Exploiting advanced bimetallic oxide as sensing materials for electroanalysis offers new opportunity to improve the electrochemical performance, but still presents a tough challenge. Herein, we synthesized the uniform Fe₂O₃/Mn₃O₄ nanocubes from a framework structure in a facile approach, which were developed as the electrochemical catalyst for individual and simultaneous analysis of Cu(II) and Hg(II) in 0.1 M HAc-NaAc buffer solution (pH5.0). It showed the excellent electrochemical behavior for the simultaneous analysis Cu(II) and Hg(II) with high sensitivities of 69.29 and 190.55 μA μM cm⁻². The corresponding limit of detection values (LODs) were calculated to be 3.94 nM and 1.39 nM, respectively. The excellent electrochemical behavior of Fe₂O₃/Mn₃O₄ could be attributed to the large specific surface area, which could provide a large number of adsorption sites for Cu(II) and Hg(II). Meanwhile, the bimetallic Fe and Mn atoms arranged in the porous nanocubes could offer a synergistic effect and improve the electrochemical activity. Moreover, it could be successfully applied for the simultaneous analysis of Cu(II) and Hg(II) in real water samples with the favorable recovery rate. The results confirmed that the Fe₂O₃/Mn₃O₄ nanocubes could serve as a reliable platform for the simultaneous analysis of Cu(II) and Hg(II).

利用先进的双金属氧化物作为电分析的传感材料为提高电化学性能提供了新的机会，但仍然面临着严峻的挑战。在此，我们以简便的方法从骨架结构合成了均匀的 Fe ₂ O ₃ /Mn ₃ O ₄纳米立方体，将其开发为电化学催化剂，用于单独和同时分析 0.1 M 中的 Cu(II) 和 Hg(II) HAc-NaAc 缓冲溶液 (pH5.0)。它在同时分析 Cu(II) 和 Hg(II) 时表现出优异的电化学行为，灵敏度为 69.29 和 190.55 μA μM cm ^-2. 计算出的相应检测值 (LOD) 限分别为 3.94 nM 和 1.39 nM。Fe ₂ O ₃ /Mn ₃ O ₄优异的电化学行为可归因于较大的比表面积，可为Cu(II)和Hg(II)提供大量吸附位点。同时，排列在多孔纳米立方体中的双金属 Fe 和 Mn 原子可以提供协同效应并提高电化学活性。此外，它可以成功地同时分析实际水样中的Cu(II)和Hg(II)，并具有良好的回收率。结果证实，Fe ₂ O ₃ /Mn ₃ O ₄ 纳米立方体可作为同时分析 Cu(II) 和 Hg(II) 的可靠平台。