Preparation of microporous MoS₂@carbon nanospheres for the electrochemical detection of hydrogen peroxide

Molybdenum sulfide (MoS₂) may be a promising material for biosensing applications due to their remarkable electronic, electrochemical attributes, and luminescence properties. Herein, thin layered MoS₂ deposited on carbon nanospheres with microporosity (m-MoS₂@CNS) was prepared through a simple dip-calcination method. The as-prepared m-MoS₂@CNS exhibits the well-defined pore, high surface area, and good electrical conductivity, which lead to facilitated electron/ion transport during electrochemical reaction. Based on their outstanding electrochemical properties, the m-MoS₂@CNS reveals the excellent performance as a non-enzymatic detection of hydrogen peroxide in a wide concentration range, from 0.1 mM to 20 mM, with high sensitivity (8.89 μA/mM·cm²) and low limit of detection (7.5 μM, S/N = 3). Moreover, the electrode has a favorable selectivity, reproducibility, and fast response time (~ 7 s). Thus, the m-MoS₂@CNS has a great potential as an electrocatalyst for the efficient detection of hydrogen peroxide.