1
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Chen LX, Yano J. Deciphering Photoinduced Catalytic Reaction Mechanisms in Natural and Artificial Photosynthetic Systems on Multiple Temporal and Spatial Scales Using X-ray Probes. Chem Rev 2024; 124:5421-5469. [PMID: 38663009 DOI: 10.1021/acs.chemrev.3c00560] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/09/2024]
Abstract
Utilization of renewable energies for catalytically generating value-added chemicals is highly desirable in this era of rising energy demands and climate change impacts. Artificial photosynthetic systems or photocatalysts utilize light to convert abundant CO2, H2O, and O2 to fuels, such as carbohydrates and hydrogen, thus converting light energy to storable chemical resources. The emergence of intense X-ray pulses from synchrotrons, ultrafast X-ray pulses from X-ray free electron lasers, and table-top laser-driven sources over the past decades opens new frontiers in deciphering photoinduced catalytic reaction mechanisms on the multiple temporal and spatial scales. Operando X-ray spectroscopic methods offer a new set of electronic transitions in probing the oxidation states, coordinating geometry, and spin states of the metal catalytic center and photosensitizers with unprecedented energy and time resolution. Operando X-ray scattering methods enable previously elusive reaction steps to be characterized on different length scales and time scales. The methodological progress and their application examples collected in this review will offer a glimpse into the accomplishments and current state in deciphering reaction mechanisms for both natural and synthetic systems. Looking forward, there are still many challenges and opportunities at the frontier of catalytic research that will require further advancement of the characterization techniques.
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Affiliation(s)
- Lin X Chen
- Chemical Science and Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
| | - Junko Yano
- Molecular Biophysics & Integrated Bioimaging Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
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2
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Anker AS, Friis-Jensen U, Johansen FL, Billinge SJL, Jensen KMØ. ClusterFinder: a fast tool to find cluster structures from pair distribution function data. Acta Crystallogr A Found Adv 2024; 80:213-220. [PMID: 38420993 PMCID: PMC10913672 DOI: 10.1107/s2053273324001116] [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: 11/22/2023] [Accepted: 02/01/2024] [Indexed: 03/02/2024] Open
Abstract
A novel automated high-throughput screening approach, ClusterFinder, is reported for finding candidate structures for atomic pair distribution function (PDF) structural refinements. Finding starting models for PDF refinements is notoriously difficult when the PDF originates from nanoclusters or small nanoparticles. The reported ClusterFinder algorithm can screen 104 to 105 candidate structures from structural databases such as the Inorganic Crystal Structure Database (ICSD) in minutes, using the crystal structures as templates in which it looks for atomic clusters that result in a PDF similar to the target measured PDF. The algorithm returns a rank-ordered list of clusters for further assessment by the user. The algorithm has performed well for simulated and measured PDFs of metal-oxido clusters such as Keggin clusters. This is therefore a powerful approach to finding structural cluster candidates in a modelling campaign for PDFs of nanoparticles and nanoclusters.
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Affiliation(s)
- Andy S. Anker
- Department of Chemistry and Nano-Science Center, University of Copenhagen, 2100 Copenhagen Ø, Denmark
| | - Ulrik Friis-Jensen
- Department of Chemistry and Nano-Science Center, University of Copenhagen, 2100 Copenhagen Ø, Denmark
- Department of Computer Science, University of Copenhagen, 2100 Copenhagen Ø, Denmark
| | - Frederik L. Johansen
- Department of Chemistry and Nano-Science Center, University of Copenhagen, 2100 Copenhagen Ø, Denmark
- Department of Computer Science, University of Copenhagen, 2100 Copenhagen Ø, Denmark
| | - Simon J. L Billinge
- Department of Applied Physics and Applied Mathematics Science, Columbia University, New York, NY 10027, USA
| | - Kirsten M. Ø. Jensen
- Department of Chemistry and Nano-Science Center, University of Copenhagen, 2100 Copenhagen Ø, Denmark
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3
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Liang J, Zu H, Si H, Ma Y, Li M. Synthesis of ethane-disulfonate pillared layered cobalt hydroxide towards the electrocatalytic oxygen evolution reaction. Dalton Trans 2023; 52:2115-2123. [PMID: 36722796 DOI: 10.1039/d2dt03358e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
We report the synthesis of a hybrid layered cobalt hydroxide sample and its redox behaviors in the electrochemical oxygen evolution reaction (OER). Compound Co7(OH)12(C2H4S2O6)·1.6H2O was synthesized via a homogeneous alkalization reaction using Co(SO3C2H4SO3) and hexamethylenetetramine. This compound comprises cationic host layers of {[Co7(OH)12]2+}∞, which comprise octahedrally (CoOh) and tetrahedrally (CoTd) coordinated Co cations at a CoOh : CoTd ratio of 5 : 2. The ethane-disulfonate ions are combined with the cationic host layers by electrostatic attractions and hydrogen bonding as a hybrid pillared layered framework. This hybrid sample can promote the OER in 1 M KOH with an overpotential as low as ∼410 mV (at a current density of 10 mA cm-2). In situ Raman spectroscopy showed that the sample first evolved into Co(III)-based phases comprising a mixture of layered CoOOH and spinel Co3O4, and the Co(III)-based compounds were converted into Co(IV)-O intermediates containing [CoO6] units at the onsite of the OER. The structural evolution behaviors suggest that the catalyst prefers a topotactic phase transition and the CoOh and CoTd units exhibit different activities in the electrochemical reaction. The electron transfer events involved in the electrochemical reaction were identified by Fourier-transformed alternating current voltammetry.
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Affiliation(s)
- Jianbo Liang
- Department of Chemistry, Capital Normal University, Beijing, 100048, P. R. China.
| | - Hang Zu
- Department of Chemistry, Capital Normal University, Beijing, 100048, P. R. China.
| | - Huiling Si
- Department of Chemistry, Capital Normal University, Beijing, 100048, P. R. China.
| | - Yanhong Ma
- Department of Chemistry, Capital Normal University, Beijing, 100048, P. R. China.
| | - Mengyao Li
- Department of Chemistry, Capital Normal University, Beijing, 100048, P. R. China.
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4
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Sugiarto, Imai Y, Hayashi Y. Synthesis of Water-Soluble Planar Cobalt(II), Nickel(II), and Copper(II) Hydroxo Clusters Using a (1,4,7-Triazacyclononane)cobalt(III) Complex as a Hydrolysis-Terminating Group. Inorg Chem 2023; 62:1845-1854. [PMID: 35749230 DOI: 10.1021/acs.inorgchem.2c01046] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
We report on a group of planar cobalt(II), nickel(II), and copper(II) hydroxo clusters that have a definite composition and are water-soluble: [{Co(tacn)(OH)2}6Co7(OH)12](NO3)2(CF3SO3)6·10H2O (1), [{Co(tacn)(OH)2}6Ni7(OH)12](NO3)2(CF3SO3)6·10H2O (2a), [{Co(tacn)(OH)2}6Ni7(OH)12](BNPP)8·6CH3NO2·8H2O [2b; BNPP = bis(p-nitrophenyl)phosphate], [{Co(tacn)(OH)2}12Ni16(OH)26(OH2)2](SO4)4(CF3SO3)10·30H2O (3a), [{Co(tacn)(OH)2}12Ni16(OH)26(OH2)2](SO4)8(CF3SO3)2·44H2O (3b), [{Co(tacn)(OH)2}2Co2(OH)2(OH2)4](SO4)(CF3SO3)2·4H2O (4), [{Co(tacn)(OH)2}2Ni2(OH)2(OH2)4](SO4)(CF3SO3)2·4H2O (5), and [{Co(tacn)(OH)2}4Cu4(OH)6](ClO4)6·5H2O (6), where tacn is 1,4,7-triazacyclononane. The peripheral of each metal hydroxo cluster plane is chemically protected by the coordination of {CoIII(tacn)(OH)2}+ groups to prevent further hydrolysis. These clusters were synthesized by the reaction of an equimolar amount of [Co(tacn)(OH2)3]3+ and cobalt, nickel, or copper salt at pH values in the range of 6.0-12.0. The structure of the cation in compounds 1, 2a or 2b, 4, and 5 is relevant to the surface structure of the cobalt phosphate and nickel borate oxygen-evolution catalysts; in particular, the Co7(OH)12 core in 1. Moreover, the arrangement of M7(OH)12 in 1 and 2a or 2b and Cu4(OH)6 in 6 represents the solid-state structures of the (111) face of the cubic CoO or NiO and the (002) plane of Cu(OH)2, respectively. Extended X-ray absorption fine structure spectra of an aqueous solution of 1, 2a, 4, and 5 exhibit well-resolved peaks at the first and second coordination spheres due to the M-O and M···M distances, respectively; the solution-state bond distances were estimated, and they agreed well with the bond distances in the solid-state structures.
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Affiliation(s)
- Sugiarto
- Department of Chemistry, Kanazawa University, Kakuma, Kanazawa 920-1192, Japan
| | - Yuya Imai
- Department of Chemistry, Kanazawa University, Kakuma, Kanazawa 920-1192, Japan
| | - Yoshihito Hayashi
- Department of Chemistry, Kanazawa University, Kakuma, Kanazawa 920-1192, Japan
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5
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Mengele A, Rau S. Learning from Nature's Example: Repair Strategies in Light-Driven Catalysis. JACS AU 2023; 3:36-46. [PMID: 36711104 PMCID: PMC9875256 DOI: 10.1021/jacsau.2c00507] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/19/2022] [Revised: 11/04/2022] [Accepted: 11/10/2022] [Indexed: 06/18/2023]
Abstract
The continuous repair of subunits of the photosynthetic apparatus is a key factor determining the overall efficiency of biological photosynthesis. Recent concepts for repairing artificial photocatalysts and catalytically active materials within the realm of solar fuel formation show great potential in reshaping the research directions within this field. This perspective describes the latest advances, concepts, and mechanisms in the field of catalyst repair and catalyst self-healing and provides an outlook on which additional steps need to be taken to bring artificial photosynthetic systems closer to real-life applications.
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Affiliation(s)
- Alexander
K. Mengele
- Institute
of Inorganic Chemistry I, Ulm University, Albert-Einstein-Allee 11, 89081 Ulm, Germany
| | - Sven Rau
- Institute
of Inorganic Chemistry I, Ulm University, Albert-Einstein-Allee 11, 89081 Ulm, Germany
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6
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Hausmann JN, Mebs S, Dau H, Driess M, Menezes PW. Oxygen Evolution Activity of Amorphous Cobalt Oxyhydroxides: Interconnecting Precatalyst Reconstruction, Long-Range Order, Buffer-Binding, Morphology, Mass Transport, and Operation Temperature. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2022; 34:e2207494. [PMID: 36189873 DOI: 10.1002/adma.202207494] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/17/2022] [Revised: 09/15/2022] [Indexed: 06/16/2023]
Abstract
Nanocrystalline or amorphous cobalt oxyhydroxides (CoCat) are promising electrocatalysts for the oxygen evolution reaction (OER). While having the same short-range order, CoCat phases possess different electrocatalytic properties. This phenomenon is not conclusively understood, as multiple interdependent parameters affect the OER activity simultaneously. Herein, a layered cobalt borophosphate precatalyst, Co(H2 O)2 [B2 P2 O8 (OH)2 ]·H2 O, is fully reconstructed into two different CoCat phases. In contrast to previous reports, this reconstruction is not initiated at the surface but at the electrode substrate to catalyst interface. Ex situ and in situ investigations of the two borophosphate derived CoCats, as well as the prominent CoPi and CoBi identify differences in the Tafel slope/range, buffer binding and content, long-range order, number of accessible edge sites, redox activity, and morphology. Considering and interconnecting these aspects together with proton mass-transport limitations, a comprehensive picture is provided explaining the different OER activities. The most decisive factors are the buffers used for reconstruction, the number of edge sites that are not inhibited by irreversibly bonded buffers, and the morphology. With this acquired knowledge, an optimized OER system is realized operating in near-neutral potassium borate medium at 1.62 ± 0.03 VRHE yielding 250 mA cm-2 at 65 °C for 1 month without degrading performance.
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Affiliation(s)
- J Niklas Hausmann
- Department of Chemistry: Metalorganics and Inorganic Materials, Technical University of Berlin, Straße des 17 Juni 135, Sekr. C2, 10623, Berlin, Germany
| | - Stefan Mebs
- Department of Physics, Free University of Berlin, Arnimallee 14, 14195, Berlin, Germany
| | - Holger Dau
- Department of Physics, Free University of Berlin, Arnimallee 14, 14195, Berlin, Germany
| | - Matthias Driess
- Department of Chemistry: Metalorganics and Inorganic Materials, Technical University of Berlin, Straße des 17 Juni 135, Sekr. C2, 10623, Berlin, Germany
| | - Prashanth W Menezes
- Department of Chemistry: Metalorganics and Inorganic Materials, Technical University of Berlin, Straße des 17 Juni 135, Sekr. C2, 10623, Berlin, Germany
- Material Chemistry Group for Thin Film Catalysis-CatLab, Helmholtz-Center Berlin for Materials and Energy, Albert-Einstein-Str. 15, 12489, Berlin, Germany
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7
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Araki Y, Tsunekawa S, Sakai A, Harada K, Nagatsuka R, Suzuki‐Sakamaki M, Amemiya K, Wang K, Kawai T, Yoshida M. Development of a Hemispherical Cavity Cobalt Electrocatalyst for Water Oxidation Based on a Polystyrene Colloidal Template Electrodeposition Method. ChemistrySelect 2022. [DOI: 10.1002/slct.202200600] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Yusaku Araki
- Graduate School of Sciences and Technology for Innovation Yamaguchi University Tokiwadai Ube Yamaguchi 755-8611 Japan
| | - Shun Tsunekawa
- Graduate School of Sciences and Technology for Innovation Yamaguchi University Tokiwadai Ube Yamaguchi 755-8611 Japan
| | - Arisu Sakai
- Graduate School of Sciences and Technology for Innovation Yamaguchi University Tokiwadai Ube Yamaguchi 755-8611 Japan
| | - Kazuki Harada
- Graduate School of Sciences and Technology for Innovation Yamaguchi University Tokiwadai Ube Yamaguchi 755-8611 Japan
| | - Ryosuke Nagatsuka
- Department of Industrial Chemistry Tokyo University of Science Kagurazaka Shinjuku-ku Tokyo 162-8601 Japan
| | | | - Kenta Amemiya
- Institute of Materials Structure Science High Energy Accelerator Research Organization Oho Tsukuba Ibaraki 305-0801 Japan
| | - Ke‐Hsuan Wang
- Department of Industrial Chemistry Tokyo University of Science Kagurazaka Shinjuku-ku Tokyo 162-8601 Japan
| | - Takeshi Kawai
- Department of Industrial Chemistry Tokyo University of Science Kagurazaka Shinjuku-ku Tokyo 162-8601 Japan
| | - Masaaki Yoshida
- Graduate School of Sciences and Technology for Innovation Yamaguchi University Tokiwadai Ube Yamaguchi 755-8611 Japan
- Blue Energy Center for SGE Technology (BEST) Yamaguchi University
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8
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Jewell CF, Subramanian A, Nam CY, Finke RG. Understanding the "Anti-Catalyst" Effect with Added CoO x Water Oxidation Catalyst in Dye-Sensitized Photoelectrolysis Cells: Carbon Impurities in Nanostructured SnO 2 Are the Culprit. ACS APPLIED MATERIALS & INTERFACES 2022; 14:25326-25336. [PMID: 35611991 DOI: 10.1021/acsami.2c02692] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
In 2017, we reported a dye-sensitized, photoelectrolysis cell consisting of fluorine-doped tin oxide (FTO)-coated glass covered by SnO2 nanoparticles coated with N,N'-bis(phosphonomethyl)-3,4,9,10-perylenediimide (PMPDI) dye and then a photoelectrochemically deposited CoOx water oxidation catalyst (WOCatalyst), FTO/nano-SnO2/PMPDI/CoOx. This system employed nanostructured SnO2 stabilized by a polyethyleneglycol bisphenol A epichlorohydrin (PEG-BAE) copolymer and other C-containing additives based on a literature synthesis to achieve a higher surface area and thus greater PMPDI dye absorption and resultant light collection. Surprisingly, the addition of the well-established WOCatalyst CoOx resulted in a decrease in the photocurrent, an unexpected "anti-catalyst" effect. Two primary questions addressed in the present study are (1) what is the source of this "anti-catalyst" effect? and (2) are the findings of broader interest? Reflection on the synthesis of nano-SnO2 stabilized by PEG-BAE, and the large, ca. 10:1 ratio of C to Sn in synthesis, led to the hypothesis that even the annealing step at 450 °C in of the FTO/SnO2 anode precursors was unlikely to remove all the carbon initially present. Indeed, residual carbon impurities are shown to be the culprit in the presently observed "anti-catalyst" effect. The implication and anticipated broader impact of the results of answering the two abovementioned questions are also presented and discussed along with a section entitled "Perspective and Suggestions for the Field Going Forward."
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Affiliation(s)
- Carly F Jewell
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, United States
| | - Ashwanth Subramanian
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794, United States
| | - Chang-Yong Nam
- Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York, New York 11973, United States
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794, United States
| | - Richard G Finke
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, United States
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9
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Abstract
Electrochemical and photoelectrochemical water splitting offers a scalable approach to producing hydrogen from renewable sources for sustainable energy storage. Depending on the applications, oxygen evolution catalysts (OECs) may perform water splitting under a variety of conditions. However, low stability and/or activity present challenges to the design of OECs, prompting the design of self-healing OECs composed of earth-abundant first-row transition metal oxides. The concept of self-healing catalysis offers a new tool to be employed in the design of stable and functionally active OECs under operating conditions ranging from acidic to basic solutions and from a variety of water sources. Large scale sustainable energy storage by water splitting benefits from performing the oxygen evolution reaction under a variety of conditions. Here, the authors discuss self-healing catalysis as a new tool in the design of stable and functionally active catalysts in acidic to basic solutions, and a variety of water sources
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10
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Bimetallic Copper/Ruthenium/Osmium Complexes: Observation of Conformational Differences Between the Solution Phase and Solid State by Atomic Pair Distribution Function Analysis. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202111764] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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11
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Nocera DG. Proton-Coupled Electron Transfer: The Engine of Energy Conversion and Storage. J Am Chem Soc 2022; 144:1069-1081. [PMID: 35023740 DOI: 10.1021/jacs.1c10444] [Citation(s) in RCA: 52] [Impact Index Per Article: 26.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Proton-coupled electron transfer (PCET) underpins energy conversion in chemistry and biology. Four energy systems are described whose discoveries are based on PCET: the water splitting chemistry of the Artificial Leaf, the carbon fixation chemistry of the Bionic Leaf-C, the nitrogen fixation chemistry of the Bionic Leaf-N and the Coordination Chemistry Flow Battery (CCFB). Whereas the Artificial Leaf, Bionic Leaf-C, and Bionic Leaf-N require strong coupling between electron and proton to reduce energetic barriers to enable high energy efficiencies, the CCFB requires complete decoupling of the electron and proton so as to avoid parasitic energy-wasting reactions. The proper design of PCET in these systems facilitates their implementation in the areas of (i) centralized large scale grid storage of electricity and (ii) decentralized energy storage/conversion using only sunlight, air and any water source to produce fuel and food within a sustainable cycle for the biogenic elements of C, N and P.
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Affiliation(s)
- Daniel G Nocera
- Department of Chemistry and Chemical Biology, Harvard University, 12 Oxford Street, Cambridge, Massachusetts 02138, United States
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12
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Amtawong J, Nguyen AI, Tilley TD. Mechanistic Aspects of Cobalt–Oxo Cubane Clusters in Oxidation Chemistry. J Am Chem Soc 2022; 144:1475-1492. [DOI: 10.1021/jacs.1c11445] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Jaruwan Amtawong
- Department of Chemistry, University of California, Berkeley, Berkeley, California 94720, United States
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Andy I. Nguyen
- Department of Chemistry, University of Illinois, Chicago, Chicago, Illinois 60607, United States
| | - T. Don Tilley
- Department of Chemistry, University of California, Berkeley, Berkeley, California 94720, United States
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
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13
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Platero-Prats AE, Mavrandonakis A, Liu J, Chen Z, Chen Z, Li Z, Yakovenko AA, Gallington LC, Hupp JT, Farha OK, Cramer CJ, Chapman KW. The Molecular Path Approaching the Active Site in Catalytic Metal-Organic Frameworks. J Am Chem Soc 2021; 143:20090-20094. [PMID: 34826220 DOI: 10.1021/jacs.1c11213] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
How molecules approach, bind at, and release from catalytic sites is key to heterogeneous catalysis, including for emerging metal-organic framework (MOF)-based catalysts. We use in situ synchrotron X-ray scattering analysis to evaluate the dominant binding sites for reagent and product molecules in the vicinity of catalytic Ni-oxo clusters in NU-1000 with different surface functionalization under conditions approaching those used in catalysis. The locations of the reagent and product molecules within the pores can be linked to the activity for ethylene hydrogenation. For the most active catalyst, ethylene reagent molecules bind close to the catalytic clusters, but only at temperatures approaching experimentally observed onset of catalysis. The ethane product molecules favor a different binding location suggesting that the product is readily released from the active site. An unusual guest-dependence of the framework negative thermal expansion is documented. We hypothesize that reagent and product binding sites reflect the pathway through the MOF to the active site and can be used to identify key factors that impact the catalytic activity.
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Affiliation(s)
- Ana E Platero-Prats
- X-ray Science Division, Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, United States
| | - Andreas Mavrandonakis
- Department of Chemistry, Chemical Theory Center, and Supercomputing Institute, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Jian Liu
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
| | - Zhihengyu Chen
- Department of Chemistry, Stony Brook University, Stony Brook, New York 11790, United States
| | - Zhijie Chen
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
| | - Zhanyong Li
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
| | - Andrey A Yakovenko
- X-ray Science Division, Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, United States
| | - Leighanne C Gallington
- X-ray Science Division, Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, United States
| | - Joseph T Hupp
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
| | - Omar K Farha
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States.,Department of Chemical and Biological Engineering, Northwestern University, Evanston, Illinois 60208, United States
| | - Christopher J Cramer
- Department of Chemistry, Chemical Theory Center, and Supercomputing Institute, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Karena W Chapman
- X-ray Science Division, Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, United States.,Department of Chemistry, Stony Brook University, Stony Brook, New York 11790, United States
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14
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Xie ZL, Liu X, Valentine AJS, Lynch VM, Tiede DM, Li X, Mulfort KL. Bimetallic Copper/Ruthenium/Osmium Complexes: Observation of Conformational Differences Between the Solution Phase and Solid State by Atomic Pair Distribution Function Analysis. Angew Chem Int Ed Engl 2021; 61:e202111764. [PMID: 34788495 DOI: 10.1002/anie.202111764] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2021] [Revised: 10/26/2021] [Indexed: 11/10/2022]
Abstract
High-energy X-ray scattering and pair distribution function analysis (HEXS/PDF) is a powerful method to reveal the structure of materials lacking long-range order, but is underutilized for molecular complexes in solution. We demonstrate the application of HEXS/PDF with 0.26 Å resolution to uncover the solution structure of five bimetallic CuI /RuII /OsII complexes. HEXS/PDF of each complex in acetonitrile solution confirms the pairwise distances in the local coordination sphere of each metal center as well as the metal⋅⋅⋅metal distances separated by over 12 Å. The metal⋅⋅⋅metal distance detected in solution is compared with that from the crystal structure and molecular models to confirm that distortions to the metal bridging ligand are unique to the solid state. This work presents the first example of observing sub-Ångström conformational differences by direct comparison of solution phase and solid-state structures and shows the potential for HEXS/PDF in the determination of solution structure of single molecules.
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Affiliation(s)
- Zhu-Lin Xie
- Division of Chemical Sciences and Engineering, Argonne National Laboratory, 9700 S Cass Ave, Lemont, IL, 60439, USA
| | - Xiaolin Liu
- Department of Chemistry, University of Washington, 109 Bagley Hall, Seattle, WA, 98195-1700, USA
| | - Andrew J S Valentine
- Department of Chemistry, University of Washington, 109 Bagley Hall, Seattle, WA, 98195-1700, USA
| | - Vincent M Lynch
- Department of Chemistry, University of Texas at Austin, 105 E 24TH ST., Austin, TX, 78712-1224, USA
| | - David M Tiede
- Division of Chemical Sciences and Engineering, Argonne National Laboratory, 9700 S Cass Ave, Lemont, IL, 60439, USA
| | - Xiaosong Li
- Department of Chemistry, University of Washington, 109 Bagley Hall, Seattle, WA, 98195-1700, USA
| | - Karen L Mulfort
- Division of Chemical Sciences and Engineering, Argonne National Laboratory, 9700 S Cass Ave, Lemont, IL, 60439, USA
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15
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Lang C, Li J, Yang KR, Wang Y, He D, Thorne JE, Croslow S, Dong Q, Zhao Y, Prostko G, Brudvig GW, Batista VS, Waegele MM, Wang D. Observation of a potential-dependent switch of water-oxidation mechanism on Co-oxide-based catalysts. Chem 2021. [DOI: 10.1016/j.chempr.2021.03.015] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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16
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Kwon G, Chang SH, Heo JE, Lee KJ, Kim JK, Cho BG, Koo TY, Kim BJ, Kim C, Lee JH, Bak SM, Beyer KA, Zhong H, Koch RJ, Hwang S, Utschig LM, Huang X, Hu G, Brudvig GW, Tiede DM, Kim J. Experimental Verification of Ir 5d Orbital States and Atomic Structures in Highly Active Amorphous Iridium Oxide Catalysts. ACS Catal 2021. [DOI: 10.1021/acscatal.1c00818] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Gihan Kwon
- National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, New York 11973, United States
| | - Seo Hyoung Chang
- Department of Physics, Chung-Ang University, Seoul 06974, Republic of Korea
| | - Jin Eun Heo
- Department of Physics, Chung-Ang University, Seoul 06974, Republic of Korea
| | - Kyeong Jun Lee
- Department of Physics, Chung-Ang University, Seoul 06974, Republic of Korea
| | - Jin-Kwang Kim
- Department of Physics, Pohang University of Science and Technology, Pohang,Gyeongbuk 37673, Republic of Korea
- Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science (IBS), 77 Cheongam-Ro, Pohang, Gyeongbuk 37673, Republic of Korea
| | - Byeong-Gwan Cho
- Pohang Accelerator Laboratory, Pohang, Gyeongbuk 37673, Republic of Korea
| | - Tae Yeong Koo
- Pohang Accelerator Laboratory, Pohang, Gyeongbuk 37673, Republic of Korea
| | - B. J. Kim
- Department of Physics, Pohang University of Science and Technology, Pohang,Gyeongbuk 37673, Republic of Korea
- Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science (IBS), 77 Cheongam-Ro, Pohang, Gyeongbuk 37673, Republic of Korea
| | - Chanseok Kim
- School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulsan 44919, Republic of Korea
| | - Jun Hee Lee
- School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulsan 44919, Republic of Korea
| | - Seong-Min Bak
- National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, New York 11973, United States
| | - Kevin A. Beyer
- X-Ray Science Division, Advanced Photon Source, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Hui Zhong
- Joint Photon Sciences Institute, Stony Brook University, Stony Brook, New York 11794, United States
| | - Robert J. Koch
- Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, United States
| | - Sooyeon Hwang
- Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973, United States
| | - Lisa M. Utschig
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Xiaojing Huang
- National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, New York 11973, United States
| | - Gongfang Hu
- Department of Chemistry, Yale University, New Haven, Connecticut 06520, United States
| | - Gary W. Brudvig
- Department of Chemistry, Yale University, New Haven, Connecticut 06520, United States
| | - David M. Tiede
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Jungho Kim
- X-Ray Science Division, Advanced Photon Source, Argonne National Laboratory, Lemont, Illinois 60439, United States
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17
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Ezhov R, Ravari AK, Bury G, Smith PF, Pushkar Y. Do multinuclear 3d metal catalysts achieve O-O bond formation via radical coupling or via water nucleophilic attack? WNA leads the way in [Co 4O 4] n. CHEM CATALYSIS 2021; 1:407-422. [PMID: 37378353 PMCID: PMC10296785 DOI: 10.1016/j.checat.2021.03.013] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/29/2023]
Abstract
Catalytic water oxidation is a required process for clean energy production based on the concept of artificial photosynthesis. Here, we provide in situ spectroscopic and computational analysis for the closest known photosystem II analog, [Co4O4]n+ ([Co4O4Py4Ac4]0, Py = pyridine and Ac = CH3COO-), which catalyzes electrochemical water oxidation. In situ extended X-ray absorption fine structure detects an ultrashort, CoIV=O (~1.67 Å) moiety, a crucial intermediate for O-O bond formation. Density function theory analyses show that the intermediate has two CoIV centers and a CoIV=O unit of strong radicaloid character sufficient to support a CoIV=O + H2O = Co-OOH + H+ transition, where the carboxyl ligand accepts the proton and the bridging oxygen stabilizes the peroxide via hydrogen bonding. The proposed water nucleophilic attack mechanism accounts for all prior spectroscopic evidence on the Co4O44+ core. Our results are important for the design and development of efficient water oxidation catalysts, which contribute to the ultimate goal of clean energy from artificial photosynthesis.
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Affiliation(s)
- Roman Ezhov
- Department of Physics and Astronomy, Purdue University, West Lafayette, IN 47907, USA
| | | | - Gabriel Bury
- Department of Physics and Astronomy, Purdue University, West Lafayette, IN 47907, USA
| | - Paul F. Smith
- Department of Chemistry, Valparaiso University, Valparaiso, IN 46383, USA
| | - Yulia Pushkar
- Department of Physics and Astronomy, Purdue University, West Lafayette, IN 47907, USA
- Lead contact
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18
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Li N, Hadt RG, Hayes D, Chen LX, Nocera DG. Detection of high-valent iron species in alloyed oxidic cobaltates for catalysing the oxygen evolution reaction. Nat Commun 2021; 12:4218. [PMID: 34244515 PMCID: PMC8270959 DOI: 10.1038/s41467-021-24453-6] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2021] [Accepted: 06/15/2021] [Indexed: 01/08/2023] Open
Abstract
Iron alloying of oxidic cobaltate catalysts results in catalytic activity for oxygen evolution on par with Ni-Fe oxides in base but at much higher alloying compositions. Zero-field 57Fe Mössbauer spectroscopy and X-ray absorption spectroscopy (XAS) are able to clearly identify Fe4+ in mixed-metal Co-Fe oxides. The highest Fe4+ population is obtained in the 40–60% Fe alloying range, and XAS identifies the ion residing in an octahedral oxide ligand field. The oxygen evolution reaction (OER) activity, as reflected in Tafel analysis of CoFeOx films in 1 M KOH, tracks the absolute concentration of Fe4+. The results reported herein suggest an important role for the formation of the Fe4+ redox state in activating cobaltate OER catalysts at high iron loadings. The capturing of high valent iron in a catalytic reaction is important but difficult task. Here, the authors report identification of a high-valent Fe(IV)-species with different spectroscopic tools such as Mössbauer spectroscopy and X-ray absorption spectroscopy during the course of an oxygen evolving reaction.
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Affiliation(s)
- Nancy Li
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA, USA
| | - Ryan G Hadt
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, IL, USA. .,Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA, USA.
| | - Dugan Hayes
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, IL, USA. .,Department of Chemistry, University of Rhode Island, Kingston, RI, USA.
| | - Lin X Chen
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, IL, USA.,Department of Chemistry, Northwestern University, Evanston, IL, USA
| | - Daniel G Nocera
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA, USA.
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19
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Rajput A, Kundu A, Chakraborty B. Recent Progress on Copper‐Based Electrode Materials for Overall Water‐Splitting. ChemElectroChem 2021. [DOI: 10.1002/celc.202100307] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Anubha Rajput
- Department of Chemistry Indian Institute of Technology Delhi Hauz Khas 110016 New Delhi India
| | - Avinava Kundu
- Department of Chemistry Indian Institute of Technology Delhi Hauz Khas 110016 New Delhi India
| | - Biswarup Chakraborty
- Department of Chemistry Indian Institute of Technology Delhi Hauz Khas 110016 New Delhi India
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20
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Li J, Triana CA, Wan W, Adiyeri Saseendran DP, Zhao Y, Balaghi SE, Heidari S, Patzke GR. Molecular and heterogeneous water oxidation catalysts: recent progress and joint perspectives. Chem Soc Rev 2021; 50:2444-2485. [DOI: 10.1039/d0cs00978d] [Citation(s) in RCA: 51] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
The recent synthetic and mechanistic progress in molecular and heterogeneous water oxidation catalysts highlights the new, overarching strategies for knowledge transfer and unifying design concepts.
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Affiliation(s)
- J. Li
- Department of Chemistry
- University of Zurich
- CH-8057 Zurich
- Switzerland
| | - C. A. Triana
- Department of Chemistry
- University of Zurich
- CH-8057 Zurich
- Switzerland
| | - W. Wan
- Department of Chemistry
- University of Zurich
- CH-8057 Zurich
- Switzerland
| | | | - Y. Zhao
- Department of Chemistry
- University of Zurich
- CH-8057 Zurich
- Switzerland
| | - S. E. Balaghi
- Department of Chemistry
- University of Zurich
- CH-8057 Zurich
- Switzerland
| | - S. Heidari
- Department of Chemistry
- University of Zurich
- CH-8057 Zurich
- Switzerland
| | - G. R. Patzke
- Department of Chemistry
- University of Zurich
- CH-8057 Zurich
- Switzerland
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21
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He X, Waldman RZ, Mandia DJ, Jeon N, Zaluzec NJ, Borkiewicz OJ, Ruett U, Darling SB, Martinson ABF, Tiede DM. Resolving the Atomic Structure of Sequential Infiltration Synthesis Derived Inorganic Clusters. ACS NANO 2020; 14:14846-14860. [PMID: 33170644 DOI: 10.1021/acsnano.0c03848] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Sequential infiltration synthesis (SIS) is a route to the precision deposition of inorganic solids in analogy to atomic layer deposition but occurs within (vs upon) a soft material template. SIS has enabled exquisite nanoscale morphological complexity in various oxides through selective nucleation in block copolymers templates. However, the earliest stages of SIS growth remain unresolved, including the atomic structure of nuclei and the evolution of local coordination environments, before and after polymer template removal. We employed In K-edge extended X-ray absorption fine structure and atomic pair distribution function analysis of high-energy X-ray scattering to unravel (1) the structural evolution of InOxHy clusters inside a poly(methyl methacrylate) (PMMA) host matrix and (2) the formation of porous In2O3 solids (obtained after annealing) as a function of SIS cycle number. Early SIS cycles result in InOxHy cluster growth with high aspect ratio, followed by the formation of a three-dimensional network with additional SIS cycles. That the atomic structures of the InOxHy clusters can be modeled as multinuclear clusters with bonding patterns related to those in In2O3 and In(OH)3 crystal structures suggests that SIS may be an efficient route to 3D arrays of discrete-atom-number clusters. Annealing the mixed inorganic/polymer films in air removes the PMMA template and consolidates the as-grown clusters into cubic In2O3 nanocrystals with structural details that also depend on SIS cycle number.
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Affiliation(s)
| | - Ruben Z Waldman
- Pritzker School of Molecular Engineering, University of Chicago, Chicago, Illinois 60637, United States
| | | | | | | | | | | | - Seth B Darling
- Pritzker School of Molecular Engineering, University of Chicago, Chicago, Illinois 60637, United States
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22
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Tiede DM, Kwon G, He X, Mulfort KL, Martinson ABF. Characterizing electronic and atomic structures for amorphous and molecular metal oxide catalysts at functional interfaces by combining soft X-ray spectroscopy and high-energy X-ray scattering. NANOSCALE 2020; 12:13276-13296. [PMID: 32567636 DOI: 10.1039/d0nr02350g] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Amorphous thin film materials and heterogenized molecular catalysts supported on electrode and other functional interfaces are widely investigated as promising catalyst formats for applications in solar and electrochemical fuels catalysis. However the amorphous character of these catalysts and the complexity of the interfacial architectures that merge charge transport properties of electrode and semiconductor supports with discrete sites for multi-step catalysis poses challenges for probing mechanisms that activate and tune sites for catalysis. This minireview discusses advances in soft X-ray spectroscopy and high-energy X-ray scattering that provide opportunities to resolve interfacial electronic and atomic structures, respectively, that are linked to catalysis. This review discusses how these techniques can be partnered with advances in nanostructured interface synthesis for combined soft X-ray spectroscopy and high-energy X-ray scattering analyses of thin film and heterogenized molecular catalysts. These combined approaches enable opportunities for the characterization of both electronic and atomic structures underlying fundamental catalytic function, and that can be applied under conditions relevant to device applications.
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Affiliation(s)
- David M Tiede
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois, USA.
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23
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Costentin C. Proton-Coupled Electron Transfer Catalyst: Heterogeneous Catalysis. Application to an Oxygen Evolution Catalyst. ACS Catal 2020. [DOI: 10.1021/acscatal.0c02532] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Cyrille Costentin
- Département de Chimie Moléculaire, Université Grenoble-Alpes, CNRS, UMR 5250, 38000 Grenoble, France
- Université de Paris, 75013 Paris, France
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24
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Christiansen TL, Cooper SR, Jensen KMØ. There's no place like real-space: elucidating size-dependent atomic structure of nanomaterials using pair distribution function analysis. NANOSCALE ADVANCES 2020; 2:2234-2254. [PMID: 36133369 PMCID: PMC9418950 DOI: 10.1039/d0na00120a] [Citation(s) in RCA: 42] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/12/2020] [Accepted: 05/05/2020] [Indexed: 05/25/2023]
Abstract
The development of new functional materials builds on an understanding of the intricate relationship between material structure and properties, and structural characterization is a crucial part of materials chemistry. However, elucidating the atomic structure of nanomaterials remains a challenge using conventional diffraction techniques due to the lack of long-range atomic order. Over the past decade, Pair Distribution Function (PDF) analysis of X-ray or neutron total scattering data has become a mature and well-established method capable of giving insight into the atomic structure in nanomaterials. Here, we review the use of PDF analysis and modelling in characterization of a range of different nanomaterials that exhibit unique atomic structure compared to the corresponding bulk materials. A brief introduction to PDF analysis and modelling is given, followed by examples of how essential structural information can be extracted from PDFs using both model-free and advanced modelling methods. We put an emphasis on how the intuitive nature of the PDF can be used for understanding important structural motifs, and on the diversity of applications of PDF analysis to nanostructure problems.
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Affiliation(s)
| | - Susan R Cooper
- Department of Chemistry and Nanoscience Center, University of Copenhagen 2100 Copenhagen Ø Denmark
| | - Kirsten M Ø Jensen
- Department of Chemistry and Nanoscience Center, University of Copenhagen 2100 Copenhagen Ø Denmark
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25
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Pasquini C, D'Amario L, Zaharieva I, Dau H. Operando Raman spectroscopy tracks oxidation-state changes in an amorphous Co oxide material for electrocatalysis of the oxygen evolution reaction. J Chem Phys 2020; 152:194202. [PMID: 33687254 DOI: 10.1063/5.0006306] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Transition metal oxides are of high interest in both energy storage (batteries) and production of non-fossil fuels by (photo)electrocatalysis. Their functionally crucial charge (oxidation state) changes and electrocatalytic properties are best investigated under electrochemical operation conditions. We established operando Raman spectroscopy for investigation of the atomic structure and oxidation state of a non-crystalline, hydrated, and phosphate-containing Co oxide material (CoCat), which is an electrocatalyst for the oxygen evolution reaction (OER) at neutral pH and is structurally similar to LiCoO2 of batteries. Raman spectra were collected at various sub-catalytic and catalytic electric potentials. 2H labeling suggests Co oxidation coupled to Co-OH deprotonation at catalytic potentials. 18O labeling supports O-O bond formation starting from terminally coordinated oxygen species. Two broad bands around 877 cm-1 and 1077 cm-1 are assigned to CoCat-internal H2PO4 -. Raman peaks corresponding to terminal oxide (Co=O) or reactive oxygen species were not detectable; 1000-1200 cm-1 bands were instead assigned to two-phonon Raman scattering. At an increasingly positive potential, the intensity of the Raman bands decreased, which is unexpected and explained by self-absorption relating to CoCat electrochromism. A red-shift of the Co-O Raman bands with increasing potentials was described by four Gaussian bands of potential-dependent amplitudes. By linear combination of Raman band amplitudes, we can follow individually the Co(2+/3+) and Co(3+/4+) redox transitions, whereas previously published x-ray absorption spectroscopy analysis could determine only the averaged Co oxidation state. Our results show how electrochemical operando Raman spectroscopy can be employed as a potent analytical tool in mechanistic investigations on OER catalysis.
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Affiliation(s)
- Chiara Pasquini
- Department of Physics, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany
| | - Luca D'Amario
- Department of Physics, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany
| | - Ivelina Zaharieva
- Department of Physics, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany
| | - Holger Dau
- Department of Physics, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany
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26
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Li N, Keane TP, Veroneau SS, Nocera DG. Role of electrolyte composition on the acid stability of mixed-metal oxygen evolution catalysts. Chem Commun (Camb) 2020; 56:10477-10480. [DOI: 10.1039/d0cc03863f] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Acid stability in catalysts that promote the oxygen evolution reaction (OER) involves an interplay between electrolyte and catalyst composition, both of which must be judiciously selected in order to promote activity and durability.
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Affiliation(s)
- Nancy Li
- Department of Chemistry and Chemical Biology
- Harvard University
- Cambridge
- USA
| | - Thomas P. Keane
- Department of Chemistry and Chemical Biology
- Harvard University
- Cambridge
- USA
| | - Samuel S. Veroneau
- Department of Chemistry and Chemical Biology
- Harvard University
- Cambridge
- USA
| | - Daniel G. Nocera
- Department of Chemistry and Chemical Biology
- Harvard University
- Cambridge
- USA
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27
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Kwon G, Cho YH, Kim KB, Emery JD, Kim IS, Zhang X, Martinson ABF, Tiede DM. Microfluidic electrochemical cell for in situ structural characterization of amorphous thin-film catalysts using high-energy X-ray scattering. JOURNAL OF SYNCHROTRON RADIATION 2019; 26:1600-1611. [PMID: 31490150 PMCID: PMC6730625 DOI: 10.1107/s1600577519007240] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/13/2019] [Accepted: 05/19/2019] [Indexed: 06/10/2023]
Abstract
Porous, high-surface-area electrode architectures are described that allow structural characterization of interfacial amorphous thin films with high spatial resolution under device-relevant functional electrochemical conditions using high-energy X-ray (>50 keV) scattering and pair distribution function (PDF) analysis. Porous electrodes were fabricated from glass-capillary array membranes coated with conformal transparent conductive oxide layers, consisting of either a 40 nm-50 nm crystalline indium tin oxide or a 100 nm-150 nm-thick amorphous indium zinc oxide deposited by atomic layer deposition. These porous electrodes solve the problem of insufficient interaction volumes for catalyst thin films in two-dimensional working electrode designs and provide sufficiently low scattering backgrounds to enable high-resolution signal collection from interfacial thin-film catalysts. For example, PDF measurements were readily obtained with 0.2 Å spatial resolution for amorphous cobalt oxide films with thicknesses down to 60 nm when deposited on a porous electrode with 40 µm-diameter pores. This level of resolution resolves the cobaltate domain size and structure, the presence of defect sites assigned to the domain edges, and the changes in fine structure upon redox state change that are relevant to quantitative structure-function modeling. The results suggest the opportunity to leverage the porous, electrode architectures for PDF analysis of nanometre-scale surface-supported molecular catalysts. In addition, a compact 3D-printed electrochemical cell in a three-electrode configuration is described which is designed to allow for simultaneous X-ray transmission and electrolyte flow through the porous working electrode.
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Affiliation(s)
- Gihan Kwon
- Argonne Northwestern Solar Energy Research (ANSER) Center, Northwestern University, 2145 Sheridan Road, Tech Room L110, Evanston, IL 60208-3113, USA
- Northwestern-Argonne Institute of Science and Engineering, Northwestern University, 2205 Tech Drive, Evanston, IL 60208, USA
- Materials Science Division, Argonne National Laboratory, 9700 South Cass Ave, Lemont, IL 60439, USA
- Chemical Sciences and Engineering Division, Argonne National Laboratory, 9700 South Cass Ave, Lemont, IL 60439, USA
| | - Yeong-Ho Cho
- Nano Fabrication Laboratory, Research Institute of Advanced Materials, Department of Materials Science and Engineering, Seoul National University, 599 Gwanak-ro, Gwanak-gu 151-744, South Korea
| | - Ki-Bum Kim
- Nano Fabrication Laboratory, Research Institute of Advanced Materials, Department of Materials Science and Engineering, Seoul National University, 599 Gwanak-ro, Gwanak-gu 151-744, South Korea
| | - Jonathan D. Emery
- Materials Science Division, Argonne National Laboratory, 9700 South Cass Ave, Lemont, IL 60439, USA
| | - In Soo Kim
- Materials Science Division, Argonne National Laboratory, 9700 South Cass Ave, Lemont, IL 60439, USA
| | - Xiaoyi Zhang
- X-ray Science Division, Argonne National Laboratory, 9700 South Cass Ave, Lemont, IL 60439, USA
| | - Alex B. F. Martinson
- Materials Science Division, Argonne National Laboratory, 9700 South Cass Ave, Lemont, IL 60439, USA
| | - Davd M. Tiede
- Chemical Sciences and Engineering Division, Argonne National Laboratory, 9700 South Cass Ave, Lemont, IL 60439, USA
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28
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Kowalski D, Kiuchi H, Motohashi T, Aoki Y, Habazaki H. Activation of Catalytically Active Edge-Sharing Domains in Ca 2FeCoO 5 for Oxygen Evolution Reaction in Highly Alkaline Media. ACS APPLIED MATERIALS & INTERFACES 2019; 11:28823-28829. [PMID: 31339683 DOI: 10.1021/acsami.9b06854] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Rechargeable zinc-air batteries are considered as one of the possible candidates to replace conventional lithium-ion batteries. One of the requirements for effective battery operation is an oxygen evolution reaction (OER) that needs to be generated in a highly alkaline electrolyte. The A2BB'O5 brownmillerite-type Ca2FeCoO5 electrocatalyst having a 57 Pbcm symmetry exhibits very high electrocatalytic activity toward OER in 4 mol dm-3 KOH. Our studies show that the electrocatalyst undergoes bulk amorphization upon OER and adequately activates catalytically active domains. The synchrotron radiation studies using the extended X-ray absorption fine structure (EXAFS) technique show that the central structural unit found in the polarized Ca2FeCoO5 is a cluster of edge-sharing CoO6 octahedra. The electrochemical data indicate that OER preferentially takes place on the edge-sharing CoO6 octahedra catalytic centers reconstructed in the brownmillerite-type electrocatalyst. The EXAFS second shell peaks at an interatomic distance of 2.8 Å are the fingerprints of the catalytically active domains.
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Affiliation(s)
- Damian Kowalski
- Faculty of Engineering , Hokkaido University , N13W8, Sapporo 060-8628 , Japan
| | - Hisao Kiuchi
- Office of Society-Academia Collaboration for Innovation , Kyoto University , Kyoto 611-0011 , Japan
| | - Teruki Motohashi
- Department of Materials and Life Chemistry , Kanagawa University , Yokohama , Kanagawa 221-8686 , Japan
| | - Yoshitaka Aoki
- Faculty of Engineering , Hokkaido University , N13W8, Sapporo 060-8628 , Japan
| | - Hiroki Habazaki
- Faculty of Engineering , Hokkaido University , N13W8, Sapporo 060-8628 , Japan
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29
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Pasquini C, Zaharieva I, González-Flores D, Chernev P, Mohammadi MR, Guidoni L, Smith RDL, Dau H. H/D Isotope Effects Reveal Factors Controlling Catalytic Activity in Co-Based Oxides for Water Oxidation. J Am Chem Soc 2019; 141:2938-2948. [PMID: 30650965 DOI: 10.1021/jacs.8b10002] [Citation(s) in RCA: 47] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Understanding the mechanism for electrochemical water oxidation is important for the development of more efficient catalysts for artificial photosynthesis. A basic step is the proton-coupled electron transfer, which enables accumulation of oxidizing equivalents without buildup of a charge. We find that substituting deuterium for hydrogen resulted in an 87% decrease in the catalytic activity for water oxidation on Co-based amorphous-oxide catalysts at neutral pH, while 16O-to-18O substitution lead to a 10% decrease. In situ visible and quasi-in situ X-ray absorption spectroscopy reveal that the hydrogen-to-deuterium isotopic substitution induces an equilibrium isotope effect that shifts the oxidation potentials positively by approximately 60 mV for the proton coupled CoII/III and CoIII/IV electron transfer processes. Time-resolved spectroelectrochemical measurements indicate the absence of a kinetic isotope effect, implying that the precatalytic proton-coupled electron transfer happens through a stepwise mechanism in which electron transfer is rate-determining. An observed correlation between Co oxidation states and catalytic current for both isotopic conditions indicates that the applied potential has no direct effect on the catalytic rate, which instead depends exponentially on the average Co oxidation state. These combined results provide evidence that neither proton nor electron transfer is involved in the catalytic rate-determining step. We propose a mechanism with an active species composed by two adjacent CoIV atoms and a rate-determining step that involves oxygen-oxygen bond formation and compare it with models proposed in the literature.
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Affiliation(s)
- Chiara Pasquini
- Department of Physics , Freie Universität Berlin , Arnimallee 14 , 14195 Berlin , Germany
| | - Ivelina Zaharieva
- Department of Physics , Freie Universität Berlin , Arnimallee 14 , 14195 Berlin , Germany
| | - Diego González-Flores
- Department of Physics , Freie Universität Berlin , Arnimallee 14 , 14195 Berlin , Germany
| | - Petko Chernev
- Department of Physics , Freie Universität Berlin , Arnimallee 14 , 14195 Berlin , Germany
| | - Mohammad Reza Mohammadi
- Department of Physics , Freie Universität Berlin , Arnimallee 14 , 14195 Berlin , Germany.,Department of Physics , University of Sistan and Baluchestan , Zahedan , 98167-45845 , Iran
| | - Leonardo Guidoni
- Dipartimento di Scienze Fisiche e Chimiche , Università degli studi dell'Aquila,Via Vetoio (Coppito) , 67100 L'Aquila , Italy
| | - Rodney D L Smith
- Department of Physics , Freie Universität Berlin , Arnimallee 14 , 14195 Berlin , Germany.,Department of Chemistry , University of Waterloo , 200 University Avenue W , N2L 3G1 Waterloo , ON , Canada
| | - Holger Dau
- Department of Physics , Freie Universität Berlin , Arnimallee 14 , 14195 Berlin , Germany
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30
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Villalobos J, González-Flores D, Klingan K, Chernev P, Kubella P, Urcuyo R, Pasquini C, Mohammadi MR, Smith RDL, Montero ML, Dau H. Structural and functional role of anions in electrochemical water oxidation probed by arsenate incorporation into cobalt-oxide materials. Phys Chem Chem Phys 2019; 21:12485-12493. [DOI: 10.1039/c9cp01754b] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Arsenate ions are incorporated in amorphous cobalt oxide catalysts at the periphery of the lattice or substituting cobalt ions.
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Affiliation(s)
- Javier Villalobos
- Centro de Electroquímica y Energía Química (CELEQ) and Escuela de Química
- Universidad de Costa Rica
- San José
- Costa Rica
| | - Diego González-Flores
- Centro de Electroquímica y Energía Química (CELEQ) and Escuela de Química
- Universidad de Costa Rica
- San José
- Costa Rica
- Department of Physics
| | | | - Petko Chernev
- Department of Physics
- Freie Universität Berlin
- 14195 Berlin
- Germany
| | - Paul Kubella
- Department of Physics
- Freie Universität Berlin
- 14195 Berlin
- Germany
| | - Roberto Urcuyo
- Centro de Electroquímica y Energía Química (CELEQ) and Escuela de Química
- Universidad de Costa Rica
- San José
- Costa Rica
| | - Chiara Pasquini
- Department of Physics
- Freie Universität Berlin
- 14195 Berlin
- Germany
| | | | | | - Mavis L. Montero
- Centro de Investigación en Ciencia e Ingeniería de Materiales (CICIMA) and Escuela de Química
- Universidad de Costa Rica
- San José
- Costa Rica
| | - Holger Dau
- Department of Physics
- Freie Universität Berlin
- 14195 Berlin
- Germany
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31
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Quintana A, Menéndez E, Liedke MO, Butterling M, Wagner A, Sireus V, Torruella P, Estradé S, Peiró F, Dendooven J, Detavernier C, Murray PD, Gilbert DA, Liu K, Pellicer E, Nogues J, Sort J. Voltage-Controlled ON-OFF Ferromagnetism at Room Temperature in a Single Metal Oxide Film. ACS NANO 2018; 12:10291-10300. [PMID: 30256610 DOI: 10.1021/acsnano.8b05407] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Electric-field-controlled magnetism can boost energy efficiency in widespread applications. However, technologically, this effect is facing important challenges: mechanical failure in strain-mediated piezoelectric/magnetostrictive devices, dearth of room-temperature multiferroics, or stringent thickness limitations in electrically charged metallic films. Voltage-driven ionic motion (magneto-ionics) circumvents most of these drawbacks while exhibiting interesting magnetoelectric phenomena. Nevertheless, magneto-ionics typically requires heat treatments and multicomponent heterostructures. Here we report on the electrolyte-gated and defect-mediated O and Co transport in a Co3O4 single layer which allows for room-temperature voltage-controlled ON-OFF ferromagnetism (magnetic switch) via internal reduction/oxidation processes. Negative voltages partially reduce Co3O4 to Co (ferromagnetism: ON), resulting in graded films including Co- and O-rich areas. Positive bias oxidizes Co back to Co3O4 (paramagnetism: OFF). This electric-field-induced atomic-scale reconfiguration process is compositionally, structurally, and magnetically reversible and self-sustained, since no oxygen source other than the Co3O4 itself is required. This process could lead to electric-field-controlled device concepts for spintronics.
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Affiliation(s)
- Alberto Quintana
- Departament de Física , Universitat Autònoma de Barcelona , E-08193 Cerdanyola del Vallès , Spain
| | - Enric Menéndez
- Departament de Física , Universitat Autònoma de Barcelona , E-08193 Cerdanyola del Vallès , Spain
| | - Maciej O Liedke
- Institute of Radiation Physics , Helmholtz-Center Dresden-Rossendorf , Dresden 01328 , Germany
| | - Maik Butterling
- Institute of Radiation Physics , Helmholtz-Center Dresden-Rossendorf , Dresden 01328 , Germany
| | - Andreas Wagner
- Institute of Radiation Physics , Helmholtz-Center Dresden-Rossendorf , Dresden 01328 , Germany
| | - Veronica Sireus
- Departament de Física , Universitat Autònoma de Barcelona , E-08193 Cerdanyola del Vallès , Spain
| | - Pau Torruella
- LENS-MIND, Departament d'Enginyeria Electrònica i Biomèdica , Universitat de Barcelona , 08028 Barcelona , Spain
- Institute of Nanoscience and Nanotechnology (IN2UB) , Universitat de Barcelona , 08028 Barcelona , Spain
| | - Sònia Estradé
- LENS-MIND, Departament d'Enginyeria Electrònica i Biomèdica , Universitat de Barcelona , 08028 Barcelona , Spain
- Institute of Nanoscience and Nanotechnology (IN2UB) , Universitat de Barcelona , 08028 Barcelona , Spain
| | - Francesca Peiró
- LENS-MIND, Departament d'Enginyeria Electrònica i Biomèdica , Universitat de Barcelona , 08028 Barcelona , Spain
- Institute of Nanoscience and Nanotechnology (IN2UB) , Universitat de Barcelona , 08028 Barcelona , Spain
| | - Jolien Dendooven
- Department of Solid State Sciences, CoCooN , Ghent University , Krijgslaan 281/S1 , 9000 Ghent , Belgium
| | - Christophe Detavernier
- Department of Solid State Sciences, CoCooN , Ghent University , Krijgslaan 281/S1 , 9000 Ghent , Belgium
| | - Peyton D Murray
- Physics Department , University of California , Davis , California 95616 , United States
| | - Dustin Allen Gilbert
- NIST Center for Neutron Research , National Institute of Standards and Technology , Gaithersburg , Maryland 20899 , United States
- Materials Science and Engineering , University of Tennessee , Knoxville , Tennessee 37996 , United States
| | - Kai Liu
- Physics Department , University of California , Davis , California 95616 , United States
- Department of Physics , Georgetown University , Washington , D.C. 20057 , United States
| | - Eva Pellicer
- Departament de Física , Universitat Autònoma de Barcelona , E-08193 Cerdanyola del Vallès , Spain
| | - Josep Nogues
- Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and BIST , Campus UAB, Bellaterra , E-08193 Barcelona , Spain
- Institució Catalana de Recerca i Estudis Avançats (ICREA) , Pg. Lluís Companys 23 , E-08010 Barcelona , Spain
| | - Jordi Sort
- Departament de Física , Universitat Autònoma de Barcelona , E-08193 Cerdanyola del Vallès , Spain
- Institució Catalana de Recerca i Estudis Avançats (ICREA) , Pg. Lluís Companys 23 , E-08010 Barcelona , Spain
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32
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Unified structural motifs of the catalytically active state of Co(oxyhydr)oxides during the electrochemical oxygen evolution reaction. Nat Catal 2018. [DOI: 10.1038/s41929-018-0141-2] [Citation(s) in RCA: 274] [Impact Index Per Article: 45.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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33
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Brodsky CN, Passard G, Ullman AM, Jaramillo DE, Bloch ED, Huynh M, Gygi D, Costentin C, Nocera DG. Oxygen activation at a dicobalt centre of a dipyridylethane naphthyridine complex. Dalton Trans 2018; 47:11903-11908. [PMID: 29942938 DOI: 10.1039/c8dt01598h] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
The mechanism of oxygen activation at a dicobalt bis-μ-hydroxo core is probed by the implementation of synthetic methods to isolate reaction intermediates. Reduction of a dicobalt(iii,iii) core ligated by the polypyridyl ligand dipyridylethane naphthyridine (DPEN) by two electrons and subsequent protonation result in the release of one water moiety to furnish a dicobalt(ii,ii) center with an open binding site. This reduced core may be independently isolated by chemical reduction. Variable-temperature 1H NMR and SQUID magnetometry reveal the reduced dicobalt(ii,ii) intermediate to consist of two low spin Co(ii) centers coupled antiferromagnetically. Binding of O2 to the open coordination site of the dicobalt(ii,ii) core results in the production of an oxygen adduct, which is proposed to be a dicobalt(iii,iii) peroxo. Electrochemical studies show that the addition of two electrons results in cleavage of the O-O bond.
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Affiliation(s)
- Casey N Brodsky
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, USA.
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34
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Fester J, Makoveev A, Grumelli D, Gutzler R, Sun Z, Rodríguez-Fernández J, Kern K, Lauritsen JV. The Structure of the Cobalt Oxide/Au Catalyst Interface in Electrochemical Water Splitting. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201804417] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Jakob Fester
- Interdisciplinary Nanoscience Center (iNANO); Aarhus University; 8000 Aarhus C Denmark
| | - Anton Makoveev
- CEITEC BUT; Brno University of Technology; Purkynova 123 621 00 Brno Czech Republic
| | - Doris Grumelli
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA); Facultad de Ciencias Exactas; Universidad Nacional de La Plata-CONICET; 1900 La Plata Argentina
| | - Rico Gutzler
- Max Planck Institute for Solid State Research; 70569 Stuttgart Germany
| | - Zhaozong Sun
- Interdisciplinary Nanoscience Center (iNANO); Aarhus University; 8000 Aarhus C Denmark
| | | | - Klaus Kern
- Max Planck Institute for Solid State Research; 70569 Stuttgart Germany
- Institute de Physique; Ecole Polytechnique Fédérale de Lausanne; 1015 Lausanne Switzerland
| | - Jeppe V. Lauritsen
- Interdisciplinary Nanoscience Center (iNANO); Aarhus University; 8000 Aarhus C Denmark
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35
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Fester J, Makoveev A, Grumelli D, Gutzler R, Sun Z, Rodríguez-Fernández J, Kern K, Lauritsen JV. The Structure of the Cobalt Oxide/Au Catalyst Interface in Electrochemical Water Splitting. Angew Chem Int Ed Engl 2018; 57:11893-11897. [DOI: 10.1002/anie.201804417] [Citation(s) in RCA: 63] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2018] [Revised: 06/16/2018] [Indexed: 11/10/2022]
Affiliation(s)
- Jakob Fester
- Interdisciplinary Nanoscience Center (iNANO); Aarhus University; 8000 Aarhus C Denmark
| | - Anton Makoveev
- CEITEC BUT; Brno University of Technology; Purkynova 123 621 00 Brno Czech Republic
| | - Doris Grumelli
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA); Facultad de Ciencias Exactas; Universidad Nacional de La Plata-CONICET; 1900 La Plata Argentina
| | - Rico Gutzler
- Max Planck Institute for Solid State Research; 70569 Stuttgart Germany
| | - Zhaozong Sun
- Interdisciplinary Nanoscience Center (iNANO); Aarhus University; 8000 Aarhus C Denmark
| | | | - Klaus Kern
- Max Planck Institute for Solid State Research; 70569 Stuttgart Germany
- Institute de Physique; Ecole Polytechnique Fédérale de Lausanne; 1015 Lausanne Switzerland
| | - Jeppe V. Lauritsen
- Interdisciplinary Nanoscience Center (iNANO); Aarhus University; 8000 Aarhus C Denmark
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36
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Kwon G, Jang H, Lee JS, Mane A, Mandia DJ, Soltau SR, Utschig LM, Martinson ABF, Tiede DM, Kim H, Kim J. Resolution of Electronic and Structural Factors Underlying Oxygen-Evolving Performance in Amorphous Cobalt Oxide Catalysts. J Am Chem Soc 2018; 140:10710-10720. [PMID: 30028604 DOI: 10.1021/jacs.8b02719] [Citation(s) in RCA: 41] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Non-noble-metal, thin-film oxides are widely investigated as promising catalysts for oxygen evolution reactions (OER). Amorphous cobalt oxide films electrochemically formed in the presence of borate (CoBi) and phosphate (CoPi) share a common cobaltate domain building block, but differ significantly in OER performance that derives from different electron-proton charge transport properties. Here, we use a combination of L edge synchrotron X-ray absorption (XAS), resonant X-ray emission (RXES), resonant inelastic X-ray scattering (RIXS), resonant Raman (RR) scattering, and high-energy X-ray pair distribution function (PDF) analyses that identify electronic and structural factors correlated to the charge transport differences for CoPi and CoBi. The analyses show that CoBi is composed primarily of cobalt in octahedral coordination, whereas CoPi contains approximately 17% tetrahedral Co(II), with the remainder in octahedral coordination. Oxygen-mediated 4 p-3 d hybridization through Co-O-Co bonding was detected by RXES and the intersite dd excitation was observed by RIXS in CoBi, but not in CoPi. RR shows that CoBi resembles a disordered layered LiCoO2-like structure, whereas CoPi is amorphous. Distinct domain models in the nanometer range for CoBi and CoPi have been proposed on the basis of the PDF analysis coupled to XAS data. The observed differences provide information on electronic and structural factors that enhance oxygen evolving catalysis performance.
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Affiliation(s)
| | - Hoyoung Jang
- Stanford Synchrotron Radiation Light Source , SLAC National Accelerator Laboratory , Menlo Park , California 94025 , United States
| | - Jun-Sik Lee
- Stanford Synchrotron Radiation Light Source , SLAC National Accelerator Laboratory , Menlo Park , California 94025 , United States
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37
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Reith L, Lienau K, Cook DS, Moré R, Walton RI, Patzke GR. Monitoring the Hydrothermal Growth of Cobalt Spinel Water Oxidation Catalysts: From Preparative History to Catalytic Activity. Chemistry 2018; 24:18424-18435. [DOI: 10.1002/chem.201801565] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2018] [Indexed: 11/10/2022]
Affiliation(s)
- Lukas Reith
- Department of ChemistryUniversity of Zurich Winterthurerstrasse 190 8057 Zurich Switzerland
| | - Karla Lienau
- Department of ChemistryUniversity of Zurich Winterthurerstrasse 190 8057 Zurich Switzerland
| | - Daniel S. Cook
- Department of ChemistryUniversity of Warwick Coventry CV4 7AL UK
| | - René Moré
- Department of ChemistryUniversity of Zurich Winterthurerstrasse 190 8057 Zurich Switzerland
| | | | - Greta R. Patzke
- Department of ChemistryUniversity of Zurich Winterthurerstrasse 190 8057 Zurich Switzerland
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38
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Schwarz M, Faisal F, Mohr S, Hohner C, Werner K, Xu T, Skála T, Tsud N, Prince KC, Matolín V, Lykhach Y, Libuda J. Structure-Dependent Dissociation of Water on Cobalt Oxide. J Phys Chem Lett 2018; 9:2763-2769. [PMID: 29741895 DOI: 10.1021/acs.jpclett.8b01033] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Understanding the correlation between structure and reactivity of oxide surfaces is vital for the rational design of catalytic materials. In this work, we demonstrate the exceptional degree of structure sensitivity of the water dissociation reaction for one of the most important materials in catalysis and electrocatalysis. We studied H2O on two atomically defined cobalt oxide surfaces, CoO(100) and Co3O4(111). Both surfaces are terminated by O2- and Co2+ in different coordination. By infrared reflection absorption spectroscopy and synchrotron radiation photoelectron spectroscopy we show that H2O adsorbs molecularly on CoO(100), while it dissociates and forms very strongly bound OH and partially dissociated (H2O) n(OH) m clusters on Co3O4(111). We rationalize this structure dependence by the coordination number of surface Co2+. Our results show that specific well-ordered cobalt oxide surfaces interact very strongly with H2O whereas others do not. We propose that this structure dependence plays a key role in catalysis with cobalt oxide nanomaterials.
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Affiliation(s)
- Matthias Schwarz
- Lehrstuhl für Physikalische Chemie II , Friedrich-Alexander-Universität Erlangen-Nürnberg , Egerlandstraße 3 , 91058 Erlangen , Germany
| | - Firas Faisal
- Lehrstuhl für Physikalische Chemie II , Friedrich-Alexander-Universität Erlangen-Nürnberg , Egerlandstraße 3 , 91058 Erlangen , Germany
| | - Susanne Mohr
- Lehrstuhl für Physikalische Chemie II , Friedrich-Alexander-Universität Erlangen-Nürnberg , Egerlandstraße 3 , 91058 Erlangen , Germany
| | - Chantal Hohner
- Lehrstuhl für Physikalische Chemie II , Friedrich-Alexander-Universität Erlangen-Nürnberg , Egerlandstraße 3 , 91058 Erlangen , Germany
| | - Kristin Werner
- Lehrstuhl für Physikalische Chemie II , Friedrich-Alexander-Universität Erlangen-Nürnberg , Egerlandstraße 3 , 91058 Erlangen , Germany
| | - Tao Xu
- Lehrstuhl für Physikalische Chemie II , Friedrich-Alexander-Universität Erlangen-Nürnberg , Egerlandstraße 3 , 91058 Erlangen , Germany
| | - Tomáš Skála
- Department of Surface and Plasma Science , Faculty of Mathematics and Physics, Charles University , V Holešovičkách 2 , 18000 Prague , Czech Republic
| | - Nataliya Tsud
- Department of Surface and Plasma Science , Faculty of Mathematics and Physics, Charles University , V Holešovičkách 2 , 18000 Prague , Czech Republic
| | - Kevin C Prince
- Elettra-Sincrotrone Trieste SCpA , Strada Statale 14, km 163.5 , 34149 Basovizza-Trieste , Italy
| | - Vladimír Matolín
- Department of Surface and Plasma Science , Faculty of Mathematics and Physics, Charles University , V Holešovičkách 2 , 18000 Prague , Czech Republic
| | - Yaroslava Lykhach
- Lehrstuhl für Physikalische Chemie II , Friedrich-Alexander-Universität Erlangen-Nürnberg , Egerlandstraße 3 , 91058 Erlangen , Germany
| | - Jörg Libuda
- Lehrstuhl für Physikalische Chemie II , Friedrich-Alexander-Universität Erlangen-Nürnberg , Egerlandstraße 3 , 91058 Erlangen , Germany
- Erlangen Catalysis Resource Center and Interdisciplinary Center Interface Controlled Processes , Friedrich-Alexander-Universität Erlangen-Nürnberg , 91058 Erlangen , Germany
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39
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Olshansky L, Huerta-Lavorie R, Nguyen AI, Vallapurackal J, Furst A, Tilley TD, Borovik AS. Artificial Metalloproteins Containing Co 4O 4 Cubane Active Sites. J Am Chem Soc 2018; 140:2739-2742. [PMID: 29401385 PMCID: PMC5866047 DOI: 10.1021/jacs.7b13052] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Artificial metalloproteins (ArMs) containing Co4O4 cubane active sites were constructed via biotin-streptavidin technology. Stabilized by hydrogen bonds (H-bonds), terminal and cofacial CoIII-OH2 moieties are observed crystallographically in a series of immobilized cubane sites. Solution electrochemistry provided correlations of oxidation potential and pH. For variants containing Ser and Phe adjacent to the metallocofactor, 1e-/1H+ chemistry predominates until pH 8, above which the oxidation becomes pH-independent. Installation of Tyr proximal to the Co4O4 active site provided a single H-bond to one of a set of cofacial CoIII-OH2 groups. With this variant, multi-e-/multi-H+ chemistry is observed, along with a change in mechanism at pH 9.5 that is consistent with Tyr deprotonation. With structural similarities to both the oxygen-evolving complex of photosystem II (H-bonded Tyr) and to thin film water oxidation catalysts (Co4O4 core), these findings bridge synthetic and biological systems for water oxidation, highlighting the importance of secondary sphere interactions in mediating multi-e-/multi-H+ reactivity.
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Affiliation(s)
- Lisa Olshansky
- Department of Chemistry, University of California, Irvine , Irvine, California 92697, United States
| | - Raúl Huerta-Lavorie
- Department of Chemistry, University of California, Berkeley , Berkeley, California 94720, United States
| | - Andy I Nguyen
- Department of Chemistry, University of California, Berkeley , Berkeley, California 94720, United States
| | - Jaicy Vallapurackal
- Department of Chemistry, University of California, Irvine , Irvine, California 92697, United States
| | - Ariel Furst
- 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
- Chemical Science Division, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States
| | - A S Borovik
- Department of Chemistry, University of California, Irvine , Irvine, California 92697, United States
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40
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Chandra D, Tanaka K, Takeuchi R, Abe N, Togashi T, Kurihara M, Saito K, Yui T, Yagi M. Facile Templateless Fabrication of a Cobalt Oxyhydroxide Nanosheet Film with Nanoscale Porosity as an Efficient Electrocatalyst for Water Oxidation. CHEMPHOTOCHEM 2018. [DOI: 10.1002/cptc.201700200] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Affiliation(s)
- Debraj Chandra
- Department of Materials Science and Technology, Faculty of Engineering; Niigata University; 8050 Ikarashi-2 Niigata 950-2181 Japan
| | - Kou Tanaka
- Department of Materials Science and Technology, Faculty of Engineering; Niigata University; 8050 Ikarashi-2 Niigata 950-2181 Japan
| | - Ryouchi Takeuchi
- Department of Materials Science and Technology, Faculty of Engineering; Niigata University; 8050 Ikarashi-2 Niigata 950-2181 Japan
| | - Naoto Abe
- Department of Materials Science and Technology, Faculty of Engineering; Niigata University; 8050 Ikarashi-2 Niigata 950-2181 Japan
| | - Takanari Togashi
- Department of Material and Biological Chemistry, Faculty of Science; Yamagata University; 1-4-12 Kojirakawa-machi Yamagata 990-8560 Japan
| | - Masato Kurihara
- Department of Material and Biological Chemistry, Faculty of Science; Yamagata University; 1-4-12 Kojirakawa-machi Yamagata 990-8560 Japan
| | - Kenji Saito
- Department of Materials Science and Technology, Faculty of Engineering; Niigata University; 8050 Ikarashi-2 Niigata 950-2181 Japan
| | - Tatsuto Yui
- Department of Materials Science and Technology, Faculty of Engineering; Niigata University; 8050 Ikarashi-2 Niigata 950-2181 Japan
| | - Masayuki Yagi
- Department of Materials Science and Technology, Faculty of Engineering; Niigata University; 8050 Ikarashi-2 Niigata 950-2181 Japan
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41
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Lassalle-Kaiser B, Gul S, Kern J, Yachandra VK, Yano J. In situ/Operando studies of electrocatalysts using hard X-ray spectroscopy. JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA 2017; 221:18-27. [PMID: 29515287 PMCID: PMC5836735 DOI: 10.1016/j.elspec.2017.05.001] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
This review focuses on the use of X-ray absorption and emission spectroscopy techniques using hard X-rays to study electrocatalysts under in situ/operando conditions. We describe the importance and the versatility of methods in the study of electrodes in contact with the electrolytes, when being cycled through the catalytic potentials during the progress of the oxygen-evolution, oxygen reduction and hydrogen evolution reactions. The catalytic oxygen evolution reaction is illustrated with examples using Co, Ni and Mn oxides, and Mo and Co sulfides are used as an example for the hydrogen evolution reaction. A bimetallic, bifunctional oxygen evolving and oxygen reducing Ni/Mn oxide is also presented. The various advantages and constraints in the use of these techniques and the future outlook are discussed.
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Affiliation(s)
| | - Sheraz Gul
- Molecular Biophysics and Integrated Bioimaging Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - Jan Kern
- Molecular Biophysics and Integrated Bioimaging Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
- LCLS, SLAC National Accelerator Laboratory, Menlo Park, CA, 94025, USA
| | - Vittal K. Yachandra
- Molecular Biophysics and Integrated Bioimaging Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - Junko Yano
- Molecular Biophysics and Integrated Bioimaging Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
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42
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Song F, Moré R, Schilling M, Smolentsev G, Azzaroli N, Fox T, Luber S, Patzke GR. {Co4O4} and {CoxNi4–xO4} Cubane Water Oxidation Catalysts as Surface Cut-Outs of Cobalt Oxides. J Am Chem Soc 2017; 139:14198-14208. [DOI: 10.1021/jacs.7b07361] [Citation(s) in RCA: 80] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Fangyuan Song
- Department of Chemistry, University of Zurich, Winterthurerstrasse 190, CH-8057 Zurich, Switzerland
| | - René Moré
- Department of Chemistry, University of Zurich, Winterthurerstrasse 190, CH-8057 Zurich, Switzerland
| | - Mauro Schilling
- Department of Chemistry, University of Zurich, Winterthurerstrasse 190, CH-8057 Zurich, Switzerland
| | | | | | - Thomas Fox
- Department of Chemistry, University of Zurich, Winterthurerstrasse 190, CH-8057 Zurich, Switzerland
| | - Sandra Luber
- Department of Chemistry, University of Zurich, Winterthurerstrasse 190, CH-8057 Zurich, Switzerland
| | - Greta R. Patzke
- Department of Chemistry, University of Zurich, Winterthurerstrasse 190, CH-8057 Zurich, Switzerland
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43
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Abstract
Principles for designing self-healing water-splitting catalysts are presented together with a formal kinetics model to account for the key chemical steps needed for self-healing. Self-healing may be realized if the catalysts are able to self-assemble at applied potentials less than that needed for catalyst turnover. Solution pH provides a convenient handle for controlling the potential of these two processes, as demonstrated for the cobalt phosphate (CoPi) water-splitting catalyst. For Co2+ ion that appears in solution due to leaching from the catalyst during turnover, a quantitative description for the kinetics of the redeposition of the ion during the self-healing process has been derived. The model reveals that OER activity of CoPi occurs with negligible film dissolution in neutral pH for typical cell geometries and buffer concentrations.
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44
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Platero-Prats AE, League AB, Bernales V, Ye J, Gallington LC, Vjunov A, Schweitzer NM, Li Z, Zheng J, Mehdi BL, Stevens AJ, Dohnalkova A, Balasubramanian M, Farha OK, Hupp JT, Browning ND, Fulton JL, Camaioni DM, Lercher JA, Truhlar DG, Gagliardi L, Cramer CJ, Chapman KW. Bridging Zirconia Nodes within a Metal–Organic Framework via Catalytic Ni-Hydroxo Clusters to Form Heterobimetallic Nanowires. J Am Chem Soc 2017; 139:10410-10418. [DOI: 10.1021/jacs.7b04997] [Citation(s) in RCA: 66] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Ana E. Platero-Prats
- X-ray
Science Division, Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, United States
| | - Aaron B. League
- Department
of Chemistry, Minnesota Supercomputing Institute, and Chemical Theory
Center, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Varinia Bernales
- Department
of Chemistry, Minnesota Supercomputing Institute, and Chemical Theory
Center, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Jingyun Ye
- Department
of Chemistry, Minnesota Supercomputing Institute, and Chemical Theory
Center, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Leighanne C. Gallington
- X-ray
Science Division, Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, United States
| | | | | | | | | | | | | | | | - Mahalingam Balasubramanian
- X-ray
Science Division, Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, United States
| | - Omar K. Farha
- Department
of Chemistry, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia
| | | | - Nigel D. Browning
- Materials
Science and Engineering, University of Washington, Seattle, Washington 98195, United States
| | | | | | - Johannes A. Lercher
- Department
of Chemistry and Catalysis Research Institute, Technische Universität München, 85748 Garching, Germany
| | - Donald G. Truhlar
- Department
of Chemistry, Minnesota Supercomputing Institute, and Chemical Theory
Center, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Laura Gagliardi
- Department
of Chemistry, Minnesota Supercomputing Institute, and Chemical Theory
Center, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Christopher J. Cramer
- Department
of Chemistry, Minnesota Supercomputing Institute, and Chemical Theory
Center, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Karena W. Chapman
- X-ray
Science Division, Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, United States
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45
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Terban MW, Shi C, Silbernagel R, Clearfield A, Billinge SJL. Local Environment of Terbium(III) Ions in Layered Nanocrystalline Zirconium(IV) Phosphonate-Phosphate Ion Exchange Materials. Inorg Chem 2017; 56:8837-8846. [PMID: 28704045 DOI: 10.1021/acs.inorgchem.7b00666] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The structures of Zr(IV) phosphonate-phosphate based, unconventional metal organic framework materials have been determined using atomic pair distribution function analysis of high energy, X-ray total scattering diffraction data. They are found to form as nanocrystalline layers of Zr phosphate, similar to the bulk, but with a high degree of interlayer disorder and intermediate intralayer order extending around 5 nm. These materials are of interest for their high selectivity for 3+ lanthanide ions. To investigate the mechanism of the selectivity, we utilize difference pair distribution function analysis to extract the local structural environment of Tb3+ ions loaded into the framework. The ions are found to sit between the layers in a manner resembling the local environment of Tb in Scheelite-type terbium phosphate. By mapping this local structure onto that of the refined structure for zirconium-phenyl-phosphonate, we show how dangling oxygens from the phosphate groups, acting like nose hairs, are able to reorient to provide a friendly intercalation environment for the Tb3+ ions.
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Affiliation(s)
- Maxwell W Terban
- Department of Applied Physics and Applied Mathematics, Columbia University , New York, New York 10027, United States
| | - Chenyang Shi
- Department of Applied Physics and Applied Mathematics, Columbia University , New York, New York 10027, United States
| | - Rita Silbernagel
- Department of Chemistry, Texas A&M University , College Station, Texas 77843, United States
| | - Abraham Clearfield
- Department of Chemistry, Texas A&M University , College Station, Texas 77843, United States
| | - Simon J L Billinge
- Department of Applied Physics and Applied Mathematics, Columbia University , New York, New York 10027, United States.,Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory , Upton, New York 11973, United States
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46
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Favaro M, Yang J, Nappini S, Magnano E, Toma FM, Crumlin EJ, Yano J, Sharp ID. Understanding the Oxygen Evolution Reaction Mechanism on CoOx using Operando Ambient-Pressure X-ray Photoelectron Spectroscopy. J Am Chem Soc 2017; 139:8960-8970. [DOI: 10.1021/jacs.7b03211] [Citation(s) in RCA: 187] [Impact Index Per Article: 26.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Marco Favaro
- Advanced
Light Source, Lawrence Berkeley National Laboratory, One Cyclotron Road, Berkeley, California 94720, United States,
- Joint
Center for Artificial Photosynthesis, Lawrence Berkeley National Laboratory, One Cyclotron Road, Berkeley, California 94720, United States,
- Chemical
Sciences Division, Lawrence Berkeley National Laboratory, One Cyclotron
Road, Berkeley, California 94720, United States,
| | - Jinhui Yang
- Joint
Center for Artificial Photosynthesis, Lawrence Berkeley National Laboratory, One Cyclotron Road, Berkeley, California 94720, United States,
- Chemical
Sciences Division, Lawrence Berkeley National Laboratory, One Cyclotron
Road, Berkeley, California 94720, United States,
| | - Silvia Nappini
- IOM-CNR, Laboratorio TASC, Area
Science Park Basovizza, s.s. 14 km 163, 5 Basovizza, 34149 Trieste, Italy
| | - Elena Magnano
- IOM-CNR, Laboratorio TASC, Area
Science Park Basovizza, s.s. 14 km 163, 5 Basovizza, 34149 Trieste, Italy
| | - Francesca M. Toma
- Joint
Center for Artificial Photosynthesis, Lawrence Berkeley National Laboratory, One Cyclotron Road, Berkeley, California 94720, United States,
- Chemical
Sciences Division, Lawrence Berkeley National Laboratory, One Cyclotron
Road, Berkeley, California 94720, United States,
| | - Ethan J. Crumlin
- Advanced
Light Source, Lawrence Berkeley National Laboratory, One Cyclotron Road, Berkeley, California 94720, United States,
| | - Junko Yano
- Joint
Center for Artificial Photosynthesis, Lawrence Berkeley National Laboratory, One Cyclotron Road, Berkeley, California 94720, United States,
- Chemical
Sciences Division, Lawrence Berkeley National Laboratory, One Cyclotron
Road, Berkeley, California 94720, United States,
- Molecular
Biophysics and Integrated Bioimaging Division, Lawrence Berkeley National Laboratory, One Cyclotron Road, Berkeley, California 94720, United States
| | - Ian D. Sharp
- Joint
Center for Artificial Photosynthesis, Lawrence Berkeley National Laboratory, One Cyclotron Road, Berkeley, California 94720, United States,
- Chemical
Sciences Division, Lawrence Berkeley National Laboratory, One Cyclotron
Road, Berkeley, California 94720, United States,
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47
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de Araujo GLB, Benmore CJ, Byrn SR. Local Structure of Ion Pair Interaction in Lapatinib Amorphous Dispersions characterized by Synchrotron X-Ray diffraction and Pair Distribution Function Analysis. Sci Rep 2017; 7:46367. [PMID: 28397829 PMCID: PMC5387732 DOI: 10.1038/srep46367] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2017] [Accepted: 03/15/2017] [Indexed: 01/21/2023] Open
Abstract
For many years, the idea of analyzing atom-atom contacts in amorphous drug-polymer systems has been of major interest, because this method has always had the potential to differentiate between amorphous systems with domains and amorphous systems which are molecular mixtures. In this study, local structure of ionic and noninonic interactions were studied by High-Energy X-ray Diffraction and Pair Distribution Function (PDF) analysis in amorphous solid dispersions of lapatinib in hypromellose phthalate (HPMCP) and hypromellose (HPMC-E3). The strategy of extracting lapatinib intermolecular drug interactions from the total PDF x-ray pattern was successfully applied allowing the detection of distinct nearest neighbor contacts for the HPMC-E3 rich preparations showing that lapatinib molecules do not cluster in the same way as observed in HPMC-P, where ionic interactions are present. Orientational correlations up to nearest neighbor molecules at about 4.3 Å were observed for polymer rich samples; both observations showed strong correlation to the stability of the systems. Finally, the superior physical stability of 1:3 LP:HPMCP was consistent with the absence of significant intermolecular interactions in (∆) in the range of 3.0 to 6.0 Å, which are attributed to C-C, C-N and C-O nearest neighbor contacts present in drug-drug interactions.
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Affiliation(s)
- Gabriel L B de Araujo
- Department of Pharmacy, Faculty of Pharmaceutical Sciences, University of Sao Paulo, Sao Paulo, SP, 05508-900, Brazil.,Department of Industrial and Physical Pharmacy, Purdue University, West Lafayette, Indiana, 47906, United States
| | - Chris J Benmore
- X-ray Science Division, Advanced Photon Source, Argonne National Laboratory, Illinois, 60439, United States
| | - Stephen R Byrn
- Department of Industrial and Physical Pharmacy, Purdue University, West Lafayette, Indiana, 47906, United States
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48
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In situ characterization of cofacial Co(IV) centers in Co 4O 4 cubane: Modeling the high-valent active site in oxygen-evolving catalysts. Proc Natl Acad Sci U S A 2017; 114:3855-3860. [PMID: 28348217 DOI: 10.1073/pnas.1701816114] [Citation(s) in RCA: 64] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
Abstract
The Co4O4 cubane is a representative structural model of oxidic cobalt oxygen-evolving catalysts (Co-OECs). The Co-OECs are active when residing at two oxidation levels above an all-Co(III) resting state. This doubly oxidized Co(IV)2 state may be captured in a Co(III)2(IV)2 cubane. We demonstrate that the Co(III)2(IV)2 cubane may be electrochemically generated and the electronic properties of this unique high-valent state may be probed by in situ spectroscopy. Intervalence charge-transfer (IVCT) bands in the near-IR are observed for the Co(III)2(IV)2 cubane, and spectroscopic analysis together with electrochemical kinetics measurements reveal a larger reorganization energy and a smaller electron transfer rate constant for the doubly versus singly oxidized cubane. Spectroelectrochemical X-ray absorption data further reveal systematic spectral changes with successive oxidations from the cubane resting state. Electronic structure calculations correlated to experimental data suggest that this state is best represented as a localized, antiferromagnetically coupled Co(IV)2 dimer. The exchange coupling in the cofacial Co(IV)2 site allows for parallels to be drawn between the electronic structure of the Co4O4 cubane model system and the high-valent active site of the Co-OEC, with specific emphasis on the manifestation of a doubly oxidized Co(IV)2 center on O-O bond formation.
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49
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Yang F, Sliozberg K, Sinev I, Antoni H, Bähr A, Ollegott K, Xia W, Masa J, Grünert W, Cuenya BR, Schuhmann W, Muhler M. Synergistic Effect of Cobalt and Iron in Layered Double Hydroxide Catalysts for the Oxygen Evolution Reaction. CHEMSUSCHEM 2017; 10:156-165. [PMID: 27865059 DOI: 10.1002/cssc.201601272] [Citation(s) in RCA: 47] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/12/2016] [Revised: 11/18/2016] [Indexed: 06/06/2023]
Abstract
Co-based layered double hydroxide (LDH) catalysts with Fe and Al contents in the range of 15 to 45 at % were synthesized by an efficient coprecipitation method. In these catalysts, Fe3+ or Al3+ ions play an essential role as trivalent species to stabilize the LDH structure. The obtained catalysts were characterized by a comprehensive combination of surface- and bulk-sensitive techniques and were evaluated for the oxygen evolution reaction (OER) on rotating disk electrodes. The OER activity decreased upon increasing the Al content for the Co- and Al-based LDH catalysts, whereas a synergistic effect in Co- and Fe-based LDHs was observed, which resulted in an optimal Fe content of 35 at %. This catalyst was spray-coated on Ni foam electrodes and showed very good stability in a flow-through cell with a potential of approximately 1.53 V at 10 mA cm-2 in 1 m KOH for at least 48 h.
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Affiliation(s)
- Fengkai Yang
- Laboratory of Industrial Chemistry, Ruhr-University Bochum, Universitätsstr. 150, D-44780, Germany
| | - Kirill Sliozberg
- Analytical Chemistry and Center for Electrochemical Sciences (CES), Ruhr-University Bochum, Universitätsstr. 150, D-44780, Germany
| | - Ilya Sinev
- Department of Physics, Ruhr-University Bochum, Universitätsstr. 150, D-44780, Germany
| | - Hendrik Antoni
- Laboratory of Industrial Chemistry, Ruhr-University Bochum, Universitätsstr. 150, D-44780, Germany
| | - Alexander Bähr
- Laboratory of Industrial Chemistry, Ruhr-University Bochum, Universitätsstr. 150, D-44780, Germany
| | - Kevin Ollegott
- Laboratory of Industrial Chemistry, Ruhr-University Bochum, Universitätsstr. 150, D-44780, Germany
| | - Wei Xia
- Laboratory of Industrial Chemistry, Ruhr-University Bochum, Universitätsstr. 150, D-44780, Germany
| | - Justus Masa
- Analytical Chemistry and Center for Electrochemical Sciences (CES), Ruhr-University Bochum, Universitätsstr. 150, D-44780, Germany
| | - Wolfgang Grünert
- Laboratory of Industrial Chemistry, Ruhr-University Bochum, Universitätsstr. 150, D-44780, Germany
| | - Beatriz Roldan Cuenya
- Department of Physics, Ruhr-University Bochum, Universitätsstr. 150, D-44780, Germany
| | - Wolfgang Schuhmann
- Analytical Chemistry and Center for Electrochemical Sciences (CES), Ruhr-University Bochum, Universitätsstr. 150, D-44780, Germany
| | - Martin Muhler
- Laboratory of Industrial Chemistry, Ruhr-University Bochum, Universitätsstr. 150, D-44780, Germany
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50
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Li J, Güttinger R, Moré R, Song F, Wan W, Patzke GR. Frontiers of water oxidation: the quest for true catalysts. Chem Soc Rev 2017; 46:6124-6147. [DOI: 10.1039/c7cs00306d] [Citation(s) in RCA: 178] [Impact Index Per Article: 25.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Development of advanced analytical techniques is essential for the identification of water oxidation catalysts together with mechanistic studies.
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Affiliation(s)
- J. Li
- University of Zurich
- Department of Chemistry
- CH-8057 Zurich
- Switzerland
| | - R. Güttinger
- University of Zurich
- Department of Chemistry
- CH-8057 Zurich
- Switzerland
| | - R. Moré
- University of Zurich
- Department of Chemistry
- CH-8057 Zurich
- Switzerland
| | - F. Song
- University of Zurich
- Department of Chemistry
- CH-8057 Zurich
- Switzerland
| | - W. Wan
- University of Zurich
- Department of Chemistry
- CH-8057 Zurich
- Switzerland
| | - G. R. Patzke
- University of Zurich
- Department of Chemistry
- CH-8057 Zurich
- Switzerland
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