A three-dimensional hierarchical nanoporous PdCu alloy for enhanced electrocatalysis and biosensing

Anal Chim Acta. 2011 Oct 10;703(2):172-8. doi: 10.1016/j.aca.2011.07.039. Epub 2011 Aug 3.

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).

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Alloys / chemistry*
  • Biosensing Techniques / methods*
  • Catalysis
  • Copper / chemistry
  • Electrochemical Techniques
  • Electrodes
  • Formates / chemistry
  • Glucose / analysis
  • Glucose Oxidase / chemistry
  • Glucose Oxidase / metabolism
  • Hydrogen Peroxide / chemistry
  • Lead / chemistry
  • Nanostructures / chemistry*
  • Nanostructures / ultrastructure
  • Oxidation-Reduction
  • Porosity

Substances

  • Alloys
  • Formates
  • formic acid
  • Lead
  • Copper
  • Hydrogen Peroxide
  • Glucose Oxidase
  • Glucose