title: A three-dimensional hierarchical nanoporous PdCu alloy for enhanced electrocatalysis and biosensing.
abstract: Nanoporous copper (NPC) obtained by dealloying CuAl alloy is used as both three-dimensional template and reducing agent for the fabrication of nanoporous PdCu alloy with hollow ligaments by a simple galvanic replacement reaction with H(2)PdCl(4) aqueous solution. Electron microscopy and X-ray diffraction characterizations demonstrate that after the replacement reaction, the ligaments become hollow tubular structure and the ligament shell is also comprised of small pores and nanoparticles with a typical size of ~4 nm (third order porosity). The as-prepared nanotubular mesoporous PdCu alloy (NM-PdCu) structure exhibits remarkably improved electrocatalytic activity towards the oxidation of formic acid and H(2)O(2) compared with nanoporous Pd (NP-Pd), and can be used for sensitive electrochemical sensing applications. After coupled with glucose oxidase (GOx), the enzyme modified NM-PdCu electrode can sensitively detect glucose over a wide linear range (0.5-20 mM).
authors: Laboratory for Nanobioelectronics & Biosensors, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China.
authors: Aihua
authors: A
authors: Liu
authors: Haoran
authors: H
authors: Geng
authors: Caixia
authors: C
authors: Xu
authors: Huajun
authors: H
authors: Qiu
mesh_terms: D000497:Alloys / Q000737:chemistry*; D015374:Biosensing Techniques / Q000379:methods*; D002384:Catalysis; D003300:Copper / Q000737:chemistry; D055664:Electrochemical Techniques; D004566:Electrodes; D005561:Formates / Q000737:chemistry; D005947:Glucose / Q000032:analysis; D005949:Glucose Oxidase / Q000737:chemistry / Q000378:metabolism; D006861:Hydrogen Peroxide / Q000737:chemistry; D007854:Lead / Q000737:chemistry; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure; D010084:Oxidation-Reduction; D016062:Porosity
chemical_list: D000497:Alloys; D005561:Formates; C030544:formic acid; D007854:Lead; D003300:Copper; D006861:Hydrogen Peroxide; D005949:Glucose Oxidase; D005947:Glucose