Pd-Sn alloy nanoparticles for electrocatalytic methanol oxidation: Phase evolution from solid solution to intermetallic compounds  

作　　者：Jinna Xue Zheng Hu Hui Li Yu Zhang Chang Liu Min Li Qiuhua Yang Shi Hu 

机构地区：[1]Department of Chemistry,School of Science,Tianjin Key Laboratory of Molecular Optoelectronic Science,Tianjin University,Tianjin 300072,China [2]Institute of Energy,Hefei Comprehensive National Science Center,Hefei 230000,China

出　　处：《Nano Research》2022年第10期8819-8825,共7页纳米研究（英文版）

基　　金：support from the Natural Science Foundation of Tianjin,China(No.18JCYBJC20600);Institute of Energy,Hefei Comprehensive National Science Center(No.19KZS207).

摘　　要：Developing efficient catalysts with high activity and durability via alloying strategy is essential to the energy conversion in various electro-catalytic reactions.Among the different alloy structures,intermetallic compounds(IMCs)have received much attention recently due to the special geometric and electronic effects and outstanding activity and durability,endowed by their ordered structure.Herein,A series of hollow-structured nanocrystals of Pd-Sn alloy,including face-centered cubic solid solution of Pd(Sn),IMCs of Pd_(2)Sn,and IMCs of Pd_(3)Sn2,are fabricated via a solvothermal strategy by varying the precursor ratio of Pd and Sn.The structure difference of the nanocrystals has been investigated via combined electron microscopy and spectroscopy,assisted by local elemental separation analysis and X-ray spectroscopy.Among all,Pd_(3)Sn_(2)IMCs show outstanding methanol oxidation reaction(MOR)activity in terms of mass activity(1.3 A·mgPd^(−1))and specific activity(5.03 mA·cm^(−2)).Through density functional theory(DFT)simulation calculations on three different Pd-Sn alloy models,the performance has been well understood.As compared with Pd(Sn)and Pd2Sn,the high MOR kinetics on Pd_(3)Sn_(2)is featured by its weaker CO adsorption and favorable CO–OH co-adsorption.

关 键 词：Pd-Sn alloy intermetallic compound hollow structure ELECTROCATALYSIS methanol oxidation reaction 

分 类 号：O643.36[理学—物理化学] TB383[理学—化学]