scholarly journals Research on the Influence of Collector Microstructure on the Performance of PEM Electrolyzer

2021 ◽  
Vol 12 (4) ◽  
pp. 165
Author(s):  
Wenxuan Ji ◽  
Sen Wang ◽  
Yongwen Sun ◽  
Hong Lv ◽  
Xiaojun Shen ◽  
...  
Keyword(s):  
Electrochemical Impedance ◽  
Membrane Electrode Assembly ◽  
Porous Titanium ◽  
Membrane Electrode ◽  
Titanium Plate ◽  
Battery Voltage ◽  
Median Diameter ◽  
Pem Electrolyzer ◽  
Different Diameters ◽  
Coated Membrane

The membrane electrode assembly was prepared by a catalyst coated membrane (CCM) with an effective active area of 10 × 10 cm2 in this work. Porous titanium plates with different diameters were used as anode collectors to study the polarization curve and electrochemical impedance spectroscopy (EIS) of the electrolyzer. The results show that the pore size of a porous titanium plate on the anode side has a significant effect on the performance of the electrolyzer. The best cell performance was obtained when the median diameter of the anode titanium plate was 12.3 um. When the current density is 1 A/cm2, the battery voltage is 2.253 V.

A completely slot die coated membrane electrode assembly

2019 ◽  
Vol 44 (14) ◽  
pp. 7053-7058 ◽  
Author(s):  
Markus Stähler ◽  
Andrea Stähler ◽  
Fabian Scheepers ◽  
Marcelo Carmo ◽  
Detlef Stolten
Keyword(s):  
Membrane Electrode Assembly ◽  
Membrane Electrode ◽  
Slot Die ◽  
Coated Membrane

Impedance-based Performance Analysis of Micropatterned Polymer Electrolyte Membrane Fuel Cells

2021 ◽  
pp. 1-33
Author(s):  
Morio Tomizawa ◽  
Keisuke Nagato ◽  
Kohei Nagai ◽  
Akihisa Tanaka ◽  
Marcel Heinzmann ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Polymer Electrolyte ◽  
Electrochemical Impedance ◽  
Catalyst Layer ◽  
Membrane Electrode Assembly ◽  
Gas Diffusion ◽  
Reduction Reaction ◽  
Proton Exchange ◽  
Operating Conditions ◽  
Membrane Electrode

Abstract Micropatterns applied to proton exchange membranes can improve the performance of polymer electrolyte fuel cells; however, the mechanism underlying this improvement is yet to be clarified. In this study, a patterned membrane electrode assembly (MEA) was compared with a flat one using electrochemical impedance spectroscopy and distribution of relaxation time analysis. The micropattern positively affects the oxygen reduction reaction by increasing the reaction area. However, simultaneously, the pattern negatively affects the gas diffusion because it lengthens the average oxygen transport path through the catalyst layer. In addition, the patterned MEA is more vulnerable to flooding, but performs better than the flat MEA in low-humidity conditions. Therefore, the composition, geometry, and operating conditions of the micropatterned MEA should be comprehensively optimized to achieve optimal performance.

A completely spray-coated membrane electrode assembly

2016 ◽  
Vol 70 ◽  
pp. 65-68 ◽  
Author(s):  
Matthias Klingele ◽  
Benjamin Britton ◽  
Matthias Breitwieser ◽  
Severin Vierrath ◽  
Roland Zengerle ◽  
...  
Keyword(s):  
Membrane Electrode Assembly ◽  
Membrane Electrode ◽  
Coated Membrane

Fabrication of Support Tubular Proton Exchange Membrane For Fuel Cell

2006 ◽  
Vol 4 (4) ◽  
pp. 520-524 ◽  
Author(s):  
Ru-Jun Yu ◽  
Guang-Yi Cao ◽  
Xiu-Qing Liu ◽  
Zhong-Fang Li ◽  
Wei Xing ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Power Density ◽  
Proton Exchange Membrane ◽  
Electrochemical Impedance ◽  
Porous Silica ◽  
Membrane Electrode Assembly ◽  
Proton Exchange ◽  
Membrane Electrode ◽  
Direct Methanol ◽  
Exchange Membrane

The support tubular proton exchange membranes (STPEMs) were fabricated successfully by impregnating porous silica pipe into a solution of perfluorinated resin. The structures of the inner, outer, and cross section of support PEM tube were characterized intensively by scanning electron microscopy observation. In addition, the conductivity and impermeability were measured by electrochemical impedance spectroscopy (EIS) and the bubble method, respectively. Results show that the conductivity of the PEM can reach as low as 1.46S∕m when using the silica pipe of 0.7mm wall thickness. Subsequently, the ST membrane electrode assembly for direct methanol fuel cell (DMFC) and proton exchange membrane fuel cell (PEMFC) applications was prepared first by loading Pt∕C and Pt–Ru∕C catalyst ink onto the outer and inner surfaces of the PEM tube, respectively. The performances of the tubular DMFC and the PEMFC were tested on a self-made apparatus, which shows that the power density of tubular DMFC can reach 10mWcm−2 when 4molL−1 methanol solution flows through the anode at 80°C, and that the power density of tubular PEMFC can reach up to 60mWcm−2 when hydrogen flows at the rates of 20mlmin−1 through the anode at 60°C, both the cathodes adopting air-breathing mode.

An Impedance Study on the sPEEK/ZrO2 Membranes for Direct Methanol Fuel Cell Applications

2008 ◽  
Vol 587-588 ◽  
pp. 926-930 ◽  
Author(s):  
V.B. Silva ◽  
V.S. Silva ◽  
L.M. Madeira ◽  
Suzana Pereira Nunes ◽  
A. Mendes
Keyword(s):  
Proton Conductivity ◽  
Electrochemical Impedance ◽  
Membrane Electrode Assembly ◽  
Membrane Electrode ◽  
Zro2 Content ◽  
Poly Ether Ether Ketone ◽  
Direct Methanol ◽  
Diffusion Phenomena ◽  
Inorganic Content ◽  
Temperature Ranges

Electrochemical impedance experiments were carried out in order to study the influence of the ZrO2 inorganic incorporation on the proton conductivity of sulfonated poly(ether ether ketone) (sPEEK) membranes. The impedance data was fitted to an extension of Randles’ circuit, within the inorganic content and temperature ranges considered. The model fits quite well for ZrO2 loads up to 10 wt.%. Such a model allows for characterizing the diffusion phenomena (Warburg) of the membrane electrode assembly (MEA), membrane and electrodes resistances, capacitive and inductive behavior. Proton conductivity was obtained from the impedance spectra and it was observed that it increases with temperature and decreases with the inorganic content. As a general trend, the Warburg parameter decreases slightly with the temperature, except for the 5 wt. % ZrO2 membrane that suffers a more pronounced influence. The Warburg parameter also decreases with the ZrO2 content.

The influence of membrane electrode assembly’s pressing on PEM fuel cell’s performance

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Federico Perdomo ◽  
Matilde Abboud ◽  
Erika Teliz ◽  
Fernando Zinola ◽  
Verónica Díaz
Keyword(s):  
Electrochemical Impedance ◽  
Linear Sweep Voltammetry ◽  
Membrane Electrode Assembly ◽  
Charge Transfer Resistance ◽  
Open Circuit ◽  
Polymeric Membrane ◽  
Membrane Electrode ◽  
Transfer Resistance ◽  
Supported Platinum Catalysts ◽  
Different Temperatures

Abstract The performance of a fuel cell depends on multiple factors, one of the most important being the preparation of the membrane electrode assembly (MEA). In the present work, MEAs constituted by gas diffuser electrodes (GDE) were pressed with carbon supported platinum catalysts. As solid electrolyte, a commercial polymeric membrane from Nafion was used, which was pressed at two GDE with loads of 5 and 1.5 mg/cm2 of catalyst at different temperatures and pressures for a fixed period of time. The assembly was characterized electrochemically using linear sweep voltammetry and electrochemical impedance spectroscopy at three different potentials. Also, the behavior when reversing the supply of hydrogen and oxygen to the GDE was studied. The results of the study showed a great dependence of the charge transfer resistance with the temperature, being secondary the dependence with the pressure in the range of temperature and pressure analyzed. Likewise, changes were observed in the open circuit potential after varying the temperature, pressure and catalyst load, hence affecting its maximum power and efficiency at that point.

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