Bimetallic PtM (MÂ =Â Pd, Ir) nanoparticle decorated multi-walled carbon nanotube enzyme-free, mediator-less amperometric sensor for H2O2

► PtPd and PtIr NPs-decorated multiwalled carbon nanotube nanocatalysts (PtM/MWCNTs) were prepared by a modified Watanabe method. ► PtPd/MWCNTs/GC electrode exhibited a low detection limit of 1.2 μM. ► PtPd/MWCNTs/GC electrode with a wide linear range of 2.5-125 μM (R2 = 0.9996). ► A low working potential (0.25 V (SCE)), high sensitivity (414.8 μA mM−1 cm−2) were achieved the PtPd/MWCNTs/GCE.