Facile fabrication of nanoporous platinum by alloying-dealloying process and its application in glucose sensing

In this paper, a facile electrochemical alloying-dealloying technique was performed in aqueous media to prepare a nanoporous platinum (Pt) electrode with high sensitivity for glucose sensing. A homogeneous Pt-Cu alloy was electrochemically deposited on a glassy carbon electrode at room temperature, and then Cu in the alloy was selectively dissolved by electrochemical method from the Pt-Cu alloy resulting in the nanoporous platinum film with a higher surface area. A roughness factor of the electrode was determined from the ratio of the true area to the geometric area, and it was up to 184. This nanoporous platinum exhibits high stability and remarkable catalytic activity for glucose oxidation in pH 7.0 PBS. It is also resistant toward poisoning by some common interfering species such as uric acid and p-acetamidophenol. Under the optimal experimental conditions, the nanoporous platinum film responded to glucose with a good linear dependence in the range from 1.00 x 10(-5) to 8.14 x 10(-3) M and the detection limit was 7.75 x 10(-6) M (S/N = 3). (C) 2012 Elsevier B.V. All rights reserved.