Atom-Ratio-Conducted Tailoring of PdAu Bimetallic Nanocrystals with Distinctive Shapes and Dimensionsfor Boosting the ORR Performance
Wang, JC (Wang, Jingchun)[ 1 ] ; Li, M (Li, Meng)[ 1 ] ; Zhang, JZ (Zhang, Jingzi)[ 1 ] ; Yan, YW (Yan,Yawei)[ 1 ] ; Qiu, XY (Qiu, Xiaoyu)[ 1 ]*（邱晓雨） ; Cai, BF (Cai, Bingfeng)[ 1 ] ; Yang, GX (Yang,Gaixiu)[ 2 ]*; Tang, YW (Tang, Yawen)[ 1 ]*（唐亚文）
[ 1 ] Nanjing Normal Univ, Sch Chem & Mat Sci, Jiangsu Collaborat Innovat Ctr Biomed Funct Mat, Jiangsu Key Lab New Power Batteries, Nanjing 210023, Peoples R China
[ 2 ] Chinese Acad Sci, Guangzhou Inst Energy Convers, CAS Key Lab Renewable Energy, Guangdong Prov Key Lab New & Renewable Energy Res, Guangzhou 510640, Peoples R China
CHEMISTRY-A EUROPEAN JOURNAL,202003,10.1002/chem.201905284
Systematically manipulating the shape, dimension, and surface structure of PdAu nanocrystals is an active subject because it offers a powerful means to regulate and investigate their structure-activity relationship. Meanwhile, it is still urgent to reduce the use of two-dimensional precious-metal-based nanomaterials. This work demonstrates that PdAu nanocrystals with a variety of shapes/dimensions, including 1D anisotropic nanowires, 2D porous nanosheets, and 3D penetrative nanoflowers, can be systematically synthesized by simply adjusting the atomic ratio or the reaction time in the same protocol. The resultant PdAu nanocrystals with distinctive shapes, but the same building blocks triumphantly avoid the effects of facet and surface properties; this represents an ideal platform for directly comparing the oxygen reduction reaction (ORR) activity. 2D porous PdAu nanosheets demonstrate superior ORR performance (E-onset = 1.040 V, E-1/2 = 0.932 V) compared with other-dimension-based samples and commercial Pd black; this is attributed to the abundant surface atoms and omni-directional mass-transfer channels. This work not only paves the way for systematically measuring a series of distinctive PdAu nanocrystals as non-Pt electrocatalysts, but also sheds light on the study of structures/dimensions in tuning the catalytic properties of bimetallic nanocrystals.
文章链接：
https://chemistry-europe.onlinelibrary.wiley.com/doi/full/10.1002/chem.201905284
