Temperature and Humidity Susceptibility of Instrumentation Components
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32nd Space Simulation Conference Conference Procee↗
Engineering topics
Lujan, Roger W.
Publications and source records attributed to Lujan, Roger W..
CSTT Update: Fuel Quality Analyzer
These are slides from a presentation. The following topics are covered: project background (scope and approach), developing the prototype (timeline), update on intellectual property, analyzer comparisons (improving humidification, stabilizing the baseline, applying clean-up strategy, impact of ionomer content and improving clean-up), proposed operating mode, considerations for testing in real-world conditions (Gen 1 analyzer electronics development, testing partner identified, field trial planning), summary, and future work.
47 OTHER INSTRUMENTATION↗
Recent advances in HC/NO x /NH 3 mixed-potential sensors for engine applications: testing by National Labs, OEM, and Tier-1 suppliers
This report is a presentation by the Advanced Engine Combustion Tech Team. They discuss how to evaluate and test the performance of engine applications.
42 ENGINEERING↗
Codes & Standards Tech Team Update: Fuel Quality Analyzer [Slides]
The development of a device to measure impurities in the fuel stream would be useful to the fuel cell community, hydrogen fueling stations and suppliers.
08 HYDROGEN↗
Durability of Polymer Electrolyte Membrane Fuel Cells Operated at Subfreezing Temperatures
The structure, composition, and interfaces of membrane electrode assemblies (MEA) and gas-diffusion layers (GDLs) have a significant effect on the performance of single-proton-exchange-membrane (PEM) fuel cells operated isothermally at subfreezing temperatures. During isothermal constant-current operation at subfreezing temperatures, water forming at the cathode initially hydrates the membrane, then forms ice in the catalyst layer and/or GDL. This ice formation results in a gradual decay in voltage. High-frequency resistance initially decreases due to an increase in membrane water content and then increases over time as the contact resistance increases. The water/ice holding capacity of a fuel cell decreases with decreasing subfreezing temperature (-10°C vs. -20°C vs. -30°C) and increasing current density (0.02 A cm -2 vs. 0.04 A cm -2 ). Ice formation monitored using in-situ high-resolution neutron radiography indicated that the ice was concentrated near the cathode catalyst layer at low operating temperatures (≈-20°C) and high current densities (0.04 A cm -2 ). Significant ice formation was also observed in the GDLs at higher subfreezing temperatures (≈-10°C) and lower current densities (0.02 A cm -2 ). These results are in good agreement with the long-term durability observations that show more severe degradation at lower temperatures (-20°C and -30°C).
30 DIRECT ENERGY CONVERSION↗
Solid State Electrochemical Sensor R&D
This document presents designs of electrochemical sensors for materials synthesis and integrated devices.
42 ENGINEERING↗
Development of Accelerated Stress Tests For Polymer Electrolyte Membrane Fuel Cells
Abstract Not Provided
Direct Energy Conversion(30)↗
Durability Improvements Through Degradation Mechanism Studies
The durability of polymer electrolyte membrane (PEM) fuel cells is a major barrier to the commercialization of these systems for stationary and transportation power applications. By investigating cell component degradation modes and defining the fundamental degradation mechanisms of components and component interactions, new materials can be designed to improve durability. To achieve a deeper understanding of PEM fuel cell durability and component degradation mechanisms, we utilize a multi-institutional and multi-disciplinary team with significant experience investigating these phenomena.
08 HYDROGEN↗