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001     1005453
005     20231027114358.0
024 7 _ |a 10.1021/acsnano.2c08096
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024 7 _ |a 1936-0851
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024 7 _ |a 2128/34207
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100 1 _ |a Kante, Mohana V.
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245 _ _ |a A High-Entropy Oxide as High-Activity Electrocatalyst for Water Oxidation
260 _ _ |a Washington, DC
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520 _ _ |a 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.
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700 1 _ |a Weber, Moritz L.
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700 1 _ |a Ni, Shu
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700 1 _ |a van den Bosch, Iris C. G.
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700 1 _ |a van der Minne, Emma
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700 1 _ |a Heymann, Lisa
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700 1 _ |a Falling, Lorenz J.
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700 1 _ |a Gauquelin, Nicolas
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700 1 _ |a Tsvetanova, Martina
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700 1 _ |a Cunha, Daniel M.
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700 1 _ |a Koster, Gertjan
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700 1 _ |a Gunkel, Felix
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700 1 _ |a Nemšák, Slavomír
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700 1 _ |a Hahn, Horst
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700 1 _ |a Velasco Estrada, Leonardo
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700 1 _ |a Baeumer, Christoph
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773 _ _ |a 10.1021/acsnano.2c08096
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856 4 _ |u https://juser.fz-juelich.de/record/1005453/files/acsnano.2c08096.pdf
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