A novel Co3Mo3N self-embedded in porous carbon nanocomposite derived from Mo doped ZIF-67: An effective catalyst for electrochemical H2O2 sensing

Abstract

A novel Co3Mo3N self-embedded in porous carbon nanocomposite (Co3Mo3N@PC) derived from Mo-doped ZIF-67 is constructed by a staged calcination method without adding additional nitrogen source. The bimetallic synergy and the composite of porous carbon can tune the electronic structure of the electrocatalyst, which can significantly improve the electrical conductivity and electrocatalytic activity of the Co3Mo3N@PC. As a highly efficient catalyst, Co3Mo3N@PC is first used for H2O2 biosensing with high sensitivity 1177 μA mM−1 cm−2, a lower detection limit of 0.64 μM (S/N = 3) and a wide linear range of 8 μM − 4.5 mM at a low load capacity of 0.4 mg cm−2. This work provides a promising platform for developing the application of transition metal nitrides (TMNs) in the field of electrochemical sensing.