Shape-dependence in seeded-growth of Pd-Cu solid solution from Pd nanostructure towards methanol oxidation electrocatalyst  

作　　者：Lianxi Si Hui Li Yu Zhang Donghao Zhang Xiaowei An Mengmeng Yao Yuanyuan Shao Jesse Zhu Shi Hu 

机构地区：[1]School of Chemical Engineering and Technology,Tianjin University,Tianjin 300072,China [2]Department of Chemistry,School of Science,Tianjin Key Laboratory of Molecular Optoelectronic Science,Tianjin University,Tianjin 300072,China [3]College of Environmental Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,China

出　　处：《Nano Research》2023年第7期9116-9124,共9页纳米研究（英文版）

基　　金：This work was accomplished under the support of National Natural Science Foundation of Tianjin,China(No.22175127);Institute of Energy,Hefei Comprehensive National Science Center(No.19KZS207).

摘　　要：Ultrathin Pd nanosheets(NSs)have great advantages in catalysis due to their large specific surface area and high percentage of under-coordinated atoms.However,the electrochemical performance still can be improved via composition-controllable growth of their solid solution.Herein,seeded alloying strategy was proposed to synthesize Pd-Cu solid solution from Pd NSs and Pd-Cu nanostructures with tunable molar ratios obtained by changing the amount of Cu precursor.As compared to the pristine Pd NSs,the Pd-Cu solid solution shows significantly enhanced methanol oxidation reaction(MOR)performance over those of Pd NSs and homemade Pd/C as the incorporation of Cu weakens the adsorption of CO intermediate on Pd in the MOR process.The choice of template is pivotal to the growth,as a shape-dependent behavior could be identified in the alloying of Cu with Pd nanosheets enclosed by{111}and{100}facets,Pd nanocubes enclosed by{100}facet,and Pd nano-tetrahedrons enclosed by{111}facet.The Pd-Cu solid solution with tunable composition can only be obtained from Pd NSs and the shape-dependent alloying process is mainly determined by the diffusion barrier and the minimum diffusion depth of the different facets.

关 键 词：Pd-Cu alloy nanosheets tunable composition methanol oxidation reaction optimized electronic structure weakened COadsorption 

分 类 号：TB383[一般工业技术—材料科学与工程]