title: Nanoporous PtAg and PtCu alloys with hollow ligaments for enhanced electrocatalysis and glucose biosensing.
abstract: Nanoporous silver (NPS) and copper (NPC) obtained by dealloying AgAl and CuAl alloys, respectively, were used as both three-dimensional templates and reducing agents for the fabrication of nanoporous PtAg (NPS-Pt) and PtCu (NPC-Pt) alloys with hollow ligaments by a simple galvanic replacement reaction with H(2)PtCl(6). Electron microscopy and X-ray diffraction characterizations demonstrate that NPS and NPC with similar ligament sizes (30-50 nm) have different effects on the formed hollow nanostructures. For NPS-Pt, the shell of the hollow ligament is seamless. However, the shell of NPC-Pt is comprised of small pores and alloy nanoparticles with a size of ∼3 nm. The as-prepared NPS-Pt and NPC-Pt exhibit remarkably improved electrocatalytic activities towards the oxidation of ethanol and H(2)O(2) compared with state-of-the-art Pt/C catalyst, and can be used for sensitive electrochemical sensing applications. The hierarchical nanoporous structure also provides a good microenvironment for enzymes. After immobilization of glucose oxidase (GOx), the enzyme modified nanoporous electrode can sensitively detect glucose in a wide linear range (0.6-20 mM).
authors.affiliation: School of Chemistry and Chemical Engineering, University of Jinan, Jinan, China. chm_xucx@ujn.edu.cn
authors.forename: Caixia
authors.initials: C
authors.lastname: Xu
authors.forename: Yunqing
authors.initials: Y
authors.lastname: Liu
authors.forename: Fa
authors.initials: F
authors.lastname: Su
authors.forename: Aihua
authors.initials: A
authors.lastname: Liu
authors.forename: Huajun
authors.initials: H
authors.lastname: Qiu
mesh_terms: D000497:Alloys / Q000737:chemistry*; D015374:Biosensing Techniques; D002384:Catalysis; D003300:Copper / Q000737:chemistry*; D004800:Enzymes, Immobilized / Q000737:chemistry; D005947:Glucose / Q000032:analysis*; D005949:Glucose Oxidase / Q000737:chemistry; D008854:Microscopy, Electron; D058608:Nanopores / Q000648:ultrastructure*; D010984:Platinum / Q000737:chemistry*; D012834:Silver / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D000497:Alloys; D004800:Enzymes, Immobilized; D012834:Silver; D010984:Platinum; D003300:Copper; D005949:Glucose Oxidase; D005947:Glucose