Křenek Tomáš, Vála Lukáš, Subramanian Palaniappan, Khan Saleem Ayaz, Minár Ján, Koštejn Martin, Medlín Rostislav, Mikysek Petr, Jandová Věra, Vavruňková Veronika
Faculty of Mechanical Engineering, Department of Material and Engineering Metallurgy, University of West Bohemia Univerzitní 8 301 00 Pilsen Czech Republic
New Technologies-Research Center, University of West Bohemia Univerzitní 8 306 14 Pilsen Czech Republic.
RSC Adv. 2025 Jul 23;15(32):26371-26382. doi: 10.1039/d5ra03059e. eCollection 2025 Jul 21.
Pulsed laser irradiation of an equimolar mixture of FeS and CoS onto a Ta substrate results in the one-step formation of bimetallic iron cobalt sulfide. The use of complementary analytical techniques, such as scanning electron microscopy, Raman spectroscopy, X-ray photoelectron spectroscopy, X-ray diffraction, high-resolution electron microscopy, and electron diffraction, confirmed the presence of nanocrystalline cobaltpentlandite [FeCoS] and maghemite [γ-FeO]. The mechanism by which this occurs involves the reactive interaction of laser-ionized Fe, Co, and S species, which subsequently undergo rapid non-equilibrium cooling and deposition. The higher deposition tendency of CoS along with iron ions/atoms leads to the formation of FeCoS. This proposed mechanism is supported by density functional theory (DFT), which provides a deeper understanding of the higher thermodynamic stability of Fe in Co Fe S compared with Co in Fe Co S. The FeCoS-based deposit exhibited enhanced catalytic efficiency for methylene blue daylight-driven and Fenton-like degradation. In contrast, for solar light-driven degradation of sulfamethoxazole and trimethoprim, the FeCoS-based deposit does not show enhanced catalytic activity compared to FeS and CoS. Additionally, electrochemical testing of the oxygen evolution reaction (OER) revealed significantly improved performance for the FeCoS-based deposit compared to FeS and CoS individually.
将硫化铁（FeS）和硫化钴（CoS）的等摩尔混合物脉冲激光辐照到钽（Ta）衬底上，可一步形成双金属铁钴硫化物。使用扫描电子显微镜、拉曼光谱、X射线光电子能谱、X射线衍射、高分辨率电子显微镜和电子衍射等互补分析技术，证实了纳米晶镍黄铁矿[FeCoS]和磁赤铁矿[γ-FeO]的存在。其发生机制涉及激光电离的铁、钴和硫物种的反应性相互作用，随后这些物种经历快速的非平衡冷却和沉积。硫化钴与铁离子/原子的较高沉积倾向导致形成FeCoS。密度泛函理论（DFT）支持了这一提出的机制，该理论提供了对FeCoS中Fe比FeCoS中Co具有更高热力学稳定性的更深入理解。基于FeCoS的沉积物对亚甲基蓝日光驱动和类芬顿降解表现出增强的催化效率。相比之下，对于磺胺甲恶唑和甲氧苄啶的太阳光驱动降解，与FeS和CoS相比，基于FeCoS的沉积物没有表现出增强的催化活性。此外，析氧反应（OER）的电化学测试表明，与单独的FeS和CoS相比，基于FeCoS的沉积物性能有显著改善。
