Excellent electro-oxidation of methanol and ethanol in alkaline media: Electrodeposition of the NiMoP metallic nano-particles on/in the ERGO layers/CE

Karazehir

J of Applied Polymer Sci

et al. 2023

In this study, Pt‐decorated poly(3,4‐ethylenedioxythiophene) (PEDOT) electrocatalyst was uniformly coated electrochemically reduced graphene oxide (ERGO) layer on glassy carbon electrode (GCE) has been created using appropriate procedures to facilitate the implementation of the methanol oxidation reaction (MOR). This multi‐layer catalyst was characterized in each production step via Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, field‐emission scanning electron microscopy and energy‐dispersive x‐ray analysis (FESEM‐EDX) morphological analysis beside the electrochemical tests. The favorable structures of both ERGO and PEDOT increase conductivity and electrocatalytic activity toward methanol oxidation, which may create a suitable matrix for Pt loading thanks to the formation of much more active centers for methanol electrooxidation. The results demonstrate that the electrochemical surface area (ECSA) of Pt/PEDOT/ERGO/GCE was 39.1 m2 g−1, and it has a convenient mass activity (MA with 467 mA mg Pt−1) compared to that of commercial Pt/C. According to chronoamperometric analysis, the current density of Pt/PEDOT/ERGO/GCE was stable during the 1200 s of operation. It demonstrated remarkable stability with a final current density of 4.36 mA cm−2.

Section: Resultsmentioning

confidence: 97%

Section: Morphological Characterizationmentioning

confidence: 99%

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

Karazehir

J of Applied Polymer Sci

et al. 2023

“…Such findings are ascribable to low limitations in reaction kinetics. [59][60][61] Also, as seen in inset of Figure 6, the appearance of a linear relationship between the square root of the potential scan rate (v 1/2 ) and the cathodic and anodic peak current density (Jp) indicates the currents controlled by the diffusion of hydroxide ions. [62,63]…”

Section: Electrochemical Characterizationsmentioning

confidence: 91%

“…[54] More negative onset potentials indicated lower overpotential, more electrocatalytic activity, and better performance in fuel electro-oxidation, which uses potential onset as a key metric in calculating electrocatalytic activity. [59,66] In addition, onset potential for methanol electro-oxidation on Ni/Pp-ABSA/ ERGO/PGE was pushed to lower potentials than on other electrocatalysts. It was clear that the presence of ERGO/Pp-ABSA and Ni (II) ions considerably reduced the onset potential and increased the current density, and that their coexistence in the electrocatalyst composition changed the peak current as well.…”

Section: Electrocatalytic Oxidation Of Methanol At the Ni/pp-absa/erg...mentioning

confidence: 99%

“…Evidently, the increased potential scan rate has improved both anodic and cathodic peak current densities. [59,60] In addition, as the scan rate increases, the anodic peak shifts toward higher potentials, while the cathodic peak shifts toward lower positive potentials. Such findings are ascribable to low limitations in reaction kinetics.…”

Section: Electrochemical Characterizationsmentioning

confidence: 99%

See 1 more Smart Citation

Nanocomposite of Electrochemically Reduced Graphene Oxide and Poly (p‐aminobenzenesulfonic acid) Incorporated with Ni (II) Ions as an Electrocatalyst for the Oxidation of Methanol

Habibi,

Farhadi,

Minaie

2023

ChemistrySelect

Self Cite

A new nanocomposite containing Ni(II) ions, electrochemically reduced graphene oxide (ERGO) and poly (p‐aminobenzenesulfonic acid) (Pp‐ABSA) on pencil graphite electrode (PGE) was prepared using electrochemical deposition coupled with self‐assembly accumulation method and characterized with different techniques. The electrochemical behavior and electrocatalytic activity of modified PGEs were investigated. The Ni/Pp‐ABSA/ERGO/PGE showed a unique electrocatalytic oxidation through an Electrochemical‐Chemical (EC’) pathway for methanol in alkaline media (Jpf=7.04 mA cm−2 and Eonest=0.38 V) compared to Ni/PGE, Ni/Pp‐ABSA/PGE and Ni/ERGO/PGE. The obtained results showed that the self‐assembled incorporation of Ni(II) ions in Pp‐ABSA/ERGO film prepared on PGE surface produced a stable modifier with high electrocatalytic activity towards methanol oxidation. In conclusion, the introduced method for the preparation of Pp‐ABSA/ERGO‐based nanocomposites can open a new, cheap and simple way to design a high‐performance electrocatalyst for direct methanol fuel cell systems.

Binary NiCu oxide nanoparticles onto graphite as promoting nanocatalysts for ethanol electro‐oxidation process

Afify,

Hameed,

Ghayad

2024

Applied Organom Chemis

A facile and reduced cost fabrication protocol was followed to have a series of nickel oxide nanospecies onto graphite support with introducing varied copper oxide wt.% values (NiCuO/T). The co‐precipitation of metallic hydroxide particles onto carbonaceous surfaces and their subsequent burning at 400°C were sufficient to prepare mixed transition metal oxides. Suitable analysis tools were exploited to fully characterize the obtained nanopowders using scanning electron microscopy, transmission electron microscopy, X‐ray diffraction spectroscopy, X‐ray photoelectron spectroscopy, and energy dispersive X‐ray analysis. Outstanding performances of the formed nanocatalysts for catalyzing ethanol electro‐oxidation reaction were measured especially in presence of 15 wt.% copper oxide content. The onset potential (Eonset) value of alcohol oxidation process was negatively shifted at dispersed NiO nanoparticles onto graphite after doping with copper oxide nanospecies. This promoted activity of prepared nanomaterials could be explained by their increased active sites when binary metallic oxides were incorporated. Electrochemical impedance spectroscopy studies demonstrated much lowered resistances in alkaline solution containing ethanol molecules to ascertain the enhanced behavior of NiCuO/T nanocatalysts. Moreover, their good stability attitude encouraged the application of doped nanomaterials with copper oxide for fuel cells application.