Article thumbnail

Nanoporous PtAg and PtCu alloys with hollow ligaments for enhanced electrocatalysis and glucose biosensing

By Caixia Xu, Yunqing Liu, Fa Su, Aihua Liu and Huajun Qiu

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<sub>2</sub>PtCl<sub>6</sub>. Electron microscopy and X-ray diffraction characterizations demonstrate that NPS and NPC with similar ligament sizes (30&ndash;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 &sim;3 nm. The as-prepared NPS-Pt and NPC-Pt exhibit remarkably improved electrocatalytic activities towards the oxidation of ethanol and H<sub>2</sub>O<sub>2</sub> 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&ndash;20 mM).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 similar to 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). (C) 2011 Elsevier B.V. All rights reserved

Topics: Dealloying, Galvanic replacement, Electrocatalyst, Hollow nanostructure, Glucose biosensor, 生物资源::生物传感器技术, Science & Technology, Life Sciences & Biomedicine, Physical Sciences, Biophysics, Biotechnology & Applied Microbiology, Chemistry, Analytical, Electrochemistry, Nanoscience & Nanotechnology, Biophysics, Biotechnology & Applied Microbiology, Chemistry, Electrochemistry, Science & Technology - Other Topics, DIRECT ELECTRON-TRANSFER, CARBON NANOTUBES, PLATINUM NANOPARTICLES, HORSERADISH-PEROXIDASE, HYDROGEN-PEROXIDE, SOL-GEL, GOLD, PLATFORM, ENZYME, FILM
Year: 2011
DOI identifier: 10.1016/j.bios.2011.06.036
OAI identifier: oai:ir.qibebt.ac.cn:337004/1217
Download PDF:
Sorry, we are unable to provide the full text but you may find it at the following location(s):
  • http://124.16.151.184:8080/han... (external link)
  • Suggested articles


    To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.