Vertically Aligned Pd Nanowires for Glucose Oxidase Bioanode

Gymama Slaughter

doi:10.4172/2155-6210.1000124

Abstract

A bioanode for glucose based biofuel cell have been fabricated by combining glucose oxidase and highly ordered Palladium (Pd) nanowire array electrode. The Pd nanowires were 5.57 μm in length and 64.28 nm in diameter. The hydrogel composite modified Pd nanowire array bioanodes were characterized with cyclic voltammetry in the presence of different scan rates and different substrate concentrations under physiological conditions. The electrochemical measurements showed a linear amperometric response in the range of 1 mM to 13 mM. In addition, surface and structural characterization were performed by scanning electron microscopy leading to the conclusion that the Pd nanowires are highly ordered and vertically aligned and thereby promotes the number of electroactive sites for the catalysis of the oxidation of glucose. The combination of glucose oxidase and Pd nanowire arrays revealed the capability of these enzymatic bioanodes to perform direct electron transfer to Pd nanostructure surfaces and be used in a glucose biofuel cell.

Highlights

IntroductionEspecially glucose-O2 biofuel cells are fabricated from a variety of electrode materials [1]
Enzymatic biofuel cells, especially glucose-O2 biofuel cells are fabricated from a variety of electrode materials [1]
We describe the fabrication of a glucose biofuel cell bioanode based on the combination of glucose oxidase and Palladium (Pd) nanowire array electrodes, which has not been reported with respect to glucose-based biofuel cell applications

Summary

Introduction

Especially glucose-O2 biofuel cells are fabricated from a variety of electrode materials [1]. The desire to develop energy sources based on glucose biofuel cells for implantable devices can be attributed to the fact that the bioanode enzymes such as glucose oxidase and glucose dehydrogenase can oxidize glucose at physiological conditions. This permits the extracted glucose from the bloodstream or the interstitial fluid to be used as fuel substrate for energy harvesting under a physiologic conditions. Glucose-based biofuel cells consist of a bioanode and a biocathode at which oxidation-reduction (redox) reactions occur in the presence of the fuel source. The choice of the anodic and cathodic material depends on several factors including but not limited to the biocatalyst to catalyze the electrode reactions; the integration of the biocatalyst with the appropriate physicochemical transduction element for harvesting energy from the various concentration of glucose

Methods

Results

Conclusion