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  Electrochemical dealloying as a tool to tune the porosity, composition and catalytic activity of nanomaterials

Rurainsky, C., Garzón-Manjón, A., Hiege, F., Chen, Y.-T., Scheu, C., & Tschulik, K. (2020). Electrochemical dealloying as a tool to tune the porosity, composition and catalytic activity of nanomaterials. Journal of Materials Chemistry A, 8(37), 19405-19413. doi:10.1039/d0ta04880a.

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Electrochemical dealloying as a tool to tune the porosity, composition and catalytic activity of nanomaterials - d0ta04880a.pdf (Publisher version), 3MB
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Electrochemical dealloying as a tool to tune the porosity, composition and catalytic activity of nanomaterials - d0ta04880a.pdf
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Open Access
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Copyright Date:
2020
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The Royal Society of Chemistry

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 Creators:
Rurainsky, Christian1, Author              
Garzón-Manjón, Alba2, Author              
Hiege, Felix3, Author              
Chen, Yen-Ting4, Author              
Scheu, Christina2, Author              
Tschulik, Kristina1, Author              
Affiliations:
1Ruhr University Bochum, Faculty for Chemistry and Biochemistry, Analytical Chemistry II, Bochum, Germany, ou_persistent22              
2Nanoanalytics and Interfaces, Independent Max Planck Research Groups, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_2054294              
3Faculty of Chemistry and Biochemistry, Chair of Analytical Chemistry II, Ruhr University Bochum, Bochum, Germany, ou_persistent22              
4Center for Solvation Science (ZEMOS), Ruhr University Bochum, Bochum, Germany, ou_persistent22              

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Free keywords: Agglomeration; Binary alloys; Cyclic voltammetry; Dealloying; Gold alloys; Gold metallography; Hydrogen evolution reaction; Nanocatalysts; Nanoparticles; Porosity; Silver alloys; Silver metallography; Synthesis (chemical), Compositional changes; Electrocatalytic properties; Electron microscopy analysis; Number of cycles; Particle aggregation; Porosity formation; Suitable conditions; Trial and error, Catalyst activity
 Abstract: Electrochemical dealloying as a post-Treatment can greatly improve the catalytic activity of nanoparticles. To date, selecting suitable conditions to reach desired porosity, composition and catalytic activity is based on trial-And-error-Attempts, due to insufficient understanding of the electrochemically induced morphological and compositional changes of the nanoparticles. These changes are elucidated here by combining electrochemistry with identical location electron microscopy analyses and linking them to the electrocatalytic properties of the obtained nanocatalysts. Using AgAu alloy nanoparticles and the hydrogen evolution reaction as a model system, the influence of cyclic voltammetry parameters on the catalytic activity upon electrochemical dealloying is investigated. Increasing the number of cycles initially results in a decreased Ag content and a sharp improvement in activity. Additional dealloying increases the nanoparticle porosity, while marginally altering their composition, due to surface motion of atoms. Since this is accompanied by particle aggregation, a decrease in catalytic activity results upon extensive cycling. This transition between porosity formation and particle aggregation marks the optimum for nanocatalyst post-production. The gained insights may aid speeding up the development of new materials by electrochemical dealloying as an easy-To-control post-processing route to tune the properties of existing nanoparticles, instead of having to alter usually delicate synthesis routes as a whole. © The Royal Society of Chemistry.

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Language(s): eng - English
 Dates: 2020-08-182020
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1039/d0ta04880a
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Title: Journal of Materials Chemistry A
  Abbreviation : J. Mater. Chem. A
Source Genre: Journal
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Publ. Info: Cambridge, UK : Royal Society of Chemistry
Pages: - Volume / Issue: 8 (37) Sequence Number: - Start / End Page: 19405 - 19413 Identifier: ISSN: 2050-7488
CoNE: https://pure.mpg.de/cone/journals/resource/2050-7488