Electrochemical detection of dopamine on a Ni/Al layered double hydroxide modified carbon ionic liquid electrode

In this paper a Ni/Al layered double hydroxide (LDH) was first synthesized and further immobilized on a carbon ionic liquid electrode (CILE), which was prepared by using 1-(3-chlorine-2-hydroxypropyl)-3-methylimidazolium acetate as the modifier. The characteristics of LDH/CILE were investigated by scanning electron microscopy (SEM) and cyclic voltammetry . Under the selected conditions the LDH/CILE showed better electrochemical response towards the detection of dopamine (DA) than the CILE. The parameters of DA electro-oxidation on the LDH/CILE were calculated with the values of the electron transfer coefficient ( α ), the number of electrons transferred ( n ), the apparent heterogeneous electron transfer rate constant ( k s ) and the diffusion coefficient ( D ) as 0.426, 2.25, 1.66   s −1 and 7.06   ×   10 −5   cm 2 /s, respectively. This modified electrode can be further used to detect DA content in the real drug samples.