The Electrosorption of Methane and Its Potentiodynamic Electrooxidation on Platinized Platinum

Sustersic, M. G.; O., R. Córdova; Triaca, Walter Enrique; Arvía, Alejandro Jorge

doi:10.1149/1.2129863

Cited by 33 publications

(30 citation statements)

References 20 publications

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“…Case 1. Sustersic et al [53] showed that methane adsorption on platinum surface started from a potential 0.2 V versus NHE and reached a maximum adsorption peak at 0.25 V (versus NHE). In HT-PEMFC the anode potential does not exceed 50 mV (even at high current densities of 1.5 A cm −2 ) which is far below the minimum potential suggested for methane adsorption.…”

Section: Phosphoric Acid Concentration Temperature and Watermentioning

confidence: 99%

A High Temperature Polymer Electrolyte Membrane Fuel Cell Model for Reformate Gas

Mamlouk

Sousa

Scott

2011

International Journal of Electrochemistry

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A one-dimensional model of a high temperature polymer electrolyte membrane fuel cell using polybenzimidazole (PBI) membranes is described. The model considers mass transport through a thin film electrolyte covering the catalyst particles as well as through the porous media. The incorporation of a thin film model describing reactant gas mass transport through electrolyte covering the electrocatalyst is shown to be an essential requirement for accurate simulation. The catalyst interface is represented using a macrohomogeneous model. The influence of carbon monoxide, carbon dioxide, and methane, which would be present in a reformate gas, is considered in terms of the effect on the anode polarisation/kinetics behaviour. The model simulates the influence of operating conditions, cell parameters, and fuel gas compositions on the cell voltage current density characteristics. The model gives good predictions of the effect of oxygen and air pressures on cell behaviour and correctly simulates the mass transport behaviour of the cell. The model with reformate gas shows that additional voltage losses associated with CO poisoning can lead to loss in voltage of tens of mV and thus reduction in power.

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Section: Phosphoric Acid Concentration Temperature and Watermentioning

confidence: 99%

A High Temperature Polymer Electrolyte Membrane Fuel Cell Model for Reformate Gas

Mamlouk

Sousa

Scott

2011

International Journal of Electrochemistry

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“…Bagotzky et al [13] proposed a mechanism in which a chemisorbed hydrocarbon reacts in combinations of (a) dehydrogenation reactions and (b) reactions with adsorbed hydroxyl groups. Electroadsorption studies of methane have been explained using the Bagotzky mechanism [14]. In situ infrared spectroscopy experiments [15] on electrodes immersed in HClO 4 electrolyte, identified the following species, H AC* @O, HO AC* @O, and @C @O.…”

Section: Several Other Factors Influence the Performance Ofmentioning

confidence: 99%

Mathematical model for a direct propane phosphoric acid fuel cell

et al. 2005

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A mathematical model was developed and used to predict the performance of direct propane phosphoric acid (PPAFC) fuel cells, utilizing both Pt/C state-of the-art electrodes and older Pt black electrodes. It was found that the overpotential caused by surface processes on the platinum catalyst in the anode is much greater than the potential losses caused by either ohmic resistance or propane diffusion in gas-filled and liquid-filled pores. In one comparison, the anode overpotential (0.5 V) was larger than the cathode overpotential (0.3 V) at a current density of 0.4 A cm )2 for Pt loadings 4 mg Pt cm )2 . The need for sufficient water concentration at the anode, where water is a reactant, was indicated by the large effect of H 3 PO 4 concentration. In another comparison, the model predicted that at 0.2 A cm )2 , modern carbon supported Pt catalysts would produce 0.35 V compared to 0.1 V for unsupported Pt black catalysts that were used several decades ago, when the majority of the research on direct hydrocarbon fuel cells was performed. The propane anode and oxygen cathode catalyst layers were modeled as agglomerates of spherical catalyst particles having their interior spaces filled with liquid electrolyte and being surrounded by gasfilled pores. The Tafel equation was used to describe the electrochemical reactions. The model incorporated gas and liquid-phase diffusion equations for the reactants in the anode and cathode and ionic transport in the electrolyte. Experimental data were used for propane and oxygen diffusivities, and for their solubilities in the electrolyte. The accuracy of the predicted electrical potentials and polarization curves were normally within ±0.02 V of values reported in experimental investigations of temperature and electrolyte concentration. Polarization curves were predicted as a function of temperature, pressure, electrolyte concentration, and Pt loading. A performance of 0.45 V at 0.5 A cm )2 was predicted at some conditions.

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“…Useful guidance for the understanding potentio‐dynamic mechanism is to combine the mechanistic data from standard measurements, and in‐situ analysis. Earlier, *CHO, *COOH, and *CO species were suggested to be involved in methane oxidation based on potentio‐dynamic measurements [52–53] . Emerging in‐situ spectroscopic techniques could confirm such considerations.…”

Section: Methane Electro‐engineeringmentioning

confidence: 98%

Advances and Fundamental Understanding of Electrocatalytic Methane Oxidation

2020

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Methane utilization is one of the promising energy‐efficient conversions which can potentially control its emissions as an additional benefit. In this regard, electrochemically methane conversion is particularly attractive as a fossil‐free and sustainable strategy to generate power and fuels of global importance. However, it is relatively less explored. This review aims to highlight the feasibility of the electro‐conversion approach via electrocatalytic methane oxidation (EMO) reaction. The recent progress regarding power generation as well as value‐added fuel/chemical production, such as hydrocarbons, alcohols, acids, and ketones, is summarized. Additional mechanistic insights to increase the fundamental understanding of the EMO reaction pathways underlying various catalytic modes and their challenges are provided. Theoretical modeling focusing on the reactivity trends and performance kinetics is also presented, along with key recommendations for the material design that need to be addressed. Suggesting some insights on catalysts‐related developing directions and chances in the EMO field is concluded.

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The Electrosorption of Methane and Its Potentiodynamic Electrooxidation on Platinized Platinum

Cited by 33 publications

References 20 publications

A High Temperature Polymer Electrolyte Membrane Fuel Cell Model for Reformate Gas

A High Temperature Polymer Electrolyte Membrane Fuel Cell Model for Reformate Gas

Mathematical model for a direct propane phosphoric acid fuel cell

Advances and Fundamental Understanding of Electrocatalytic Methane Oxidation

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