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  1. Article ; Online: In situ

    Amirbeigiarab, Reihaneh / Magnussen, Olaf M

    Physical chemistry chemical physics : PCCP

    2023  Volume 25, Issue 36, Page(s) 24871–24877

    Abstract: Ag-decorated Cu electrocatalysts are of great interest for electrochemical ... ...

    Abstract Ag-decorated Cu electrocatalysts are of great interest for electrochemical CO
    Language English
    Publishing date 2023-09-20
    Publishing country England
    Document type Journal Article
    ZDB-ID 1476244-4
    ISSN 1463-9084 ; 1463-9076
    ISSN (online) 1463-9084
    ISSN 1463-9076
    DOI 10.1039/d3cp02766j
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Measurement of Surface Diffusion at the Electrochemical Interface by In Situ Linear Optical Diffraction.

    Kattwinkel, Lasse / Magnussen, Olaf M

    ACS measurement science au

    2023  Volume 3, Issue 2, Page(s) 98–102

    Abstract: A new in situ method for measuring the surface diffusion rates of adsorbates on electrode surfaces in electrolyte solution is presented. The method is based on the generation of a periodic spatial modulation of the adsorbate coverage via interfering ... ...

    Abstract A new in situ method for measuring the surface diffusion rates of adsorbates on electrode surfaces in electrolyte solution is presented. The method is based on the generation of a periodic spatial modulation of the adsorbate coverage via interfering laser pulses and subsequent monitoring of the diffusion-induced decay of this pattern using the optical diffraction signal of a second laser. Proof-of-principle measurements of the surface diffusion of adsorbed sulfur on Pt(111) electrodes in 0.1 M H
    Language English
    Publishing date 2023-01-26
    Publishing country United States
    Document type Journal Article
    ISSN 2694-250X
    ISSN (online) 2694-250X
    DOI 10.1021/acsmeasuresciau.2c00066
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Influence of coverage on adsorbate diffusion measurements at electrode surfaces by in situ linear optical diffraction.

    Kattwinkel, Lasse / Magnussen, Olaf M

    The Journal of chemical physics

    2023  Volume 158, Issue 16

    Abstract: In situ linear optical diffraction is a new method for studies of surface mass transport in electrochemical environments that is based on the equilibration of coverage gratings in an adlayer on the electrode surface. We, here, discuss the temporal ... ...

    Abstract In situ linear optical diffraction is a new method for studies of surface mass transport in electrochemical environments that is based on the equilibration of coverage gratings in an adlayer on the electrode surface. We, here, discuss the temporal evolution of the diffraction intensity on the basis of experimental data for sulfur adsorbates on Pt(111) electrodes in 0.1M H2SO4 and simulations of the time-dependent diffusion profiles. At low and medium sulfur coverage, the decay of the signal exhibits two time scales, which can be explained by the influence of coverage-dependent diffusion rates on the evolution of gratings with large coverage modulation. At high coverage, a further ultra-slow decay process or even a complete termination of the decay is observed, which we attribute to the presence of high-density, ordered, adlayer phases with low sulfur mobility. These results provide insight into the approaches required for extracting quantitative surface transport rates from linear optical diffraction measurements.
    Language English
    Publishing date 2023-04-24
    Publishing country United States
    Document type Journal Article
    ZDB-ID 3113-6
    ISSN 1089-7690 ; 0021-9606
    ISSN (online) 1089-7690
    ISSN 0021-9606
    DOI 10.1063/5.0143049
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Moving through the crowd.

    Magnussen, Olaf M

    Science (New York, N.Y.)

    2019  Volume 363, Issue 6428, Page(s) 695–696

    Language English
    Publishing date 2019-02-14
    Publishing country United States
    Document type Journal Article
    ZDB-ID 128410-1
    ISSN 1095-9203 ; 0036-8075
    ISSN (online) 1095-9203
    ISSN 0036-8075
    DOI 10.1126/science.aaw4900
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    In stock of ZB MED Cologne/Königswinter

    Zs.A 27: Show issues Location:
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    bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular
    Jg. 1995 - 2021: Lesesall (1.OG)
    ab Jg. 2022: Lesesaal (EG)
    Zs.MG 77: Show issues

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  5. Article ; Online: Atomic-Scale Insights into Electrode Surface Dynamics by High-Speed Scanning Probe Microscopy.

    Magnussen, Olaf M

    Chemistry (Weinheim an der Bergstrasse, Germany)

    2019  Volume 25, Issue 56, Page(s) 12865–12883

    Abstract: Atomic-scale processes at electrode surfaces in liquid electrolytes are central elemental steps of electrochemical reactions. Detailed insights into the structure of these interfaces can be obtained with in situ scanning tunnelling and atomic force ... ...

    Abstract Atomic-scale processes at electrode surfaces in liquid electrolytes are central elemental steps of electrochemical reactions. Detailed insights into the structure of these interfaces can be obtained with in situ scanning tunnelling and atomic force microscopy. By increasing the time resolution of these methods into the millisecond range, highly dynamic processes at electrode surfaces become directly observable. This review gives an overview of in situ studies with video-rate scanning probe microscopy techniques. Firstly, quantitative investigations into the dynamic behaviour of individual adsorbed atoms and molecules are described. These reveal a complex dependence of adsorbate surface diffusion on potential and co-adsorbed species and provide data on adsorbate-adsorbate and adsorbate-substrate interactions in a liquid environment. Secondly, results on collective dynamic phenomena are discussed, such as molecular self-assembly, the dynamics of nanoscale structures, nucleation and growth, and surface restructuring due to phase-formation processes.
    Language English
    Publishing date 2019-08-02
    Publishing country Germany
    Document type Journal Article ; Review
    ZDB-ID 1478547-X
    ISSN 1521-3765 ; 0947-6539
    ISSN (online) 1521-3765
    ISSN 0947-6539
    DOI 10.1002/chem.201901709
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  6. Article: Electrochemical In Situ Video-STM Studies of the Phase Transition of CO Adlayers on Pt(111) Electrodes

    Wei, Jie / Chen, Yan-Xia / Magnussen, Olaf M

    Journal of physical chemistry. 2021 Jan. 28, v. 125, no. 5

    2021  

    Abstract: The potential-dependent (2 × 2)-3CO → (√19 × √19)R23.4°-13CO phase transition of CO adlayers on Pt(111) in a 0.1 M H₂SO₄ electrolyte containing minor amounts of CO was studied on the subsecond time scale by in situ high-speed scanning tunneling ... ...

    Abstract The potential-dependent (2 × 2)-3CO → (√19 × √19)R23.4°-13CO phase transition of CO adlayers on Pt(111) in a 0.1 M H₂SO₄ electrolyte containing minor amounts of CO was studied on the subsecond time scale by in situ high-speed scanning tunneling microscopy. At a potential of 0.20 V versus Ag/AgCl, the (2 × 2)-3CO phase is converted into an apparent (1 × 1)-CO adlayer. Upon increasing the potential to 0.25 V, this adlayer first transiently exhibits both a local (1 × 1) lattice as well as a (√19 × √19)R23.4° superlattice before it is gradually transformed into a static (√19 × √19)R23.4°-13CO adlayer with a rotated and expanded adsorbate arrangement. In the transient structure, highly dynamic fluctuations in the adsorbate positions are observed. These results can be rationalized by a microscopic mechanism in which the removal of CO adsorbates leads to highly mobile defects with a local (1 × 1) structure in the (2 × 2)-3CO adlayer. With decreasing CO coverage, a densely packed arrangement of these (1 × 1) clusters with (√19 × √19)R23.4° symmetry is formed, which subsequently rearranges gradually into the (√19 × √19)R23.4°-13CO adlayer.
    Keywords electrochemistry ; electrolytes ; phase transition
    Language English
    Dates of publication 2021-0128
    Size p. 3066-3072.
    Publishing place American Chemical Society
    Document type Article
    Note NAL-AP-2-clean
    ISSN 1932-7455
    DOI 10.1021/acs.jpcc.0c10890
    Database NAL-Catalogue (AGRICOLA)

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  7. Article ; Online: Toward an Atomic-Scale Understanding of Electrochemical Interface Structure and Dynamics.

    Magnussen, Olaf M / Groß, Axel

    Journal of the American Chemical Society

    2019  Volume 141, Issue 12, Page(s) 4777–4790

    Abstract: For the knowledged-based development of electrochemical processes, a better fundamental understanding of the interfaces between electrodes and electrolytes is necessary. This requires insight into the interface structure and dynamics on the atomic-scale, ...

    Abstract For the knowledged-based development of electrochemical processes, a better fundamental understanding of the interfaces between electrodes and electrolytes is necessary. This requires insight into the interface structure and dynamics on the atomic-scale, including that of the liquid electrolyte in the near-surface region, i.e., in the inner and outer part of the electrochemical double layer. This perspective describes current studies of simple and well-defined electrochemical interfaces by first-principles electronic structure calculations and in situ structure-sensitive methods. It is shown that these experimental and theoretical studies are now approaching a level, where they can operate on the same footing, making direct comparison of the obtained results feasible. Using selected examples, progress in clarifying the structure and dynamics of the double layer, of adsorbed species on electrode surfaces, and of initial steps in electrochemical phase formation processes is discussed.
    Language English
    Publishing date 2019-02-27
    Publishing country United States
    Document type Journal Article
    ZDB-ID 3155-0
    ISSN 1520-5126 ; 0002-7863
    ISSN (online) 1520-5126
    ISSN 0002-7863
    DOI 10.1021/jacs.8b13188
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  8. Article ; Online: In Situ

    Magnussen, Olaf M / Drnec, Jakub / Qiu, Canrong / Martens, Isaac / Huang, Jason J / Chattot, Raphaël / Singer, Andrej

    Chemical reviews

    2024  Volume 124, Issue 3, Page(s) 629–721

    Abstract: Electrochemical and electrocatalytic processes are of key importance for the transition to a sustainable energy supply as well as for a wide variety of other technologically relevant fields. Further development of these processes requires in-depth ... ...

    Abstract Electrochemical and electrocatalytic processes are of key importance for the transition to a sustainable energy supply as well as for a wide variety of other technologically relevant fields. Further development of these processes requires in-depth understanding of the atomic, nano, and micro scale structure of the materials and interfaces in electrochemical devices under reaction conditions. We here provide a comprehensive review of
    Language English
    Publishing date 2024-01-22
    Publishing country United States
    Document type Journal Article ; Review
    ZDB-ID 207949-5
    ISSN 1520-6890 ; 0009-2665
    ISSN (online) 1520-6890
    ISSN 0009-2665
    DOI 10.1021/acs.chemrev.3c00331
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  9. Article ; Online: Interface Phenomena.

    Engstfeld, Albert K / Hoster, Harry / Magnussen, Olaf M

    Chemphyschem : a European journal of chemical physics and physical chemistry

    2021  Volume 22, Issue 24, Page(s) 2497

    Abstract: This special collection on Interface Phenomena is dedicated to R. Jürgen Behm on the occasion of his retirement and 70th birthday. Jürgen Behm's research over the past 40 years has addressed a wide variety of interface processes in the fields of growth, ... ...

    Abstract This special collection on Interface Phenomena is dedicated to R. Jürgen Behm on the occasion of his retirement and 70th birthday. Jürgen Behm's research over the past 40 years has addressed a wide variety of interface processes in the fields of growth, corrosion, heterogeneous catalysis, electrocatalysis, and batteries.
    Language English
    Publishing date 2021-11-08
    Publishing country Germany
    Document type Editorial
    ZDB-ID 2025223-7
    ISSN 1439-7641 ; 1439-4235
    ISSN (online) 1439-7641
    ISSN 1439-4235
    DOI 10.1002/cphc.202100712
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  10. Article: Toward an Atomic-Scale Understanding of Electrochemical Interface Structure and Dynamics

    Magnussen, Olaf M / Axel Groß

    Journal of the American Chemical Society. 2019 Feb. 15, v. 141, no. 12

    2019  

    Abstract: For the knowledged-based development of electrochemical processes, a better fundamental understanding of the interfaces between electrodes and electrolytes is necessary. This requires insight into the interface structure and dynamics on the atomic-scale, ...

    Abstract For the knowledged-based development of electrochemical processes, a better fundamental understanding of the interfaces between electrodes and electrolytes is necessary. This requires insight into the interface structure and dynamics on the atomic-scale, including that of the liquid electrolyte in the near-surface region, i.e., in the inner and outer part of the electrochemical double layer. This perspective describes current studies of simple and well-defined electrochemical interfaces by first-principles electronic structure calculations and in situ structure-sensitive methods. It is shown that these experimental and theoretical studies are now approaching a level, where they can operate on the same footing, making direct comparison of the obtained results feasible. Using selected examples, progress in clarifying the structure and dynamics of the double layer, of adsorbed species on electrode surfaces, and of initial steps in electrochemical phase formation processes is discussed.
    Keywords electrochemistry ; electrodes ; electrolytes
    Language English
    Dates of publication 2019-0215
    Size p. 4777-4790.
    Publishing place American Chemical Society
    Document type Article
    ZDB-ID 3155-0
    ISSN 1520-5126 ; 0002-7863
    ISSN (online) 1520-5126
    ISSN 0002-7863
    DOI 10.1021/jacs.8b13188
    Database NAL-Catalogue (AGRICOLA)

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