Atomic-scaled surface engineering Ni-Pt nanoalloys towards enhanced catalytic efficiency for methanol oxidation reaction  

作　　者：Aixian Shan Shuoyuan Huang Haofei Zhao Wengui Jiang Xueai Teng Yingchun Huang Chinping Chen Rongming Wang Woon-Ming Lau 

机构地区：[1]Beijing Advanced Innovation Center for Materials Genome Engineering,Center for Green Innovation,Beijing Key Laboratory for Magneto-Photoelectrical Composite and Interface Science,School of Mathematics and Physics,University of Science and Technology Beijing,Beijing,100083,China [2]Department of Physics,Peking University,Beijing,100871,China [3]Shunde Graduate School of University of Science and Technology Beijing,Foshan,528300,China

出　　处：《Nano Research》2020年第11期3088-3097,共10页纳米研究（英文版）

基　　金：supported by the National Key Research and Development Program of China(No.2018YFA0703700);the National Natural Science Foundation of China(Nos.11674008,11674023,and 51971025);Ministry of Education,China-111 Project(No.B170003);Scientific and Technological Innovation Foundation of Shunde Graduate School,USTB(No.BK19BE024).

摘　　要：Surface engineering is known as an effective strategy to enhance the catalytic properties of Pt-based nanomaterials.Herein,we report on surface engineering Ni-Pt nanoalloys with a facile method by varying the Ni doping concentration and oleylamine/oleicacid surfactant-mix.The alloy-composition,exposed facet condition,and surface lattice strain are,thereby manipulated to optimize the catalytic efficiency of such nanoalloys for methanol oxidation reaction(MOR).Exemplary nanoalloys including Ni_(0.69)Pt_(0.31)truncated octahedrons,Ni_(0.45)Pt_(0.55)nanomultipods and Ni_(0.20)Pt_(0.80)nanoflowers are thoroughly characterized,with a commercial Pt/C catalyst as a common benchmark.Their variations in MOR catalytic efficiency are significant:2.2 A/mgPt for Ni_(0.20)Pt_(0.80)nanoflowers,1.2 A/mgPt for Ni_(0.45)Pt_(0.55)nanomultipods,0.7 A/mgPt for Ni_(0.69)Pt_(0.31)truncated octahedrons,and 0.6 A/mgPt for the commercial Pt/C catalysts.Assisted by density functional theory calculations,we correlate these observed catalysis-variations particularly to the intriguing presence of surface interplanar-strains,such as{111}facets with an interplanar-tensile-strain of 2.6%and{200}facets with an interplanar-tensile-strain of 3.5%,on the Ni_(0.20)Pt_(0.80)nanoflowers.

关 键 词：surface-strain high-index facets Ni-Pt alloy controllable synthesis ELECTROCATALYSIS 

分 类 号：O64[理学—物理化学]