Novel snowflake-like Pt-Pd bimetallic clusters on screen-printed gold nanofilm electrode for H _2O _2 and glucose sensing

摘要

Novel snowflake-like Pt-Pd bimetallic nanoclusters (Pt-PdBNC) were synthesized on a screen-printed gold nanofilm electrode (SPGFE) substrate by electrochemically reducing precursors with a new constant potential/multi-potential step deposition strategy. The electrocatalytic behavior of the modified electrode (SPGFE/Pt-PdBNC) towards H _2O _2 was investigated. The results indicate that the as-prepared Pt-PdBNC significantly enhances the electrochemical reduction of H _2O _2 in neutral media, exhibiting preferable electrocatalytic performance compared to Pt and Pd monometallic nanoclusters. Under optimum conditions, SPGFE/Pt-PdBNC offers linear responses for H _2O _2 in the concentration range from 0.005 to 6mM with an ultrahigh sensitivity of 804mAM ~(-1)cm ~(-2) and excellent selectivity. Furthermore, glucose oxidase was immobilized on the Pt-PdBNC structure, and the fabricated biosensor presents favorable properties for glucose sensing.