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A novel electrochemical sensor based on Cu3P@NH2-MIL-125(Ti) nanocomposite for efficient electrocatalytic oxidation and sensitive detection of hydrazine

A novel electrocatalyst based on amine-functionalized Ti-based metal–organic framework (NH2-MIL-125(Ti)) embedded with Cu3P nanocrystals (denoted by Cu3P@NH2-MIL-125(Ti)) was synthesized and used for electrocatalytic oxidation and detection of hydrazine in aqueous solution. A series of Cu3P@NH2-MIL-125(Ti) nanocomposites were obtained by adding Cu3P nanoparticles into the preparation system of NH2-MIL-125(Ti), with the Cu3P nanocrystals derived from the phospatization of Cu(OH)2 at high temperature. Based on the detailed characterizations and analysis of the chemical and physical performances of the series of Cu3P@NH2-MIL-125(Ti) nanocomposites at dosages of Cu3P nanocrystals at 5, 20, 50, and 100?mg, the good synergic effect between the Cu3P (50?mg) and the NH2-MIL-125(Ti) endows the as-prepared Cu3P50@NH2-MIL-125(Ti) nanocomposite with the excellent electrocatalytic activity toward the electrocatalytic oxidation of hydrazine. The Cu3P50@NH2-MIL-125(Ti)-based electrochemical sensor exhibited a detection limit of 79?nM (S/N?=?3) within a wider linear range from 5?µM to 7.5?mM. Moreover, the developed sensor exhibited high selectivity toward the detection of hydrazine with the addition of certain common interferents and good applicability in real samples. All of these results imply that the Cu3P50@NH2-MIL-125(Ti) nanocomposite could be promising for detecting hydrazine and offer potential applications in the field of electroanalytical chemistry.

» Author: Minghua Wang, Longyu Yang, Bin Hu, Yongkang Liu, Yingpan Song, Linghao He, Zhihong Zhang, Shaoming Fang

» Reference: Applied Surface Science, Volume 445

» Publication Date: 01/07/2018

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