Preparation and characterization of three dimensional graphene foam supported platinum-ruthenium bimetallic nanocatalysts for hydrogen peroxide based electrochemical biosensors

The large surface, the excellent dispersion and the high degrees of sensitivity of bimetallic nanocatalysts were the attractive features of this investigation. Graphene foam (GF) was a three dimensional (3D) porous architecture consisting of extremely large surface and high conductive pathways. In this study, 3D GF was used incorporating platinum-ruthenium (PtRu) bimetallic nanoparticles as an electrochemical nanocatalyst for the detection of hydrogen peroxide (H₂O₂). PtRu/3D GF nanocatalyst exhibited a remarkable performance toward electrochemical oxidation of H₂O₂ without any additional mediator showing a high sensitivity (1023.1μAmM^-1cm^-2) and a low detection limit (0.04μM) for H₂O₂. Amperometric results demonstrated that GF provided a promising platform for the development of electrochemical sensors in biosensing and PtRu/3D GF nanocatalyst possessed the excellent catalytic activity toward the H₂O₂ detection. A small particle size and a high degree of the dispersion in obtaining of large active surface area were important for the nanocatalyst for the best H₂O₂ detection in biosensing. Moreover, potential interference by ascorbic acid and uric acid appeared to be negligible.