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Anion-Source Plasma Engineering of Surface Reconstruction in LaCoO3 for Oxygen Evolution
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DOI：10.1021/acscatal.6c03169.png)
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Abstract
En 中文
By effectively decoupling surface properties from those of the bulk parent oxide through controlled surface modification, favorable surface characteristics can be induced that promote enhanced oxygen evolution reaction (OER) activity. Here, we demonstrate that CF4 plasma treatment preconditions lanthanum cobaltite (LaCoO3, LCO) by simultaneously incorporating fluorine, generating oxygen vacancies, and forming an amorphous surface layer while preserving the crystalline perovskite core. Structural and spectroscopic analyses reveal that plasma treatment lowers the Co oxidation state, decreases Co−O coordination, and produces a fluorinated disordered surface that is highly susceptible to surface reconstruction. Upon exposure to KOH and subsequent OER cycling, this preconditioned surface rapidly evolves through a Co(OH)2 intermediate phase into amorphous CoOxHy, as evidenced by Raman spectroscopy, soft X-ray absorption spectroscopy, and high-resolution transmission electron microscopy. Consistently, the degree of reconstruction increases systematically with plasma treatment duration and directly correlates with enhanced OER activity. As a result, LCO treated for 60 min exhibits a 6.4-fold higher current density than pristine LCO at 1.60 VRHE. These findings establish CF4 plasma treatment as a controllable and scalable strategy for programming surface reconstruction and enhancing OER electrocatalytic performance.
Keywords:
electrocatalysis
oxygen evolution reaction
surface engineering
anion-source plasma treatment
surface reconstruction
Journal
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13.1
Papers:
1.6W
Citations:
15.0W
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