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Scanning Electrochemical Cell Microscopy Investigation of Single ZIF‐Derived Nanocomposite Particles as Electrocatalysts for Oxygen Evolution in Alkaline Media
“Single entity” measurements are central for an improved understanding of the function of nanoparticle‐based electrocatalysts without interference arising from mass transfer limitations and local changes of educt concentration or the pH value. We report a scanning electrochemical cell microscopy (SE...
Autores principales: | , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
John Wiley and Sons Inc.
2019
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6790716/ https://www.ncbi.nlm.nih.gov/pubmed/31347751 http://dx.doi.org/10.1002/anie.201908021 |
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author | Tarnev, Tsvetan Aiyappa, Harshitha Barike Botz, Alexander Erichsen, Thomas Ernst, Andrzej Andronescu, Corina Schuhmann, Wolfgang |
author_facet | Tarnev, Tsvetan Aiyappa, Harshitha Barike Botz, Alexander Erichsen, Thomas Ernst, Andrzej Andronescu, Corina Schuhmann, Wolfgang |
author_sort | Tarnev, Tsvetan |
collection | PubMed |
description | “Single entity” measurements are central for an improved understanding of the function of nanoparticle‐based electrocatalysts without interference arising from mass transfer limitations and local changes of educt concentration or the pH value. We report a scanning electrochemical cell microscopy (SECCM) investigation of zeolitic imidazolate framework (ZIF‐67)‐derived Co−N‐doped C composite particles with respect to the oxygen evolution reaction (OER). Surmounting the surface wetting issues as well as the potential drift through the use of a non‐interfering Os complex as free‐diffusing internal redox potential standard, SECCM could be successfully applied in alkaline media. SECCM mapping reveals activity differences relative to the number of particles in the wetted area of the droplet landing zone. The turnover frequency (TOF) is 0.25 to 1.5 s(−1) at potentials between 1.7 and 1.8 V vs. RHE, respectively, based on the number of Co atoms in each particle. Consistent values at locations with varying number of particles demonstrates OER performance devoid of macroscopic film effects. |
format | Online Article Text |
id | pubmed-6790716 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
publisher | John Wiley and Sons Inc. |
record_format | MEDLINE/PubMed |
spelling | pubmed-67907162019-10-21 Scanning Electrochemical Cell Microscopy Investigation of Single ZIF‐Derived Nanocomposite Particles as Electrocatalysts for Oxygen Evolution in Alkaline Media Tarnev, Tsvetan Aiyappa, Harshitha Barike Botz, Alexander Erichsen, Thomas Ernst, Andrzej Andronescu, Corina Schuhmann, Wolfgang Angew Chem Int Ed Engl Communications “Single entity” measurements are central for an improved understanding of the function of nanoparticle‐based electrocatalysts without interference arising from mass transfer limitations and local changes of educt concentration or the pH value. We report a scanning electrochemical cell microscopy (SECCM) investigation of zeolitic imidazolate framework (ZIF‐67)‐derived Co−N‐doped C composite particles with respect to the oxygen evolution reaction (OER). Surmounting the surface wetting issues as well as the potential drift through the use of a non‐interfering Os complex as free‐diffusing internal redox potential standard, SECCM could be successfully applied in alkaline media. SECCM mapping reveals activity differences relative to the number of particles in the wetted area of the droplet landing zone. The turnover frequency (TOF) is 0.25 to 1.5 s(−1) at potentials between 1.7 and 1.8 V vs. RHE, respectively, based on the number of Co atoms in each particle. Consistent values at locations with varying number of particles demonstrates OER performance devoid of macroscopic film effects. John Wiley and Sons Inc. 2019-08-21 2019-10-01 /pmc/articles/PMC6790716/ /pubmed/31347751 http://dx.doi.org/10.1002/anie.201908021 Text en © 2019 The Authors. Published by Wiley-VCH Verlag GmbH & Co. KGaA. This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
spellingShingle | Communications Tarnev, Tsvetan Aiyappa, Harshitha Barike Botz, Alexander Erichsen, Thomas Ernst, Andrzej Andronescu, Corina Schuhmann, Wolfgang Scanning Electrochemical Cell Microscopy Investigation of Single ZIF‐Derived Nanocomposite Particles as Electrocatalysts for Oxygen Evolution in Alkaline Media |
title | Scanning Electrochemical Cell Microscopy Investigation of Single ZIF‐Derived Nanocomposite Particles as Electrocatalysts for Oxygen Evolution in Alkaline Media |
title_full | Scanning Electrochemical Cell Microscopy Investigation of Single ZIF‐Derived Nanocomposite Particles as Electrocatalysts for Oxygen Evolution in Alkaline Media |
title_fullStr | Scanning Electrochemical Cell Microscopy Investigation of Single ZIF‐Derived Nanocomposite Particles as Electrocatalysts for Oxygen Evolution in Alkaline Media |
title_full_unstemmed | Scanning Electrochemical Cell Microscopy Investigation of Single ZIF‐Derived Nanocomposite Particles as Electrocatalysts for Oxygen Evolution in Alkaline Media |
title_short | Scanning Electrochemical Cell Microscopy Investigation of Single ZIF‐Derived Nanocomposite Particles as Electrocatalysts for Oxygen Evolution in Alkaline Media |
title_sort | scanning electrochemical cell microscopy investigation of single zif‐derived nanocomposite particles as electrocatalysts for oxygen evolution in alkaline media |
topic | Communications |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6790716/ https://www.ncbi.nlm.nih.gov/pubmed/31347751 http://dx.doi.org/10.1002/anie.201908021 |
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