A Rotating Disk Electrode Apparatus for the Study of Fuel Cell Reactions at Elevated Temperatures and Pressures

McBreen, J.; O’Grady, W.E.; Richter, Raphael

doi:10.1149/1.2115782

Cited by 28 publications

(15 citation statements)

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“…Various Tafel slopes have been reported for phosphoric acid fuel cells in the range of 90 and 135 mV dec −1 (α = 0.93− 0.62) at 150 • C [26][27][28][29][30][31][32]. An average value of alpha equal to 0.75 (112 mV dec −1 ) was considered in this work.…”

Section: Phosphoric Acid Concentration Temperature and Watermentioning

confidence: 99%

“…As shown elsewhere [23], values of transfer coefficient changed with doping level. For example, at 150 • C, the lowest Tafel slope observed at the minimum doping level of 4.5 PRU (4.5 mole per repeat PBI unit) was 92 mV dec −1 (α = 0.91) which increased to 104 mV dec −1 (α = 0.81) at a doping level of 10 PRU [24,25] and to 90-135 mV dec −1 (α = 0.93-0.62) for phosphoric acid fuel cells [26][27][28][29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

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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%

Section: Introductionmentioning

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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“…Methods involving macroelectrodes such as RDE [30] or RRDE [20] have the potential for fast determination of c and D, but they are impeded by the low solubility of O2 in concentrated PA. In this regard, working in pressurized systems is advantageous [31][32][33][34]. As a step towards studying the ORR at realistic conditions in pressurized half-cell setups, in the present study we therefore investigate the oxygen solubility and diffusivity in diluted phosphoric acid electrolyte in a temperature range of 5 to 80 °C.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of temperature and electrolyte concentration dependent Oxygen solubility and diffusivity in phosphoric acid

Fleige

Holst-Olesen

Wiberg³

et al. 2016

Electrochimica Acta

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Reactant diffusion and solubility is of utmost important for providing sufficient reactant concentrations at a catalytic active surface. In high temperature proton exchange membrane fuel cells (HT-PEMFCs) the electrolyte consists of concentrated phosphoric acid embedded into a polybenzimidazole (PBI) membrane. Despite the elevated operation temperature of 150°C, the observed oxygen reduction reaction (ORR) rates in HT-PEMFCs are significantly lower than in low temperature PEMFCs. Reduced reactant transport in combination with site blocking is often mentioned as possible inhibition factors. As a step towards studying the ORR under realistic conditions in half-cell setups, in the present study we investigate the oxygen solubility and diffusivity in diluted phosphoric acid electrolyte in a temperature range of 5 to 80 °C. The presented 2 work demonstrates and discusses under which conditions reliable data for these constants can be obtained. In particular it is shown that the product of oxygen solubility and diffusivity, which determines the oxygen mass transport, first increases as function of temperature, but then decreases again above 60 °C. It seems that the decrease in oxygen solubility at higher temperatures is correlated to an increase in the apparent ORR activation energy.

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“…Rotating disk voltammetric measurements were made using a 3 mm diameter glassy carbon working electrode driven by an AFMSRX Analytical Rotator System. McBreen et al (1984) described a rotating disk electrode apparatus for www.ccsenet.org/mas Modern Applied Science Vol. 10, No.…”

Section: Rotating Disk Electrode Apparatusmentioning

confidence: 99%

Rotating Disk Apparatus: Types, Developments and Future Applications

Rashed¹,

Abdulbari²,

Salleh³

et al. 2016

MAS

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Power consumption reduction investigations attracted the attention of enormous numbers of researchers in the past few decades due to its high academic and economic impacts. The pumping power losses during the transportation of crude oils are considered as one of the main power consuming applications due to the turbulent mode of transportation. Investigating the possible solutions for this problem is expensive and time consuming due to the large apparatuses needed to simulate the flow in real pipelines. Rotating disk apparatus (RDA) is an instrument mainly comprising a rotating disk and an electrical motor to rotate the disk, which was implemented as an efficient and economical path to simulate what can be done in pipelines through generating a controlled degree of turbulence. This technique was also used in many other scientific applications due to its dynamic mode of operation. For example, a rotating disk electrode was used in electrodeposition processes and to characterize deposition film thickness and uniformity. The rotating disk reactor was employed to investigate the reaction rate between fluids and solid surfaces. The present work evaluates the RDA from different prospective and applications in order to introduce it as an efficient research tools for future dynamic investigations.

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A Rotating Disk Electrode Apparatus for the Study of Fuel Cell Reactions at Elevated Temperatures and Pressures

Abstract: not Available.

Cited by 28 publications

References 0 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

Evaluation of temperature and electrolyte concentration dependent Oxygen solubility and diffusivity in phosphoric acid

Rotating Disk Apparatus: Types, Developments and Future Applications

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