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 (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.
| Author: | Tsvetan TarnevORCiDGND, Harshitha Barike AiyappaORCiDGND, Alexander BotzORCiDGND, Thomas ErichsenORCiDGND, Andrzej ErnstORCiDGND, Corina AndronescuORCiDGND, Wolfgang SchuhmannORCiDGND |
|---|---|
| URN: | urn:nbn:de:hbz:294-71527 |
| DOI: | https://doi.org/10.1002/anie.201908021 |
| Parent Title (English): | Angewandte Chemie |
| Publisher: | Wiley-VCH Verlag |
| Place of publication: | Weinheim |
| Document Type: | Article |
| Language: | English |
| Date of Publication (online): | 2020/05/13 |
| Date of first Publication: | 2019/07/26 |
| Publishing Institution: | Ruhr-Universität Bochum, Universitätsbibliothek |
| Tag: | electrocatalysis; metal–organic frameworks; nanoparticles; oxygen evolution reaction; scanning electrochemical cell microscopy |
| Volume: | 58 |
| Issue: | 40 |
| First Page: | 14265 |
| Last Page: | 14269 |
| Note: | Dieser Beitrag ist auf Grund des DEAL-Wiley-Vertrages frei zugänglich. |
| Dewey Decimal Classification: | Naturwissenschaften und Mathematik / Chemie, Kristallographie, Mineralogie |
| open_access (DINI-Set): | open_access |
| Licence (English): |  Creative Commons - CC BY 4.0 - Attribution 4.0 International |
