珠光线状CoS2-CuxS界面的动态重建及其增强析氧反应

IF 6.4 1区化学 Q1 CHEMISTRY, INORGANIC & NUCLEAR

Inorganic Chemistry Frontiers Pub Date : 2025-10-13 DOI:10.1039/d5qi01685a

Heyang Liu, Fengli Wei, Linlin Huang, Chengong Niu, Zuyang Luo, Tayirjan Taylor Isimjan, Xiulin Yang

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引用次数: 0

摘要

动态表面重构通过优化关键中间体的吸附，为提高析氧反应（OER）活性提供了一条有希望的途径。在此，我们在泡沫铜（co_2 - cuxs /CF）上构建了一个珍珠线状的CoS2-CuxS异质结构，在低电位下诱导CoOOH-CuO-CuxS活性界面的原位形成。原位拉曼光谱证实了动态转变，而operando电化学阻抗谱显示了加速的电荷转移。密度泛函理论计算表明，界面工程使d带中心发生位移，提高了费米能级附近的电子密度，降低了*O到*OOH转换的自由能垒，从1.78 eV （CoOOH）降低到1.48 eV （CoOOH- cuo - cuxs）。得益于重构的界面，CoS2-CuxS/CF在10 mA cm-2下的过电位达到239 mV，并在碱性电解质中保持200小时以上的稳定性。这项工作强调了一种动态界面策略，以促进内在OER动力学和催化剂耐久性。

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Dynamic Reconstruction of Pearl-Thread-Like CoS2-CuxS Interface for Enhanced Oxygen Evolution Reaction

Dynamic surface reconstruction offers a promising route to enhance oxygen evolution reaction (OER) activity by optimizing the adsorption of key intermediates. Here, we construct a pearl-thread-like CoS2-CuxS heterostructure on copper foam (CoS2-CuxS/CF) to induce in situ formation of an active CoOOH-CuO-CuxS interface at low potentials. In situ Raman spectroscopy confirms the dynamic transformation, while operando electrochemical impedance spectroscopy reveals accelerated charge transfer. Density functional theory calculations show that the interface engineering shifts the d-band center, enhances electron density near the Fermi level, and lowers the free energy barrier for *O to *OOH conversion from 1.78 eV (CoOOH) to 1.48 eV (CoOOH-CuO-CuxS). Benefiting from the reconstructed interface, CoS2-CuxS/CF achieves an overpotential of 239 mV at 10 mA cm-2 and maintains stability over 200 hours in alkaline electrolyte. This work highlights a dynamic interface strategy to promote intrinsic OER kinetics and catalyst durability.

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