Electrochemical Characterization of Platinum Nanotubules Made via Template Wetting Nanofabrication

Abstract

Standard oxidation-reduction reactions such as those of ferrocyanide and ferrocene have long been employed in evaluating and comparing new electrode structures with more traditional configurations. A variety of nanostructured carbon electrodes developed in recent years have been reported to exhibit faster electron transfer kinetics than more traditional carbon structures when studied with these redox reactions. This type of comparison has not been widely explored for nanostructured platinum electrodes that have become increasingly common. In this work, a platinum nanotubule array electrode was fabricated via a simple template-based process and evaluated using the standard ferrocyanide redox reaction. The nanotubule array electrodes were observed to more closely approach ideal reversible behavior than a typical Pt black/Nafion fuel cell electrode or a standard polished Pt disc electrode. The apparent heterogeneous electron transfer coefficient was determined using the Nicholson method and found to be one to two orders of magnitude greater for the nanotubule array electrodes, depending on the diameter of the nanotubules, in comparison with these same two more traditional electrode structures.

Facile and One-Step in Situ Synthesis of Pure Phase Mesoporous Li2MnSiO4/CNTs Nanocomposite for Hybrid Supercapacitors

“…The presence of obvious redox peaks in the CV curves of the synthesized samples reveals that the main contribution to the charge storage comes from redox pseudocapacitive reactions. Gogotsi et al suggested that these redox pseudocapacitive reactions are the consequence of insertion/deinsertion of K + ions into holes/voids of electrode material from/to the electrolyte and essentially occur only on the surface and/or very close to the surface up to depth L ≪ (2 Dt ) 1/2 inside the active material, where D is the diffusion coefficient for charge-compensating ions (cm 2 /s) and t is time (s). , It is well understood that intercalation/deintercalation (diffusion) as well as capacitive (EDLC and/or surface pseudocapacitive) current both strongly depend on the scan rate. To explore this fact, we have conducted the CV tests at different scan rates and observed that for all the test samples average peak current ( i p ) exhibits a linear relationship with the square root of the scan rate ( v 1/2 ) (Figure S2).…”

Green synthesis of Cu/Cu2O/CuO nanostructures and the analysis of their electrochemical properties

“…Current developments in nanotechnology, particularly the capability to synthesise highly methodical nanomaterials of any shape and size, have led to the production of innovative materials. The characters of metal and metal oxide nanomaterials have been of great interest due to their distinctive feature such as catalytic activity, optical, magnetic and electrical properties [4][5][6][7][8][9]. Nanoparticles coordination with biological entities (e.g., microorganisms) has created a succession of nanoparticle-biological interfaces that depend on both colloidal forces and dynamic biophysicochemical interactions [2,5,6].…”

Optimization of Electrochemical Visualization of Latent Fingerprints with Poly(Neutral Red) on Brass Surfaces

“…Electrochemical characterization of the properties of the brass substrate was performed by the CV method in KNO 3 solution in the presence of [Fe (CN) 6 ] 4− /[Fe (CN) 6 ] 3− ions to study the redox properties and electrochemical activity of the given surface [ 36 , 37 ].…”