Linking composition, structure and thickness of CoOOH layers to oxygen evolution reaction activity by correlative microscopy
- The role of \(\beta\)-CoOOH crystallographic orientations in catalytic activity for the oxygen evolution reaction (OER) remains elusive. We combine correlative electron backscatter diffraction/scanning electrochemical cell microscopy with X-ray photoelectron spectroscopy, transmission electron microscopy, and atom probe tomography to establish the structure–activity relationships of various faceted \(\beta\)-CoOOH formed on a Co microelectrode under OER conditions. We reveal that \(\approx\)6 nm \(\beta\)-CoOOH(01\(\overline{1}\)0, grown on [\(\overline{1}\)2\(\overline{1}\)0]-oriented Co, exhibits higher OER activity than \(\approx\)3 nm \(\beta\)-CoOOH(10\(\overline{1}\)3) or \(\approx\)6 nm \(\beta\)-CoOOH(0006) formed on [02\(\overline{2}\)1]- and [0001]-oriented Co, respectively. This arises from higher amounts of incorporated hydroxyl ions and more easily reducible Co\(^{III}\)−O sites present in \(\beta\)-CoOOH(01\(\overline{1}\)0) than those in the latter two oxyhydroxide facets. Our correlative multimodal approach shows great promise in linking local activity with atomic-scale details of structure, thickness and composition of active species, which opens opportunities to design pre-catalysts with preferred defects that promote the formation of the most active OER species.
Author: | Chenglong LuanGND, Johanna AngonaGND, Arjun Bala KrishnanGND, Manuel CorvaORCiDGND, Seyed Pouya Hosseini YazdeliGND, Markus HeidelmannORCiDGND, Ulrich Johannes HagemannORCiDGND, Emmanuel Batsa TettahGND, Wolfgang SchuhmannORCiDGND, Kristina TschulikORCiDGND, Tong LiORCiDGND |
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URN: | urn:nbn:de:hbz:294-100157 |
DOI: | https://doi.org/10.1002/anie.202305982 |
Parent Title (English): | Angewandte Chemie Internationale Edition |
Publisher: | Wiley-VCH |
Place of publication: | Hoboken, New Jersey |
Document Type: | Article |
Language: | English |
Date of Publication (online): | 2023/07/04 |
Date of first Publication: | 2023/05/13 |
Publishing Institution: | Ruhr-Universität Bochum, Universitätsbibliothek |
Tag: | Projekt MITICAT, Project ID 949724 Atom Probe Tomography; Cobalt Oxyhydroxide; Identical Location Microscopy; Scanning Electrochemical Cell Microscopy; Water Splitting |
Volume: | 62 |
Issue: | 28, Artikel e202305982 |
First Page: | e202305982-1 |
Last Page: | e202305982-12 |
Note: | Projekt MITICAT, Project ID 949724 |
Relation (DC): | info:eu-repo/grantAgreement/EC/H2020/949724 |
Institutes/Facilities: | Lehrstuhl für Analytische Chemie II, Elektrochemie und Nanoskalige Materialien |
Dewey Decimal Classification: | Naturwissenschaften und Mathematik / Chemie, Kristallographie, Mineralogie |
OpenAIRE: | OpenAIRE |
faculties: | Fakultät für Chemie und Biochemie |
Licence (English): | Creative Commons - CC BY-NC-ND 4.0 - Attribution-NonCommercial-NoDerivatives 4.0 International |