High-performance long-term driving proton exchange membrane fuel cell implemented with chemically ordered Pt-based alloy catalyst at ultra-low Pt loading
Youngkwang KimHyo Eun BaeDohyeon LeeJeongwoo KimEunjik LeeSongi OhJi‐Hoon JangYong‐Hun ChoMohanraju KaruppannanYung‐Eun SungTaeho LimOh Joong Kwon
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At first, the cell structure and the operating principle of proton exchange membrane fuel cell (PEMFC) were introduced, the electrochemical modeling of PEMFC was analyzed particularly. Based on the electrochemical model, A simulation model has been developed with Matlab/Simulink. With the help of this simulation model, a series of analyses are carried out. There is an excellent agreement between the simulation results and experiments. This simulation model also adapted to the simulation of PEMFC stack. This model is capable of characterizing the transient dynamic properties of a fuel cell system, and can be readily employed in the optimization of PEMFCs installed in the practical automotive or stationary applications.
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This paper presents a complete modeling and simulation work of proton exchange membrane fuel cell (PEMFC) in PSCAD/EMTDC. The PEMFC model is established according to some concise electrochemical equations. To verify this model, the static and dynamic characteristics are investigated respectively and simulation results are discussed in detail. As a base for future work, the developed model also shows a potential to study the control system of PEMFC stack as well. Some definite conclusions referred to the operation characteristic of PEMFC are summed up in the end of this paper.
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PEM fuel cell is a clean power with a wide application prospect. The water content in proton exchange membrane plays an important role on the performance of PEM fuel cell. In this paper, Performance of PEM fuel cell with the cathode up was measured under the condition of different operating parameters. Influence of the placement of cathode up on water content in proton exchange membrane is studied. The experiment results show that when the cathode is put up, concentration over-potential of PEM fuel cell decreases; When fuel cell temperature is higher than humidification temperature, water content in membrane of PEM fuel cell with the cathode-up is more than that of PEM fuel cell with the placement of perpendicularity. Experimental results are helpful for performance optimization of PEM fuel cell and water management.
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In order to investigate the output characteristic of proton exchange membrane fuel cell (PEMFC) based on the electrical empirical, a novel dynamic model of PEMFC has been developed with Matlab/Simulink, which is distinct from the models have previously been published. By using a fuel cell test system in Fuel Cell Application Centre in Temasek Polytechnic, the transient electrical response of PEMFC was conducted and analyzed under various operating conditions. A good match is found between simulation results and experimental data. The comprehensive results of simulation manifested that the model is effective and operational. This model will be very useful to optimize the structure design, improve the operation performance, and develop the real-time control system of PEMFC.
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In a dispenser cathode the surface is composed of many small regions having different and individual values of work functions called "patches". The non-uniform emission results in a gradual transition from space-charge (SC) region to temperature limited (TL) region. The emission of a planar cathode is modeled using a 'top-hat' model. In practice, the convergent guns are incorporated with a spherical cathode. The above model is applied to a spherical cathode-anode system. This model can also be extended to a gun geometry provided that the field distribution across the cathode cross section is uniform. In this paper the performance of three types of cathode, viz. B-Type, Alloy-coated, and Scandate cathodes are studied. In the present model the real cathode is replaced by a fictitious cathode, having a maximum current density at θ = 0° and a minimum at the rim. The analysis shows that there exists an analogy between a planar cathode and a spherical cathode, enabling the emission current to be modeled in a manner similar to a planar cathode.
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Proton exchange membrane (PEM) fuel cell is a clean electrochemical device with great prospect of application. Performance plays an important role in the application of PEM fuel cell. In this paper, a voltage characteristics model of PEM fuel cell is established, its performance curves is simulated, and the influence of the operating parameters on its performance is analyzed. The results show that the simulated performance curves of PEM fuel cell and its experimental performance curves have a high degree of agreement; when the cell temperature is lower than the gas humidification temperature, the drooping extent in the high current density section of performance curve increases with the increase of the gas humidification temperatures. When the cell temperature is equal to or higher than the gas humidification temperature, the slope of the straight line section of the performance curve decreases with the increase of the gas humidification temperatures. The performance curve of the PEM fuel cell goes up with the increase of reaction gas pressure. The results are very helpful to optimization and application of PEM fuel cell.
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Mathematical modelling is essential to investigate the performance of proton exchange membrane fuel cell (PEMFC). In this paper, a system-level dynamic model of PEMFC is developed using the semi-empirical equations. The proposed model is implemented in MATLAB/SIMULINK software to simulate the dynamic characteristics of PEMFC. The dynamic response characteristics of PEMFC are conducted and analysed under multiple layers of step change in the fuel cell loads, which is defined as the input source. The research we have done suggests that is useful to improve the design and performance of PEMFC.
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PEM fuel cell model is developed in the ANSYS code. The proposed model can be used for studying the physical parameters effect on PEMFC performance. The main purpose of this study is to use a model for simulating the temperature distribution, (I-V) curve, as well as the current density distribution in the PEM fuel cell. The results showed that the performance of proton exchange membrane fuel cell (PEMFC) is improving with increasing temperature. These findings can be used to gain a better understanding of the functioning of the PEMFC system.
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