Dysprosium regulated platinum particles as a bimetallic alloy catalyst for oxygen reduction reaction

Pt rare earth compounds have recently been investigated as potential substitutes.In this study,the hydrogen reduction method was used to prepare the Pt-Dy bimetallic catalyst,and a number of characterizations were conducted for structure and morphological research.The high resolutiontransmission electron microscopy(HR-TEM) and X-ray diffraction results show that Pt-Dy composite material exists in the form of various alloys and has a clear spherical shape.The majority of the metals in the composite catalyst appear in the zero valent state,and the binding energy of Pt shifts significantly,according to an X-ray photoelectron spectroscopy measurement.Impressively,Pt-Dy alloy produces excellent mass activity of 594 A/g compared to commercial Pt/C catalyst(162.8 A/g) for oxygen reduction process.Furthermore,after an accele rated durability test,the catalytic activity loss for Pt-Dy alloy catalyst reaches 20% while commercial Pt/C reduces 56%.