An electrochemical catalyst of CUST-581 for methanol oxidation and hydrogen peroxide detection

Abstract

A new Ni-MOF(CUST-581), [(Ni)2(BIMB)1.5(BTB)] [CUST-581, H3BTB = 1,3,5-tris(4-carboxyphenyl)benzene, BIMB = 1,4-bis((1H-imidazolyl)methyl)benzene], was synthesized using the solvothermal method. CUST-581 exhibited not only high current density but also long-term electrochemical stability during the measurement of methanol oxidation reactions. Moreover, CUST-581 was used as an enzyme-free electrochemical sensing platform for the determination of H2O2. The electrochemical sensing performance of the CUST-581 modified glassy carbon electrode for H2O2 was evaluated by cyclic voltammogram and time measurements in alkaline solutions. The sensor showed a good linear range (20 μM-5000 μM), a low detection limit of 0.28 μM, high sensitivity (0.37 mA mM−1 cm−2) and fast response. Importantly, good reproducibility and repeatability, long time stability and excellent selectivity were obtained in the fabricated H2O2 sensor. The results of the actual samples suggest that the Ni-MOF/GCE sensor could be a promising candidate for H2O2 sensing applications.