Investigation of Hydrogen Oxidation and Evolution Reactions at Porous Pt/C Electrodes in Nafion-Based Membrane Electrode Assemblies Using Impedance Spectroscopy and Distribution of Relaxation Times Analysis

2021 ◽  
Author(s):  
Patrick K. Giesbrecht ◽  
Michael S. Freund
Keyword(s):  
Impedance Spectroscopy ◽  
Hydrogen Oxidation ◽  
Relaxation Times ◽  
Membrane Electrode ◽  
Membrane Electrode Assemblies ◽  
Electrode Assemblies

Development of Production Technology for Membrane-Electrode Assemblies With Radical Capturing Layer

2013 ◽  
Vol 10 (1) ◽  
Author(s):  
Toshiro Kobayashi ◽  
Etsuro Hirai ◽  
Hideki Itou ◽  
Takuya Moriga
Keyword(s):  
Production Technology ◽  
Mass Production ◽  
Catalyst Layer ◽  
Gas Diffusion ◽  
Membrane Electrode ◽  
Continuous Formation ◽  
Forming Technology ◽  
Membrane Electrode Assemblies ◽  
Electrode Assemblies ◽  
Opening Ratio

This paper describes the development of mass-production technology for membrane-electrode assemblies (MEA) with a radical capturing layer and verifies its performance. Some of the authors of this paper previously developed an MEA with a radical capturing layer along the boundaries between the electrode catalyst layer and the polymer membrane to realize an endurance time of 20,000 h in accelerated daily start and daily stop (DSS) deterioration tests. Commercialization of these MEAs requires a production technology that suits mass production lines and provides reasonable cost performance. After developing a water-based slurry and selecting a gas diffusion layer (GDL), a catalyst layer forming technology uses a rotary screen method for electrode formation. Studies confirmed continuous formation of the catalyst layer, obtaining an anode/cathode thickness of 55 μm (+10/−20)/50 μm (+10/−20) by optimizing the opening ratio and thickness of the screen plate. A layer-forming technology developed for the radical capturing layer uses a two-fluid spraying method. Continuous formation of an 8 μm thick (±3 μm) radical capturing layer proved feasible by determining the appropriate slurry viscosity, spray head selection, and optimization of spraying conditions.

Effect of Humidifier Temperatures on Nafion-XL Membrane Electrode Assemblies (MEA) – An Experimental Study

2018 ◽  
Vol 5 (1) ◽  
pp. 765-771
Author(s):  
G. Vasu ◽  
B. Sreenivasulu ◽  
G.V.S. Sarma ◽  
D. Arjun ◽  
B. Anusha ◽  
...  
Keyword(s):  
Experimental Study ◽  
Membrane Electrode ◽  
Membrane Electrode Assemblies ◽  
Electrode Assemblies
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