Bimetallic Alloyed PtCu Nanocubic Frames with Three‐Dimensional Molecular Accessible Surfaces for Boosting Oxygen Reduction and Glycerol Oxidation Reactions

Three-dimensional (3D) hollow nanoframes with high surface-to-volume ratio and abundant accessible active sites are a type of promising catalysts, albeit with the challenging synthesis by a one-step solvothermal method. In this research, uniform bimetallic PtCu alloyed hollow cubic nanoframes (HCNFs) were synthesized with high yield by a simple, template-free, one-step co-reduction approach, where cetyltrimethylammonium chloride (CTAC), Cl-/O-2, ethanolamine, and oleylamine served as the structure director, oxidative etchant, reducing agent, and co-reductant, respectively. The architectures were characterized by a series of characterization techniques. Combined with the 3D hollow structures, PtCu HCNFs exhibited enlarged specific/mass activities, boosted catalytic activity, and improved durability for the oxygen reduction reaction (ORR) and glycerol oxidation reaction (GOR) compared with Pt nanocubes (Pt NCs), commercial Pt/C (20wt%), and Pt black catalysts in alkaline solutions. This work provides guidelines for the rational design and synthesis of frame-like nanocatalysts with superior catalytic activity and stability.