Fabrication of nanoporous Cu-Pt(Pd) core/shell structure by galvanic replacement and its application in electrocatalysis.
We describe a general strategy to fabricate a new type of nanoporous core/shell structured bimetallic nanocomposites with controllable metal components. Nanoporous copper (NPC) obtained by dealloying Cu/Al alloy is used as both reducing agent and three-dimensional substrate. Electron microscope and X-ray diffraction characterizations demonstrated that a simply galvanic-replacement reaction with H(2)PtCl(6) aqueous solution can easily generate nanoporous core/shell structure with a thin Pt/Cu alloy shell and Cu (or Pt/Cu alloy) core. The morphology and crystal structure evolution of the nanocomposites are studied and discussed in detail. The as-prepared bimetallic PtCu nanocomposites show greatly enhanced catalytic activity and stability toward methanol electro-oxidation as compared with commercial Pt/C catalyst. This facile in situ preparation strategy is also suitable for large-scale production of this novel and inexpensive catalyst.
Key Laboratory of Chemical Sensing & Analysis in Universities of Shandong, Department School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, China. chm_xucx@ujn.edu.cn
Caixia
C
Xu
Yunqing
Y
Liu
Jinping
J
Wang
Haoran
H
Geng
Huajun
H
Qiu
D002384:Catalysis; D003300:Copper / Q000737:chemistry; D004563:Electrochemistry / Q000295:instrumentation*; D053761:Nanocomposites / Q000737:chemistry*; D010165:Palladium / Q000737:chemistry; D017671:Platinum Compounds / Q000737:chemistry; D016062:Porosity
D017671:Platinum Compounds; D010165:Palladium; D003300:Copper