Effective Methanol Oxidation with Platinum Nanoparticles-Decorated Poly(2-bromomethyl-2-methyl-3,4-propylenedioxythiophene)-Coated Glassy Carbon Electrode

Abstract

Here, we developed a porous network of bromomethyl-substituted 3,4-propylenedioxythiophene polymer using a simple and efficient technique of electrochemical deposition used as conductive support for methanol oxidation. Platinum nanoparticles (PtNPs) are well dispersed and decorated on a high surface area of electrochemically deposited Poly(2-bromomethyl-2-methyl-3,4-propylenedioxythiophene (PProDOT-Br) on a glassy carbon electrode (GCE). A thin film of PProDOT-Br acts as a supporting matrix for deposition of PtNPs and improves the interfacial properties between electrode and electrolyte. The PtNPs-decorated PProDOT-Br (Pt/PProDOT-Br) samples were characterized by X-ray diffraction, Fourier transform infrared attenuated total reflectance spectroscopy, atomic force microscopy, and scanning electron microscopy. Furthermore, the electrocatalytic performance of Pt/PProDOT-Br on GCE for methanol oxidation was assessed by cyclic voltammetry, chronoamperometry, and electrochemical impedance spectroscopy measurements. The findings suggest that the use of Pt/PProDOT-Br/GCE assemblies for efficient methanol oxidation in alkaline media with a small intermediate poisoning is promising for applications as anode material in DMFCs, which should be attributed to the PProDOT-Br support providing a larger surface area with porous nature and enabling the adsorption of more CH3OH for further oxidation. The developed porous network PProDOT-Br with high capacitance may also have large potential in supercapacitor applications.

Production of Pt decorated poly(3,4‐ethylenedioxythiophene)/ERGO/GCEas an efficient catalyst for methanol oxidation reaction

“…Accordingly, the anodic and cathodic redox peaks for PEDOT/ERGO were located at 0.32 and −0.51 V due to the redox reactions occurring on the PEDOT 71 . According to Figure 3c, the peak currents associated with the redox process of PEDOT/ERGO increased linearly with increasing scan rates, indicating that the redox process of the PEDOT/ERGO was surface‐controlled 72 . The EIS was used to provide data on the double layer capacitance, charge transfer resistance, and solution resistance of PEDOT/ERGO electrode/electrolyte interface.…”

“…71 According to Figure 3c, the peak currents associated with the redox process of PEDOT/ ERGO increased linearly with increasing scan rates, indicating that the redox process of the PEDOT/ERGO was surface-controlled. 72 The EIS was used to provide data on the double layer capacitance, charge transfer resistance, and solution resistance of PEDOT/ERGO electrode/ electrolyte interface. Figure 3d presented the Nyquist plots of PEDOT/ERGO in 0.1 M Et 4 NBF 4 /ACN electrolyte solution at open circuit potential (OCP), showing that the shape of the plot strongly revealed characteristic features of electrodes based on PEDOT.…”

Effect of supporting electrolyte on capacitance and morphology of electrodeposited poly(3,4-propylenedioxythiophene) derivatives bearing reactive functional groups

“…72 Recently, we have proposed several electropolymerized 3,4-propylenedioxythiophene derivatives bearing reactive functional groups like bromomethyl (ProDOT-Br), tolylsulfonyloxymethyl (ProDOT-OTs), benzyloxymethyl (ProDOT-OBz), and hydroxymethylphenoxymethyl (ProDOT-OPh) as precursors targeting for bioelectronics and supercapacitors. 73,74 Developing robust polymer systems for these applications needs a deep understanding of the relationship between morphology and ionic and electronic conductivity. [75][76][77] Interactions between the electrolyte and electroactive species in redox active PProDOT derivatives are critical for designing higher-performance electrodes for electrochemical energy storage and conversion.…”