Enzyme-Free Electrochemical Glucose Sensors Prepared by Dealloying Pd-Ni-P Metallic Glasses

Yuqiao Zeng,Chunlei Yang,Luyang Chen,Mingwei Chen,Hua Xiang,Akihisa Inoue,Jianqing Jiang,Xuhai Zhang,Shengchen Yang

doi:10.1155/2014/518641

Abstract

We report the formation of enzyme-free electrochemical glucose sensors by electrochemical dealloying palladium-containing Pd-Ni-P metallic glasses. When metallic glasses with different Pd contents are used as the dealloying precursor alloys, palladium-based nanoporous metals with different ligament and pore sizes can be obtained. The chemical compositions of the nanoporous metals also vary according to the different precursor compositions. All the as-obtained nanoporous metals exhibit electrochemical catalytic activity towards the oxidation of d-glucose, indicating that the nanoporous metals prepared by dealloying the Pd-Ni-P metallic glasses are promising materials for enzyme-free electrochemical glucose sensor.

Highlights

Dealloying is a simple and effective way to prepare well-defined nanoporous metals (NPMs) that are regarded as one of the most promising new materials for functional applications in nanotechnology [1,2,3,4,5]
We report the formation of Pd-based NPMs which exhibit high catalytic activity towards the electrochemical oxidation of glucose
With the aim of finding out a proper dealloying potential for the three glasses with different Pd content, the potentiodynamic polarization test is performed on PdxNi80−xP20 ribbon in 0.8 M H2SO4 and 0.2 M H3PO4 solutions and the results are shown in the inset of Figure 2; all the PdxNi80−xP20 ribbons firstly experience a spontaneous passivation in the anodic region, where dealloying can hardly occur due to the extremely low current density

Summary

Introduction

Dealloying (chemical or electrochemical) is a simple and effective way to prepare well-defined nanoporous metals (NPMs) that are regarded as one of the most promising new materials for functional applications in nanotechnology [1,2,3,4,5]. Using Pd30Ni50P20 metallic glass as a dealloying starting alloy, Yu et al succeeded in fabricating pure NPPd which exhibited high catalytic activity towards the oxidation of formic acid [6], indicating that metallic glass is a new suitable system to form useful NPMs. In this study, we report the formation of Pd-based NPMs which exhibit high catalytic activity towards the electrochemical oxidation of glucose. NPPd enzymefree electrochemical glucose sensors with high catalytic activity are successfully prepared by dealloying PdxNi80−xP20 metallic glasses

Experimental

Results and Discussion

Conclusion