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Zhang G, Pei J, Wang Y, Wang G, Wang Y, Liu W, Xu J, An P, Huang H, Zheng L, Chu S, Dong J, Zhang J. Selective Activation of Lattice Oxygen Site Through Coordination Engineering to Boost the Activity and Stability of Oxygen Evolution Reaction. Angew Chem Int Ed Engl 2024; 63:e202407509. [PMID: 38877769 DOI: 10.1002/anie.202407509] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2024] [Revised: 06/09/2024] [Accepted: 06/13/2024] [Indexed: 06/16/2024]
Abstract
Although Ru-based materials are among the outstanding catalysts for the oxygen evolution reaction (OER), the instability issue still haunts them and impedes the widespread application. The instability of Ru-based OER catalysts is generally ascribed to the formation of soluble species through the over-oxidation of Ru and structural decomposition caused by involvement of lattice oxygen. Herein, an effective strategy of selectively activating the lattice oxygen around Ru site is proposed to improve the OER activity and stability. Our synthesized spinel-type electrocatalyst of Ru and Zn co-doped Co3O4 showed an ultralow overpotential of 172 mV at 10 mA cm-2 and a long-term stability reaching to 100 hours at 10 mA cm-2 for alkaline OER. The experimental results and theoretical simulations demonstrated that the lattice oxygen site jointly connected with the octahedral Ru and tetrahedral Zn atoms became more active than other oxygen sites near Ru atom, which further lowered the reaction energy barriers and avoided generating excessive oxygen vacancies to enhance the structural stability of Ru sites. The findings hope to provide a new perspective to improve the catalytic activity of Ru-incorporated OER catalysts and the stability of lattice-oxygen-mediated mechanism.
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Affiliation(s)
- Guikai Zhang
- Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, China
- School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Jiajing Pei
- Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, China
| | - Yueshuai Wang
- Beijing Key Lab of Microstructure and Property of Advanced Materials, College of Materials Science and Engineering, Beijing University of Technology, Beijing, 100124, China
| | - Guowei Wang
- Beijing Key Lab of Microstructure and Property of Advanced Materials, College of Materials Science and Engineering, Beijing University of Technology, Beijing, 100124, China
| | - Yongsheng Wang
- State Key Lab of Organic-Inorganic Composites and Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing, 100029, China
| | - Wenchao Liu
- Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, China
- School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Jinfeng Xu
- Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, China
- School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Pengfei An
- Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, China
| | - Huan Huang
- Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, China
| | - Lirong Zheng
- Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, China
| | - Shengqi Chu
- Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, China
| | - Juncai Dong
- Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, China
| | - Jing Zhang
- Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, China
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2
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Shiu WT, Yoo V, Liu Y, Chang LY, Azizivahed T, Huang Y, Ragogna PJ, Liu L. Small but bright: origin of the enhanced luminescence of ultrasmall ZnGa 2O 4:Cr 3+ in mesoporous silica nanoparticles. Phys Chem Chem Phys 2024; 26:17561-17568. [PMID: 38869486 DOI: 10.1039/d4cp01775g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/14/2024]
Abstract
Chromium(III)-doped zinc gallate (CZGO) is one of the representative persistent luminescent phosphors emitting in the near-infrared (NIR) region. The emission wavelength it covers falls in the tissue-transparent window, making CZGO a promising optical probe for various biomedical applications. The PersL mechanism dictates that such a phenomenon is only profound in large crystals, so the preparation of CZGO with sizes small enough for biological applications while maintaining its luminescence remains a challenging task. Recent attempts to use mesoporous silica nanoparticles (MSN) as a template for growing nanosized CZGO have been successful. MSN is also a well-studied drug carrier, and incorporating CZGO in MSN further expands its potential in imaging-guided therapeutics. Despite the interest, it is unclear of how the addition of MSN would affect the luminescence properties of CZGO. In this work, we observed that forming a CZGO@MSN nanocomposite could enhance the luminescence intensity and extend the PersL lifetime of CZGO. X-ray absorption fine structure (XAFS) analysis was conducted to investigate the local structure of Zn2+, and an interaction between Zn2+ in CZGO and the MSN matrix was identified.
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Affiliation(s)
- Wai-Tung Shiu
- Department of Chemistry, The University of Western Ontario, 1151 Richmond Street, London, Ontario N6A 5B7, Canada.
| | - Vania Yoo
- Department of Chemistry, The University of Western Ontario, 1151 Richmond Street, London, Ontario N6A 5B7, Canada.
| | - Yihong Liu
- Department of Chemistry, The University of Western Ontario, 1151 Richmond Street, London, Ontario N6A 5B7, Canada.
| | - Lo-Yueh Chang
- National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu, 30076, Taiwan
| | - Tahereh Azizivahed
- Department of Chemistry, The University of Western Ontario, 1151 Richmond Street, London, Ontario N6A 5B7, Canada.
| | - Yining Huang
- Department of Chemistry, The University of Western Ontario, 1151 Richmond Street, London, Ontario N6A 5B7, Canada.
| | - Paul J Ragogna
- Department of Chemistry, The University of Western Ontario, 1151 Richmond Street, London, Ontario N6A 5B7, Canada.
| | - Lijia Liu
- Department of Chemistry, The University of Western Ontario, 1151 Richmond Street, London, Ontario N6A 5B7, Canada.
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3
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Deans I, Stewart DI, Jones J, Kam J, Mishra B. Uptake and speciation of Zn and Pb by Miscanthus grown in contaminated soils. JOURNAL OF HAZARDOUS MATERIALS 2023; 445:129899. [PMID: 36493643 DOI: 10.1016/j.jhazmat.2022.129899] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2022] [Revised: 08/22/2022] [Accepted: 08/31/2022] [Indexed: 06/17/2023]
Abstract
The uptake by and distribution of Zn and Pb within a novel seed-based Miscanthus hybrid grown in contaminated soil was assessed. Results from juvenile plants in a pot-trial was compared with data for mature biomass of the same species harvested during a field-trial. Both Zn and Pb uptake by juvenile plants were observed to increase in proportion to the soil concentrations. Both Zn and Pb accumulation differed between leaf and stem structures, and both were different in the mature biomass compared with juvenile plants. Analysis of X-Ray Absorption Fine Structures (XAFS) revealed different Zn speciation in stems and leaves, and differences in Zn speciation with plant maturity. Sulfur ligands consistent with the presence of cysteine rich metallothioneins (MT) and phytochelatin (PC) complexes were the dominant Zn species in juvenile plant leaves, together with octahedral O/N species typified by Zn-malate. Sulfur ligands were also prevalent in stems from juvenile plants, but predominant O/N speciation shifted towards tetrahedral coordination. In contrast, tetrahedral Zn coordination with O/N species predominated in the mature biomass crop. The XAFS spectra for the mature biomass were consistent with Zn being retained within cell walls as pectin and/or phosphate complexes.
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Affiliation(s)
- Innes Deans
- School of Chemical and Process Engineering, University of Leeds, Leeds, United Kingdom
| | - Douglas I Stewart
- School of Civil Engineering, University of Leeds, Leeds, United Kingdom
| | - Jenny Jones
- School of Chemical and Process Engineering, University of Leeds, Leeds, United Kingdom
| | - Jason Kam
- Terravesta Ltd, Lincoln, United Kingdom
| | - Bhoopesh Mishra
- School of Chemical and Process Engineering, University of Leeds, Leeds, United Kingdom; Physics Department, Illinois Institute of Technology, Chicago, United States.
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4
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Lahiri D, Agrawal R, Chandravanshi K, Rajput P, Agrawal A, Dwivedi A, Makde RD, Jha SN, Garg N. Assessing the prospect of XAFS experiments of metalloproteins under in vivo conditions at Indus-2 synchrotron facility, India. JOURNAL OF SYNCHROTRON RADIATION 2023; 30:449-456. [PMID: 36891859 PMCID: PMC10000809 DOI: 10.1107/s1600577522011791] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/01/2022] [Accepted: 12/10/2022] [Indexed: 06/18/2023]
Abstract
The feasibility of X-ray absorption fine-structure (XAFS) experiments of ultra-dilute metalloproteins under in vivo conditions (T = 300 K, pH = 7) at the BL-9 bending-magnet beamline (Indus-2) is reported, using as an example analogous synthetic Zn (0.1 mM) M1dr solution. The (Zn K-edge) XAFS of M1dr solution was measured with a four-element silicon drift detector. The first-shell fit was tested and found to be robust against statistical noise, generating reliable nearest-neighbor bond results. The results are found to be invariant between physiological and non-physiological conditions, which confirms the robust coordination chemistry of Zn with important biological implications. The scope of improving spectral quality for accommodation of higher-shell analysis is addressed.
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Affiliation(s)
- Debdutta Lahiri
- High Pressure and Synchrotron Radiation Physics, Bhabha Atomic Research Centre, Mumbai 400085, India
| | - Richa Agrawal
- Department of Biochemistry and Molecular Biology, University of Chicago, 929 E 57th Street, Chicago, IL 60637, USA
| | | | - Parasmani Rajput
- Beamline Development and Application Section, Bhabha Atomic Research Centre, Mumbai 400085, India
| | - Ankur Agrawal
- Beamline Development and Application Section, Bhabha Atomic Research Centre, Mumbai 400085, India
| | - Ashutosh Dwivedi
- Beamline Development and Application Section, Bhabha Atomic Research Centre, Mumbai 400085, India
| | - Ravindra D. Makde
- Beamline Development and Application Section, Bhabha Atomic Research Centre, Mumbai 400085, India
| | - S. N. Jha
- Beamline Development and Application Section, Bhabha Atomic Research Centre, Mumbai 400085, India
| | - Nandini Garg
- High Pressure and Synchrotron Radiation Physics, Bhabha Atomic Research Centre, Mumbai 400085, India
- Homi Bhabha National Institute, Training School Complex, Anushaktinagar, Mumbai 400094, India
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5
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Anné J, Canoville A, Edwards NP, Schweitzer MH, Zanno LE. Independent Evidence for the Preservation of Endogenous Bone Biochemistry in a Specimen of Tyrannosaurus rex. BIOLOGY 2023; 12:biology12020264. [PMID: 36829540 PMCID: PMC9953530 DOI: 10.3390/biology12020264] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/29/2022] [Revised: 02/03/2023] [Accepted: 02/04/2023] [Indexed: 02/11/2023]
Abstract
Biomolecules preserved in deep time have potential to shed light on major evolutionary questions, driving the search for new and more rigorous methods to detect them. Despite the increasing body of evidence from a wide variety of new, high resolution/high sensitivity analytical techniques, this research is commonly met with skepticism, as the long standing dogma persists that such preservation in very deep time (>1 Ma) is unlikely. The Late Cretaceous dinosaur Tyrannosaurus rex (MOR 1125) has been shown, through multiple biochemical studies, to preserve original bone chemistry. Here, we provide additional, independent support that deep time bimolecular preservation is possible. We use synchrotron X-ray fluorescence imaging (XRF) and X-ray absorption spectroscopy (XAS) to investigate a section from the femur of this dinosaur, and demonstrate preservation of elements (S, Ca, and Zn) associated with bone remodeling and redeposition. We then compare these data to the bone of an extant dinosaur (bird), as well as a second non-avian dinosaur, Tenontosaurus tilletti (OMNH 34784) that did not preserve any sign of original biochemistry. Our data indicate that MOR 1125 bone cortices have similar bone elemental distributions to that of an extant bird, which supports preservation of original endogenous chemistry in this specimen.
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Affiliation(s)
- Jennifer Anné
- The Children’s Museum of Indianapolis, Indianapolis, IN 46208, USA
- Correspondence:
| | | | - Nicholas P. Edwards
- Stanford Synchrotron Radiation Light Source, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
| | - Mary H. Schweitzer
- Department of Biological Sciences, Campus Box 7617, North Carolina State University, Raleigh, NC 27695, USA
- Paleontology, North Carolina Museum of Natural Sciences, 11 W. Jones St., Raleigh, NC 27601, USA
- Department of Geology, Lund University, Sölvegatan 12, 223 62 Lund, Sweden
| | - Lindsay E. Zanno
- Department of Biological Sciences, Campus Box 7617, North Carolina State University, Raleigh, NC 27695, USA
- Paleontology, North Carolina Museum of Natural Sciences, 11 W. Jones St., Raleigh, NC 27601, USA
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6
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Eckelt F, Rothweiler P, Braun F, Voss L, Šarić A, Vrankić M, Lützenkirchen-Hecht D. In Situ Observation of ZnO Nanoparticle Formation by a Combination of Time-Resolved X-ray Absorption Spectroscopy and X-ray Diffraction. MATERIALS (BASEL, SWITZERLAND) 2022; 15:8186. [PMID: 36431670 PMCID: PMC9699227 DOI: 10.3390/ma15228186] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/20/2022] [Revised: 11/07/2022] [Accepted: 11/15/2022] [Indexed: 06/16/2023]
Abstract
The formation of ZnO nanomaterials from different Zn acetylacetonate precursor solutions was studied in situ by employing simultaneous, time-resolved X-ray diffraction (XRD) and X-ray absorption spectroscopy (EXAFS) at the Zn K-edge. The precursor solutions were heated from room temperature to the desired reaction temperatures in a hermetically sealed cell dedicated to X-ray experiments. In general, the first indications for the formation of hexagonal ZnO were found for elevated temperatures of about 80 °C both by XRD and EXAFS, and the contributions increase with temperature and time. However, no reaction intermediates could be proved in addition to the Zn precursors and the formed hexagonal ZnO materials. Furthermore, the results show that the efficiency of the reaction, i.e., the conversion of the precursor material to the ZnO product, strongly depends on the solvent used and the reaction temperature. ZnO formation is accelerated by an increased temperature of 165 °C and the use of 1-octanol, with a conversion to ZnO of more than 80% after only a ca. 35 min reaction time according to a detailed analysis of the EXAFS data. For comparison, an identical concentration of Zn acetylacetonate in water or dilute alkaline NaOH solutions and a reaction temperature of around 90 °C leads to a smaller conversion of approximately 50% only, even after several hours of reaction. The particle size determined from XRD for different orientations shows a preferred orientation along the c-direction of the hexagonal crystal system, as well in accordance with scanning electron microscopy. The LaMer model explained this highly non-uniform growth of needle-like ZnO crystallites.
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Affiliation(s)
- Franz Eckelt
- Faculty of Natural Sciences, University of Wuppertal, Gauss-Str. 20, 42119 Wuppertal, Germany
| | - Patrick Rothweiler
- Faculty of Natural Sciences, University of Wuppertal, Gauss-Str. 20, 42119 Wuppertal, Germany
| | - Frederic Braun
- Faculty of Natural Sciences, University of Wuppertal, Gauss-Str. 20, 42119 Wuppertal, Germany
| | - Lukas Voss
- Faculty of Natural Sciences, University of Wuppertal, Gauss-Str. 20, 42119 Wuppertal, Germany
| | - Ankica Šarić
- Centre of Excellence for Advanced Materials and Sensing Devices, Division of Materials Physics, Ruđer Bošković Institute, HR-10002 Zagreb, Croatia
| | - Martina Vrankić
- Centre of Excellence for Advanced Materials and Sensing Devices, Division of Materials Physics, Ruđer Bošković Institute, HR-10002 Zagreb, Croatia
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7
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Effect of thermal annealing on the film and substrate/film interface: the case of ZnFe2O4. APPLIED NANOSCIENCE 2022. [DOI: 10.1007/s13204-021-02129-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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8
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Paul N, Sarkar R, Sarkar S. Iron and Zinc Porphyrin Linked MoO(dithiolene) Complexes in Relevance to Electron Transfer between Mo-cofactor and Cytochrome b5 in Sulfite Oxidase. Dalton Trans 2022; 51:12447-12452. [DOI: 10.1039/d2dt01863b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Oxo-molybdenum (dithiolene) complex covalently linked individually to iron and zinc porphyrin have been synthesized to show an electron transfer between the two metal centres in relevance to electron transfer from...
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9
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Görlin M, Ojwang DO, Lee MT, Renman V, Tai CW, Valvo M. Aging and Charge Compensation Effects of the Rechargeable Aqueous Zinc/Copper Hexacyanoferrate Battery Elucidated Using In Situ X-ray Techniques. ACS APPLIED MATERIALS & INTERFACES 2021; 13:59962-59974. [PMID: 34878765 PMCID: PMC8704201 DOI: 10.1021/acsami.1c19167] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
The zinc/copper hexacyanoferrate (Zn/CuHCF) cell has gained attention as an aqueous rechargeable zinc-ion battery (ZIB) owing to its open framework, excellent rate capability, and high safety. However, both the Zn anode and the CuHCF cathode show unavoidable signs of aging during cycling, though the underlying mechanisms have remained somewhat ambiguous. Here, we present an in-depth study of the CuHCF cathode by employing various X-ray spectroscopic techniques. This allows us to distinguish between structure-related aging effects and charge compensation processes associated with electroactive metal centers upon Zn2+ ion insertion/deinsertion. By combining high-angle annular dark-field-scanning electron transmission microscopy, X-ray absorption spectroscopy (XAS), X-ray photoelectron spectroscopy, and elemental analysis, we reconstruct the picture of both the bulk and the surface. First, we identify a set of previously debated X-ray diffraction peaks appearing at early stages of cycling (below 200 cycles) in CuHCF. Our data suggest that these peaks are unrelated to hypothetical ZnxCu1-xHCF phases or to oxidic phases, but are caused by partial intercalation of ZnSO4 into graphitic carbon. We further conclude that Cu is the unstable species during aging, whose dissolution is significant at the surface of the CuHCF particles. This triggers Zn2+ ions to enter newly formed Cu vacancies, in addition to native Fe vacancies already present in the bulk, which causes a reduction of nearby metal sites. This is distinct from the charge compensation process where both the Cu2+/Cu+ and Fe3+/Fe2+ redox couples participate throughout the bulk. By tracking the K-edge fluorescence using operando XAS coupled with cyclic voltammetry, we successfully link the aging effect to the activation of the Fe3+/Fe2+ redox couple as a consequence of Cu dissolution. This explains the progressive increase in the voltage of the charge/discharge plateaus upon repeated cycling. We also find that SO42- anions reversibly insert into CuHCF during charge. Our work clarifies several intriguing structural and redox-mediated aging mechanisms in the CuHCF cathode and pinpoints parameters that correlate with the performance, which will hold importance for the development of future Prussian blue analogue-type cathodes for aqueous rechargeable ZIBs.
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Affiliation(s)
- Mikaela Görlin
- Department
of Chemistry-Ångström Laboratory, Uppsala University, P.O. Box 538, SE-75121 Uppsala, Sweden
| | - Dickson O. Ojwang
- Department
of Chemistry-Ångström Laboratory, Uppsala University, P.O. Box 538, SE-75121 Uppsala, Sweden
| | - Ming-Tao Lee
- Department
of Chemistry-Ångström Laboratory, Uppsala University, P.O. Box 538, SE-75121 Uppsala, Sweden
| | - Viktor Renman
- Department
of Materials Science and Engineering, Norwegian
University of Science and Technology, NO-7491 Trondheim, Norway
| | - Cheuk-Wai Tai
- Department
of Materials and Environmental Chemistry, Stockholm University, SE-106
91 Stockholm, Sweden
| | - Mario Valvo
- Department
of Chemistry-Ångström Laboratory, Uppsala University, P.O. Box 538, SE-75121 Uppsala, Sweden
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10
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Nozik D, Tinga FMP, Bell AT. Propane Dehydrogenation and Cracking over Zn/H-MFI Prepared by Solid-State Ion Exchange of ZnCl 2. ACS Catal 2021. [DOI: 10.1021/acscatal.1c03641] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Danna Nozik
- Department of Chemical and Biomolecular Engineering, University of California, Berkeley, California 94720, United States
| | - Francesca Mikaela P. Tinga
- Department of Chemical and Biomolecular Engineering, University of California, Berkeley, California 94720, United States
| | - Alexis T. Bell
- Department of Chemical and Biomolecular Engineering, University of California, Berkeley, California 94720, United States
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11
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Nelson J. XANES reflects coordination change and underlying surface disorder of zinc adsorbed to silica. JOURNAL OF SYNCHROTRON RADIATION 2021; 28:1119-1126. [PMID: 34212875 DOI: 10.1107/s1600577521004033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/20/2021] [Accepted: 04/15/2021] [Indexed: 06/13/2023]
Abstract
Zinc K-edge X-ray absorption near-edge structure (XANES) spectroscopy of Zn adsorbed to silica and Zn-bearing minerals, salts and solutions was conducted to explore how XANES spectra reflect coordination environment and disorder in the surface to which a metal ion is sorbed. Specifically, XANES spectra for five distinct Zn adsorption complexes (Znads) on quartz and amorphous silica [SiO2(am)] are presented from the Zn-water-silica surface system: outer-sphere octahedral Znads on quartz, inner-sphere octahedral Znads on quartz, inner-sphere tetrahedral Znads on quartz, inner-sphere octahedral Znads on SiO2(am) and inner-sphere tetrahedral Znads on SiO2(am). XANES spectral analysis of these complexes on quartz versus SiO2(am) reveals that normalized peak absorbance and K-edge energy position generally decrease with increasing surface disorder and decreasing Zn-O coordination. On quartz, the absorption-edge energy of Znads ranges from 9663.0 to 9664.1 eV for samples dominated by tetrahedrally versus octahedrally coordinated species, respectively. On SiO2(am), the absorption-edge energy of Znads ranges from 9662.3 to 9663.4 eV for samples dominated by tetrahedrally versus octahedrally coordinated species, respectively. On both silica substrates, octahedral Znads presents a single K-edge peak feature, whereas tetrahedral Znads presents two absorbance features. The energy space between the two absorbance peak features of the XANES K-edge of tetrahedral Znads is 2.4 eV for Zn on quartz and 3.2 eV for Zn on SiO2(am). Linear combination fitting of samples with a mixture of Znads complex types demonstrates that the XANES spectra of octahedral and tetrahedral Znads on silica are distinct enough for quantitative identification. These results suggest caution when deciphering Zn speciation in natural samples via linear combination approaches using a single Znads standard to represent sorption on a particular mineral surface. Correlation between XANES spectral features and prior extended X-ray absorption fine structure (EXAFS) derived coordination environments for these Znads on silica samples provides insight into Zn speciation in natural systems with XANES compatible Zn concentrations too low for EXAFS analysis.
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Affiliation(s)
- Joey Nelson
- School of Earth, Energy and Environmental Sciences, Stanford University, 450 Serra Mall, Stanford, CA 94305-2115, USA
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12
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Saloga PEJ, Smales GJ, Clark AH, Thünemann AF. Zinc Phosphate Nanoparticles Produced in Saliva. Eur J Inorg Chem 2020. [DOI: 10.1002/ejic.202000521] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Affiliation(s)
- Patrick E. J. Saloga
- Bundesanstalt für Materialforschung und ‐prüfung (BAM) Unter den Eichen 87 12205 Berlin Germany
- Freie Universität Berlin, Fachbereich Biologie, Chemie, Pharmazie Takustraße 3 14195 Berlin Germany
| | - Glen J. Smales
- Bundesanstalt für Materialforschung und ‐prüfung (BAM) Unter den Eichen 87 12205 Berlin Germany
| | - Adam H. Clark
- Paul Scherrer Institut Forschungsstrasse 111 5232 Villigen PSI Switzerland
| | - Andreas F. Thünemann
- Bundesanstalt für Materialforschung und ‐prüfung (BAM) Unter den Eichen 87 12205 Berlin Germany
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