ingram Building, Canterbury CT2 7NH, U.K.
| | - Shusaku Hayama
- Diamond
Light Source, Harwell Science & Innovation
Campus, Didcot OX11 DE, U.K.
| | - Gavin Mountjoy
- School
of Physics and Astronomy, University of
Kent, Ingram Building, Canterbury CT2 7NH, U.K.
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3
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Wang G, Mine S, Chen D, Jing Y, Ting KW, Yamaguchi T, Takao M, Maeno Z, Takigawa I, Matsushita K, Shimizu KI, Toyao T. Accelerated discovery of multi-elemental reverse water-gas shift catalysts using extrapolative machine learning approach. Nat Commun 2023; 14:5861. [PMID: 37735169 PMCID: PMC10514199 DOI: 10.1038/s41467-023-41341-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2023] [Accepted: 08/28/2023] [Indexed: 09/23/2023] Open
Abstract
Designing novel catalysts is key to solving many energy and environmental challenges. Despite the promise that data science approaches, including machine learning (ML), can accelerate the development of catalysts, truly novel catalysts have rarely been discovered through ML approaches because of one of its most common limitations and criticisms-the assumed inability to extrapolate and identify extraordinary materials. Herein, we demonstrate an extrapolative ML approach to develop new multi-elemental reverse water-gas shift catalysts. Using 45 catalysts as the initial data points and performing 44 cycles of the closed loop discovery system (ML prediction + experiment), we experimentally tested a total of 300 catalysts and identified more than 100 catalysts with superior activity compared to those of the previously reported high-performance catalysts. The composition of the optimal catalyst discovered was Pt(3)/Rb(1)-Ba(1)-Mo(0.6)-Nb(0.2)/TiO2. Notably, niobium (Nb) was not included in the original dataset, and the catalyst composition identified was not predictable even by human experts.
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Affiliation(s)
- Gang Wang
- Institute for Catalysis, Hokkaido University, N-21, W-10, Sapporo, 001-0021, Japan
| | - Shinya Mine
- Institute for Catalysis, Hokkaido University, N-21, W-10, Sapporo, 001-0021, Japan
| | - Duotian Chen
- Institute for Catalysis, Hokkaido University, N-21, W-10, Sapporo, 001-0021, Japan
| | - Yuan Jing
- Institute for Catalysis, Hokkaido University, N-21, W-10, Sapporo, 001-0021, Japan
| | - Kah Wei Ting
- Institute for Catalysis, Hokkaido University, N-21, W-10, Sapporo, 001-0021, Japan
| | - Taichi Yamaguchi
- Institute for Catalysis, Hokkaido University, N-21, W-10, Sapporo, 001-0021, Japan
| | - Motoshi Takao
- Institute for Catalysis, Hokkaido University, N-21, W-10, Sapporo, 001-0021, Japan
| | - Zen Maeno
- School of Advanced Engineering, Kogakuin University, 2665-1, Nakano-cho, Hachioji, 192-0015, Japan
| | - Ichigaku Takigawa
- RIKEN Center for Advanced Intelligence Project, 1-4-1 Nihonbashi, Chuo-ku, Tokyo, 103-0027, Japan.
- Institute for Chemical Reaction Design and Discovery (WPI-ICReDD), Hokkaido University, N-21, W-10, Sapporo, 001-0021, Japan.
- Institute for Liberal Arts and Sciences, Kyoto University, 69-302, Yoshida-Konoe-cho, Sakyo-ku, Kyoto, 606-8315, Japan.
| | - Koichi Matsushita
- Central Technical Research Laboratory, ENEOS Corporation, 8, Chidori-cho, Naka-ku, Yokohama, 231-0815, Japan
| | - Ken-Ichi Shimizu
- Institute for Catalysis, Hokkaido University, N-21, W-10, Sapporo, 001-0021, Japan.
| | - Takashi Toyao
- Institute for Catalysis, Hokkaido University, N-21, W-10, Sapporo, 001-0021, Japan.
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4
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Saurette EM, Frinfrock YZ, Verbuyst B, Blowes DW, McBeth JM, Ptacek CJ. Improved precision in As speciation analysis with HERFD-XANES at the As K-edge: the case of As speciation in mine waste. JOURNAL OF SYNCHROTRON RADIATION 2022; 29:1198-1208. [PMID: 36073878 PMCID: PMC9455218 DOI: 10.1107/s1600577522007068] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/25/2021] [Accepted: 07/09/2022] [Indexed: 06/15/2023]
Abstract
High-energy-resolution fluorescence-detected (HERFD) X-ray absorption near-edge spectroscopy (XANES) is a spectroscopic method that allows for increased spectral feature resolution, and greater selectivity to decrease complex matrix effects compared with conventional XANES. XANES is an ideal tool for speciation of elements in solid-phase environmental samples. Accurate speciation of As in mine waste materials is important for understanding the mobility and toxicity of As in near-surface environments. In this study, linear combination fitting (LCF) was performed on synthetic spectra generated from mixtures of eight measured reference compounds for both HERFD-XANES and transmission-detected XANES to evaluate the improvement in quantitative speciation with HERFD-XANES spectra. The reference compounds arsenolite (As2O3), orpiment (As2S3), getchellite (AsSbS3), arsenopyrite (FeAsS), kaňkite (FeAsO4·3.5H2O), scorodite (FeAsO4·2H2O), sodium arsenate (Na3AsO4), and realgar (As4S4) were selected for their importance in mine waste systems. Statistical methods of principal component analysis and target transformation were employed to determine whether HERFD improves identification of the components in a dataset of mixtures of reference compounds. LCF was performed on HERFD- and total fluorescence yield (TFY)-XANES spectra collected from mine waste samples. Arsenopyrite, arsenolite, orpiment, and sodium arsenate were more accurately identified in the synthetic HERFD-XANES spectra compared with the transmission-XANES spectra. In mine waste samples containing arsenopyrite and either scorodite or kaňkite, LCF with HERFD-XANES measurements resulted in fits with smaller R-factors than concurrently collected TFY measurements. The improved accuracy of HERFD-XANES analysis may provide enhanced delineation of As phases controlling biogeochemical reactions in mine wastes, contaminated soils, and remediation systems.
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Affiliation(s)
- Emily M. Saurette
- Department of Earth and Environmental Sciences, University of Waterloo, Waterloo, ON, Canada
| | - Y. Zou Frinfrock
- Structural Biology Center, Advanced Photon Source, Argonne National Laboratory, 9700 South Cass Avenue, Lemont, IL 60439, USA
| | - Brent Verbuyst
- Department of Earth and Environmental Sciences, University of Waterloo, Waterloo, ON, Canada
| | - David W. Blowes
- Department of Earth and Environmental Sciences, University of Waterloo, Waterloo, ON, Canada
| | - Joyce M. McBeth
- Department of Geology, University of Regina, Regina, SK, Canada
| | - Carol J. Ptacek
- Department of Earth and Environmental Sciences, University of Waterloo, Waterloo, ON, Canada
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5
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Solovyev M, Kucheryavy P, Lockard JV. Local Coordination and Electronic Structure Ramifications of Guest-Dependent Spin Crossover in a Metal-Organic Framework: A Combined X-ray Absorption and Emission Spectroscopy Study. Inorg Chem 2022; 61:9213-9223. [PMID: 35678726 DOI: 10.1021/acs.inorgchem.2c00774] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The porous Hoffman-type 3D lattice Fe(pz)[NiII(CN)4] exhibits thermally induced spin-crossover (SCO) behavior that is dependent on the solvent guest species occupying the pores. Here, in situ Fe K-edge X-ray absorption spectroscopy (XAS) and both non-resonant and resonant Kβ X-ray emission spectroscopy (XES) methods are used to probe this framework under two solvent environments that yield different extremes of spin crossover temperature: acetonitrile and toluene. While the acetonitrile pore environment engenders an SCO response around room temperature, toluene guests stabilize the high spin state and effectively suppress SCO behavior throughout the ambient temperature range. The multipronged X-ray spectroscopy approach simultaneously confirmed this spin crossover behavior and provided new local coordination and electronic structural insights of the framework under these two solvent environments. Extended X-ray absorption fine structure analysis revealed spin state and solvent guest-dependent differences in coordination bond lengths and structural disorder. Resonant XES measurements produced high-resolution XAS spectra with distinct pre-edge and edge features, whose assignment was established using both simple ligand field theory and time-dependent density-functional theory calculations and further supported by their observed resonance behavior in the 2D RXES plane. Edge feature variation with the Fe spin state was interpreted to reveal changes in specific metal-linker bond covalency.
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Affiliation(s)
- Mikhail Solovyev
- Department of Chemistry, Rutgers University─Newark, 73 Warren Street, Newark, New Jersey 07102, United States
| | - Pavel Kucheryavy
- Department of Chemistry, Rutgers University─Newark, 73 Warren Street, Newark, New Jersey 07102, United States
| | - Jenny V Lockard
- Department of Chemistry, Rutgers University─Newark, 73 Warren Street, Newark, New Jersey 07102, United States
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6
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KIKKAWA S, Teramura K, Kato K, Asakura H, Hosokawa S, Tanaka T. Formation of CH4 at Metal–Support Interface of Pt/Al2O3 During Hydrogenation of CO2: Operando XAS‐DRIFTS Study. ChemCatChem 2022. [DOI: 10.1002/cctc.202101723] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Soichi KIKKAWA
- Tokyo Metropolitan University Graduate School and Faculty of Science: Tokyo Toritsu Daigaku Rigakubu Daigakuin Rigaku Kenkyuka Chemistry 1-1 Minami-Osawa 192-0397 Hachioji JAPAN
| | - Kentaro Teramura
- Kyoto University Department of Molecular Engineering, Graduate School of Engineering Kyotodaigaku Katsura 615-8510 Kyoto JAPAN
| | - Kazuo Kato
- Japan Synchrotron Radiation Research Institute, SPring-8 Center for Synchrotron Radiation Research JAPAN
| | - Hiroyuki Asakura
- Kyoto University Faculty of Engineering Graduate School of Engineering: Kyoto Daigaku Kogakubu Daigakuin Kogaku Kenkyuka Department of Molecular Engineering JAPAN
| | - Saburo Hosokawa
- Kyoto University Faculty of Engineering Graduate School of Engineering: Kyoto Daigaku Kogakubu Daigakuin Kogaku Kenkyuka Department of Molecular Engineering JAPAN
| | - Tsunehiro Tanaka
- Kyoto University Faculty of Engineering Graduate School of Engineering: Kyoto Daigaku Kogakubu Daigakuin Kogaku Kenkyuka Department of Molecular Engineering JAPAN
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7
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Yang Y, Peltier CR, Zeng R, Schimmenti R, Li Q, Huang X, Yan Z, Potsi G, Selhorst R, Lu X, Xu W, Tader M, Soudackov AV, Zhang H, Krumov M, Murray E, Xu P, Hitt J, Xu L, Ko HY, Ernst BG, Bundschu C, Luo A, Markovich D, Hu M, He C, Wang H, Fang J, DiStasio RA, Kourkoutis LF, Singer A, Noonan KJT, Xiao L, Zhuang L, Pivovar BS, Zelenay P, Herrero E, Feliu JM, Suntivich J, Giannelis EP, Hammes-Schiffer S, Arias T, Mavrikakis M, Mallouk TE, Brock JD, Muller DA, DiSalvo FJ, Coates GW, Abruña HD. Electrocatalysis in Alkaline Media and Alkaline Membrane-Based Energy Technologies. Chem Rev 2022; 122:6117-6321. [PMID: 35133808 DOI: 10.1021/acs.chemrev.1c00331] [Citation(s) in RCA: 89] [Impact Index Per Article: 44.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Hydrogen energy-based electrochemical energy conversion technologies offer the promise of enabling a transition of the global energy landscape from fossil fuels to renewable energy. Here, we present a comprehensive review of the fundamentals of electrocatalysis in alkaline media and applications in alkaline-based energy technologies, particularly alkaline fuel cells and water electrolyzers. Anion exchange (alkaline) membrane fuel cells (AEMFCs) enable the use of nonprecious electrocatalysts for the sluggish oxygen reduction reaction (ORR), relative to proton exchange membrane fuel cells (PEMFCs), which require Pt-based electrocatalysts. However, the hydrogen oxidation reaction (HOR) kinetics is significantly slower in alkaline media than in acidic media. Understanding these phenomena requires applying theoretical and experimental methods to unravel molecular-level thermodynamics and kinetics of hydrogen and oxygen electrocatalysis and, particularly, the proton-coupled electron transfer (PCET) process that takes place in a proton-deficient alkaline media. Extensive electrochemical and spectroscopic studies, on single-crystal Pt and metal oxides, have contributed to the development of activity descriptors, as well as the identification of the nature of active sites, and the rate-determining steps of the HOR and ORR. Among these, the structure and reactivity of interfacial water serve as key potential and pH-dependent kinetic factors that are helping elucidate the origins of the HOR and ORR activity differences in acids and bases. Additionally, deliberately modulating and controlling catalyst-support interactions have provided valuable insights for enhancing catalyst accessibility and durability during operation. The design and synthesis of highly conductive and durable alkaline membranes/ionomers have enabled AEMFCs to reach initial performance metrics equal to or higher than those of PEMFCs. We emphasize the importance of using membrane electrode assemblies (MEAs) to integrate the often separately pursued/optimized electrocatalyst/support and membranes/ionomer components. Operando/in situ methods, at multiscales, and ab initio simulations provide a mechanistic understanding of electron, ion, and mass transport at catalyst/ionomer/membrane interfaces and the necessary guidance to achieve fuel cell operation in air over thousands of hours. We hope that this Review will serve as a roadmap for advancing the scientific understanding of the fundamental factors governing electrochemical energy conversion in alkaline media with the ultimate goal of achieving ultralow Pt or precious-metal-free high-performance and durable alkaline fuel cells and related technologies.
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Affiliation(s)
- Yao Yang
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853, United States
| | - Cheyenne R Peltier
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853, United States
| | - Rui Zeng
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853, United States
| | - Roberto Schimmenti
- Department of Chemical and Biological Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States
| | - Qihao Li
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, China
| | - Xin Huang
- School of Applied and Engineering Physics, Cornell University, Ithaca, New York 14853, United States
| | - Zhifei Yan
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Georgia Potsi
- Department of Materials Science and Engineering, Cornell University, Ithaca, New York 14853, United States
| | - Ryan Selhorst
- Department of Chemistry, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States
| | - Xinyao Lu
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853, United States
| | - Weixuan Xu
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853, United States
| | - Mariel Tader
- Department of Physics, Cornell University, Ithaca, New York 14853, United States
| | - Alexander V Soudackov
- Department of Chemistry, Yale University, New Haven, Connecticut 06520, United States
| | - Hanguang Zhang
- Materials Physics and Applications Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
| | - Mihail Krumov
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853, United States
| | - Ellen Murray
- Department of Chemical and Biological Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States
| | - Pengtao Xu
- Department of Materials Science and Engineering, Cornell University, Ithaca, New York 14853, United States
| | - Jeremy Hitt
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Linxi Xu
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Hsin-Yu Ko
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853, United States
| | - Brian G Ernst
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853, United States
| | - Colin Bundschu
- Department of Physics, Cornell University, Ithaca, New York 14853, United States
| | - Aileen Luo
- Department of Materials Science and Engineering, Cornell University, Ithaca, New York 14853, United States
| | - Danielle Markovich
- School of Applied and Engineering Physics, Cornell University, Ithaca, New York 14853, United States
| | - Meixue Hu
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, China
| | - Cheng He
- Chemical and Materials Science Center, National Renewable Energy Laboratory, Golden, Colorado 80401, United States
| | - Hongsen Wang
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853, United States
| | - Jiye Fang
- Department of Chemistry, State University of New York at Binghamton, Binghamton, New York 13902, United States
| | - Robert A DiStasio
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853, United States
| | - Lena F Kourkoutis
- School of Applied and Engineering Physics, Cornell University, Ithaca, New York 14853, United States.,Kavli Institute at Cornell for Nanoscale Science, Cornell University, Ithaca, New York 14853, United States
| | - Andrej Singer
- Department of Materials Science and Engineering, Cornell University, Ithaca, New York 14853, United States
| | - Kevin J T Noonan
- Department of Chemistry, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States
| | - Li Xiao
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, China
| | - Lin Zhuang
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, China
| | - Bryan S Pivovar
- Chemical and Materials Science Center, National Renewable Energy Laboratory, Golden, Colorado 80401, United States
| | - Piotr Zelenay
- Materials Physics and Applications Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
| | - Enrique Herrero
- Instituto de Electroquímica, Universidad de Alicante, Alicante E-03080, Spain
| | - Juan M Feliu
- Instituto de Electroquímica, Universidad de Alicante, Alicante E-03080, Spain
| | - Jin Suntivich
- Department of Materials Science and Engineering, Cornell University, Ithaca, New York 14853, United States.,Kavli Institute at Cornell for Nanoscale Science, Cornell University, Ithaca, New York 14853, United States
| | - Emmanuel P Giannelis
- Department of Materials Science and Engineering, Cornell University, Ithaca, New York 14853, United States
| | | | - Tomás Arias
- Department of Physics, Cornell University, Ithaca, New York 14853, United States
| | - Manos Mavrikakis
- Department of Chemical and Biological Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States
| | - Thomas E Mallouk
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Joel D Brock
- School of Applied and Engineering Physics, Cornell University, Ithaca, New York 14853, United States
| | - David A Muller
- School of Applied and Engineering Physics, Cornell University, Ithaca, New York 14853, United States.,Kavli Institute at Cornell for Nanoscale Science, Cornell University, Ithaca, New York 14853, United States
| | - Francis J DiSalvo
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853, United States
| | - Geoffrey W Coates
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853, United States
| | - Héctor D Abruña
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853, United States.,Center for Alkaline Based Energy Solutions (CABES), Cornell University, Ithaca, New York 14853, United States
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8
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Dynamic Pt Coordination in Dilute AgPt Alloy Nanoparticle Catalysts Under Reactive Environments. Top Catal 2022. [DOI: 10.1007/s11244-021-01545-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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9
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Hua J, Fei YH, Feng C, Liu C, Liang S, Wang SL, Wu F. Anoxic oxidation of As(III) during Fe(II)-induced goethite recrystallization: Evidence and importance of Fe(IV) intermediate. JOURNAL OF HAZARDOUS MATERIALS 2022; 421:126806. [PMID: 34388930 DOI: 10.1016/j.jhazmat.2021.126806] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/21/2021] [Revised: 07/27/2021] [Accepted: 07/30/2021] [Indexed: 06/13/2023]
Abstract
Under anoxic conditions, aqueous Fe(II) (Fe(II)aq)-induced recrystallization of iron (oxyhydr)oxides changes the speciation and geochemical cycle of trace elements in environments. Oxidation of trace element, i.e., As(III), driven by Fe(II)aq-iron (oxyhydr)oxides interactions under anoxic condition was observed previously, but the oxidative species and involved mechanisms are remained unknown. In the present study, we explored the formed oxidative intermediates during Fe(II)aq-induced recrystallization of goethite under anoxic conditions. The methyl phenyl sulfoxide-based probe experiment suggested the featured oxidation by Fe(IV) species in Fe(II)aq-goethite system. Both the Mössbauer spectra and X-ray absorption near edge structure spectroscopic evidenced the generation and quenching of Fe(IV) intermediate. It was proved that the interfacial electron exchange between Fe(II)aq and Fe(III) of goethite initiated the generation of Fe(IV). After transferring electrons to goethite, Fe(II)aq was transformed to labile Fe(III), which was then transformed to Fe(IV) via a proton-coupled electron transfer process. This highly reactive transient Fe(IV) could quickly react with reductive species, i.e. Fe(II) or As(III). Considering the ubiquitous occurrence of Fe(II)-iron (oxyhydr)oxides reactions under anoxic conditions, our findings are expected to provide new insight into the anoxic oxidative transformation processes of matters in non-surface environments on earth.
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Affiliation(s)
- Jian Hua
- School of Resources and Environmental Science, Wuhan University, Wuhan 430079, China; State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
| | - Ying-Heng Fei
- School of Environmental Science and Engineering, Guangzhou University, Guangzhou 510006, China
| | - Chunhua Feng
- School of Environment and Energy, South China University of Technology, Guangzhou 510006, China
| | - Chengshuai Liu
- State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China; Guangdong Institute of Eco-environmental Science & Technology, Guangdong Academy of Sciences, Guangzhou 510650, China.
| | - Sheng Liang
- School of Environment and Energy, South China University of Technology, Guangzhou 510006, China
| | - Shan-Li Wang
- Department of Agricultural Chemistry, National Taiwan University, Taipei 10617, Taiwan
| | - Feng Wu
- School of Resources and Environmental Science, Wuhan University, Wuhan 430079, China
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10
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Yamasaki T, Nishida A, Suganuma N, Song Y, Li X, Murakami J, Kodaira T, Bando KK, Ishihara T, Shishido T, Takagaki A. Low-Temperature Activation of Methane with Nitric Oxide and Formation of Hydrogen Cyanide over an Alumina-Supported Platinum Catalyst. ACS Catal 2021. [DOI: 10.1021/acscatal.1c04548] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- Tatsuya Yamasaki
- Department of Applied Chemistry, Faculty of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Atsushi Nishida
- Department of Applied Chemistry for Environment, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1 Minami-osawa, Hachioji, Tokyo 192-0397, Japan
| | - Nobuya Suganuma
- Department of Applied Chemistry for Environment, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1 Minami-osawa, Hachioji, Tokyo 192-0397, Japan
| | - Yang Song
- Graduate School of Environmental Engineering, The University of Kitakyushu, 1-1, Hibikino, Kitakyushu, Fukuoka 808-0135, Japan
| | - Xiaohong Li
- Graduate School of Environmental Engineering, The University of Kitakyushu, 1-1, Hibikino, Kitakyushu, Fukuoka 808-0135, Japan
| | - Junichi Murakami
- Nanomaterials Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1, Higashi, Tsukuba, Ibaraki 305-8565, Japan
| | - Tetsuya Kodaira
- Research Institute for Chemical Process Technology, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1, Higashi, Tsukuba, Ibaraki 305-8565, Japan
| | - Kyoko K. Bando
- Nanomaterials Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1, Higashi, Tsukuba, Ibaraki 305-8565, Japan
| | - Tatsumi Ishihara
- Department of Applied Chemistry, Faculty of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
- International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Tetsuya Shishido
- Department of Applied Chemistry for Environment, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1 Minami-osawa, Hachioji, Tokyo 192-0397, Japan
- Elements Strategy Initiative for Catalysts and Batteries, Kyoto University, 1-30 Goryo-Ohara, Nishikyo-ku, Kyoto 615-8245, Japan
| | - Atsushi Takagaki
- Department of Applied Chemistry, Faculty of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
- International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
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11
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Li X, Wang X, Sadykov II, Palagin D, Safonova OV, Li J, Beck A, Krumeich F, van Bokhoven JA, Artiglia L. Temperature and Reaction Environment Influence the Nature of Platinum Species Supported on Ceria. ACS Catal 2021. [DOI: 10.1021/acscatal.1c03165] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Xiansheng Li
- Institute for Chemical and Bioengineering, Department of Chemistry and Applied Biosciences, ETH Zurich, 8093 Zurich, Switzerland
- Laboratory for Catalysis and Sustainable Chemistry, Paul Scherrer Institute, 5232 Villigen, Switzerland
| | - Xing Wang
- Institute for Chemical and Bioengineering, Department of Chemistry and Applied Biosciences, ETH Zurich, 8093 Zurich, Switzerland
- Laboratory for Catalysis and Sustainable Chemistry, Paul Scherrer Institute, 5232 Villigen, Switzerland
| | - Ilia I. Sadykov
- Institute for Chemical and Bioengineering, Department of Chemistry and Applied Biosciences, ETH Zurich, 8093 Zurich, Switzerland
- Laboratory for Operando Spectroscopy, Paul Scherrer Institute, 5232 Villigen, Switzerland
| | - Dennis Palagin
- Laboratory for Catalysis and Sustainable Chemistry, Paul Scherrer Institute, 5232 Villigen, Switzerland
| | - Olga V. Safonova
- Laboratory for Operando Spectroscopy, Paul Scherrer Institute, 5232 Villigen, Switzerland
| | - Junhua Li
- School of Environment, Tsinghua University, 100084 Beijing,, China
| | - Arik Beck
- Institute for Chemical and Bioengineering, Department of Chemistry and Applied Biosciences, ETH Zurich, 8093 Zurich, Switzerland
| | - Frank Krumeich
- Institute for Chemical and Bioengineering, Department of Chemistry and Applied Biosciences, ETH Zurich, 8093 Zurich, Switzerland
| | - Jeroen A. van Bokhoven
- Institute for Chemical and Bioengineering, Department of Chemistry and Applied Biosciences, ETH Zurich, 8093 Zurich, Switzerland
- Laboratory for Catalysis and Sustainable Chemistry, Paul Scherrer Institute, 5232 Villigen, Switzerland
| | - Luca Artiglia
- Laboratory for Catalysis and Sustainable Chemistry, Paul Scherrer Institute, 5232 Villigen, Switzerland
- Laboratory of Environmental Chemistry, Paul Scherrer Institute, 5232 Villigen, Switzerland
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12
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Iglesias‐Juez A, Chiarello GL, Patience GS, Guerrero‐Pérez MO. Experimental methods in chemical engineering:
X
‐ray absorption spectroscopy—
XAS
,
XANES
,
EXAFS. CAN J CHEM ENG 2021. [DOI: 10.1002/cjce.24291] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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13
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Solovyev MA, Lockard JV, Huang X, Heald SM, Sun CJ. High resolution x-ray emission spectrometer for multiple hard x-ray emission lines: Demonstration for Cu Kα and Kβ emissions. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2021; 92:073105. [PMID: 34340408 DOI: 10.1063/5.0048726] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/25/2021] [Accepted: 06/20/2021] [Indexed: 06/13/2023]
Abstract
We present a compact 3D printed x-ray emission spectrometer based on the von Hamos geometry that represents a significant upgrade to the existing von Hamos geometry-based miniature x-ray emission spectrometer (miniXES) [Mattern et al., Rev. Sci. Instrum. 83(2), 023901 (2012)]. The upgrades include the incorporation of a higher pixel density 500K detector for improved energy resolution and an enlarged sample area to accommodate a wider range of sample formats. The versatile spectrometer houses removable crystal holders that can be easily exchanged, as well as movable alignment eyelets that give flexibility in Bragg angle selection. Designed for ease of manufacture, all the components, except for the apertures, can be 3D printed and readily assembled. We describe its implementation in measurements of resonant and non-resonant Cu Kα and Kβ x-ray emission and report the theoretical and measured energy resolution and collected solid angle of the emission.
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Affiliation(s)
- Mikhail A Solovyev
- Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | | | - XianRong Huang
- Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - Steve M Heald
- Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - Cheng-Jun Sun
- Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA
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14
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Celorrio V, Leach AS, Huang H, Hayama S, Freeman A, Inwood DW, Fermin DJ, Russell AE. Relationship between Mn Oxidation State Changes and Oxygen Reduction Activity in (La,Ca)MnO 3 as Probed by In Situ XAS and XES. ACS Catal 2021. [DOI: 10.1021/acscatal.1c00997] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Veronica Celorrio
- Diamond Light Source Ltd, Diamond House. Harwell Campus, Didcot OX11 0DE, U.K
| | - Andrew S. Leach
- School of Chemistry, University of Southampton, Highfield, Southampton SO17 1BJ, U.K
| | - Haoliang Huang
- School of Chemistry, University of Southampton, Highfield, Southampton SO17 1BJ, U.K
| | - Shusaku Hayama
- Diamond Light Source Ltd, Diamond House. Harwell Campus, Didcot OX11 0DE, U.K
| | - Adam Freeman
- Diamond Light Source Ltd, Diamond House. Harwell Campus, Didcot OX11 0DE, U.K
| | - David W. Inwood
- School of Chemistry, University of Southampton, Highfield, Southampton SO17 1BJ, U.K
| | - David J. Fermin
- School of Chemistry, University of Bristol, Cantocks Close, Bristol BS8 1TS, U.K
| | - Andrea E. Russell
- School of Chemistry, University of Southampton, Highfield, Southampton SO17 1BJ, U.K
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15
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Insights into the Structural Dynamics of Pt/CeO2 Single-Site Catalysts during CO Oxidation. Catalysts 2021. [DOI: 10.3390/catal11050617] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
Despite their high atomic dispersion, single site catalysts with Pt supported on CeO2 were found to have a low activity during oxidation reactions. In this study, we report the behavior of Pt/CeO2 single site catalyst under more complex gas mixtures, including CO, C3H6 and CO/C3H6 oxidation in the absence or presence of water. Our systematic operando high-energy resolution-fluorescence-detected X-ray absorption near-edge structure (HERFD-XANES) spectroscopic study combined with multivariate curve resolution with alternating least squares (MCR-ALS) analysis identified five distinct states in the Pt single site structure during CO oxidation light-off. After desorption of oxygen and autoreduction of Pt4+ to Pt2+ due to the increase of temperature, CO adsorbs and reduces Pt2+ to Ptδ+ and assists its migration with final formation of PtxΔ+ clusters. The derived structure–activity relationships indicate that partial reduction of Pt single sites is not sufficient to initiate the conversion of CO. The reaction proceeds only after the regrouping of several noble metal atoms in small clusters, as these entities are probably able to influence the mobility of the oxygen at the interface with ceria.
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16
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Berger G, Wach A, Sá J, Szlachetko J. Reduction Mechanisms of Anticancer Osmium(VI) Complexes Revealed by Atomic Telemetry and Theoretical Calculations. Inorg Chem 2021; 60:6663-6671. [PMID: 33871984 DOI: 10.1021/acs.inorgchem.1c00467] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Resonant X-ray emission spectroscopy (RXES) has developed in the past decade as a powerful tool to probe the chemical state of a metal center and in situ study chemical reactions. We have used it to monitor spectral changes associated with the reduction of osmium(VI) nitrido complexes to the osmium(III) ammine state by the biologically relevant reducing agent, glutathione. RXES difference maps are consistent with the proposed DFT mechanism and the formation of two stable osmium(IV) intermediates, thereby supporting the overall pathway for the reduction of these high-valent anticancer metal complexes for which reduction by thiols within cells may be essential to the antiproliferative activity.
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Affiliation(s)
- Gilles Berger
- Microbiology, Bioorganic & Macromolecular Chemistry, Faculty of Pharmacy, Université Libre de Bruxelles, 1050 Brussels, Belgium.,Harvey Cushing Neuro-Oncology Laboratories, Department of Neurosurgery, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts 02115, United States.,Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Anna Wach
- Institute of Nuclear Physics, Polish Academy of Sciences, 31342 Krakow, Poland
| | - Jacinto Sá
- Institute of Physical Chemistry, Polish Academy of Sciences, 01-224 Warsaw, Poland.,Physical Chemistry Division, Department of Chemistry, Ångström Laboratory, Uppsala University, 75120 Uppsala, Sweden
| | - Jakub Szlachetko
- Institute of Nuclear Physics, Polish Academy of Sciences, 31342 Krakow, Poland
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17
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Lais T, Lukashuk L, van de Water L, Hyde TI, Aramini M, Sankar G. Elucidation of copper environment in a Cu-Cr-Fe oxide catalyst through in situ high-resolution XANES investigation. Phys Chem Chem Phys 2021; 23:5888-5896. [PMID: 33660717 DOI: 10.1039/d0cp06468h] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Copper containing materials are widely used in a range of catalytic applications. Here, we report the use of Cu K-edge high resolution XANES to determine the local site symmetry of copper ions during the thermal treatment of a Cu-Cr-Fe oxide catalyst. We exploited the Cu K-edge XANES spectral features, in particular the correlation between area under the pre-edge peak and its position to determine the local environment of Cu2+ ions. The information gained from this investigation rules out the presence of Cu2+ ions in a tetrahedral or square planar geometry, a mixture of these sites, or in a reduced oxidation state. Evidence is presented that the Cu2+ ions in the Cu-Cr-Fe oxide system are present in a distorted octahedral environment.
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Affiliation(s)
- Tahmin Lais
- Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, UK.
| | - Liliana Lukashuk
- Johnson Matthey, PO Box 1, Belasis Avenue, Billingham, Cleveland TS23 1LB, UK
| | - Leon van de Water
- Johnson Matthey, PO Box 1, Belasis Avenue, Billingham, Cleveland TS23 1LB, UK
| | - Timothy I Hyde
- Johnson Matthey, Blounts Court, Sonning Common, Reading, RG4 9NH, UK
| | - Matteo Aramini
- Diamond Light Source, Harwell Science & Innovation Campus, Oxfordshire OX11 0DE, UK
| | - Gopinathan Sankar
- Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, UK.
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18
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Klaes J, Rothweiler P, Bornmann B, Wagner R, Lützenkirchen-Hecht D. High-temperature treatments of niobium under high vacuum, dilute air- and nitrogen-atmospheres as investigated by in situ X-ray absorption spectroscopy. JOURNAL OF SYNCHROTRON RADIATION 2021; 28:266-277. [PMID: 33399577 PMCID: PMC7842222 DOI: 10.1107/s1600577520013557] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/10/2020] [Accepted: 10/09/2020] [Indexed: 06/12/2023]
Abstract
Niobium metal foils were heat-treated at 900°C under different conditions and in situ investigated with time-resolved X-ray absorption fine-structure (EXAFS and XANES) measurements. The present study aims to mimic the conditions usually applied for heat treatments of Nb materials used for superconducting radiofrequency cavities, in order to better understand the evolving processes during vacuum annealing as well as for heat treatments in controlled dilute gases. Annealing in vacuum in a commercially available cell showed a substantial amount of oxidation, so that a designated new cell was designed and realized, allowing treatments under clean high-vacuum conditions as well as under well controllable gas atmospheres. The experiments performed under vacuum demonstrated that the original structure of the Nb foils is preserved, while a detailed evaluation of the X-ray absorption fine-structure data acquired during treatments in dilute air atmospheres (10-5 mbar to 10-3 mbar) revealed a linear oxidation with the time of the treatment, and an oxidation rate proportional to the oxygen (air) pressure. The structure of the oxide appears to be very similar to that of polycrystalline NbO. The cell also permits controlled exposures to other reactive gases at elevated temperatures; here the Nb foils were exposed to dilute nitrogen atmospheres after a pre-conditioning of the studied Nb material for one hour under high-vacuum conditions, in order to imitate typical conditions used for nitrogen doping of cavity materials. Clear structural changes induced by the N2 exposure were found; however, no evidence for the formation of niobium nitride could be derived from the EXAFS and XANES experiments. The presented results establish the feasibility to study the structural changes of the Nb materials in situ during heat treatments in reactive gases with temporal resolution, which are important to better understand the underlaying mechanisms and the dynamics of phase formation during those heat treatments in more detail.
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Affiliation(s)
- Jonas Klaes
- Fakultät 4 – Mathematik und Naturwissenschaften, Bergische Universität Wuppertal, Gauß-Straße 20, 42097 Wuppertal, Germany
| | - Patrick Rothweiler
- Fakultät 4 – Mathematik und Naturwissenschaften, Bergische Universität Wuppertal, Gauß-Straße 20, 42097 Wuppertal, Germany
| | - Benjamin Bornmann
- Fakultät 4 – Mathematik und Naturwissenschaften, Bergische Universität Wuppertal, Gauß-Straße 20, 42097 Wuppertal, Germany
| | - Ralph Wagner
- Fakultät 4 – Mathematik und Naturwissenschaften, Bergische Universität Wuppertal, Gauß-Straße 20, 42097 Wuppertal, Germany
| | - Dirk Lützenkirchen-Hecht
- Fakultät 4 – Mathematik und Naturwissenschaften, Bergische Universität Wuppertal, Gauß-Straße 20, 42097 Wuppertal, Germany
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19
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20
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van Haandel L, Smolentsev G, van Bokhoven JA, Hensen EJ, Weber T. Evidence of Octahedral Co–Mo–S Sites in Hydrodesulfurization Catalysts as Determined by Resonant Inelastic X-ray Scattering and X-ray Absorption Spectroscopy. ACS Catal 2020. [DOI: 10.1021/acscatal.0c03062] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Lennart van Haandel
- Eindhoven University of Technology, Het Kranenveld 14, Eindhoven 5600 MB, The Netherlands
| | | | | | - Emiel J.M. Hensen
- Eindhoven University of Technology, Het Kranenveld 14, Eindhoven 5600 MB, The Netherlands
| | - Thomas Weber
- Eindhoven University of Technology, Het Kranenveld 14, Eindhoven 5600 MB, The Netherlands
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21
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Chen WT, Hsu CW, Lee JF, Pao CW, Hsu IJ. Theoretical Analysis of Fe K-Edge XANES on Iron Pentacarbonyl. ACS OMEGA 2020; 5:4991-5000. [PMID: 32201785 PMCID: PMC7081404 DOI: 10.1021/acsomega.9b03887] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/14/2019] [Accepted: 02/21/2020] [Indexed: 05/21/2023]
Abstract
Iron pentacarbonyl (Fe(CO)5) is a versatile material that is utilized as an inhibitor of flame, shows soot suppressibility, and is used as a precursor for focused electron-beam-induced deposition (FEBID). X-ray absorption near-edge structure (XANES) of the K edge, which is a powerful technique for monitoring the oxidation states and coordination environment of metal sites, can be used to gain insight into Fe(CO)5-related reaction mechanisms in in situ experiments. We use a finite difference method (FDM) and molecular-orbital-based time-dependent density functional theory (TDDFT) calculations to clarify the Fe K-edge XANES features of Fe(CO)5. The two pre-edge peaks P1 and P2 are mainly the Fe(1s) → Fe-C(σ*) and Fe(1s) → Fe-C(π*) transitions, respectively. When the geometry transformed from D 3h to C 4v symmetry, a ∼30% decrease of the pre-edge P2 intensity was observed in the simulated spectra. This implies that the π bonding of Fe and CO is sensitive to changes in geometry. The following rising edge and white line regions are assigned to the Fe(1s) → Fe(4p)(mixing C(2p)) transitions. Our results may provide useful information to interpret XANES spectra variations of in situ reactions of metal-CO or similar compounds with π acceptor ligandlike metal-CN complexes.
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Affiliation(s)
- Wei-Ting Chen
- Department
of Molecular Science and Engineering, National
Taipei University of Technology, Taipei 10608, Taiwan
| | - Che-Wei Hsu
- Department
of Molecular Science and Engineering, National
Taipei University of Technology, Taipei 10608, Taiwan
| | - Jyh-Fu Lee
- National
Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - Chih-Wen Pao
- National
Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - I-Jui Hsu
- Department
of Molecular Science and Engineering, National
Taipei University of Technology, Taipei 10608, Taiwan
- Research
and Development Center for Smart Textile Technology, National Taipei University of Technology, Taipei 10608, Taiwan
- E-mail: .
Tel: +886-2-27712171#2420
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22
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Gänzler AM, Casapu M, Doronkin DE, Maurer F, Lott P, Glatzel P, Votsmeier M, Deutschmann O, Grunwaldt JD. Unravelling the Different Reaction Pathways for Low Temperature CO Oxidation on Pt/CeO 2 and Pt/Al 2O 3 by Spatially Resolved Structure-Activity Correlations. J Phys Chem Lett 2019; 10:7698-7705. [PMID: 31730353 DOI: 10.1021/acs.jpclett.9b02768] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Spatially resolved operando HERFD-XANES (high energy resolution fluorescence detected X-ray absorption near edge structure) complemented by CO concentration gradient profiles along the catalyst bed (SpaciPro) was used to identify the dominant reaction paths for the low and high temperature CO oxidation on Pt/CeO2 and Pt/Al2O3. At low temperatures, features associated with CO adsorption on Pt were found for both catalysts. During the oxidation reaction light-off, the evolution of the spectral and catalytic profile diverged along the catalyst bed. The CO oxidation rate was high on Pt/CeO2 from the beginning of the catalyst bed with CO being adsorbed on Pt, whereas low CO conversion due to strong CO poisoning was found on Pt/Al2O3. This correlation of the CO concentration gradient with unique insight by HERFD-XANES gave direct proof of the crucial contribution of the Pt-CeO2 perimeter sites overcoming the CO self-inhibition effect at low temperatures.
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Affiliation(s)
- Andreas M Gänzler
- Institute for Chemical Technology and Polymer Chemistry (ITCP) , Karlsruhe Institute of Technology (KIT) , Engesserstraße 20 , 76131 Karlsruhe , Germany
| | - Maria Casapu
- Institute for Chemical Technology and Polymer Chemistry (ITCP) , Karlsruhe Institute of Technology (KIT) , Engesserstraße 20 , 76131 Karlsruhe , Germany
| | - Dmitry E Doronkin
- Institute for Chemical Technology and Polymer Chemistry (ITCP) , Karlsruhe Institute of Technology (KIT) , Engesserstraße 20 , 76131 Karlsruhe , Germany
- Institute of Catalysis Research and Technology (IKFT) , Karlsruhe Institute of Technology (KIT) , Hermann-von-Helmholtz-Platz 1 , 76344 Eggenstein-Leopoldshafen , Germany
| | - Florian Maurer
- Institute for Chemical Technology and Polymer Chemistry (ITCP) , Karlsruhe Institute of Technology (KIT) , Engesserstraße 20 , 76131 Karlsruhe , Germany
| | - Patrick Lott
- Institute for Chemical Technology and Polymer Chemistry (ITCP) , Karlsruhe Institute of Technology (KIT) , Engesserstraße 20 , 76131 Karlsruhe , Germany
| | - Pieter Glatzel
- European Synchrotron Radiation Facility , 71 avenue des Martyrs CS 40220, 38000 Grenoble Cedex 9, France
| | - Martin Votsmeier
- Umicore AG & Co. KG , Rodenbacher Chaussee 4 , 63457 Hanau , Germany
| | - Olaf Deutschmann
- Institute for Chemical Technology and Polymer Chemistry (ITCP) , Karlsruhe Institute of Technology (KIT) , Engesserstraße 20 , 76131 Karlsruhe , Germany
- Institute of Catalysis Research and Technology (IKFT) , Karlsruhe Institute of Technology (KIT) , Hermann-von-Helmholtz-Platz 1 , 76344 Eggenstein-Leopoldshafen , Germany
| | - Jan-Dierk Grunwaldt
- Institute for Chemical Technology and Polymer Chemistry (ITCP) , Karlsruhe Institute of Technology (KIT) , Engesserstraße 20 , 76131 Karlsruhe , Germany
- Institute of Catalysis Research and Technology (IKFT) , Karlsruhe Institute of Technology (KIT) , Hermann-von-Helmholtz-Platz 1 , 76344 Eggenstein-Leopoldshafen , Germany
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23
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Steube J, Burkhardt L, Päpcke A, Moll J, Zimmer P, Schoch R, Wölper C, Heinze K, Lochbrunner S, Bauer M. Excited‐State Kinetics of an Air‐Stable Cyclometalated Iron(II) Complex. Chemistry 2019; 25:11826-11830. [DOI: 10.1002/chem.201902488] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2019] [Indexed: 11/07/2022]
Affiliation(s)
- Jakob Steube
- Institute of Inorganic Chemistry and Center for Sustainable, Systems Design (CSSD)University of Paderborn Warburger Straße 100 33098 Paderborn Germany
| | - Lukas Burkhardt
- Institute of Inorganic Chemistry and Center for Sustainable, Systems Design (CSSD)University of Paderborn Warburger Straße 100 33098 Paderborn Germany
| | - Ayla Päpcke
- Institute of Physics and Department of Life, Light and MatterUniversity of Rostock 18051 Rostock Germany
| | - Johannes Moll
- Institute of Inorganic Chemistry and Analytical ChemistryJohannes Gutenberg University Duesbergweg 10–14 55128 Mainz Germany
| | - Peter Zimmer
- Institute of Inorganic Chemistry and Center for Sustainable, Systems Design (CSSD)University of Paderborn Warburger Straße 100 33098 Paderborn Germany
| | - Roland Schoch
- Institute of Inorganic Chemistry and Center for Sustainable, Systems Design (CSSD)University of Paderborn Warburger Straße 100 33098 Paderborn Germany
| | - Christoph Wölper
- Institute for Inorganic Chemistry and Center for Nanointegration, Duisburg-Essen (Cenide)University of Duisburg-Essen Universitätsstraße 5-7 45117 Essen Germany
| | - Katja Heinze
- Institute of Inorganic Chemistry and Analytical ChemistryJohannes Gutenberg University Duesbergweg 10–14 55128 Mainz Germany
| | - Stefan Lochbrunner
- Institute of Physics and Department of Life, Light and MatterUniversity of Rostock 18051 Rostock Germany
| | - Matthias Bauer
- Institute of Inorganic Chemistry and Center for Sustainable, Systems Design (CSSD)University of Paderborn Warburger Straße 100 33098 Paderborn Germany
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24
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Lu Y, Wang J, Yu L, Kovarik L, Zhang X, Hoffman AS, Gallo A, Bare SR, Sokaras D, Kroll T, Dagle V, Xin H, Karim AM. Identification of the active complex for CO oxidation over single-atom Ir-on-MgAl2O4 catalysts. Nat Catal 2018. [DOI: 10.1038/s41929-018-0192-4] [Citation(s) in RCA: 164] [Impact Index Per Article: 27.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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25
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Kravtsova AN, Guda LV, Polozhentsev OE, Pankin IA, Soldatov AV. Xanes Specroscopic Diagnostics of the 3D Local Atomic Structure of Nanostructured Materials. J STRUCT CHEM+ 2018. [DOI: 10.1134/s0022476618070259] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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26
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Soldatov MA, Martini A, Bugaev AL, Pankin I, Medvedev PV, Guda AA, Aboraia AM, Podkovyrina YS, Budnyk AP, Soldatov AA, Lamberti C. The insights from X-ray absorption spectroscopy into the local atomic structure and chemical bonding of Metal–organic frameworks. Polyhedron 2018. [DOI: 10.1016/j.poly.2018.08.004] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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27
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Rudolph J, Jacob CR. Revisiting the Dependence of Cu K-Edge X-ray Absorption Spectra on Oxidation State and Coordination Environment. Inorg Chem 2018; 57:10591-10607. [PMID: 30113840 DOI: 10.1021/acs.inorgchem.8b01219] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
X-ray absorption spectroscopy (XAS) at the Cu K-edge is an important tool for probing the properties of copper centers in transition-metal chemistry and catalysis. However, the interpretation of experimental XAS spectra requires a detailed understanding of the dependence of spectroscopic features on the local geometric and electronic structure, which can be established by theoretical X-ray spectroscopy. Here, we present a systematic computational study of the Cu K-edge XAS spectra of selected Cu complexes based on time-dependent density-functional theory in combination with a molecular orbital analysis of the relevant transitions. For a series of Cu ammine model complexes as well as a comprehensive test set of 12 Cu(I) and 5 Cu(II) complexes, we revisit the dependence of the pre-edge region in Cu K-edge XAS spectra on oxidation state and coordination geometry. While our calculations confirm earlier experimental assignments, we can also reveal additional signatures of the ligand orbitals and identify the underlying orbital interactions. The comprehensive picture revealed by this study will provide a reliable basis for the interpretation of in situ Cu K-edge XAS spectra of catalytic intermediates.
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Affiliation(s)
- Julian Rudolph
- Institute of Physical and Theoretical Chemistry , TU Braunschweig , Gaußstraße 17 , 38106 Braunschweig , Germany
| | - Christoph R Jacob
- Institute of Physical and Theoretical Chemistry , TU Braunschweig , Gaußstraße 17 , 38106 Braunschweig , Germany
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28
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Goodwin CAP, Réant BLL, Kragskow JGC, DiMucci IM, Lancaster KM, Mills DP, Sproules S. Heteroleptic samarium(iii) halide complexes probed by fluorescence-detected L 3-edge X-ray absorption spectroscopy. Dalton Trans 2018; 47:10613-10625. [PMID: 29790545 PMCID: PMC6083822 DOI: 10.1039/c8dt01452c] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
The novel series of heteroleptic Sm(iii) halide complexes provides the backdrop for a fluorescence-detected Lα1 X-ray absorption spectroscopic study.
The addition of various oxidants to the near-linear Sm(ii) complex [Sm(N††)2] (1), where N†† is the bulky bis(triisopropylsilyl)amide ligand {N(SiiPr3)2}, afforded a family of heteroleptic three-coordinate Sm(iii) halide complexes, [Sm(N††)2(X)] (X = F, 2-F; Cl, 2-Cl; Br, 2-Br; I, 2-I). In addition, the trinuclear cluster [{Sm(N††)}3(μ2-I)3(μ3-I)2] (3), which formally contains one Sm(ii) and two Sm(iii) centres, was isolated during the synthesis of 2-I. Complexes 2-X are remarkably stable towards ligand redistribution, which is often a facile process for heteroleptic complexes of smaller monodentate ligands in lanthanide chemistry, including the related bis(trimethylsilyl)amide {N(SiMe3)2} (N′′). Complexes 2-X and 3 have been characterised by single crystal X-ray diffraction, elemental analysis, multinuclear NMR, FTIR and electronic spectroscopy. The Lα1 fluorescence-detected X-ray absorption spectra recorded at the Sm L3-edge for 2-X exhibited a resolved pre-edge peak defined as an envelope of quadrupole-allowed 2p → 4f transitions. The X-ray absorption spectral features were successfully reproduced using time-dependent density functional theoretical (TD-DFT) calculations that synergistically support the experimental observations as well as the theoretical model upon which the electronic structure and bonding in these lanthanide complexes is derived.
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Affiliation(s)
- Conrad A P Goodwin
- School of Chemistry, The University of Manchester, Oxford Road, Manchester M13 9PL, UK.
| | - Benjamin L L Réant
- School of Chemistry, The University of Manchester, Oxford Road, Manchester M13 9PL, UK.
| | - Jon G C Kragskow
- School of Chemistry, The University of Manchester, Oxford Road, Manchester M13 9PL, UK.
| | - Ida M DiMucci
- Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York, 14853, USA.
| | - Kyle M Lancaster
- Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York, 14853, USA.
| | - David P Mills
- School of Chemistry, The University of Manchester, Oxford Road, Manchester M13 9PL, UK.
| | - Stephen Sproules
- WestCHEM, School of Chemistry, The University of Glasgow, Glasgow G12 8QQ, UK.
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29
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Guda AA, Bugaev AL, Kopelent R, Braglia L, Soldatov AV, Nachtegaal M, Safonova OV, Smolentsev G. Fluorescence-detected XAS with sub-second time resolution reveals new details about the redox activity of Pt/CeO 2 catalyst. JOURNAL OF SYNCHROTRON RADIATION 2018; 25:989-997. [PMID: 29979160 PMCID: PMC6038606 DOI: 10.1107/s1600577518005325] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2018] [Accepted: 04/04/2018] [Indexed: 06/02/2023]
Abstract
A setup for fluorescence-detected X-ray absorption spectroscopy (XAS) with sub-second time resolution has been developed. This technique allows chemical speciation of low-concentrated materials embedded in highly absorbing matrices, which cannot be studied using transmission XAS. Using this setup, the reactivity of 1.5 wt% Pt/CeO2 catalyst was studied with 100 ms resolution during periodic cycling in CO- and oxygen-containing atmospheres in a plug-flow reactor. Measurements were performed at the Pt L3- and Ce L3-edges. The reactivity of platinum and cerium demonstrated a strong correlation. The oxidation of the catalyst starts on the ceria support helping the oxidation of platinum nanoparticles. The new time-resolved XAS setup can be applied to various systems, capable of reproducible cycling between different states triggered by gas atmosphere, light, temperature, etc. It opens up new perspectives for mechanistic studies on automotive catalysts, selective oxidation catalysts and photocatalysts.
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Affiliation(s)
- Alexander A. Guda
- The Smart Materials Research Center, Southern Federal University, Sladkova 174/28, Rostov-on-Don 344090, Russian Federation
| | - Aram L. Bugaev
- The Smart Materials Research Center, Southern Federal University, Sladkova 174/28, Rostov-on-Don 344090, Russian Federation
- Department of Chemistry, NIS and CrisDi Interdepartmental Centres, asn INST Reference Center, University of Turin, Via P. Giuria 7, Turin 10125, Italy
| | | | - Luca Braglia
- The Smart Materials Research Center, Southern Federal University, Sladkova 174/28, Rostov-on-Don 344090, Russian Federation
- Department of Chemistry, NIS and CrisDi Interdepartmental Centres, asn INST Reference Center, University of Turin, Via P. Giuria 7, Turin 10125, Italy
| | - Alexander V. Soldatov
- The Smart Materials Research Center, Southern Federal University, Sladkova 174/28, Rostov-on-Don 344090, Russian Federation
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30
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Gänzler AM, Casapu M, Maurer F, Störmer H, Gerthsen D, Ferré G, Vernoux P, Bornmann B, Frahm R, Murzin V, Nachtegaal M, Votsmeier M, Grunwaldt JD. Tuning the Pt/CeO2 Interface by in Situ Variation of the Pt Particle Size. ACS Catal 2018. [DOI: 10.1021/acscatal.8b00330] [Citation(s) in RCA: 115] [Impact Index Per Article: 19.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Andreas M. Gänzler
- Institute for Chemical Technology and Polymer Chemistry (ITCP), Karlsruhe Institute of Technology (KIT), Engesserstraße 20, 76131 Karlsruhe, Germany
| | - Maria Casapu
- Institute for Chemical Technology and Polymer Chemistry (ITCP), Karlsruhe Institute of Technology (KIT), Engesserstraße 20, 76131 Karlsruhe, Germany
| | - Florian Maurer
- Institute for Chemical Technology and Polymer Chemistry (ITCP), Karlsruhe Institute of Technology (KIT), Engesserstraße 20, 76131 Karlsruhe, Germany
| | - Heike Störmer
- Laboratory for Electron Microscopy, Karlsruhe Institute of Technology (KIT), Engesserstraße 7, 76131 Karlsruhe, Germany
| | - Dagmar Gerthsen
- Laboratory for Electron Microscopy, Karlsruhe Institute of Technology (KIT), Engesserstraße 7, 76131 Karlsruhe, Germany
| | - Géraldine Ferré
- Université de Lyon, Institut de Recherches sur la Catalyse et l’Environnement de Lyon (IRCELYON), UMR 5256, CNRS, Université Claude Bernard Lyon 1, 2 avenue A. Einstein, 69626 Villeurbanne, France
| | - Philippe Vernoux
- Université de Lyon, Institut de Recherches sur la Catalyse et l’Environnement de Lyon (IRCELYON), UMR 5256, CNRS, Université Claude Bernard Lyon 1, 2 avenue A. Einstein, 69626 Villeurbanne, France
| | - Benjamin Bornmann
- Department of Physics, University of Wuppertal, Gaußstraße 20, 42119 Wuppertal, Germany
| | - Ronald Frahm
- Department of Physics, University of Wuppertal, Gaußstraße 20, 42119 Wuppertal, Germany
| | - Vadim Murzin
- Deutsches Elektronen-Synchrotron (DESY), Notkestraße 85, 22607 Hamburg, Germany
| | - Maarten Nachtegaal
- Paul Scherrer Institute (PSI), PSI Aarebrücke, 5232 Villigen, Switzerland
| | - Martin Votsmeier
- Umicore AG & Co. KG, Rodenbacher Chaussee 4, 63457 Hanau, Germany
| | - Jan-Dierk Grunwaldt
- Institute for Chemical Technology and Polymer Chemistry (ITCP), Karlsruhe Institute of Technology (KIT), Engesserstraße 20, 76131 Karlsruhe, Germany
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31
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Müller SA, Degler D, Feldmann C, Türk M, Moos R, Fink K, Studt F, Gerthsen D, Bârsan N, Grunwaldt JD. Exploiting Synergies in Catalysis and Gas Sensing using Noble Metal-Loaded Oxide Composites. ChemCatChem 2018. [DOI: 10.1002/cctc.201701545] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Sabrina A. Müller
- Institute for Chemical Technology and Polymer Chemistry (ITCP); Karlsruhe Institute of Technology (KIT); 76131 Karlsruhe Germany
| | - David Degler
- Institute of Physical and Theoretical Chemistry; University of Tübingen (EKUT); 72076 Tübingen Germany
| | - Claus Feldmann
- Institute of Inorganic Chemistry (AOC); Karlsruhe Institute of Technology (KIT); 76131 Karlsruhe Germany
| | - Michael Türk
- Institute for Technical Thermodynamics and Refrigeration (ITTK); Karlsruhe Institute of Technology (KIT); 76131 Karlsruhe Germany
| | - Ralf Moos
- Department of Functional Materials; University of Bayreuth; 95447 Bayreuth Germany
| | - Karin Fink
- Institute of Nanotechnology (INT); Karlsruhe Institute of Technology (KIT); 76344 Eggenstein-Leopoldshafen Germany
| | - Felix Studt
- Institute for Chemical Technology and Polymer Chemistry (ITCP); Karlsruhe Institute of Technology (KIT); 76131 Karlsruhe Germany
- Institute of Catalysis Research and Technology (IKFT); Karlsruhe Institute of Technology (KIT); 76344 Eggenstein-Leopoldshafen Germany
| | - Dagmar Gerthsen
- Laboratory for Electron Microscopy (LEM); Karlsruhe Institute of Technology (KIT); 76131 Karlsruhe Germany
| | - Nicolae Bârsan
- Institute of Physical and Theoretical Chemistry; University of Tübingen (EKUT); 72076 Tübingen Germany
| | - Jan-Dierk Grunwaldt
- Institute for Chemical Technology and Polymer Chemistry (ITCP); Karlsruhe Institute of Technology (KIT); 76131 Karlsruhe Germany
- Institute of Catalysis Research and Technology (IKFT); Karlsruhe Institute of Technology (KIT); 76344 Eggenstein-Leopoldshafen Germany
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32
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Marchionni V, Szlachetko J, Nachtegaal M, Kambolis A, Kröcher O, Ferri D. An operando emission spectroscopy study of Pt/Al 2O 3 and Pt/CeO 2/Al 2O 3. Phys Chem Chem Phys 2018; 18:29268-29277. [PMID: 27731446 DOI: 10.1039/c6cp05992a] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
In situ time-resolved spectroscopic examination of catalysts based on well dispersed nanoparticles on metal oxides under transient conditions significantly facilitates the elucidation of reaction mechanisms. In this contribution, we demonstrate the level of structural information that can be obtained using high-energy resolution off-resonant spectroscopy (HEROS) to study 1.3 wt% Pt/Al2O3 and 1.3 wt% Pt/20 wt% CeO2/Al2O3 catalysts subjected to redox pulsing. First, HEROS is compared with XANES in a temperature programmed reduction experiment to demonstrate the increased sensitivity and time resolution of HEROS. Second, modulation excitation spectroscopy is exploited by redox pulsing to enhance the sensitivity of HEROS to structural changes by the application of phase sensitive detection (PSD) to the time-resolved HEROS data set. The HEROS measurements were complemented by resonant X-ray emission (RXES) and diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy measurements performed under identical conditions and in a single reactor cell in order to probe different aspects of the catalyst materials under the selected experimental conditions.
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Affiliation(s)
- Valentina Marchionni
- Paul Scherrer Institut
- Switzerland
- ETH Zurich
- Institute for Chemical and Bioengineering
- CH-8093 Zurich
| | - Jakub Szlachetko
- Paul Scherrer Institut
- Switzerland
- Jan Kochanowski University
- Institute of Physics
- PL-25-406 Kielce
| | | | | | - Oliver Kröcher
- Paul Scherrer Institut
- Switzerland
- École polytechnique fédérale de Lausanne (EPFL)
- Institute of Chemical Science and Engineering
- CH-1015 Lausanne
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33
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Bhargava A, Chen CY, Finkelstein KD, Ward MJ, Robinson RD. X-ray emission spectroscopy: an effective route to extract site occupation of cations. Phys Chem Chem Phys 2018; 20:28990-29000. [DOI: 10.1039/c8cp04628j] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Cation site occupation is an important determinant of materials properties, especially in a complex system with multiple cations such as in ternary spinels. In this work, we show that XES provides not only the site occupation information as EXAFS, but also additional information on the oxidation states of the cations at each site. Additionally, we show that XES is a superior and a far more accurate method than EXAFS.
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Affiliation(s)
- Anuj Bhargava
- Department of Materials Science and Engineering
- Cornell University
- Ithaca
- USA
| | - Cindy Y. Chen
- Department of Materials Science and Engineering
- Cornell University
- Ithaca
- USA
| | | | - Matthew J. Ward
- Cornell High Energy Synchrotron Source (CHESS)
- Cornell University
- Ithaca
- USA
- CLS@APS
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34
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Hoffman AS, Sokaras D, Zhang S, Debefve LM, Fang C, Gallo A, Kroll T, Dixon DA, Bare SR, Gates BC. High‐Energy‐Resolution X‐ray Absorption Spectroscopy for Identification of Reactive Surface Species on Supported Single‐Site Iridium Catalysts. Chemistry 2017; 23:14760-14768. [DOI: 10.1002/chem.201701459] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2017] [Indexed: 11/09/2022]
Affiliation(s)
- Adam S. Hoffman
- Department of Chemical Engineering University of California, Davis Davis CA 95616 USA
- Present address: Stanford Synchrotron Radiation Lightsource SLAC National Accelerator Laboratory Menlo Park CA 94025 USA
| | - Dimosthenis Sokaras
- Stanford Synchrotron Radiation Lightsource SLAC National Accelerator Laboratory Menlo Park CA 94025 USA
| | - Shengjie Zhang
- Department of Chemistry The University of Alabama Tuscaloosa AL 35487 USA
| | - Louise M. Debefve
- Department of Chemical Engineering University of California, Davis Davis CA 95616 USA
| | - Chia‐Yu Fang
- Department of Chemical Engineering University of California, Davis Davis CA 95616 USA
- Department of Materials Science and Engineering University of California, Davis Davis CA 95616 USA
| | - Alessandro Gallo
- Department of Chemical Engineering Stanford University Stanford CA 94305 USA
- SUNCAT Center for Interface Science and Catalysis SLAC National Accelerator Laboratory Menlo Park CA 94025 USA
| | - Thomas Kroll
- Stanford Synchrotron Radiation Lightsource SLAC National Accelerator Laboratory Menlo Park CA 94025 USA
| | - David A. Dixon
- Department of Chemistry The University of Alabama Tuscaloosa AL 35487 USA
| | - Simon R. Bare
- Stanford Synchrotron Radiation Lightsource SLAC National Accelerator Laboratory Menlo Park CA 94025 USA
| | - Bruce C. Gates
- Department of Chemical Engineering University of California, Davis Davis CA 95616 USA
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35
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Wetting Induced Oxidation of Pt-based Nano Catalysts Revealed by In Situ High Energy Resolution X-ray Absorption Spectroscopy. Sci Rep 2017; 7:1482. [PMID: 28469163 PMCID: PMC5431092 DOI: 10.1038/s41598-017-00639-1] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2016] [Accepted: 03/08/2017] [Indexed: 12/02/2022] Open
Abstract
In situ high energy resolution fluorescence detection X-ray absorption spectroscopy (HERFD-XAS) was used to systematically evaluate interactions of H2O and O2 adsorbed on Pt and Pt3Co nanoparticle catalysts in different particle sizes. The systematic increase in oxidation due to adsorption of different species (H2O adsorption <O2 adsorption <O2 + H2O coadsorption) suggests that cooperative behavior between O2 and H2O adsorptions is responsible for the overpotential induced by hydrated species in fuel cells. From the alloying and particle size effects, it is found that both strength of O2/H2O adsorption and their cooperative effect upon coadsorption are responsible for the specific activity of Pt catalysts.
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36
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Time Resolved Operando X-ray Techniques in Catalysis, a Case Study: CO Oxidation by O2 over Pt Surfaces and Alumina Supported Pt Catalysts. Catalysts 2017. [DOI: 10.3390/catal7020058] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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37
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Kravtsova AN, Pankin IA, Soldatov MA, Butova VV, Bobrova IA, Soldatov AV. Analysis of the local atomic structure of quantum dots of the CdS family. J STRUCT CHEM+ 2017. [DOI: 10.1134/s0022476616070179] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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38
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Shi G, Yano H, Tryk DA, Matsumoto M, Tanida H, Arao M, Imai H, Inukai J, Iiyama A, Uchida H. Weakened CO adsorption and enhanced structural integrity of a stabilized Pt skin/PtCo hydrogen oxidation catalyst analysed by in situ X-ray absorption spectroscopy. Catal Sci Technol 2017. [DOI: 10.1039/c7cy01700f] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In situ X-ray absorption spectroscopy has afforded a detailed structural and electronic characterization of a newly developed stabilized Pt-skin/PtCo alloy nanoparticle catalyst for CO-tolerant H2 oxidation.
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Affiliation(s)
- Guoyu Shi
- Interdisciplinary Graduate School of Medicine
- Engineering, and Agricultural Sciences
- University of Yamanashi
- Kofu
- Japan
| | - Hiroshi Yano
- Fuel Cell Nanomaterials Center
- University of Yamanashi
- Kofu
- Japan
| | - Donald A. Tryk
- Fuel Cell Nanomaterials Center
- University of Yamanashi
- Kofu
- Japan
| | | | - Hajime Tanida
- Device-Functional Analysis Department
- NISSAN ARC Ltd
- Yokosuka
- Japan
| | - Masazumi Arao
- Device-Functional Analysis Department
- NISSAN ARC Ltd
- Yokosuka
- Japan
| | - Hideto Imai
- Device-Functional Analysis Department
- NISSAN ARC Ltd
- Yokosuka
- Japan
| | - Junji Inukai
- Fuel Cell Nanomaterials Center
- University of Yamanashi
- Kofu
- Japan
- Clean Energy Research Center
| | - Akihiro Iiyama
- Fuel Cell Nanomaterials Center
- University of Yamanashi
- Kofu
- Japan
| | - Hiroyuki Uchida
- Fuel Cell Nanomaterials Center
- University of Yamanashi
- Kofu
- Japan
- Clean Energy Research Center
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39
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From Spectator Species to Active Site Using X-ray Absorption and Emission Spectroscopy Under Realistic Conditions. SPRINGER SERIES IN CHEMICAL PHYSICS 2017. [DOI: 10.1007/978-3-319-44439-0_4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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40
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Spanjers CS, Guillo P, Tilley TD, Janik MJ, Rioux RM. Identification of Second Shell Coordination in Transition Metal Species Using Theoretical XANES: Example of Ti–O–(C, Si, Ge) Complexes. J Phys Chem A 2016; 121:162-167. [DOI: 10.1021/acs.jpca.6b12197] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | - Pascal Guillo
- Department
of Chemistry, University of California, Berkeley, Berkeley, California 94720, United States
| | - T. Don Tilley
- Department
of Chemistry, University of California, Berkeley, Berkeley, California 94720, United States
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41
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Detecting and utilizing minority phases in heterogeneous catalysis. Sci Rep 2016; 6:37597. [PMID: 27883033 PMCID: PMC5121607 DOI: 10.1038/srep37597] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2016] [Accepted: 10/27/2016] [Indexed: 11/08/2022] Open
Abstract
Highly active phases in carbon monoxide oxidation are known, however they are transient in nature. Here, we determined for the first time the structure of such a highly active phase on platinum nanoparticles in an actual reactor. Unlike generally assumed, the surface of this phase is virtually free of adsorbates and co-exists with carbon-monoxide covered and surface oxidized platinum. Understanding the relation between gas composition and catalyst structure at all times and locations within a reactor enabled the rational design of a reactor concept, which maximizes the amount of the highly active phase and minimizes the amount of platinum needed.
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42
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Lima FA, Saleta ME, Pagliuca RJS, Eleotério MA, Reis RD, Fonseca Júnior J, Meyer B, Bittar EM, Souza-Neto NM, Granado E. XDS: a flexible beamline for X-ray diffraction and spectroscopy at the Brazilian synchrotron. JOURNAL OF SYNCHROTRON RADIATION 2016; 23:1538-1549. [PMID: 27787261 DOI: 10.1107/s160057751601403x] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2016] [Accepted: 09/02/2016] [Indexed: 06/06/2023]
Abstract
The majority of the beamlines at the Brazilian Synchrotron Light Source Laboratory (LNLS) use radiation produced in the storage-ring bending magnets and are therefore currently limited in the flux that can be used in the harder part of the X-ray spectrum (above ∼10 keV). A 4 T superconducting multipolar wiggler (SCW) was recently installed at LNLS in order to improve the photon flux above 10 keV and fulfill the demands set by the materials science community. A new multi-purpose beamline was then installed at the LNLS using the SCW as a photon source. The XDS is a flexible beamline operating in the energy range between 5 and 30 keV, designed to perform experiments using absorption, diffraction and scattering techniques. Most of the work performed at the XDS beamline concentrates on X-ray absorption spectroscopy at energies above 18 keV and high-resolution diffraction experiments. More recently, new setups and photon-hungry experiments such as total X-ray scattering, X-ray diffraction under high pressures, resonant X-ray emission spectroscopy, among others, have started to become routine at XDS. Here, the XDS beamline characteristics, performance and a few new experimental possibilities are described.
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Affiliation(s)
- F A Lima
- Laboratório Nacional de Luz Síncrotron, Caixa Postal 6192, CEP 13084-971, Campinas (SP), Brazil
| | - M E Saleta
- Laboratório Nacional de Luz Síncrotron, Caixa Postal 6192, CEP 13084-971, Campinas (SP), Brazil
| | - R J S Pagliuca
- Laboratório Nacional de Luz Síncrotron, Caixa Postal 6192, CEP 13084-971, Campinas (SP), Brazil
| | - M A Eleotério
- Laboratório Nacional de Luz Síncrotron, Caixa Postal 6192, CEP 13084-971, Campinas (SP), Brazil
| | - R D Reis
- Laboratório Nacional de Luz Síncrotron, Caixa Postal 6192, CEP 13084-971, Campinas (SP), Brazil
| | - J Fonseca Júnior
- Laboratório Nacional de Luz Síncrotron, Caixa Postal 6192, CEP 13084-971, Campinas (SP), Brazil
| | - B Meyer
- Laboratório Nacional de Luz Síncrotron, Caixa Postal 6192, CEP 13084-971, Campinas (SP), Brazil
| | - E M Bittar
- Centro Brasileiro de Pesquisas Físicas, Rua Doutor Xavier Sigaud 150, CEP 22290-180, Rio de Janeiro (RJ), Brazil
| | - N M Souza-Neto
- Laboratório Nacional de Luz Síncrotron, Caixa Postal 6192, CEP 13084-971, Campinas (SP), Brazil
| | - E Granado
- Instituto de Física `Gleb Wataghin', Universidade de Campinas, CEP 13083-859, Campinas (SP), Brazil
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43
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Fischer M, Hormes J, Marzun G, Wagener P, Hagemann U, Barcikowski S. In Situ Investigations of Laser-Generated Ligand-Free Platinum Nanoparticles by X-ray Absorption Spectroscopy: How Does the Immediate Environment Influence the Particle Surface? LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:8793-8802. [PMID: 27489980 DOI: 10.1021/acs.langmuir.6b00685] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Pulsed laser ablation in liquid (PLAL) has proven its usefulness as a nanoparticle (NP) synthesis method alternative to traditional chemical reduction methods, where the absence of any molecular ligands or residual reactants makes laser-generated nanoparticles ideal reference materials for charge-transfer experiments. We synthesized additive-free platinum nanoparticles by PLAL and in-situ characterized their interaction with H2O, sodium phosphate buffer, and sodium citrate as well as a TiO2 support by X-ray absorption fine structure (XAFS), i.e., X-ray absorption near-edge structure (XANES) and extended X-ray absorption fine structure (EXAFS). Differences in the white-line intensity among the colloidal particles in the three liquids indicate that the respective NP-solvent interaction varies in strength. The ions added ex situ diffuse through the particles' electric double layer and interact electrostatically with the Stern plane. Consequently, these ions weaken the interaction of the functional OH groups that are bound to the partially oxidized platinum surfaces and cause their partial reduction. Comparing XAFS spectra of laser-generated Pt NPs in citrate with wet-chemically synthesized ones (both ligand-covered) indicates different types of Pt-O bonds: a Pt(IV)O2 type in the case of wet-chemical NPs and a Pt(II)O type in the case of laser-generated NPs. A comparison of unsupported laser-generated platinum NPs in H2O with TiO2-supported ones shows no white-line intensity differences and also an identical number of Pt-O bonds in both cases. This suggests that in the deposition process at least part of the double-layer coating stays intact and that the ligand-free Pt particle properties are preserved in the TiO2-supported Pt particles, relevant for heterogeneous catalysis.
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Affiliation(s)
- Mathias Fischer
- Physikalisches Institut der Universitaet Bonn , Nußallee 12, 53115 Bonn, Germany
- Canadian Light Source, 44 Innovation Boulevard, Saskatoon, SK S7N 2 V3, Canada
| | - Josef Hormes
- Physikalisches Institut der Universitaet Bonn , Nußallee 12, 53115 Bonn, Germany
- Center for Advanced Microstructures and Devices, Louisiana State University , 6980 Jefferson Highway, Baton Rouge, Louisiana 70806, United States
| | - Galina Marzun
- Technical Chemistry I and Center for Nanointegration Duisburg-Essen (CENIDE) and NanoEnergieTechnikZentrum (NETZ), University of Duisburg-Essen , Universitaetsstr. 7, 45141 Essen, Germany
| | - Philipp Wagener
- Technical Chemistry I and Center for Nanointegration Duisburg-Essen (CENIDE) and NanoEnergieTechnikZentrum (NETZ), University of Duisburg-Essen , Universitaetsstr. 7, 45141 Essen, Germany
| | - Ulrich Hagemann
- Interdisciplinary Center for Analytics on the Nanoscale (ICAN) and Center for Nanointegration Duisburg-Essen (CENIDE) and NanoEnergieTechnikZentrum (NETZ), University of Duisburg-Essen , Carl-Benz-Str. 199, 47057 Duisburg, Germany
| | - Stephan Barcikowski
- Technical Chemistry I and Center for Nanointegration Duisburg-Essen (CENIDE) and NanoEnergieTechnikZentrum (NETZ), University of Duisburg-Essen , Universitaetsstr. 7, 45141 Essen, Germany
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44
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Kale MJ, Christopher P. Utilizing Quantitative in Situ FTIR Spectroscopy To Identify Well-Coordinated Pt Atoms as the Active Site for CO Oxidation on Al2O3-Supported Pt Catalysts. ACS Catal 2016. [DOI: 10.1021/acscatal.6b01128] [Citation(s) in RCA: 181] [Impact Index Per Article: 22.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Matthew J. Kale
- Department of Chemical & Environmental Engineering, ‡Program in Materials Science and Engineering, and §UCR Center for Catalysis, University of California, Riverside, California 92521, United States
| | - Phillip Christopher
- Department of Chemical & Environmental Engineering, ‡Program in Materials Science and Engineering, and §UCR Center for Catalysis, University of California, Riverside, California 92521, United States
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45
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Brieger C, Melke J, van der Bosch N, Reinholz U, Riesemeier H, Guilherme Buzanich A, Kayarkatte MK, Derr I, Schökel A, Roth C. A combined in-situ XAS–DRIFTS study unraveling adsorbate induced changes on the Pt nanoparticle structure. J Catal 2016. [DOI: 10.1016/j.jcat.2016.03.034] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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46
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Gänzler AM, Casapu M, Boubnov A, Müller O, Conrad S, Lichtenberg H, Frahm R, Grunwaldt JD. Operando spatially and time-resolved X-ray absorption spectroscopy and infrared thermography during oscillatory CO oxidation. J Catal 2015. [DOI: 10.1016/j.jcat.2015.01.002] [Citation(s) in RCA: 75] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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47
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Sherborne GJ, Nguyen BN. Recent XAS studies into Homogeneous metal catalyst in fine chemical and pharmaceutical syntheses. Chem Cent J 2015; 9:37. [PMID: 26140050 PMCID: PMC4488116 DOI: 10.1186/s13065-015-0103-6] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2014] [Accepted: 05/08/2015] [Indexed: 11/10/2022] Open
Abstract
A brief review of studies using X-ray Absorption Spectroscopy (XAS) to investigate homogeneous catalytic reactions in fine chemical and pharmaceutical context since 2010 is presented. The advantages of the techniques over traditional lab-based analytical tools, particularly when NMR spectroscopy fails to deliver mechanistic insights, are summarised using these examples. A discussion on the current limitations of the techniques and challenges in the near future is also included. Graphical abstractA minireview of recent developments in application of X-ray Absorption Spectroscopy as an effective mechanistic tool to synthetic catalytic reactions relevant to fine chemical and pharmaceutical syntheses.
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Affiliation(s)
- Grant J Sherborne
- Institute of Process Research & Development, School of Chemistry, University of Leeds, Woodhouse Lane, Leeds, LS2 9JT UK
| | - Bao N Nguyen
- Institute of Process Research & Development, School of Chemistry, University of Leeds, Woodhouse Lane, Leeds, LS2 9JT UK
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48
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Maurizio C, Cesca T, Perotto G, Kalinic B, Michieli N, Scian C, Joly Y, Battaglin G, Mazzoldi P, Mattei G. Core-shell-like Au sub-nanometer clusters in Er-implanted silica. NANOSCALE 2015; 7:8968-8977. [PMID: 25921415 DOI: 10.1039/c5nr01564b] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The very early steps of Au metal cluster formation in Er-doped silica have been investigated by high-energy resolution fluorescence-detected X-ray absorption spectroscopy (HERFD-XAS). A combined analysis of the near-edge and extended part of the experimental spectra shows that Au cluster nucleation starts from a few Au and O atoms covalently interconnected, likely in the presence of embryonic Au-Au correlation. The first Au clusters, characterized by a well defined Au-Au coordination distance, form upon 400 °C inert annealing. The estimated upper limit of the Gibbs free energy for the associated heterogeneous nucleation is 0.06 eV per atom, suggesting that the Au nucleation is assisted by matrix defects, most likely non-bridging oxygen atoms. The experimental results indicate that the formed subnanometer Au clusters can be applied as effective core-shell systems in which the Au atoms of the 'core' develop a metallic character, whereas the Au atoms in the 'shell' can retain a partially covalent bond with O atoms of the silica matrix. High structural disorder at the Au site is found upon neutral annealing at a moderate temperature (600 °C), likely driven by the configurational disorder of the defective silica matrix. A suitable choice of the Au concentration and annealing temperature allows tailoring of the Au cluster size in the sub-nanometer range. The interaction of the Au cluster surface with the surrounding silica matrix is likely responsible for the infrared luminescence previously reported on the same systems.
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Affiliation(s)
- Chiara Maurizio
- Physics and Astronomy Department and CNISM, University of Padova, via Marzolo 8, I-35131 Padova, Italy.
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49
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Alonso-Mori R, Sokaras D, Zhu D, Kroll T, Chollet M, Feng Y, Glownia JM, Kern J, Lemke HT, Nordlund D, Robert A, Sikorski M, Song S, Weng TC, Bergmann U. Photon-in photon-out hard X-ray spectroscopy at the Linac Coherent Light Source. JOURNAL OF SYNCHROTRON RADIATION 2015; 22:612-20. [PMID: 25931076 PMCID: PMC4416677 DOI: 10.1107/s1600577515004488] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/10/2014] [Accepted: 03/03/2015] [Indexed: 05/28/2023]
Abstract
X-ray free-electron lasers (FELs) have opened unprecedented possibilities to study the structure and dynamics of matter at an atomic level and ultra-fast timescale. Many of the techniques routinely used at storage ring facilities are being adapted for experiments conducted at FELs. In order to take full advantage of these new sources several challenges have to be overcome. They are related to the very different source characteristics and its resulting impact on sample delivery, X-ray optics, X-ray detection and data acquisition. Here it is described how photon-in photon-out hard X-ray spectroscopy techniques can be applied to study the electronic structure and its dynamics of transition metal systems with ultra-bright and ultra-short FEL X-ray pulses. In particular, some of the experimental details that are different compared with synchrotron-based setups are discussed and illustrated by recent measurements performed at the Linac Coherent Light Source.
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Affiliation(s)
- Roberto Alonso-Mori
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA
| | - Dimosthenis Sokaras
- Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA
| | - Diling Zhu
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA
| | - Thomas Kroll
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA
| | - Mathieu Chollet
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA
| | - Yiping Feng
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA
| | - James M. Glownia
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA
| | - Jan Kern
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA
- Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - Henrik T. Lemke
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA
| | - Dennis Nordlund
- Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA
| | - Aymeric Robert
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA
| | - Marcin Sikorski
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA
| | - Sanghoon Song
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA
| | - Tsu-Chien Weng
- Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA
| | - Uwe Bergmann
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA
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50
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Tromp M. Catalysis seen in action. PHILOSOPHICAL TRANSACTIONS. SERIES A, MATHEMATICAL, PHYSICAL, AND ENGINEERING SCIENCES 2015; 373:rsta.2013.0152. [PMID: 25624518 DOI: 10.1098/rsta.2013.0152] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Synchrotron radiation techniques are widely applied in materials research and heterogeneous catalysis. In homogeneous catalysis, its use so far is rather limited despite its high potential. Here, insights in the strengths and limitations of X-ray spectroscopy technique in the field of homogeneous catalysis are given, including new technique developments. A relevant homogeneous catalyst, used in the industrially important selective oligomerization of ethene, is taken as a worked-out example. Emphasis is placed on time-resolved operando X-ray absorption spectroscopy with outlooks to novel high energy resolution and emission techniques. All experiments described have been or can be done at the Diamond Light Source Ltd (Didcot, UK).
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Affiliation(s)
- Moniek Tromp
- Characterisation in Catalysis, Department of Chemistry, Catalysis Research Center, Technische Universität München, Lichtenbergstrasse 4, 85748 Garching bei München, Germany
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