Abstract Cost-effective solutions for improved performance, activity, and stability are the main concern for the development of energy-storage devices. Generally, reduced graphene oxide (rGO) supported cobalt ferrite (CoF) based electrodes possesses enhanced electrochemical properties in supercapacitor applications such as high specific capacitance (CS) and long cyclic stability due to the presence of multiple oxidation states of cobalt ions, high surface area, and porous nanostructure that enables fast ion-diffusion. Herein, we report a one-pot solvothermal synthesis of glycol functionalised CoF nanoparticles and the composite with rGO for the supercapacitor electrode. Further, bare CoF was annealed at 300 and 500 °C to evaluate the dependency glycol functionalization on the electrochemical behaviour. The CoF-rGO nanocomposites in alkaline (2 M KOH) electrolyte exhibit better electrochemical behaviour compared to bare and annealed CoF. CoF-rGO exhibits high CS of 551 F/g at a scan rate of 2 mV/s with 98% capacitance retention after 2000 cycles. The power law and Trasatti method provide a qualitative analysis of the diffusivity of the nanoparticles at the electrode/electrolyte interface.

中文翻译：

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用于超级电容器的 CoFe2O4 纳米粒子及其 rGO 复合材料的电化学性能

摘要 提高性能、活性和稳定性的经济高效的解决方案是开发储能设备的主要问题。通常，还原氧化石墨烯 (rGO) 负载的铁酸钴 (CoF) 基电极在超级电容器应用中具有增强的电化学性能，例如由于钴离子的多种氧化态、高表面积和高比电容 (CS) 和长循环稳定性和多孔纳米结构，可实现快速离子扩散。在此，我们报告了乙二醇官能化 CoF 纳米颗粒的一锅溶剂热合成以及用于超级电容器电极的 rGO 复合材料。此外，裸 CoF 在 300 和 500 °C 下退火，以评估乙二醇官能化对电化学行为的依赖性。与裸露和退火的 CoF 相比，碱性 (2 M KOH) 电解质中的 CoF-rGO 纳米复合材料表现出更好的电化学行为。CoF-rGO 在 2 mV/s 的扫描速率下表现出 551 F/g 的高 CS，2000 次循环后电容保持率为 98%。幂律和 Trasatti 方法提供了纳米粒子在电极/电解质界面处的扩散率的定性分析。