Ying Jie, Xiao Yuxuan, Chen Jiangbo, Hu Zhi-Yi, Tian Ge, Tendeloo Gustaaf Van, Zhang Yuexing, Symes Mark D, Janiak Christoph, Yang Xiao-Yu
School of Chemical Engineering and Technology, Sun Yat-sen University, Zhuhai, 519082, China.
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070, China.
Nano Lett. 2023 Aug 23;23(16):7371-7378. doi: 10.1021/acs.nanolett.3c01190. Epub 2023 Aug 3.
Hierarchical assembly of arc-like fractal nanostructures not only has its unique self-similarity feature for stability enhancement but also possesses the structural advantages of highly exposed surface-active sites for activity enhancement, remaining a great challenge for high-performance metallic nanocatalyst design. Herein, we report a facile strategy to synthesize a novel arc-like hierarchical fractal structure of PtPd bimetallic nanoparticles (h-PtPd) by using pyridinium-type ionic liquids as the structure-directing agent. Growth mechanisms of the arc-like nanostructured PtPd nanoparticles have been fully studied, and precise control of the particle sizes and pore sizes has been achieved. Due to the structural features, such as size control by self-similarity growth of subunits, structural stability by nanofusion of subunits, and increased numbers of exposed active atoms by the curved homoepitaxial growth, h-PtPd displays outstanding electrocatalytic activity toward oxygen reduction reaction and excellent stability during hydrothermal treatment and catalytic process.
弧形分形纳米结构的分级组装不仅具有独特的自相似特征以增强稳定性，还具备高暴露表面活性位点的结构优势以增强活性，这仍然是高性能金属纳米催化剂设计面临的巨大挑战。在此，我们报告了一种简便策略，通过使用吡啶鎓型离子液体作为结构导向剂，合成新型的PtPd双金属纳米粒子（h-PtPd）的弧形分级分形结构。已充分研究了弧形纳米结构PtPd纳米粒子的生长机制，并实现了对粒径和孔径的精确控制。由于其结构特征，如通过亚基的自相似生长控制尺寸、通过亚基的纳米融合实现结构稳定性以及通过弯曲同质外延生长增加暴露活性原子的数量，h-PtPd对氧还原反应表现出出色的电催化活性，并且在水热处理和催化过程中具有优异的稳定性。
