Abstract
• Molecular CoPcF16 is anchored on CMK-3. • The interaction between CoPcF16 and CMK-3 is investigated. • CMK-3-CoPcF16 exhibits high electrocatalytic activity. • Sensitive detection of H 2 O 2 and hydrazine is achieved. 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 π-π 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 H 2 O 2 and hydrazine with a detection limit of 0.03 and 0.2 µM, respectively.
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