Effect of Gas Flow Velocity in the Channels of Consumption Reactants in a Fuel Cell Type (PEMFC)

Zeroual, M.; Moussa, Hocine Ben; Monsaf, Tamerabet

doi:10.1016/j.egypro.2012.05.043

Cited by 14 publications

(5 citation statements)

References 12 publications

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“…22 Therefore, the density of the triple phases and the utilization of hydrogen fuel will determine the generating performance and unit cost of the power supply of the fuel cell. According to the literature, reducing the rate of gas flow or using the baffle plate and obstacle to control the gas transmission can improve the utilization of hydrogen fuel and improve the cell performance, 23,24 which can be attributed to the increase of probability of the reactive gas to touch the triplephase site. On the basis of the above theory, one conceptually simple method for achieving this goal is to produce the fuel gas generated in the triple-phase site of an electrode via photocatalytic water splitting.…”

mentioning

confidence: 99%

Mixed-Phase Manganese Dioxide and Functionalized Graphite Supported Platinum/Manganese Dioxide Catalyst for Light-Driven Photoelectrochemical Cell

Pai¹,

Tsai²,

Kao³

2014

J. Electrochem. Soc.

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This study investigates the feasibility of using a mixed phase manganese dioxide (MnO 2 ) in the graphite supported Pt catalyst layer to perform a light-driven photoelectrochemical cell. The effects of the conditions of preparing a mixed phase MnO 2 on their properties are evaluated. By adjusting the precursor concentrations down to 0.1 M, the multi-diffraction peaks of α−, β−, ε− and γ−MnO 2 can be obtained and shown to display strong vibrational bands related to the pyrolusite and ramsdellite structure. In particular, a significant enhancement on the photodegradation test has been observed with an optimum degradation efficiency ratio (monomeric/dimeric) of 1.089. Furthermore, by adding a mixed phase MnO 2 in the catalyst layer, the electrode shows the related hydrophilic surface characteristics, and the advancing contact angle, receding contact angle and contact angle decrease to 121.91 • , 117.77 • and 106.64 • , respectively. After light illumination, a significant light-induced hydrogen generation by CH 3 OH aqueous solution splitting is observed. The incorporation of mixed phase MnO 2 within graphite supported Pt catalyst layer largely enhances the photoelectrochemical cell performance from 2.18 mW cm −2 to 2.92 mW cm −2 . The use of solar-induced photocatalytic reactions to conduct water splitting to produce hydrogen is currently one of the world's most important alternative energy technologies being developed. In addition to reducing mankind's demand for fossil fuels, the hydrogen energy can also convert solar energy into another form of energy and be stored. According to the literature, the photocatalytic water-splitting reaction system can be divided into tri-electrodes and bi-electrodes; 1 the three-pole electrode system consists of a semiconductor photoanode, platinum counter electrode and reference electrode. The process of the photocatalytic reaction must be subject to an additional bias voltage for it to be carried out. However, the electron-transfer kinetics and cell/electrolyte resistance limit the efficiency of H 2 generation in such cells. In contrast, the membrane electrode assembly as the main structure of the bi-electrodes photoelectrochemical cell could be started without additional bias. It needs only the light to be irradiated on the photoelectrode end, taking advantage of the semiconductor materials on the photoelectrode surface to absorb the photon energy and, thus, stimulate the electron-hole pairs, so the water-splitting reaction could be started. 2-5 Nevertheless, when energy level of the H 2 /H 2 O redox reaction is higher than the Fermi-energy of the cathode electrode, an applied bias is still necessary for a two electrode configuration cell. 6 The key to producing hydrogen from photocatalytic water-splitting lies in the photocatalytic material. The energy of the electron-holes that are generated through the photocatalytic material being stimulated must be identical to the electric potential of the oxidation-reduction reaction. Only then can the oxidation-reduction reaction start t...

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mentioning

confidence: 99%

Mixed-Phase Manganese Dioxide and Functionalized Graphite Supported Platinum/Manganese Dioxide Catalyst for Light-Driven Photoelectrochemical Cell

Pai¹,

Tsai²,

Kao³

2014

J. Electrochem. Soc.

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“…The amount of air supplied to the cathode of the single cell was ensured by a compressor, its flow and pressure being controlled by means of the pressure regulator, but also of the flow regulator integrated in the test stand [7]. The thermal management system of the fuel cells is also a key element of the test installations, a fuel cell not being able to function optimally, safely and for a long time, without a proper thermal control.…”

Section: Experimental Determinationsmentioning

confidence: 99%

The identification of optimal operating parameters under high energy efficiency conditions for a single polymer electrolyte membrane (PEM) fuel cell

Bratu

Ene

Vulpe

et al. 2022

IOP Conf. Ser.: Earth Environ. Sci.

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The performance of PEM fuel cells is influenced by several factors such as: the operating temperature of the cell, the reactant gas flow, work pressures, the reaction gas humidity. In the present work we aimed to identify the optimal values of these parameters for operation of a PEM cell to achieve maximum power in conditions of high efficiency; the technological possibilities of its use in a portable energy application have been evaluated. Experimental measurements regarding the integrating polymeric membrane in three different fuel cell construction designed were performed. The influence of the mechanical compression of the GDL diffusion layer on the total internal resistance of the cell was achieved by comparative analysis of the polarization curves. It was found that as the deformation level of the MEA increases, the power generated by the battery increases progressively. The resulting experimental data subsequently allowed the design and implementation of a PEM fuel cell assembly, fully functional at power level, corresponding to the number of constituent elements.

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“…An isothermal and steady‐state simulation condition is considered in this experiment. Due to simplifying the calculation, the mathematical model adopted the following assumptions [18–19]. The reactants are ideal gases and incompressible. There is no phase change in the reaction system (only the gas phase). The gas flow in the flow channel is laminar. The effects of gravity are ignored. Multicomponent diffusion is considered in the model. Only contact resistances of GDL and Current Collector are considered in the cell. GDL, catalyst layer, and membrane are homogeneous. …”

Section: Computation Domainmentioning

confidence: 99%

“…Zeroual et al. [18] found that the placement of obstacles would lead to an increase in reactant consumption. These periodically placing of blocks can induce forced convection more effectively.…”

Section: Introductionmentioning

confidence: 99%

Research about two‐step channel with lateral narrowing structures in the flow mass transfer of proton exchange membrane fuel cell

Wang

Lin

et al. 2022

Fuel Cells

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Proton exchange membrane fuel cell (PEMFC) is a new energy device with wide application prospects. The design of its flow field is one of the effective methods to improve its performance. As key parameters of the PEMFC, mass transport is directly dependent on these channels in flow fields. To enhance the mass transport in the channel, some simple two‐step structures with forced convection are proposed in previous research. But the convections formed by these simple structures are only in one direction. Compared to the complex flow behaviors of the gas in PEMFC, these one‐direction convections are not enough. Then the more comprehensive dimensional convections are made by a new kind of two‐step structure with lateral narrowing. The mathematical model of the new‐designed PEMFC is simulated by the Fluent module in the computational fluid dynamics software ANSYS. Compared with the parallel‐straight‐flow channel, the current density of the new channel proposed in this paper can be increased by 12.5%.

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Effect of Gas Flow Velocity in the Channels of Consumption Reactants in a Fuel Cell Type (PEMFC)

Cited by 14 publications

References 12 publications

Mixed-Phase Manganese Dioxide and Functionalized Graphite Supported Platinum/Manganese Dioxide Catalyst for Light-Driven Photoelectrochemical Cell

Mixed-Phase Manganese Dioxide and Functionalized Graphite Supported Platinum/Manganese Dioxide Catalyst for Light-Driven Photoelectrochemical Cell

The identification of optimal operating parameters under high energy efficiency conditions for a single polymer electrolyte membrane (PEM) fuel cell

Research about two‐step channel with lateral narrowing structures in the flow mass transfer of proton exchange membrane fuel cell

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