Enhanced oxygen evolution reaction<i>via</i>the tunability of spin polarization and electronic states in a flexible van der Waals membranous catalyst

Xu, Hang; Qi, Ji; Zhang, Yuan; Hu, Linglong; Feng, Ming; Lü, Weiming

doi:10.1039/d3cp02201c

Phys. Chem. Chem. Phys.

2023

DOI: 10.1039/d3cp02201c

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Enhanced oxygen evolution reactionviathe tunability of spin polarization and electronic states in a flexible van der Waals membranous catalyst

Hang Xu¹,

Ji Qi²,

Yuan Zhang³

et al.

Abstract: The response of magnetic field and strain engineering in an electrochemical process, such as the oxygen evolution reaction (OER), not only provides a strategy for enhancing catalytic performance through external...

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2024

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Enhanced oxygen evolution reaction by modulating the electronic states of a flexible van der Waals membranous catalyst with infinite-layer phase

Xu,

Meng,

Liu

et al. 2024

Ceramics International

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Enhanced oxygen evolution reaction by modulating the electronic states of a flexible van der Waals membranous catalyst with infinite-layer phase

Xu,

Meng,

Liu

et al. 2024

Ceramics International

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The effect of intrinsic magnetic order on electrochemical water splitting

van der Minne,

Korol,

Krakers

et al. 2024

Applied Physics Reviews

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To reach a long term viable green hydrogen economy, rational design of active oxygen evolution reaction (OER) catalysts is critical. An important hurdle in this reaction originates from the fact that the reactants are singlet molecules, whereas the oxygen molecule has a triplet ground state with parallel spin alignment, implying that magnetic order in the catalyst is essential. Accordingly, multiple experimentalists reported a positive effect of external magnetic fields on OER activity of ferromagnetic catalysts. However, it remains a challenge to investigate the influence of the intrinsic magnetic order on catalytic activity. Here, we tuned the intrinsic magnetic order of epitaxial La0.67Sr0.33MnO3 thin film model catalysts from ferro- to paramagnetic by changing the temperature in situ during water electrolysis. Using this strategy, we show that ferromagnetic ordering below the Curie temperature enhances OER activity. Moreover, we show a slight current density enhancement upon application of an external magnetic field and find that the dependence of magnetic field direction correlates with the magnetic anisotropy in the catalyst film. Our work, thus, suggests that both the intrinsic magnetic order in La0.67Sr0.33MnO3 films and magnetic domain alignment increase their catalytic activity. We observe no long-range magnetic order at the catalytic surface, implying that the OER enhancement is connected to the magnetic order of the bulk catalyst. Combining the effects found with existing literature, we propose a unifying picture for the spin-polarized enhancement in magnetic oxide catalysts.

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Enhanced oxygen evolution reactionviathe tunability of spin polarization and electronic states in a flexible van der Waals membranous catalyst

Abstract: The response of magnetic field and strain engineering in an electrochemical process, such as the oxygen evolution reaction (OER), not only provides a strategy for enhancing catalytic performance through external...

Cited by 2 publications

References 59 publications

Enhanced oxygen evolution reaction by modulating the electronic states of a flexible van der Waals membranous catalyst with infinite-layer phase

Enhanced oxygen evolution reaction by modulating the electronic states of a flexible van der Waals membranous catalyst with infinite-layer phase

The effect of intrinsic magnetic order on electrochemical water splitting

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