Carbon-Supported Pt Particles as a Catalyst for Electrooxidation of Methanol and Cyclic Voltammetry Studies Under Acidic Conditions

Abstract

Electrooxidation of methanol on glassy carbon (GC) electrode modified by optimum carbon supported Pt electrocatalyst (Pt-C/GC) in acid media is investigated. The catalyst is prepared by ultrasonicating Pt/C powders in aqueous media. The activity of prepared Pt-C/GC electrode is studied in potential range of 0 -1000 mV (versus SCE) by cyclic voltammetry. The results showed that the Pt/C dispersed layer at the surface of glassy carbon electrode, behaves as an electrocatalyst for the oxidation of methanol in acid medium by optimum loading of Pt (0.2 mg cm À2 ). The electrochemical properties of prepared electrode are studied under various conditions. However the effect of various parameters in the catalytic enhancement of Pt/C, such as platinum loading, sulfuric acid concentration, different scan rates, different final potentials, and medium temperature are considered and examined.

The roles of metal co-catalysts and reaction media in photocatalytic hydrogen production: Performance evaluation of M/TiO2 photocatalysts (M = Pd, Pt, Au) in different alcohol–water mixtures

“…(14)) possibly being a rate-limiting-step in the overall H 2 production kinetics in methanol-water mixtures. An analogy can be made here with electrocatalytic oxidation of methanol over Pt/C, where the rate limiting step is the surface oxidation of CO(a) to CO 2 [65,66]. CO(a) formation could also be expected for photoreactions involving C1 alcohols, but for such alcohols the co-formation of other intermediates may prevent CO accumulation at coverages which could impact H 2 production.…”

Facile synthesis of Pd nanoparticles on nano carbon supports and their application as an electrocatalyst for oxidation of ethanol in alkaline media: The effect of support

“…8). It can be resulted that the electrocatalytic reaction is controlled by diffusion process [61,62]. In addition, the CVs at different scan rate show that the potential of the oxidation peaks in the forward scan varies with increasing of scan rate.…”

Electrocatalytic oxidation of methanol at tantalum oxide-modified Pt electrodes

“…Ag|AgCl|KCl(sat.). This is attributed to the gradual increase of the amount of Pt oxide on the catalyst surface which is undesired for the oxidation of methanol and/or methanol residue during the negative going potential excursion [46,47]. That is, during the negative going potential scan, the oxidation reaction is controlled by the amount of Pt oxide on the catalyst surface.…”