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. 2024 Jul 1;9(28):30583-30593.
doi: 10.1021/acsomega.4c02524. eCollection 2024 Jul 16.

Electrochemical Detection of Nitrite on PANI-TiO2/Pt Nanocomposite-Modified Carbon Paste Electrodes Using TOPSIS and Taguchi Methods

Jong Sung Pak  1 , Pum Hui Jang  1 , Kwang Myong Pak  1 , Won-Chol Yang  2
Affiliations

Electrochemical Detection of Nitrite on PANI-TiO2/Pt Nanocomposite-Modified Carbon Paste Electrodes Using TOPSIS and Taguchi Methods

Jong Sung Pak et al. ACS Omega. .

Abstract

Platinum nanoparticles are widely used in electrocatalysis and sensors. In this work, a novel modified carbon paste electrode based on PANI-TiO2/Pt nanocomposites was developed electrochemically. To improve the performance of the PANI-TiO2/Pt composite-modified electrode, a Taguchi orthogonal array was used for experimental design, and the best values of factors affecting the performance were determined using the technique for order preference by similarity to ideal solution (TOPSIS) and Taguchi optimization methods. The electrochemical catalytic activities of the PANI-TiO2/Pt composite-modified electrode on the oxidation of nitrite was calculated by electrochemical analysis. The experimental results demonstrate that the PANI-TiO2/Pt electrode has pretty excellent electrocatalytic ability for the oxidation of nitrite. The sensing performances of the proposed electrode were evaluated, including linear detection range, sensitivity, LOD, selectivity, and stability for nitrite sensing.

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Conflict of interest statement

The authors declare no competing financial interest.

Figures

Figure 1
Figure 1
Mean relative closeness values of controllable factors at four levels were obtained from TOPSIS.
Figure 2
Figure 2
SEM images of PANI-TiO2 (a) and PANI-TiO2/Pt (b) nanocomposite films.
Figure 3
Figure 3
FTIR spectra of PANI and PANI-TiO2–Pt.
Figure 4
Figure 4
Cyclic voltammograms of the bare CPE, PANI/CPE, PANI-TiO2/CPE, and PANI-TiO2/Pt/CPE electrodes in 0.5 M H2SO4 solutions containing 100 μM nitrite with the scan rate of 100 mVs–1.
Figure 5
Figure 5
Cyclic voltammograms of the CPE/PANI-TiO2/Pt electrode obtained at different scan rates: 20 to 100 mVs–1 in 0.5 M H2SO4 (pH 0) solution containing 100 μM nitrite. Insets: plot of Oxpeak current vs scan rate.
Figure 6
Figure 6
Schematic diagram nitrite sensing of the PANI-TiO2/Pt–modified electrode.
Figure 7
Figure 7
Cyclic voltammograms of CPE/PANI-TiO2/Pt obtained in 0.5 M H2SO4 solution of different concentrations of nitrite (50 μM to 300 μM) at a scan rate of 50 mV s–1. Insets: the Oxpeak current versus different concentrations of nitrite.
Figure 8
Figure 8
Cyclic voltammograms of CPE/PANI-TiO2/Pt in H2SO4 solution with different pH values. Insets: anodic OxPeak current was obtained in an N2-saturated H2SO4 solution by varying its pH values from 0 to 7 in the presence of 500 μM nitrite.
Figure 9
Figure 9
Response current curve of the prepared electrode with different nitrite concentrations.
See this image and copyright information in PMC

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