In this study, we have introduced a simple method for developing the lithium cobalt iron oxide (Li_0.3CoFe₂O₄, LCFO) nanoparticles by sol–gel and solid-state sintering methods using lithium nitrate, cobalt nitrate hexahydrate, and iron oxide as precursors. The electrochemical performance of LCFO was further improved by combining graphene (LCFO-Gr). The synthesized LCFO-Gr nanocomposite exhibited cubic face-centered structure with an average particle-size distribution of 26 nm as estimated from XRD, FESEM, and TEM studies. A novel electrochemical sensor was fabricated by placing LCFO-Gr nanocomposite on the surface of glassy carbon electrode by drop-casting method, which demonstrated superior electrocatalytic activity, sensitivity, and selectivity towards the determination of dopamine. Additionally, as a cathode material, it delivered high discharge capacity of 153 mAh g⁻¹ with good cycling stability, suggesting LCFO-Gr nanocomposite as a prominent material for the next-generation lithium-ion batteries.

Graphic abstract

中文翻译：

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用于多巴胺电化学传感和锂离子电池阴极的双功能化锂钴铁氧化物/石墨烯纳米结构复合材料的合成与表征

在本研究中，我们介绍了一种开发锂钴铁氧化物（Li _0.3 CoFe ₂ O ₄, LCFO) 纳米颗粒通过溶胶-凝胶和固态烧结方法使用硝酸锂、六水合硝酸钴和氧化铁作为前体。通过结合石墨烯（LCFO-Gr）进一步提高了LCFO的电化学性能。根据 XRD、FESEM 和 TEM 研究估计，合成的 LCFO-Gr 纳米复合材料具有立方面心结构，平均粒径分布为 26 nm。通过滴铸法将LCFO-Gr纳米复合材料置于玻碳电极表面，制备了一种新型电化学传感器，该传感器对多巴胺的测定表现出优异的电催化活性、灵敏度和选择性。此外，作为正极材料，它提供了 153 mAh g ^{-1 的}高放电容量 具有良好的循环稳定性，表明 LCFO-Gr 纳米复合材料是下一代锂离子电池的重要材料。

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