Lattice-mismatch-induced formation of defect-rich Pd-Cu alloy nanocages for enhanced formic acid oxidation activity  

作　　者：Zhaojun Liu Zhengyan Wang Zhaoyu Wang Hao Yuan Yuke Bai Xiaoxiao Wang Zerui Mu Chunxia Wu Kai Liu Zhun Hu Chuanbo Gao 

机构地区：[1]Sate Key Laboratory of Multiphase Flow in Power Engineering,Frontier Institute of Science and Technology,Xi’an Jiaotong University,Xi’an 710049,China [2]Institute of Industrial Catalysis,School of Chemical Engineering and Technology,Xi’an Jiaotong University,Xi’an 710049,China

出　　处：《Science China Chemistry》2025年第2期481-491,共11页中国科学(化学英文版)

基　　金：support of the National Natural Science Foundation of China(22371222);the Science Fund for Distinguished Young Scholars of Shaanxi Province(2024JC-JCQN-14);the Key Research and Development Projects of Shaanxi Province(2021GXLHZ-022);the Fundamental Research Funds for Central Universities.Z.L.acknowledges the support from the China Postdoctoral Science Foundation(2023TQ0263);the National Postdoctoral Research Program of China(GZC20232091);the Postdoctoral Research Project of Shaanxi Province(2023BSHYDZZ49);the Fundamental Research Funds for the Central Universities(XZY012023026).

摘　　要：Crystallographic defects in noble metal nanocrystals are recognized as highly active catalytic sites,significantly enhancing activities in many important reactions.Despite their importance,synthesizing noble metal nanocrystals with a high density of defects poses a considerable synthetic challenge.Here,we present a novel lattice mismatch-induced formation mechanism to create high-density defects in noble metal nanocrystals.This approach takes advantage of lattice mismatch to enable nonepitaxial nucleation and growth of a noble metal on a foreign metal substrate,forming abundant noble metal crystallites with random lattice orientations not dictated by the substrate lattice.As these crystallites grow extensively,they merge,forming numerous grain boundaries and yielding defect-rich noble metal nanocrystals.Defect-rich alloy nanocrystals can also be synthesized through a subsequent vacancy-diffusion alloying process.We take defective PdCu alloy nanocages as an example and demonstrate the effectiveness of crystallographic defects in enhancing catalytic performance of noble metal nanocrystals.The nanocages exhibit superior activity in the electrocatalytic formic acid oxidation reaction,which is 1.6 times greater than their defect-free counterparts.Our strategy offers a new avenue for creating defect-rich noble metal nanocrystals as highly efficient catalysts for a wide array of catalytic applications.

关 键 词：noble metal nanocrystals defects non-epitaxial growth ELECTROCATALYSIS formic acid oxidation reaction 

分 类 号：TG1[金属学及工艺—金属学]