Metal/metal oxide@carbon composites derived from bimetallic Cu/Ni-based MOF and their electrocatalytic performance for glucose sensing

A metal/metal oxide@carbon composite(M/MO@C) was prepared by the direct carbonization of bimetallic Cu/Ni-based MOF (Cu/Ni-MOF) to make M/MO nanoparticles distributed well over the porous carbon matrix. The results of XRD and XPS corroborated the existence of Cu2O, CuO, Ni and NiO in M/MO nanoparticles. Due to a synergistic advantage from Cu2O/CuO, Ni/NiO and porous carbon, M/MO@C-800 exhibited an excellent sensing performance to glucose with a wider linear range from 0.1 mu M to 2.2 mM and a lower detection limit of 0.06 mu M. Moreover, M/MO@C-800 also possessed an impressive reproducibility, excellent stability and high selectivity. The satisfactory detection of the glucose in the real samples demonstrated that M/MO@C had a perspective application as a high-performance glucose sensor.