Synthesis of Trimetallic Au/Pd/Ag Hollow Dendrite for Enhancing Electrochemical Sensing Ability Toward Nitrofurans

Abstract

This study demonstrated a galvanic replacement reaction that synthesized trimetallic Au/Pd/Ag hollow dendrites in a choline chloride deep eutectic solvent. The dendrites' compositions of Au:Pd: Ag ratio can be well controlled by changing the displacement time and the precursor concentration. Their morphologies, chemical compositions, and electronic properties were carefully characterized by TEM, SEM, and XPS techniques. The synthesized dendrites were also employed as modified electrodes for the reduction of nitrofurans. The results show that the trimetallic Au/Pd/Ag hollow dendrites provided better sensing ability than those obtained from bimetallic Pd/Ag and Au/Ag electrodes and monometallic counterparts. This study demonstrated that both the atomic ratio of constituent metal and hollow interior structure strongly affect the catalytic activities of the synthesized Au/Pd/Ag hollow dendrites.