Electrooxidation of Aliphatic and Aromatic Amines at a Ni,Al Based Hydrotalcite Modified Electrode

Abstract

The electrocatalytic oxidation of a wide series of aliphatic and aromatic amines was investigated in alkaline solutions at a gold electrode modified with a Ni,Al based hydrotalcite. All the amino compounds, with the exception of pyridine, were detected by the amperometric sensor. Chronoamperometric measurements at a rotating disk allowed us to use the same modified electrode for sequential analysis of several analytes in order to investigate the factors affecting the electrochemical response. By varying the characteristics of the substrate, parameters like steric hindrance, kind of amino group, and number of oxidizable sites have been studied. The concentration ranges, where the amperometric response was linear, have been determined for the amines investigated.

Glyphosate and glufosinate detection at electrogenerated NiAl-LDH thin films

“…Based on previous results relative to the electrooxidation of aliphatic and aromatic amines at NiAl-LDH electrogenerated on a Pt electrode [8,25], the increase of the anodic peak current relative to Ni(II) centres suggests an electrocatalytic oxidation of Glyp, according to the following reactions:…”

“…In this case the sensitivity decreased to 178 mA/M cm 2 over a linear range between 0.01 and 0.3 mM and the LoD was 5 M. As structural feature, Glyp and Gluf are very similar compounds containing primary or secondary amine groups (Scheme 1). Their electro-detection is based on the oxidation of amine in their structure [2,25]. However, the adsorption behaviours of both herbices at NiAl-LDH surface are quite different, which probably modifies the electrocatalytic efficiency of Ni centres.…”

The Determination of Methanol Using an Electrolytically Fabricated Nickel Microparticle Modified Boron Doped Diamond Electrode

“…A large number of molecules have been investigated, including simple alcohols [3,12,17], amines [18], glucose [4, 19 -22] and methane [23]. Alcohols have been of specific interest in recent years, due to their application in direct alcohol fuel cells (DAFCs), a renewable and low cost alternative fuel source to petroleum in conventional vehicles.…”

A Cheap Amperometric and Optical Sensor for Glucose Determination

“…Hydrotalcites (HTs), also known as hydrotalcite like compounds, are employed in the construction of biosensors [8,9], amperometric [10,11] and potentiometric sensors [12], due to their attractive features such as high water content, high mobility of analytes and reaction products, non-toxicity and high chemical and hydrolytic stability.…”

“…Our research group possesses a wide experience in the use of electrodes modified with Ni or Co based layered double hydroxides, which have been used for the amperometric determination of oxidizable substrates in basic solution, exploiting the electrocatalytic activity of nickel or cobalt centers [11,12].…”