A Pt@IrO2 core-shell catalyst for effective electrocatalytic reduction of concentrated nitric acid.

A core-shell catalyst supported on the carbon fiber paper was developed for the effective electrocatalytic reduction of concentrated nitric acid (4.0 M). The potential range of cyclic voltammetry deposition was adjusted to investigate the influence of the chemical state of electrodeposited Ir on concentrated nitric acid reduction. The results indicate that a core of Pt with a thin IrO 2 shell shows greatly enhanced catalytic activity comparing to the nano-Pt. A Pt@IrO 2 core-shell catalyst was synthesized by a two-step cyclic voltammetry. It shows a high reactivity toward electrocatalytic reduction of concentrated nitric acid (4.0 M). Unlabelled Image • The Pt core with Ir shell catalyst was designed for the effective nitric acid reduction. • The chemical state of Ir shell plays an important role in the reduction process. • The Pt@IrO 2 /CFP electrode shows a higher current density than that of Pt@Ir/CFP. [ABSTRACT FROM AUTHOR]