Electrocatalytic Oxidation of Formaldehyde on Nickel-Poly(o-Toluidine)-Polyvinylalcohol Modified Glassy Carbon Electrode

2014 ◽  
Vol 543-547 ◽  
pp. 3798-3801
Author(s):  
Yu Xia Liu
Keyword(s):  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Electrocatalytic Oxidation ◽  
Alkaline Media ◽  
Carbon Electrode ◽  
Formaldehyde Concentration ◽  
Nickel Sulphate ◽  
Modified Glassy Carbon Electrode ◽  
Polymeric Layer

The electrocatalytic oxidation of formaldehyde on Nickel-Poly (o-toluidine) - polyvinylalcohol modified glassy carbon electrode (Ni-P(OT)-PVA/GCE) was developed. This involves in situ electropolymerization of o-toluidine at GCE, which is following to the incorporation of Ni (II) to polymeric layer by immersion of modified electrode in 1.0 M nickel sulphate solution. The general electrochemical behavior was characterized by cyclic voltammetry and chronoamperometry methods in alkaline media. The results showed that the Ni-P(OT)-PVA/GCE system exhibits a significant electrocatalytic activity towards oxidation of formaldehyde. The effects of scan rate and formaldehyde concentration on the electrocatalytic oxidation of formaldehyde were also investigated at the surface of Ni-P(OT)-PVA/GCE.

A Novel Electrochemical Sensor for Formaldehyde Based on Platinum Nanoparticle/L-Alanine Modified Glassy Carbon Electrode

2013 ◽  
Vol 562-565 ◽  
pp. 796-801 ◽  
Author(s):  
Jia Hong He ◽  
Qiang Xu ◽  
Zhong Rong Song
Keyword(s):  
Electrochemical Sensor ◽  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Platinum Nanoparticles ◽  
Alkaline Media ◽  
Carbon Electrode ◽  
Formaldehyde Concentration ◽  
Modified Glassy Carbon Electrode ◽  
Platinum Nanoparticle ◽  
Assembly Method

In this paper a novel and sensitive electrochemical sensor for the detection of formaldehyde was developed based on the platinum nanoparticles and L-alanine modified glassy carbon electrode. The sensor was fabricated by two steps. Platinum nanoparticles were immobilized on the electrode via electrodeposition method firstly, then the L-alanine was modified on the electrode by self-assembly method. The structure and morphologies of the Platinum nanoparticles were characterized by SEM and TEM. The electrocatalytic activity of the PtNP-L-alanine/GC electrode for formaldehyde detection in alkaline media was investigated via a series of electrochemical measurements. The PtNP-L-alanine/GC electrode show very high electrochemical activity toward formaldehyde. The oxidation peak current had a linear relationship with the formaldehyde concentration in the 0.3 µmol dm-3 to 4.0 mmol dm-3 range (R=0.9998), while the detection limit was estimated to be 34 nmol dm-3 (S/N=3). Such high sensitivity was attributed to the large surface area of the highly dispersed nanoparticles for electrocatalytic reaction and the fast electron transfer in the composite electrode. It demonstrated that glassy carbon electrode modified by platinum nanoparticles and L-alanine was suitable for the determination of formaldehyde.

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