化学
X射线光电子能谱
石墨烯
电化学
电极
电子转移
氧化物
密度泛函理论
检出限
催化作用
无机化学
离子
分析化学(期刊)
化学工程
物理化学
计算化学
有机化学
色谱法
工程类
作者
Feng Xie,Zong-Yin Song,Meng Yang,Wan-Chun Duan,Ying-Nan Quan,Xing-Jiu Huang,Wenming Liu,Pin-Hua Xie
标识
DOI:10.1016/j.aca.2022.339607
摘要
Constructing a highly sensitive and selective electrochemical interface is of great significance for the effective detection of Hg2+ in water and biological samples. Herein, Co3O4 nanopolyhedron (NP) anchored on nitrogen-doped reduced graphene oxide (N-RGO) is utilized as the electrode material for the detection of Hg2+ in the range of 0.1 μM-1.0 μM, with high sensitivity (1899.70 μA μM-1 cm-2) and low detection limits (0.03 μM) in natural water. Moreover, the Co3O4-NP/N-RGO modified electrode possesses reasonable anti-interference ability for Hg2+ in the presence of inorganic ions and glucose, which is the basis of its good response to trace Hg2+ in serum. Besides, combined with X-ray photoelectron spectroscopy (XPS) and density functional theory (DFT) calculations, the electron transfer tendency is revealed. Additionally, combined with the electron state density of Co-p, it is speculated that Co3+ is an optimum active site for catalytic reaction. The above results elucidate an electrochemically sensitive interface is constructed to realize the efficient detection of Hg2+, which provides some theoretical guidance for the development of electrochemical sensors.
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