Abstract
In the present study, Ir nanoparticles are deposited on the surface of IrO 2 nanoparticles with microwave-assisted polyol process. Then the obtained Ir–IrO 2 nanocomposite is used as a support to prepare Pt/Ir–IrO 2 nanocomposite, which has been demonstrated as an excellent bifunctional oxygen catalyst for unitized regenerative fuel cell. X-ray diffraction (XRD), X-ray photoelectron spectra (XPS), and transmission electron microscopy (TEM) characterizations indicate that ultrafine Ir nanoparticles (NPs) are uniformly dispersed on the surface of IrO 2, which provides a conductive network for Pt NPs. Electrocatalytic activity and stability of Pt/Ir–IrO 2 are investigated using cyclic voltammetry (CV), linear sweep voltammetry (LSV), and potential cycling techniques on rotating disc electrode (RDE). Results show that the electrocatalytic activity of Pt/Ir–IrO 2 towards oxygen reduction reaction (ORR) is much higher than that of Pt/IrO 2, and the electrocatalytic activity of Pt/Ir–IrO 2 towards oxygen evolution reaction (OER) can be comparable to that of Pt/IrO 2. Life tests reveal that Pt/Ir–IrO 2 exhibits excellent stability. The enhanced ORR activity of Pt/Ir–IrO 2 catalyst can be attributed to the improvement in electronic conductivity, and its higher stability can be assigned to the special structure, in which the interaction between Pt NPs and Ir NPs prevents Pt from agglomerating.
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