scholarly journals Ecological Performance Optimization of a High Temperature Proton Exchange Membrane Fuel Cell

Mathematics ◽  
2021 ◽  
Vol 9 (12) ◽  
pp. 1332
Author(s):  
Dongxu Li ◽  
Siwei Li ◽  
Zheshu Ma ◽  
Bing Xu ◽  
Zhanghao Lu ◽  
...  
Keyword(s):  
Energy Efficiency ◽  
High Temperature ◽  
Power Density ◽  
Proton Exchange Membrane ◽  
Operating Temperature ◽  
Proton Exchange ◽  
Maximum Power ◽  
Operating Pressure ◽  
Maximum Power Density ◽  
Exchange Membrane

According to finite-time thermodynamics, an irreversible high temperature proton exchange membrane fuel cell (HT-PEMFC) model is established, and the mathematical expressions of the output power, energy efficiency, exergy efficiency and ecological coefficient of performance (ECOP) of HT-PEMFC are deduced. The ECOP is a step forward in optimizing the relationship between power and power dissipation, which is more in line with the principle of ecology. Based on the established HT-PEMFC model, the maximum power density is obtained under different parameters that include operating temperature, operating pressure, phosphoric acid doping level and relative humidity. At the same time, the energy efficiency, exergy efficiency and ECOP corresponding to the maximum power density are acquired so as to determine the optimal value of each index under the maximum power density. The results show that the higher the operating temperature and the doping level, the better the performance of HT-PEMFC is. However, the increase of operating pressure and relative humidity has little effect on HT-PEMFC performance.

scholarly journals Finite Time Thermodynamic Optimization of an Irreversible Proton Exchange Membrane Fuel Cell for Vehicle Use

Processes ◽  
2019 ◽  
Vol 7 (7) ◽  
pp. 419 ◽  
Author(s):  
Changjie Li ◽  
Ye Liu ◽  
Bing Xu ◽  
Zheshu Ma
Keyword(s):  
Power Density ◽  
Output Power ◽  
Proton Exchange Membrane ◽  
Operating Temperature ◽  
Maximum Output Power ◽  
Proton Exchange ◽  
Maximum Output ◽  
Operating Pressure ◽  
Output Efficiency ◽  
Exchange Membrane

A finite time thermodynamic model of an irreversible proton exchange membrane fuel cell (PEMFC) for vehicle use was established considering the effects of polarization losses and leakage current. Effects of operating parameters, including operating temperature, operating pressure, proton exchange membrane water content, and proton exchange membrane thickness, on the optimal performance of the irreversible PEMFC are numerically studied in detail. When the operating temperature of the PEMFC increases, the optimal performances of PEMFC including output power density, output efficiency, ecological objective function, and ecological coefficient of performance, will be improved. Among them, the optimal ecological objective function increased by 81%. The proton film thickness has little effect on the output efficiency and the ecological of coefficient performance. The maximum output power density increased by 58% as the water content of the proton exchange membrane increased from 50% to the saturation point. The maximum output power density increases with the operating pressure.

Analysis of Voltage Losses in High Temperature Proton Exchange Membrane Fuel Cells with Properties of Membrane Materials and Fluent Software

2012 ◽  
Vol 625 ◽  
pp. 235-238 ◽  
Author(s):  
Xiao Le Yang ◽  
Yan Yin ◽  
Bin Jia ◽  
Qing Du
Keyword(s):  
Fuel Cells ◽  
High Temperature ◽  
Reasonable Agreement ◽  
Proton Exchange Membrane ◽  
Operating Temperature ◽  
Proton Exchange ◽  
Operating Pressure ◽  
Ohmic Losses ◽  
Fluent Software ◽  
Exchange Membrane

The mass and charge transport significantly affect the performance of fuel cells. A numerical model of high temperature proton exchange membrane fuel cells is developed. Ohmic losses and activation losses of both anode and cathode are analyzed at different design and operating condition. The polarization curve predicted by the model is in a reasonable agreement with published experimental data. The results of the model indicate that increasing the phosphoric acid doping level or operating temperature is helpful to decrease ohmic losses. The operating temperature has negligible impact on activation losses. Increasing the operating pressure can decrease activation losses.

scholarly journals Designing Carbon/Oxygen Ratios of Graphene Oxide Membranes for Proton Exchange Membrane Fuel Cells

2019 ◽  
Vol 2019 ◽  
pp. 1-9 ◽  
Author(s):  
Minwoo Ahn ◽  
Renlong Liu ◽  
Changgu Lee ◽  
Wonyoung Lee
Keyword(s):  
Graphene Oxide ◽  
Fuel Cells ◽  
Power Density ◽  
Proton Conductivity ◽  
Proton Exchange Membrane ◽  
Proton Exchange ◽  
Maximum Power ◽  
Maximum Power Density ◽  
Exchange Membrane ◽  
Interfacial Reactivity

Graphene oxide (GO), which is the oxidized form of graphene, has holes and functional groups on the surface and thus has high potential to be used as an electrochemical transport channel material. In this study, differently modified GO membranes are applied as electrolytes of proton exchange membrane fuel cells (PEMFCs) with controlled carbon/oxygen ratios. The critical and desired properties of the electrolyte, such as electron conductivity, proton conductivity, interfacial reactivity, and cell performance are evaluated in identical platinum-sputtered model electrodes. Among them, with the help of an increased concentration of oxygen-containing groups, a GO membrane with a low carbon/oxygen ratio shows a 2.9-fold improved maximum power density and advanced electrochemical properties compared with the pristine GO membrane. The characterization of GO suggests that the redox state of the membrane is an important factor for controlling the proton conductivity, interfacial reactivity, and maximum power density of PEMFCs.

scholarly journals Exergetic Performance Coefficient Analysis and Optimization of a High-Temperature Proton Exchange Membrane Fuel Cell

Membranes ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 70
Author(s):  
Dongxu Li ◽  
Yanju Li ◽  
Zheshu Ma ◽  
Meng Zheng ◽  
Zhanghao Lu
Keyword(s):  
Energy Efficiency ◽  
High Temperature ◽  
Fuel Cell ◽  
Power Density ◽  
Doping Level ◽  
Proton Exchange Membrane ◽  
Proton Exchange ◽  
Inlet Pressure ◽  
Exergy Destruction ◽  
Exchange Membrane

Performance of a high-temperature proton exchange membrane fuel cell (HT-PEMFC) and the influence of different parameters on HT-PEMFC is analyzed in this study. Firstly, mathematical expression for energy efficiency, power density, exergy destruction and exergetic performance coefficient (EPC) are derived. Then, the relationship between the dimensionless power density, exergy destruction rate, exergetic performance coefficient (EPC) and energy efficiency is compared. Furthermore, the effect of flow rate, doping level, inlet pressure and film thickness are considered to evaluate the performance of HT-PEMFC. Results show that EPC not only considers exergetic loss rate to minimize exergetic loss, but also considers the power density of HT-PEMFC to maximize its power density and improve its efficiency, so EPC represents a better performance criterion. In addition, increasing inlet pressure and doping level can improve EPC and energy efficiency, respectively.

Synthesis and characterization of novel imidazolium-functionalized polyimides for high temperature proton exchange membrane fuel cells

RSC Advances ◽  
2016 ◽  
Vol 6 (40) ◽  
pp. 33959-33970 ◽  
Author(s):  
Jyh-Chien Chen ◽  
Jin-An Wu ◽  
Kuei-Hsien Chen
Keyword(s):  
High Temperature ◽  
Power Density ◽  
Peak Power ◽  
Proton Exchange Membrane ◽  
Microphase Separation ◽  
Proton Exchange ◽  
Synthesis And Characterization ◽  
High Peak Power ◽  
Exchange Membrane

PEMFCs based on novel imidazolium-functionalized polyimides (ImPI-x)s demonstrate high OCVs and high peak power density with low PA uptakes. Microphase separation of ImPI-x can also be observed by AFM.

New anhydrous proton exchange membranes for high-temperature fuel cells based on PVDF–PVP blended polymers

2015 ◽  
Vol 3 (1) ◽  
pp. 148-155 ◽  
Author(s):  
Zhibin Guo ◽  
Xin Xu ◽  
Yan Xiang ◽  
Shanfu Lu ◽  
San Ping Jiang
Keyword(s):  
Fuel Cells ◽  
High Temperature ◽  
Power Density ◽  
High Power ◽  
Proton Exchange Membrane ◽  
Proton Exchange Membranes ◽  
Proton Exchange ◽  
High Power Density ◽  
Exchange Membrane ◽  
Excellent Stability

Outstanding performance in high-temperature PEMFCs: a new anhydrous proton exchange membrane based on PVDF–PVP blends showed a high power density (530 mW cm−2 at 180 °C in H2/O2) and excellent stability without external humidification.

scholarly journals Performance Analysis and Optimization of a High-Temperature PEMFC Vehicle Based on Particle Swarm Optimization Algorithm

Membranes ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 691
Author(s):  
Yanju Li ◽  
Zheshu Ma ◽  
Meng Zheng ◽  
Dongxu Li ◽  
Zhanghao Lu ◽  
...  
Keyword(s):  
Particle Swarm Optimization ◽  
High Temperature ◽  
Fuel Cell ◽  
Power Density ◽  
Proton Exchange Membrane ◽  
Particle Swarm ◽  
Proton Exchange ◽  
Swarm Optimization ◽  
Output Performance ◽  
Exchange Membrane

In this paper, a high-temperature proton exchange membrane fuel cell (HT-PEMFC) model using the polybenzimidazole membrane doped with phosphoric acid molecules is developed based on finite time thermodynamics, considering various polarization losses and losses caused by leakage current. The mathematical expressions of the output power density and efficiency of the HT-PEMFC are deduced. The reliability of the model is verified by the experimental data. The effects of operating parameters and design parameters on the output performance of the HT-PEMFC are further analyzed. The particle swarm optimization (PSO) algorithm is used for the multi-objective optimization of the power density and efficiency of the HT-PEMFC. The results show that the output performance of the optimized HT-PEMFC is improved. Then, according to the different output performance of the low-temperature proton exchange membrane fuel cell (LT-PEMFC), HT-PEMFC, and optimized HT-PEMFC, different design schemes are provided for a fuel cell vehicle (FCV) powertrain. Simulation tests are conducted under different driving cycles, and the results show that the FCV with the optimized HT-PEMFC is more efficient and consumes less hydrogen.

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