Novel snowflake-like Pt-Pd bimetallic clusters on screen-printed gold nanofilm electrode for H2O2 and glucose sensing

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 H2O2 was investigated. The results indicate that the as-prepared Pt-PdBNC significantly enhances the electrochemical reduction of H2O2 in neutral media, exhibiting preferable electrocatalytic performance compared to Pt and Pd monometallic nanoclusters. Under optimum conditions, SPGFE/Pt-PdBNC offers linear responses for H2O2 in the concentration range from 0.005 to 6 mM with an ultrahigh sensitivity of 804 mA M-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. (C) 2012 Elsevier B.V. All rights reserved.