o characterize the adsorption properties of catalyst materials, proton exchange membrane and carbon paper in fuel cells using physisorption and chemisorption techniques. The test will contribute to identification of optimal catalyst compositions and surface areas for improved fuel cell performance, understanding of the physisorption and chemisorption mechanisms in fuel cell catalyst materials and Development of guidelines for the design and optimization of fuel cell.
Physisorption Analysis:
Use a gas adsorption analyzer (e.g., BET surface area analyzer) to measure the surface area and pore size distribution of the catalyst samples.Perform adsorption-desorption isotherms to determine the physisorption capacity and kinetics.Analyze the isotherms to understand the physisorption behavior of the catalyst materials.
Chemisorption analyzer
Use a chemisorption analyzer to measure the chemisorption properties of the catalyst samples. Perform temperature-programmed desorption (TPD) experiments to determine the chemisorption capacity and kinetics. Analyze the TPD data to understand the chemisorption behavior and binding energies of the catalyst materials.
Proton exchange membrane Hygroscopic performance evaluation
To assess the water uptake and retention properties of PEMs, which are essential for maintaining proton conductivity and overall fuel cell performance. There are a few procedures to realize the evaluation: Humidity Exposure:Expose the membrane samples to controlled humidity environments (e.g., 30%, 60%, 90% relative humidity).Measure the weight change of the samples to determine water uptake. Temperature Control:Place the hydrated membrane samples in a temperature-controlled chamber. Vary the temperature to simulate operating conditions (e.g., 25°C, 60°C, 80°C). Water Retention Measurement: Measure the weight of the samples at different temperatures to determine water retention. Calculate the percentage of water retained at each temperature.
Gas diffusion layer Analysis
Analyzing the gas diffusion layer (GDL) is essential for optimizing the performance of fuel cells. The GDL plays a critical role in managing water, gas distribution, and electrical conductivity. To learn membrane porosity and permeability, BSD recommend gas liquid displacement method to test pore size, pore size distribution, porosity of carbon paper; lateral gas flux of carbon paper gas diffusion layer.
