Proton Exchange Membrane Fuel Cell — Simulation & Power Modeling

Abstract — Proton Exchange Membrane Fuel Cell

Fuel Cell (PEMFC), assembling it, constructing the cell, and then testing it under different operating conditions of temperature, relative humidity, type of reactant gases (air vs. oxygen), and flow rate of reactant gases into the cell. At the fabrication phase, the materials used, their quantities, as well as the detailed steps required to fabricate each layer are clarified in detail. In the testing and evaluation phase, the fabricated cell is connected to a test station, and all operating conditions are controlled; then voltage, current, and output power are measured. Through this experiment, it can be concluded that the best performance of PEMFC can be obtained when reaching the required loading of the coating materials on the different layers, as well as when distributed regularly on the substrate. As for the operating conditions, there is an improvement in the cell performance when raising temperatures and when it is operated at values of relative humidity between 80% and 100% and when oxygen flows instead of air as an oxidant in the reaction which occurs inside the cell.

Analytical & State-Space Control Methodology

The world has recently witnessed a significant increase in the percentage of electricity generated from renewable energy sources, as the latest statistics announced by the US Energy Information Administration (EIA) state that the global electricity capacity reached 9,080 GW in 2023, of which 3,833 GW are from renewable energy sources such as solar, wind and hydropower. These statistics also show that the total global electricity generation in the same year reached 29,124 TWh, of which 9,004 TWh are from renewable energy sources 1 . Due to the interest of all countries in increasing the contribution of renewable energy sources and the diversity of their types, interest in Hydrogen energy and Proton Exchange Membrane Fuel Cells (PEMFCs) has emerged as one of the technologies used in this field. This cell converts chemical energy into electrical energy through the chemical reaction between hydrogen and oxygen. It is a clean electrochemical energy conversion device that produces only water and heat without air pollutants. Transportation and portable power applications are common applications in which this type of fuel cell is used due to its compact size and high power density 2 , 3 , 4 . One of the features of this cell is the low operating temperature, as it operates at temperatures ranging between 60 °C and 100 °C, which leads to rapid start-up, although this leads to an increase in the sensitivity of the catalyst layer in the cell to the impurities in the operating fuel, such as carbon monoxide (CO), as it may lead to poisoning the platinum-based catalyst 2 , 5 . The life span of this cell may vary according to the type of application used, reaching 30,000 h in the case of stationary applications and up to 2500–3000 h in the case of automotive applications 6 . In this study, the fabrication of different layers of the cell and their Figure 1: Power Converter Circuit Schematic & Electrical Interfacing for Proton Exchange Membrane Fuel Cell One of the main components of PEMFCs is the Membrane Electrode Assembly (MEA), which is a proton-conducting membrane that is covered by catalyst layers – Catalyst Coated Membrane (CCM), followed by gas diffusion layers (GDLs). It determines the performance and durability of the cell 7 . The function of MEA is to efficiently transport the protons from one electrode to another, distribute the gases within the cell, and regulate water management. It must be fabricated and assembled appropriately for optimal performance under different operating conditions 8 , 9 . The fabrication process of MEA has witnessed great development and new technologies recently 10 , 11 . Among the most famous fabrication methods are hot pressing, spray coating, and electrospinning, as it ensures uniform distribution of materials on the substrate and strong adhesion to them and reduces internal resistance 2 . Research has also focused on the cost of catalyst fabrication while maintaining high cell performance by using lower-cost materials in fabrication such as Sulfonated Poly (Ether Ether Ketone) (SPEEK) instead of Nafion 12 . GDL is an essential layer in MEA as it helps to diffuse reactant gases and remove water resulting from the reaction while maintaining the mechanical stability of the cell. PUREBLACK carbon is used to fabricate GDL in reference 13 ; its first experimental use was in lithium-ion batteries 14 . The use of PUREBLACK carbon improves the performance of the cell when operating under different levels of humidity as it is characterized by a partly graphitized core shell, and its porosities are uniform and graded 15 , 16 . The development of MEA fabrication is discussed, and different methods and technologies are reviewed in 17 to achieve the highest efficiency and longest cell life span. The design and material of the flow fields in the plates that represent electrodes have an active role in the performance of the cell 18 , 19 . The study in reference 20 proves that cell performance improves when using Optimized Multi-Parallel Serpentine Flow Fields instead of Conventional Flow Fields, as it leads to better water management and more uniform current density distribution.

Simulink Waveforms & Power Quality Findings

The experimental study in reference 21 is concerned with the effect of operating conditions on cell performance and reviews the polarization curves of a 30-cell stack which relies on cells with a membrane of Nafion-212. Recent studies have focused on catalyst improvement, reducing the loading of the materials used in MEA fabrication, flow field design optimization, or membrane conductivity enhancement, focusing on a single variable change. However, most of these studies depend on commercial components existing in the market or modelling and simulation of the tested cell.

Scope & Practical Applications

• High-efficiency DC-DC converters and isolated resonant topologies (LLC / DAB)
• Sinusoidal and Space Vector PWM inverters for grid integration & industrial motor drives
• MOSFET / IGBT gate driver optimization with active Miller-clamp shoot-through protection
• Power quality conditioning with Total Harmonic Distortion (THD) strictly compliant with IEEE 519
• Complete Simscape .SLX model files, parameter calculation scripts, and IEEE dissertation reports