Electrochemical properties of PtPdRh alloy catalysts for ammonia electrocatalytic oxidation

摘要

The study of the electrochemical oxidation (ECO) of ammonia (NH_3) is becoming increasingly an important issue in environmental electrochemistry. For this investigation of platinum-containing electrode material was synthesized by coprecipitating H_2PtCl_6, Pd(NO_3)_3 and Rh(NO_3)_3 and employed as a typical electrocatalytic reaction such as NH_3-ECO for fuel cell application. In this study, ECO ability immersed in a 0.5 M H_2SO_4 solution, where the electrolyte was measured using an electrochemical cyclic voltammetry (CV) technique. Furthermore, the electrocatalytic materials were analyzed by UV-Vis absorption spectra, excitation-emission fluorescent matrix (EEFM) spectroscopy, and zeta potential. Preliminary experimental results showed that the activity of the PtPdRh alloy catalysts using a high potential scan rate; the maximum current density reached for the NH_3-ECO in the voltage range of 0.2 V. Additionally, EEFM was applied to evaluate the freshly prepared catalyst yields for the fluorescent peak at 300/400 nm is associated with the Pt clusters, and UV-Vis absorption spectra revealed that the platinum (IV) species were observed at about 350 nm.