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Showing 1 to 20 of 47 for “"Proton exchange membrane (PEM)"”.
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Implementation of a digital signal processing (DSP) boost inverter for fuel cell energy generation
… research is a Heliocentris “Constructor”, a 50W proton exchange membrane (PEM) fuel cell. Fuel Cells are becoming popular and are likely to be used in applications such as a backup power, portable electronic devices, independent power source generator, promising alternative fuel for vehicles and …
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Electrochemical impedance spectroscopy of proton exchange membrane fuel cell stacks
… (EIS) is applied to a small, four cell Proton Exchange Membrane (PEM) fuel cell stack to examine the stack response as the load current changes. The measured stack response is compared to a simulated response generated by a stack model that has been developed using MATLAB. The results …
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Dynamic modeling and control of a proton exchange membrane fuel cell as a distributed generator
… concentrated on the modeling and control of a Proton Exchange Membrane (PEM) fuel cell in a deregulated electric power system. The PEM fuel cell is a Multiple Input Multiple Output (MIMO) system with various dynamic states. In most previous model studies, the stack temperature of a fuel cell …
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Design and evaluation of solar and geothermal energy systems integrated with Cu-Cl cycle
… distillation (MED) desalination unit and, proton exchange membrane (PEM) electrolyzer. Systems 2 and 3 additionally consist of the copper chlorine (Cu-Cl) thermochemical hydrogen production cycle integrated with a concentrated solar power (CSP) and supercritical geothermal systems, …
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Proton Exchange Membrane Electrolysis Applied to the Dehydration of Cow Milk
… role of an electrochemical alternative method of proton exchange membrane (PEM) electrolysis in the process of concentrating milk solids. Although the thermodynamic specific energy of electrolysis at [mathematical notation] is high compared to existing thermal methods around [mathematical …
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Experimental Investigation of the Effect of Composition on the Performance and Characteristics of PEM Fuel Cell Catalyst Layers
The catalyst layer of a proton exchange membrane (PEM) fuel cell is a mixture of polymer, carbon, and platinum. The characteristics of the catalyst layer play a critical role in determining the performance of the PEM fuel cell. This research investigates the role of catalyst layer composition using …
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Investigation of the Effect of Catalyst Layer Composition on the Performance of PEM Fuel Cells
The catalyst layer of a proton exchange membrane (PEM) fuel cell is a porous mixture of polymer, carbon, and platinum. The characteristics of the catalyst layer play a critical role in determining the performance of the PEM fuel cell. In this research, sample membrane electrode assemblies (MEAs) …
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Theory of proton exchange membranes fuel cells and the testing of performance characteristics of polymer electrolyte membranes
Proton exchange membrane (PEM) fuel cells hold great promise as source of power. A hydrogen and oxygen PEM fuel is a simple fuel cell that can be theoretically characterized. The performance of a PEM fuel cell can be characterized if the contents of the two gas lines are known, the back pressure is …
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Techno-Economic Assessment of Electrolytic Hydrogen Production under Dynamic Operations
… to decarbonize many sectors of the economy. Proton Exchange Membrane (PEM) electrolysis is one of the production pathways for green hydrogen. This study uses a techno-economic optimization model that combines a high-level electrolyzer model and a cost model to evaluate the current (2021) and …
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Analysis of Ionomer-coated Carbon Nanofiber for use in PEM Fuel Cell Catalyst Layers
The typical catalyst layer structure for proton exchange membrane (PEM) fuel cells has changed little over the last two decades. A new electrode design with improved control over factors such as ionic and electrical pathways, porosity, and catalyst placement, could allow the application of less …
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The “Apparent” Diffusion Coefficient of Electrons Through a Nafion Membrane
… reduction reaction, and the durability of the proton exchange membrane (PEM). The PEM is not only used as the electrolyte for the cell but also as a physical barrier between the anode and the cathode. The integrity of this membrane is crucial to the functioning of the fuel cell. This thesis …
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Ruthenium-Chromium Oxide Aerogels Oxygen Evolution Electrocatalysts: Structure, Activity and Stability
… of generating, converting, and storing energy in proton exchange membrane (PEM) water electrolyzers. Catalysts with enhanced activity and stability are needed for the anodic oxygen evolution reaction (OER) that generate hydrogen and oxygen from water. Ruthenium-oxide based catalysts have shown the …
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A Microstructural Model for a Proton Exchange Membrane Fuel Cell Catalyst Layer
… a microstructural model of a catalyst layer in a proton exchange membrane (PEM) fuel cell. In this study, a stochastic model that uses individual carbon, platinum and ionomer particles as building blocks to construct a catalyst layer geometry, resulting in optimal porosity and material mass ratios …
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Tuning the transport properties of layer-by-layer thin films for fuel cell applications
… the devices. At the core of these devices is a proton exchange membrane (PEM) that allows rapid proton transport through the polymer matrix while preventing fuel from permeating across. Additionally, PEMs must have long-term stability in the fuel cell environment, the ability to operate over a …
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Investigation of Shorting by Penetration in Pem Fuel Cell Membranes
Electrical shorting through the proton exchange membrane (PEM) is a form of early failure commonly found in PEM fuel cells. In order to improve the durability and thus the commercial potential for PEM fuel cells, this form of failure must be understood and mitigated. This research investigates …
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Feasibility study of long-life micro fuel cell power supply for sensor networks for space and terrestrial applications
… considers the feasibility of a miniature Proton Exchange Membrane (PEM) fuel cell system coupled with battery to supply power for long life missions. The focus of this research is to prove the feasibility of long-life, self-contained power-supplies using miniature fuel cells for low-power …
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A Comparison of Two Air Compressors for PEM Fuel Cell Systems
Proton exchange membrane (PEM) fuel cells are considered one of the best potential alternative power sources for automobiles. For this application, high efficiency and high power density are required. Pressurizing the fuel cell system can give higher efficiency, higher power density and better …
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H-BN integration in III-nitride devices for green hydrogen applications
… InGaN nanopyramid photoanode with an h-BN proton exchange membrane (PEM). Additionally, the dual functionality of h-BN is highlighted—not only as a PEM to enhance device lifetime under long-term operational conditions but also as a potential system for hydrogen storage at a micro-scale …
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Modified Nafion membranes for hydrogen production in Cu-Cl thermochemical cycle
… to a water electrolysis cell and employs a membrane electrode assembly (MEA) that utilizes a proton exchange membrane (PEM). Nafion, the most widely used PEM, is permeable to cations and neutral species. Because of this, Cu can permeate the membrane and enter the cathode where it is readily …
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