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Tytuł:
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Nanoscale Colocalized Electrochemical and Structural Mapping of Metal Dissolution Reaction.
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Autorzy:
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Wang Y; Department of Chemistry, The University of Texas at Austin, 105 East 24th Street, Austin, Texas 78712, United States.
Li M; Department of Chemistry, The University of Texas at Austin, 105 East 24th Street, Austin, Texas 78712, United States.
Gordon E; Department of Chemistry and Biochemistry, Miami University, Oxford, Ohio 45056, United States.
Ye Z; Department of Mechanical and Manufacturing Engineering, Miami University, Oxford, Ohio 45056, United States.
Ren H; Department of Chemistry, The University of Texas at Austin, 105 East 24th Street, Austin, Texas 78712, United States.
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Źródło:
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Analytical chemistry [Anal Chem] 2022 Jun 28; Vol. 94 (25), pp. 9058-9064. Date of Electronic Publication: 2022 Jun 14.
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Typ publikacji:
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Journal Article; Research Support, U.S. Gov't, Non-P.H.S.
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Język:
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English
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Imprint Name(s):
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Original Publication: Washington, American Chemical Society.
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MeSH Terms:
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Electric Power Supplies*
Electrochemistry ; Kinetics ; Microscopy, Electrochemical, Scanning ; Solubility
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Entry Date(s):
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Date Created: 20220614 Date Completed: 20220629 Latest Revision: 20220726
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Update Code:
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20240105
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DOI:
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10.1021/acs.analchem.2c01283
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PMID:
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35700400
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Understanding the structure-activity relationship in electrochemical metal dissolution reactions is fundamentally important, from designing higher density batteries to mitigating corrosions. The kinetics of metal dissolution reaction is highly dependent on surface structures, including grain boundaries and local defects. However, directly probing the electrochemical activity at these sites is difficult because the conventional bulk electrochemistry measures an averaged kinetics, obscuring the structure-activity correlation. Herein, we report the colocalized mapping of an electrochemical metal dissolution reaction using Ag as a model system. The local dissolution kinetics is voltammetrically mapped via scanning electrochemical cell microscopy (SECCM), which is correlated with local structures obtained via colocalized electron backscattering diffraction (EBSD). Individual pits of ∼200 nm are formed, and their geometries suggest dissolution is fastest in the direction parallel to the {111} planes. Enhanced dissolution kinetics is observed at the high-angle grain boundaries but not at twin boundaries, which are attributed to the different binding energy of Ag atoms. Furthermore, the faster local dissolution correlates with the geometrically necessary dislocation density. The work demonstrates the importance of nanoscale local electrochemical mapping and colocalized microscopic measurement in obtaining the structure-activity relationship for electrochemical reactions at complex interfaces.
