UV‐Visible Spectroelectrochemical Detection of Side‐Reactions in the Hexacyanoferrate(III)/(II) Electrode Process

Abstract

Hexacyanoferrate(III)/(II) system has been studied by UV-visible long-pathway spectroelectrochemistry. Three different methodologies, based on potentiodynamic techniques, have been successfully used in the thermodynamic characterization of the system. Formation of soluble Prussian Blue has been detected during the electrode process. The values of the formal potential (E 0' 0.200 V) and the electron stoichiometry of this side-reaction (n 0.5) have been obtained.

Development of a Novel Bidimensional Spectroelectrochemistry Cell Using Transfer Single-Walled Carbon Nanotubes Films as Optically Transparent Electrodes

“…9 Although a few mono-dimensional spectroelectrochemistry cells and instruments are commercially available, to the best of our knowledge there are neither BSEC cells nor BSEC instruments probably due to the technical complexity of this technique. By this reason, a new BSEC cell based on optical fibers is presented in this paper.…”

Spectroelectrochemical Sensing: Current Trends and Challenges

“…SEC joins the best of electrochemistry and spectroscopy together during an electron‐transfer process. As can be inferred, this multiresponse and “teamwork” technique has been used in a large number of fields, including, for example, electron transfer processes , chemical reaction mechanisms , side reactions , electrocatalysis , corrosion , conducting polymers , solar cells , memory devices , supercapacitors , synthesis and characterization of nanoparticles , carbon nanomaterials , characterization of metal complexes , liquid/liquid interfaces , electrochromic materials or study of compounds of biological interest , among others.…”

“…SEC can be used with many different purposes, and excellent examples can be found in literature in different fields such as organic molecules , molecules of biological interest , inorganic complexes , conducting polymers , carbon nanotubes , graphene , fullerenes , metal nanoparticles , quantum dots , etc. A huge variety of information can be obtained using SEC, for example, formal potentials , electron transfer rate constants , diffusion coefficients , number of electrons , molar absorption coefficients , band‐gaps , among many others. SEC has also been used in different types of quantitative analysis such as pharmaceutical , food , clinical , environmental or industrial .…”

“…For this reason, a number of papers employ model molecules to demonstrate the capabilities of the technique. Ferro/ferricyanide , o ‐tolidine , ruthenium bipyridine complexes or ferrocenemethanol are molecules widely studied and used for UV/Vis‐SEC. Most advantages of UV/Vis‐SEC were proven using these compounds, but the advantages of this technique in quantitative analysis were scarcely demonstrated .…”

A new reflection–transmission bidimensional spectroelectrochemistry cell: Electrically controlled release of chemicals from a conducting polymer

“…3a. The selected wavelengths, 542 and 418 nm, are characteristic of the charge carriers generated during the oxidation of PPy [31] and of hexacyanoferrate(III) [32], respectively. Absorbance changes in normal configuration (A N ) were measured taking as blank the PPy film immediately after applying +0.5 V. The reference for absorbance in parallel configuration (A P ) was the 0.1 M NaCl solution.…”