P-type cobaltite oxide spinels enable efficient electrocatalytic oxygen evolution reaction

Doppelbauer, David; Aljabour, Abdalaziz; Coskun, Halime; Sun, He; Gusenbauer, Markus; Lumetzberger, Julia; Primetzhofer, Daniel; Faina, B.; Duchoslav, Jiri; Kehrer, Matthias; Stifter, David; Groiß, Heiko; Ney, V.; Ney, Andreas; Stadler, Philipp

doi:10.1039/d1ma00157d

Cited by 2 publications

(1 citation statement)

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“…Latest efforts aimed in further incrementing the activity of spinel-based OER electrocatalysts. [779][780][781][782][783][784][785] A nano-scaled oxide hybrid material comprising CoFe 2 O 4 spinel modified by CeO 2 (CeO 2 @CoFe 2 O 4 ) displayed outstanding OER activity in 1 M KOH: a very low overpotential (Z = 213 mV) was enough to reach j = 100 mA cm À2 . 780 A strategy to increase the number of octahedral OER active sites on the surface of spinel oxides was recently shown by Yue et al: 784 a solid solution comprising MoFe 2 O 4 and CoFe 2 O 4 nanosheets supported on iron foam was synthesised through a hydrothermal route + annealing step (Fig.…”

Section: Perovskite-based Electrode Materials For Oxygen and Hydrogen...mentioning

confidence: 99%

Water electrolysis: from textbook knowledge to the latest scientific strategies and industrial developments

et al. 2022

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Section: Perovskite-based Electrode Materials For Oxygen and Hydrogen...mentioning

confidence: 99%

Water electrolysis: from textbook knowledge to the latest scientific strategies and industrial developments

et al. 2022

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Valence state, lattice incorporation, and resulting magnetic properties of Ni in Zn/Co-based magnetic oxides

Ney

Henne

Souza

et al. 2023

Journal of Applied Physics

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Ni incorporation has been studied in a comprehensive range of Zn/Co-based magnetic oxides to elucidate its valence state and lattice incorporation. The resulting structural and magnetic properties of a range of related types of samples are studied in detail. On the one hand, Ni doping is studied in wurtzite ZnO which is either done by in-diffusion of the Ni into bulk ZnO or by reactive magnetron sputtering for Ni-doped thin films of ZnO. The latter is complemented by Ni and Co codoping of ZnO leading to altered magnetic properties which are then dominated by Co. On the other hand, the [Formula: see text] spinel is codoped with varying amounts of Ni. In the wurtzite oxides, Ni is exclusively found on tetrahedral lattice sites in its formal 2+ oxidation state as deep donor. It behaves as an anisotropic paramagnet, and a limited solubility of Ni below 10% is found. Furthermore, the partial compensation of the antiferromagnetically coupled Co magnetic moments is induced by the Ni due to its smaller magnetic moment. In the [Formula: see text] spinel, Ni is found to be incorporated in its formal 3+ oxidation state on octahedral sites and also couples antiferromagnetically to the Co moments. At low Ni concentrations, this leads to a lifting of the partial magnetic compensation of the antiferromagnetic [Formula: see text] spinel and to ferrimagnetism at higher Ni concentrations. Increasing the Ni concentration even further leads to phase separation of cubic NiO resulting in a structurally less defined, exchange-biased composite magnetic oxide.

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P-type cobaltite oxide spinels enable efficient electrocatalytic oxygen evolution reaction

Abstract: Energy-efficient electrocatalytic oxygen evolution from water requires today the usage of noble metal oxides. Here we show that highly p-conducting zinc cobaltite spinel Zn1.2Co1.8O3.5 offers an enhanced electrocatalytic activity for...

Cited by 2 publications

References 40 publications

Water electrolysis: from textbook knowledge to the latest scientific strategies and industrial developments

Water electrolysis: from textbook knowledge to the latest scientific strategies and industrial developments

Valence state, lattice incorporation, and resulting magnetic properties of Ni in Zn/Co-based magnetic oxides

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