Bulletin of the Chemical Society of Japan
Online ISSN : 1348-0634
Print ISSN : 0009-2673
ISSN-L : 0009-2673
 
Surface Structures and Electrochemical Activity of Palladium–Niobium Binary Alloy Electrodes, and Glucose Biosensor with Palladium–Niobium Binary Alloy Electrode
Toru MatsumotoNaoaki SataKiyoshi KobayashiYoko Yamabe-Mitarai
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2013 Volume 86 Issue 11 Pages 1317-1322

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Abstract

The electrochemical activities of binary metals in a Pd–Nb system were investigated as a function of their compositions, crystal structures, using a hydrogen peroxide and ascorbic acid redox reaction. High activities for the redox reaction of hydrogen peroxide were observed when an alloy of composition 75 atom % Pd–25 atom % Nb (Pd–25Nb) with Pd3Nb phase was used. Tests on six electrodes showed that at a constant potential of 0.7 V, the Pd–25Nb electrode had the best hydrogen peroxide detection capability (Pd–25Nb: 3.2 µA mm−2; Pd: 2.4 µA mm−2; Pt: 2.2 µA mm−2; Pd–10Nb: 1.8 µA mm−2; Pd–30.8Nb: 2.4 µA mm−2; Pd–54.4Nb: 0.6 µA mm−2 for 2 mM hydrogen peroxide). And then, Pd–25Nb gave the best performance in terms of preferential hydrogen peroxide oxidation against ascorbic acid. Subsequently, the Pd–25Nb electrode which had excellent hydrogen peroxide detection capability, Pd and Pt were used for the fabrication of amperometric glucose sensors. To fabricate the glucose sensors, we coated the three electrodes first with γ-aminopropyltriethoxysilane, and then with crosslinked bovine serum albumin and glutaraldehyde containing glucose oxidase. Tests on the Pd–25Nb, Pd, and Pt electrode glucose sensors showed that the Pd–25Nb glucose sensor had a better glucose detection capability than the Pd and Pt glucose sensors: 0.468 µA mm−2 mM−1 for the Pd–25Nb sensor, 0.307 µA mm−2 mM−1 for the Pd sensor, and 0.276 µA mm−2 mM−1 for the Pt sensor with 1.67 mM glucose. We discuss the relation between electrode responses to both hydrogen peroxide and ascorbic acid and electrode surface structures.

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© 2013 The Chemical Society of Japan
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