Hollow PtNi Nanochains as Highly Efficient and Stable Oxygen Reduction Reaction Catalysts

摘要

Design of electrocatalysts with both enhanced electrochemical activity and high durability is the key challenge in the develop- ment of proton exchange membrane fuel cells (PEMFCs). Herein, hollow platinum nickel nanochains (H-PtNi NCs) were synthesized by the galvanic displacement of Ni nanowires (Ni NWs) and subsequent acid etching, and used for oxygen reduction reaction (ORR). H-PtNi NCs have outer diameter of 50-100 nm, length of 0.5-10 μm, and the average thickness of Pt layer around 4.5-7.5 nm.