Trimetallic Mn‐Fe‐Ni oxide nanoparticles supported on multi‐walled carbon nanotubes as high‐performance bifunctional ORR/OER electrocatalyst in alkaline media
- Discovering precious metal‐free electrocatalysts exhibiting high activity and stability toward both the oxygen reduction (ORR) and the oxygen evolution (OER) reactions remains one of the main challenges for the development of reversible oxygen electrodes in rechargeable metal–air batteries and reversible electrolyzer/fuel cell systems. Herein, a highly active OER catalyst, Fe\(_{0.3}\)Ni\(_{0.7}\)O\(_X\) supported on oxygen‐functionalized multi‐walled carbon nanotubes, is substantially activated into a bifunctional ORR/OER catalyst by means of additional incorporation of MnO\(_X\). The carbon nanotube‐supported trimetallic (Mn‐Ni‐Fe) oxide catalyst achieves remarkably low ORR and OER overpotentials with a low reversible ORR/OER overvoltage of only 0.73 V, as well as selective reduction of O\(_{2}\) predominantly to OH\(^{−}\). It is shown by means of rotating disk electrode and rotating ring disk electrode voltammetry that the combination of earth‐abundant transition metal oxides leads to strong synergistic interactions modulating catalytic activity. The applicability of the prepared catalyst for reversible ORR/OER electrocatalysis is evaluated by means of a four‐electrode configuration cell assembly comprising an integrated two‐layer bifunctional ORR/OER electrode system with the individual layers dedicated for the ORR and the OER to prevent deactivation of the ORR activity as commonly observed in single‐layer bifunctional ORR/OER electrodes after OER polarization.
Author: | Dulce M. MoralesORCiDGND, Mariya A. KazakovaORCiDGND, Stefan DieckhöferORCiDGND, Alexander G. SelyutinGND, Georgiy V. GolubtsovGND, Wolfgang SchuhmannORCiDGND, Justus MasaORCiDGND |
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URN: | urn:nbn:de:hbz:294-75746 |
DOI: | https://doi.org/10.1002/adfm.201905992 |
Parent Title (English): | Advanced functional materials |
Publisher: | Wiley-VCH Verlag |
Place of publication: | Weinheim |
Document Type: | Article |
Language: | English |
Date of Publication (online): | 2020/10/09 |
Date of first Publication: | 2019/11/14 |
Publishing Institution: | Ruhr-Universität Bochum, Universitätsbibliothek |
Tag: | bifunctional electrocatalysts; oxidized multi‐walled carbon nanotubes; oxygen evolution reaction; oxygen reduction reaction; synergistic effects |
Volume: | 30 |
Issue: | 6 |
First Page: | 1905992-1 |
Last Page: | 1905992-12 |
Note: | Dieser Beitrag ist auf Grund des DEAL-Wiley-Vertrages frei zugänglich. |
Institutes/Facilities: | Lehrstuhl für Analytische Chemie und Zentrum für Elektrochemie |
Dewey Decimal Classification: | Naturwissenschaften und Mathematik / Chemie, Kristallographie, Mineralogie |
open_access (DINI-Set): | open_access |
faculties: | Fakultät für Chemie und Biochemie |
Licence (English): | Creative Commons - CC BY 4.0 - Attribution 4.0 International |