Yin Jun, Huang Haiyang, Zhao Cong, Zhu Haoyu, Suo Hui, He Dong, Zhao Chun
State Key Laboratory of Integrated Optoelectronics, JLU Region, College of Electronic Science and Engineering, Jilin University, Changchun 130012, China.
Jilin Province Product Quality Supervision and Inspection Institute, No.2699, YiJu Road, Changchun 130103, China.
Sensors (Basel). 2025 Feb 26;25(5):1415. doi: 10.3390/s25051415.
Transition metal oxides (e.g., MnO) can effectively promote the redox reactions of heavy metal ions through abundant valence changes. However, relatively few studies have been conducted on the application of MnO for the detection of Cd without pre-enrichment conditions. For this reason, in this study, MnO was grown in situ on a carbon cloth substrate by one-step electrodeposition. The effect of the valence composition of MnO and its variation on the Cd without pre-enrichment detection performance was systematically investigated. The morphology, structure, and chemical composition of the materials were fully characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The results show that the deposition of MnO not only significantly increased the active surface area of the electrodes but also facilitated electron transfer through the valence transition of Mn/Mn↔Mn/Mn. The detection of Cd in water samples can be successfully achieved without pre-enrichment, and the electrode has good stability and reproducibility. This study provides a new design idea for applying MnO electrodes in Cd detection without pre-enrichment and provides a reference for further optimization of electrochemical sensors.
过渡金属氧化物（如MnO）可通过丰富的价态变化有效促进重金属离子的氧化还原反应。然而，在无预富集条件下，关于MnO用于检测镉的应用研究相对较少。因此，在本研究中，通过一步电沉积法在碳布基底上原位生长MnO。系统研究了MnO的价态组成及其变化对无预富集检测镉性能的影响。通过扫描电子显微镜（SEM）、X射线衍射（XRD）和X射线光电子能谱（XPS）对材料的形貌、结构和化学成分进行了全面表征。结果表明，MnO的沉积不仅显著增加了电极的活性表面积，还通过Mn/Mn↔Mn/Mn的价态转变促进了电子转移。无需预富集即可成功实现对水样中镉的检测，且该电极具有良好的稳定性和重现性。本研究为MnO电极在无预富集镉检测中的应用提供了新的设计思路，并为进一步优化电化学传感器提供了参考。
