Molecular fluorinated cobalt phthalocyanine immobilized on ordered mesoporous carbon as an electrochemical sensing platform for sensitive detection of hydrogen peroxide and hydrazine in alkaline medium

Non-precious molecular cobalt phthalocyanine (CoPc) complexes have been considered to be promising electrocatalysts due to diversity of substituents and carbon supporting matrixes. Here, we report a highly dispersed fluorinated CoPc (CoPcF16) molecule electrocatalyst immobilized in ordered mesoporous carbon CMK-3 (CMK-3-CoPcF16) via pi-pi interaction. The molecular electrocatalyst is characterized by X-ray photoelectron spectroscopy, Raman spectrum, electronic paramagnetic resonance, scanning electron microscopy, transmission electron microscopy and electrochemical impedance spectroscopy. The combination of fluorine substituents and high loading capability of CMK-3 increase the solubility of CoPc, suppress aggregation, and thereby enhance the electrocatalytic performance. As a result, the CMK-3-CoPcF16 modified electrode shows high electrocatalytic activity towards the oxidation of hydrogen peroxide and hydrazine. CMK-3-CoPcF16 hybrid is successfully presented as an electrochemical sensing platform for sensitive detection of H2O2 and hydrazine with a detection limit of 0.03 and 0.2 mu M, respectively.

Automated summary

In this study, a highly dispersed fluorinated cobalt phthalocyanine (CoPcF16) catalyst immobilized in ordered mesoporous carbon was investigated. The catalyst showed high electrocatalytic activity towards the oxidation of hydrogen peroxide and hydrazine, making it a potential sensing platform for their sensitive detection.