Journal
ANALYTICA CHIMICA ACTA
Volume 703, Issue 2, Pages 172-178Publisher
ELSEVIER
DOI: 10.1016/j.aca.2011.07.039
Keywords
Dealloying; Galvanic replacement; Formic acid; Hollow nanostructure; Glucose biosensor
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Funding
- Chinese Academy of Sciences [KSCX2-YW-BR-7, Y11211110S]
- National Science Foundation of China [51001053, 50871047]
- Shandong Province [ZR2010EQ039, ZR2010ZM071]
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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 H2PdCl4 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 similar to 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 H2O2 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 (0.5-20mM). (C) 2011 Elsevier B.V. All rights reserved.
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