Authors
Long-Fei Zhang, Jing-Ru Xu, Xiao-Han Zhou, Zi-Yi Zheng, Shi-Qi Du, Wen-Jing Ji, Guan-Hua Li, Hao-Ran Li, Shan-Shan Li, Su-Wen Li
Published in
Inorganic chemistry. Jul 10, 2026. Epub Jul 10, 2026.
Abstract
Mercury ions (Hg2+) are highly toxic heavy-metal pollutants in aquatic environments because of their strong mobility and pronounced bioaccumulation. To achieve highly sensitive and anti-interference electrochemical detection of Hg2+, In this study, a three-dimensional (3D) nanoflake electrocatalyst (CFMO) was synthesized using a simple one-step method. By optimizing the Fe loading, an optimized CFMO-2 was prepared. The effects of Fe doping on the material structure, surface electronic states, and sensing performance were systematically investigated. The results show that Fe incorporation effectively regulates the Co2+/Co3+ ratio and promotes the formation of oxygen vacancies (OVs) without destroying the main crystal phase of CoMoO4, thereby reconstructing the surface electronic structure. Benefiting from a more favorable Co2+/Co3+ ratio, abundant OVs, and stronger interfacial electron-transport capability. By optimizing the Fe loading, an optimized CFMO-2 was prepared, with a sensitivity of 26.74 μA μM-1 and a limit of detection (LOD) of 11 nM, together with good anti-interference ability, repeatability, and applicability to real water samples. These results demonstrate that the synergistic optimization of Co valence-state regulation and defect enrichment induced by Fe doping is an effective strategy for improving the electrochemical sensing performance of CoMoO4-based materials toward heavy metals.
PMID:
42430499
Bibliographic data and abstract were imported from PubMed on 11 Jul 2026.
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