Towards Understanding a Distinct Hydrogen Peroxide Electrocatalytic Enhancement Using Surfactant-Based Coatings on Silve
- PDF / 5,553,890 Bytes
- 7 Pages / 612 x 792 pts (letter) Page_size
- 30 Downloads / 171 Views
Towards Understanding a Distinct Hydrogen Peroxide Electrocatalytic Enhancement Using Surfactant-Based Coatings on Silver A. Goodison1, L. Gonzalez-Macia2, A. J. Killard2, A. Morrin1 1
School of Chemical Sciences, National Centre for Sensor Research, Dublin City University, Dublin 9, Ireland 2 Centre for Research in Biosciences, Department of Applied Sciences, University of the West of England, Coldharbour Lane, Bristol BS16 1QY, UK ABSTRACT The detection of hydrogen peroxide has been shown to be very important in recent years due to its role in many industrial applications, as well as in biological reactions. Previously, a commercial silver flake-based ink (PF-410, Acheson®), when screen-printed as films to substrate and subsequently coated with surfactant and salt (sodium dodecylbenezene sulphonate (SDBS) and KCl), have been shown to significantly enhance the electrochemical reduction of hydrogen peroxide – up to 80-fold over non-modified films. In this study, an attempt to understand the effect of the silver material within the ink on the catalytic behaviour of the films, as well as the distinct change in behaviour upon modification with surfactant/salt are examined. Factors including Ag morphology, presence of dispersant and Ag material supplier are all investigated to assess their effects on the electrocatalytic breakdown of hydrogen peroxide. To do this, a range of inks were formulated from various Ag materials, e.g., flakes and nanoparticles of various sizes. These inks were then cast as coatings onto conventional glassy carbon (GC) electrodes, and their electrocatalytic behaviours, both as modified and non-modified films were studied. INTRODUCTION The electrocatalytic reduction of hydrogen peroxide is important for a wide range of applications including chemical sensing in the environment [1], biosensing for diagnostic applications [2], fuel cells and batteries [3], and others. This research involves an investigation into the electrocatalytic reduction of a hydrogen peroxide at a range of Ag materials under specific conditions. It has been observed previously that a significant enhancement of the catalysis of hydrogen peroxide occurs on screen-printed Ag electrodes when the surface has been modified with an optimised solution of surfactant and salt [4, 5]. This study looks at the effect of varying the silver material comprising these catalytic silver electrode surfaces. It is well-known that the efficiency of catalytic processes can be dramatically affected by the size, shape, and surface morphology of metallic materials as these factors can play pivotal roles in controlling the physical, chemical, optical, and electronic properties of both micro- and nano-structured materials. For instance, a novel silver nanocluster was recently synthesized using a DNA template with short guanine at the 3′-end of a DNA scaffold to enhance the fluorescence intensity. The obtained DNA-stabilized silver nanoclusters were found to exhibit a strong red fluorescence at 605 nm and its fluorescence was sensitively quenched by
H
Data Loading...
