Mechanism of electro-oxidation of methanol on the platinum electrode

Bagotzky, V.S.; Vassilyev, Yu.B.

doi:10.1016/0013-4686(67)80047-1

Cited by 383 publications

(187 citation statements)

References 15 publications

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“…Again, there remains much work, which can be done on methanol oxidation with unique electrocatalyst and electrolyte combinations . [26,27], involves the following reaction sequence:…”

Section: Gas Diffusion Electrodesmentioning

confidence: 99%

Direct Anodic Oxidation of Methanol on Supported Platinum/Ruthenium Catalyst in Aqueous Cesium Carbonate

Rauhe¹,

McLarnon²,

Cairns³

1995

J. Electrochem. Soc.

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Methanol electro-oxidation was carried out on porous gas diffusion electrodes in Cs2CO~ electrolytes at 100 to 140~ and ambient pressures. It was found that Pt-Ru bimetallic catalysts supported on graphitized carbon provided enhanced performance, compared to supported Pt catalyst. Performance curves, based on unit catalyst mass, for Pt-Ru at 120~ matched or exceeded previously reported performance data for supported Pt or Pt black in concentrated Cs2CO3 electrolytes at 120 to 150~ at 8 arm, and for supported Pt-Ru in concentrated H3PO4 electrolytes at 200~ It was found that the polytetrafluoroethylene (PTFE) content in the reaction layer, and consequently the extent of wetting, had a marked effect on cell performance, and 20 to 30 weight percent PTFE was found to be optimal. Maximum cell performance was found at operating temperatures 10 to 15~ below the boiling pint of the electrolyte.

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“…Again, there remains much work, which can be done on methanol oxidation with unique electrocatalyst and electrolyte combinations . [26,27], involves the following reaction sequence:…”

Section: Gas Diffusion Electrodesmentioning

confidence: 99%

Direct Anodic Oxidation of Methanol on Supported Platinum/Ruthenium Catalyst in Aqueous Cesium Carbonate

Rauhe¹,

McLarnon²,

Cairns³

1995

J. Electrochem. Soc.

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“…The total oxidation mechanism can be summarized as a pattern of parallel reactions which either goes through CO intermediate (path1) or oxygencontaining species to form CO 2 (path 2), as shown in Figure 2.4 [28,29]. The adsorption process takes place in several steps and requires several neighboring places at the surface, forming different species due to the dissociation of the molecule:…”

Section: Mor In Acidic Conditionmentioning

confidence: 99%

Nitrogen-doped graphene with enhanced oxygen reduction activity produced by pyrolysis of graphene functionalized with imidazole derivatives

Borghei

Azcune

Carrasco

et al. 2014

International Journal of Hydrogen Energy

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Direct methanol fuel cells (DMFC) are great candidates for portable power source applications. However, the sluggish reaction kinetics are key challenges in DMFC technology. The state-of-the-art electrocatalysts are Pt-based catalysts supported on carbon black. However, the high price of Pt, corrosion of carbon support and Pt degradation are the main problems.In this thesis, carbon nanomaterials, namely few-walled carbon nanotubes (FWCNTs) and graphitized nanofibers (GNFs) were used as catalyst supports in the search for stable and durable catalysts. PtRu nanocatalysts with similar particle size and composition were synthesized and deposited on FWCNTs and GNFs. The electrochemical activities for methanol oxidation were compared with that of PtRu-carbon black in acidic conditions. The half-cell electrochemical measurements revealed higher activity with PtRu-GNFs and PtRu-FWCNTs. Later, the electrocatalysts were tested in macro-and micro-DMFC. The results revealed the significant influence of the catalyst support, inomer contect, electrode structure, preparation method, as well as the fuel cell architecture on the performance of a specific electrode material. The results also highlighted the necessity of electrode composition optimization when applying new materials at the electrodes, in order to achieve the best activity and durability for a certain electrocatalyst.A special effort was also done to achieve Pt-free electrocatalysts with high activity for the oxygen reduction reaction (ORR) by introducing nitrogen heteroatoms in carbon nanomaterials, namely FWCNTs and graphite nanoplatelets (GNPs). N-FWCNTs exhibited remarkable electrocatalytic activity for ORR in alkaline media, despite their very low nitrogen content (~0.5 at.%). N-FWCNTs performed on par or better than a commercial Pt-C at the cathode of an alkaline DMFC. The N-GNPs exhibited enhanced electrocatalytic activity for ORR compared to pristine GNPs in alkaline media. The results indicated that N-doped carbon nanomaterials could be promising alternatives to their Pt counterparts to reduce fuel cell costs. However, further investigations are necessary to ascertain the real active sites in order to design more efficient and durable ORR electrocatalysts.Keywords Carbon nanomaterials, PtRu catalysts, nitrogen-doping, direct methanol fuel cell ISBN (printed) 978-952-60-6140-5 ISBN (pdf) 978-952-60-6141-2

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“…The investigation of glucose electrochemical oxidation began in 1960s, and has remained a very active research area [5]. Bagotzky and Vassilyev [6] first reported the electro-oxidation behavior of glucose in an acidic medium. At about the same time, Bockris et al [7] studied this reaction at high temperature in alkaline solutions.…”

Section: Introductionmentioning

confidence: 99%

Physioelectrochemical Investigation of Electrocatalytic Oxidation of Saccharose on Conductive Polymer Modified Graphite Electrode

Naeemy

Ehsani

Jafarian

et al. 2015

Journal of Electrochemical Science and Technology

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In this study we investigated the electrocatalytic oxidation of saccharose on conductive polymer-Nickel oxide modified graphite electrodes based on the ability of anionic surfactants to form micelles in aqueous media. This NiO modified electrode showed higher electrocatalytic activity than Ni rode electrode in electrocatalytic oxidation of saccharose. The anodic peak currents show linear dependency with the square root of scan rate. This behavior is the characteristic of a diffusion controlled process. Under the CA regime the reaction followed a Cottrellian behavior and the diffusion coefficient of saccharose was found in agreement with the values obtained from CV measurements.

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Mechanism of electro-oxidation of methanol on the platinum electrode

Cited by 383 publications

References 15 publications

Direct Anodic Oxidation of Methanol on Supported Platinum/Ruthenium Catalyst in Aqueous Cesium Carbonate

Direct Anodic Oxidation of Methanol on Supported Platinum/Ruthenium Catalyst in Aqueous Cesium Carbonate

Nitrogen-doped graphene with enhanced oxygen reduction activity produced by pyrolysis of graphene functionalized with imidazole derivatives

Physioelectrochemical Investigation of Electrocatalytic Oxidation of Saccharose on Conductive Polymer Modified Graphite Electrode

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