The objective of this work is twofold: (1) to improve the electrochemical performance of reduced graphene oxide (RGO) by decorating RGO sheets with magnetic nanoparticles (MNPs) and (2) to evaluate the electrochemical performance of RGO and MNP-decorated RGO (MRGO) in various aqueous electrolyte solutions (phosphate buffer solution (PBS) containing ferricyanide, PBS containing ferricyanide and KCl, Na₂SO₄, and KOH). The morphological and structural characteristics of solvothermal synthesized RGO and MRGO revealed the decoration of phase pure Fe₃O₄ nanoparticles on RGO sheets. In FC-PBS-KCl electrolyte solution, MRGO showed higher redox peak current (83.89 μA) and lower peak potential separation (0.11 V) at 50 mV s⁻¹ scan rate compared with that in FC-PBS electrolyte solution. MRGO showed 15.5% higher peak current than that for the RGO in FC-PBS-KCl electrolyte solution. Moreover, the peak current for MRGO in FC-PBS-KCl was increased by 30% when compared with that in FC-PBS electrolyte solution. These results suggest that MRGO in FC-PBS-KCl electrolyte solution can be a good electron pathway between electrode and electrolyte solution for sensing applications. On the other hand, in both Na₂SO₄ and KOH electrolyte solution, RGO and MRGO showed supercapacitive behavior. In KOH, MRGO exhibited higher specific capacitance (180 Fg⁻¹ at 3 A g⁻¹) and superior cyclic stability (87% after 2000 cycles) compared with that in Na₂SO₄. MRGO showed 219% increase in specific capacitance than that of the RGO in KOH electrolyte solution. The superior electrochemical performance of MRGO compared with that of RGO is attributed to the synergistic effect of conductivity of RGO and redox activity of MNPs.

这项工作的目的是双重的：（1）通过用磁性纳米粒子（MNP）装饰RGO板来提高还原氧化石墨烯（RGO）的电化学性能，（2）评估RGO和MNP装饰的RGO的电化学性能（ MRGO）在各种水溶液中（含铁氰化物的磷酸盐缓冲溶液（PBS），含铁氰化物和KCl的PBS，Na ₂ SO ₄和KOH）。溶剂热合成RGO和MRGO的形态和结构特征揭示了在RGO片材上装饰相纯Fe ₃ O ₄纳米粒子。在FC-PBS-KCl电解液中，MRGO在50 mV s ^-1时显示较高的氧化还原峰电流（83.89μA）和较低的峰电位分离（0.11 V）扫描速度与FC-PBS电解质溶液相比。在FC-PBS-KCl电解液中，MRGO的峰值电流比RGO的峰值电流高15.5％。而且，与FC-PBS电解质溶液相比，MRGO在FC-PBS-KCl中的峰值电流增加了30％。这些结果表明，FC-PBS-KCl电解质溶液中的MRGO可以成为电极与电解质溶液之间用于传感应用的良好电子路径。另一方面，在Na ₂ SO ₄和KOH电解质溶液中，RGO和MRGO均表现出超电容行为。在KOH，MRGO表现出较高的比电容（180蛋白原^-1 3 A G ^-1）与以Na比较和优异的循环稳定性（2000次循环后87％）₂ SO₄。在KOH电解液中，MRGO的比电容比RGO的电容高219％。MRGO的电化学性能优于RGO，这归因于RGO的电导率和MNPs的氧化还原活性的协同作用。