Novel tri-metallic (Cobalt, Molybdenum, Platinum) loaded hollow carbon nanotubes for acetaminophen electrochemical sensing

Abstract

In this study, we designed and synthesized a composite metal nanomaterial with cobalt, molybdenum, and platinum trimetallic support to hollow carbon nanotubes for the electrochemical sensing of acetaminophen. We utilized pyrrole with methyl orange under hydrothermal conditions and synthesized hollow polypyrrole nanotube structures. Under the influence of cobalt ions and 2-methylimidazole, the ZIF-67 metal-organic framework (MOF) structure was deposited onto the hollow carbon nanotubes. After high temperature calcination, one step to achieve nitrogen, cobalt and molybdenum co-doping, and finally the precious metal platinum is loaded onto the carbon nanotubes through a metal displacement reaction. Ultimately, a novel type of three-metal cobalt, molybdenum, platinum co-doped hollow carbon nanotubes were obtained. Precious metals have excellent electrocatalytic activity due to their unique chemical structure, while transition metals have good electrical conductivity. Carbon nanotubes have good electrical conductivity and stability because of their large aspect ratio. Therefore, the synergistic effect of cobalt, molybdenum, platinum and carbon nanotubes provides more active sites for the composite material, further enhancing the electrocatalytic activity of the material. The resulting composite exhibits exceptional electrochemical sensing performance for p-acetaminophenol. In this study, a new kind of nano-composite material co-doped with synthetic precious metal and transition metal was proposed for the detection of drug molecules.