Non-enzymatic sensing of hydrogen peroxide using a glassy carbon electrode modified with a nanocomposite made from carbon nanotubes and molybdenum disulfide

We report on a non-enzymatic electrochemical sensing strategy for ultrasensitive detection of hydrogen peroxide (H 2 O 2 ) at nanomolar levels. A glassy carbon electrode (GCE) was modified with a hybrid material consisting of multiwalled carbon nanotubes (CNT) and molybdenum disulfide (MoS 2 ). Transmission electron microscopy and Raman spectroscopy were employed to characterize the hybrid nanostructures. GCEs modified with carbon nanotubes, or nanoscaled MoS 2 , or with the CNT-MoS 2 hybrid were investigated with respect to sensing H 2 O 2 , and this revealed that the GCE modified with the CNT-MoS 2 hybrid performed best and resulted in a limit of detection as low as 5.0 nM. A repeatability and intermediate precision of 9 % was accomplished. The method was applied to determine H 2 O 2 in spiked sterilized milk and gave satisfactory results. Graphical Abstract A nonenzymatic electrochemical sensing strategy was developed for ultrasensitive detection of hydrogen peroxide at the nanomolar level by using multi-walled carbon nanotube-MoS 2 hybrid nanostructures as peroxidase mimics.