This title appears in the Scientific Report :
2023
Please use the identifier:
http://dx.doi.org/10.1021/acsnano.2c08096 in citations.
Please use the identifier: http://hdl.handle.net/2128/34207 in citations.
A High-Entropy Oxide as High-Activity Electrocatalyst for Water Oxidation
A High-Entropy Oxide as High-Activity Electrocatalyst for Water Oxidation
High-entropy materials are an emerging pathway in the development of high-activity (electro)catalysts because of the inherent tunability and coexistence of multiple potential active sites, which may lead to earth-abundant catalyst materials for energy-efficient electrochemical energy storage. In thi...
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Personal Name(s): | Kante, Mohana V. |
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Weber, Moritz L. / Ni, Shu / van den Bosch, Iris C. G. / van der Minne, Emma / Heymann, Lisa / Falling, Lorenz J. / Gauquelin, Nicolas / Tsvetanova, Martina / Cunha, Daniel M. / Koster, Gertjan / Gunkel, Felix / Nemšák, Slavomír / Hahn, Horst / Velasco Estrada, Leonardo / Baeumer, Christoph (Corresponding author) | |
Contributing Institute: |
Elektronische Materialien; PGI-7 JARA-FIT; JARA-FIT |
Published in: | ACS nano, 17 (2023) 6, S. 5329–5339 |
Imprint: |
Washington, DC
Soc.
2023
|
DOI: |
10.1021/acsnano.2c08096 |
Document Type: |
Journal Article |
Research Program: |
Memristive Materials and Devices |
Link: |
OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://hdl.handle.net/2128/34207 in citations.
High-entropy materials are an emerging pathway in the development of high-activity (electro)catalysts because of the inherent tunability and coexistence of multiple potential active sites, which may lead to earth-abundant catalyst materials for energy-efficient electrochemical energy storage. In this report, we identify how the multication composition in high-entropy perovskite oxides (HEO) contributes to high catalytic activity for the oxygen evolution reaction (OER), i.e., the key kinetically limiting half-reaction in several electrochemical energy conversion technologies, including green hydrogen generation. We compare the activity of the (001) facet of LaCr0.2Mn0.2Fe0.2Co0.2Ni0.2O3-δ with the parent compounds (single B-site in the ABO3 perovskite). While the single B-site perovskites roughly follow the expected volcano-type activity trends, the HEO clearly outperforms all of its parent compounds with 17 to 680 times higher currents at a fixed overpotential. As all samples were grown as an epitaxial layer, our results indicate an intrinsic composition–function relationship, avoiding the effects of complex geometries or unknown surface composition. In-depth X-ray photoemission studies reveal a synergistic effect of simultaneous oxidation and reduction of different transition metal cations during the adsorption of reaction intermediates. The surprisingly high OER activity demonstrates that HEOs are a highly attractive, earth-abundant material class for high-activity OER electrocatalysts, possibly allowing the activity to be fine-tuned beyond the scaling limits of mono- or bimetallic oxides. |