In the present work, a silver nanoparticle-encapsulated CoFe₂O₄@reduced graphene oxide composite (Ag NPs/CoFe₂O₄@rGO) was prepared via a simple chemical co-precipitation technique. The formation of the materials was confirmed by various physico-chemical tools, and the composite was tested for photocatalytic and energy storage applications. Ag NPs/CoFe₂O₄@rGO composite demonstrated remarkable plasmonic photocatalytic activity in the degradation (96%) of aqueous solution of methyl violet dye under visible light irradiation. Further, the electrochemical properties of the as-fabricated Ag NPs/CoFe₂O₄@rGO composite Ni foil electrode were elucidated by cyclic voltammetry (CV), galvanostatic charge–discharge (GCD) tests and electrochemical impedance spectroscopy (EIS) in 1 M aqueous KOH electrolyte. Noticeably, Ag NPs/CoFe₂O₄@rGO composite electrode exhibited a specific capacitance of 970 F g⁻¹ at a scan rate of 5 mV s⁻¹ with excellent cycling stability (93% retention after 3000 cycles at 2 A g⁻¹). The favorable performance demonstrated the synergistic effect of CoFe₂O₄ and Ag NPs with improved surface area, rendered through rGO in the composite, thus indicating that the material is promising and efficient for photocatalysis and energy storage devices.

中文翻译：

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通过封装Ag纳米颗粒来调节CoFe2O4@rGO复合材料的效率，用于甲基紫染料和储能系统的光催化降解

在目前的工作中，通过简单的化学共沉淀技术制备了银纳米颗粒包裹的 CoFe ₂ O ₄ @还原氧化石墨烯复合材料（Ag NPs/CoFe ₂ O ₄ @rGO）。各种物理化学工具证实了材料的形成，并测试了该复合材料的光催化和储能应用。Ag NPs/CoFe ₂ O ₄ @rGO 复合材料在可见光照射下对甲基紫染料水溶液的降解 (96%) 表现出显着的等离子体光催化活性。此外，制造的 Ag NPs/CoFe ₂ O ₄的电化学性能@rGO 复合镍箔电极通过循环伏安法 (CV)、恒电流充放电 (GCD) 测试和 1 M KOH 水溶液中的电化学阻抗谱 (EIS) 阐明。值得注意的是，Ag NPs/CoFe ₂ O ₄ @rGO 复合电极在5 mV s ^-1的扫描速率下表现出 970 F g ^-1的比电容，具有出色的循环稳定性（在 2 A g ^{-1 下}3000 次循环后保持 93% ）。良好的性能证明了 CoFe ₂ O ₄和 Ag NPs的协同效应，通过复合材料中的 rGO 呈现具有改善的表面积，从而表明该材料在光催化和储能设备中具有前景和效率。