Potentiostatic deposition of differently shaped Pt and PtBi nanoparticles

摘要

This article presents a comparative study of the deposition behaviors of Pt and PtBi nanoparticles on glassy carbon.Sea-urchin-like Pt nanoparticles and spherical PtBi nanoparticles were produced by potentiostatic deposition.Chronoamperometric characterizations show that the Pt electrodeposition corresponds to the mechanism for 3D progressive nucleation and growth.The sea-urchin-like morphology can be attributed to the effect of applied potential and the electroadsorption of hydrogen and trace Cl-.The PtBi electrodeposition fits well to the mechanism for 2D progressive nucleation at t/t max1.5,and there is a transition from 2D adlayer to 3D clusters at t/t max[1.5.The spherical PtBi nanoparticles result from the three effects caused by bismuth co-electrodeposition:higher overpotential,strengthened affinity to Cl-,and improved hydrogen evolution.These results suggest that the adsorption of solution anions and cations on the deposit surface can be used to change the morphologies of the deposits.