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. 2022 Mar 14;12(13):8137-8144.
doi: 10.1039/d2ra00040g. eCollection 2022 Mar 8.

Electrochemical preparation of monodisperse Pt nanoparticles on a grafted 4-aminothiophenol supporting layer for improving the MOR reaction

Nguyen Tien Hoang  1 , Pham Truong Thuan Nguyen  2 , Pham Do Chung  3 , Vu Thi Thu Ha  4 , Tran Quang Hung  4 , Pham Thi Nam  5 , Vu Thi Thu  1
Affiliations

Electrochemical preparation of monodisperse Pt nanoparticles on a grafted 4-aminothiophenol supporting layer for improving the MOR reaction

Nguyen Tien Hoang et al. RSC Adv. .

Abstract

The methanol oxidation reaction (MOR) has recently gained a lot of attention due to its application in fuel cells and electrochemical sensors. To enhance the MOR, noble metal nanoparticles should be homogeneously dispersed on the electrode surface with the aid of one suitable support. In this work, 4-aminothiophenol (4-ATP) molecules which contain simultaneously amine and thiol groups were electro-grafted onto the electrode surface to provide anchoring sites, limit aggregation and ensure good dispersion of metal nanoparticles. The results showed a high density of platinum nanoparticles (PtNPs) with an average size of 25 nm on the glassy electrode modified with a 4-ATP supporting layer. Consequently, the MOR was improved by 2.1 times with the aid of the grafted 4-ATP layer. The electrochemical sensor based on PtNPs/4-ATP/GCE is able to detect MeOH in a linear range from 1.26 to 21.42 mM with a detection limit of 1.21 mM.

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Conflict of interest statement

There are no conflicts to declare.

Figures

Fig. 1
Fig. 1. Cyclic voltammograms recorded during electro-grafting 4-ATP on GCE. Scan rate: 50 mV s−1. Electrolyte: 100 mM LiClO4 in EtOH. C4-ATP = 5 mM.
Fig. 2
Fig. 2. Electrodeposition of PtNPs on GCE (A) and 4-ATP/GCE (B).
Fig. 3
Fig. 3. Electrochemical characterization. Cyclic voltammograms of PtNPs/GCE and PtNPs/4-ATP/GCE recorded in 0.5 M H2SO4.
Fig. 4
Fig. 4. EIS spectra recorded in 5 mM Fe(CN)3−/4 in 100 mM KCl solution.
Fig. 5
Fig. 5. SEM images and EDX analysis of PtNPs and PtNPs/4-ATP.
Fig. 6
Fig. 6. MOR mechanism and enhanced MOR signal on PtNPs/4-ATP film. CV curves were recorded in 0.5 M NaOH containing 0.1 M MeOH at scan rate of 50 mV s−1.
Fig. 7
Fig. 7. Effect of grafting conditions of 4-ATP layer on MOR test. Peak current was recorded using CV technique in 0.5 M NaOH containing 0.01 M MeOH at scan rate of 50 mV s−1.
Fig. 8
Fig. 8. MOR effect on PtNPs/4-ATP/GCE at different concentrations: (A) cyclic voltammetry curves recorded in 0.5 M NaOH solution containing MeOH at different concentrations; (B) the increase in peak current with increasing MeOH concentration.
See this image and copyright information in PMC

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