Effects of cathode gas diffusion layer type and membrane electrode assembly preparation on the performance of immobilized glucose oxidase‐based enzyme fuel cell

2021 ◽  
Author(s):  
Mehmet Suha Yazici ◽  
Tahsin Bahar
Keyword(s):  
Fuel Cell ◽  
Glucose Oxidase ◽  
Diffusion Layer ◽  
Gas Diffusion Layer ◽  
Membrane Electrode Assembly ◽  
Gas Diffusion ◽  
Membrane Electrode ◽  
Immobilized Glucose Oxidase

Gas diffusion layer/flow-field unified membrane-electrode assembly in fuel cell using graphene foam

2019 ◽  
Vol 323 ◽  
pp. 134808 ◽  
Author(s):  
Ji Eun Park ◽  
Jongkoo Lim ◽  
Myung Su Lim ◽  
Sungjun Kim ◽  
Ok-Hee Kim ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Flow Field ◽  
Diffusion Layer ◽  
Gas Diffusion Layer ◽  
Membrane Electrode Assembly ◽  
Gas Diffusion ◽  
Membrane Electrode ◽  
Graphene Foam ◽  
Layer Flow

scholarly journals Collaborative Design for Uneven Physical Structures of Multi-Layers in PEMFC

2021 ◽  
Vol 12 (3) ◽  
pp. 148
Author(s):  
Qinwen Yang ◽  
Shujun Chen ◽  
Gang Xiao ◽  
Lexi Li
Keyword(s):  
Fuel Cell ◽  
Diffusion Layer ◽  
Collaborative Design ◽  
Catalyst Layer ◽  
Gas Diffusion Layer ◽  
Membrane Electrode Assembly ◽  
Gas Diffusion ◽  
Cell Performance ◽  
Membrane Electrode ◽  
Fuel Cell Performance

A collaborative design for the uneven distributions of a flow channel, gas diffusion layer porosity and catalyst layer porosity are newly proposed to improve the utilization ratio of the membrane electrode assembly of the proton exchange membrane fuel cell. The effects of the uneven design of the rib width and of the uneven porosity parameters of the cathode and anode gas diffusion layer and catalyst layer on the fuel cell performance were studied in detail. Numerical simulations were designed and implemented for validation. The results show that the fuel cell performance could be improved through the collaborative design of uneven distributions for different layers. The rib width gradually decreasing and the porosity of the cathode gas diffusion layer and the cathode catalyst layer gradually increasing along the fluid flow direction would contribute to a better design compared to the regular even design. The new uneven design can make the fuel penetrate into the catalyst layer in time to participate in the reaction, improve the utilization rate of the membrane electrode assembly, and greatly improve the performance of the fuel cell.

Time-Resolved Water Measurement in a PEM Fuel Cell Using High-Resolution Neutron Imaging Technique

2010 ◽  
Vol 7 (5) ◽  
Author(s):  
P. Quan ◽  
M.-C. Lai ◽  
D. S. Hussey ◽  
D. L. Jacobson ◽  
A. Kumar ◽  
...  
Keyword(s):  
Fuel Cell ◽  
High Resolution ◽  
Diffusion Layer ◽  
Gas Diffusion Layer ◽  
Gas Diffusion ◽  
Proton Exchange ◽  
Neutron Imaging ◽  
Dew Point ◽  
Membrane Electrode ◽  
Water Measurement

The dynamic process of water transport along the through-plane direction in the membrane electrode assembly of a proton exchange membrane fuel cell was investigated using the high-resolution neutron imaging. Four different membrane/gas diffusion layer or membrane/gas diffusion electrode assemblies were tested by measuring the through-plane water thickness profiles. The results indicate that proper design and assembly of the test fixture are critical for accurate water measurement; the accumulation speed of liquid water inside an assembly varies with time; the ionomer in catalyst layers could facilitate water management in the membrane; the time constants for wetting and drying processes are functions of gas diffusion layer thickness, inlet flow rate, and gas dew point; and the time constant for the wetting process is about 1.4 times longer than the corresponding drying process.

Three-dimensional graphene as gas diffusion layer for micro direct methanol fuel cell

2018 ◽  
Vol 32 (12) ◽  
pp. 1850145 ◽  
Author(s):  
Yingli Zhu ◽  
Xiaojian Zhang ◽  
Jianyu Li ◽  
Gary Qi
Keyword(s):  
Fuel Cell ◽  
Diffusion Layer ◽  
Direct Methanol Fuel Cell ◽  
Three Dimensional ◽  
Gas Diffusion Layer ◽  
Gas Diffusion ◽  
Membrane Electrode ◽  
Transfer Resistance ◽  
Direct Methanol ◽  
Methanol Fuel Cell

The gas diffusion layer (GDL), as an important structure of the membrane electrode assembly (MEA) of the direct methanol fuel cell (DMFC), provides a support layer for the catalyst and the fuel and the product channel. Traditionally, the material of GDL is generally carbon paper (CP). In this paper, a new material, namely three-dimensional graphene (3DG) is used as GDL for micro DMFC. The experimental results reveal that the performance of the DMFC has been improved significantly by application of 3DG. The peak powers increase from 25 mW to 31.2 mW and 32 mW by using 3DG as the anode and cathode GDL instead of CP, respectively. The reason may be the decrease of charge and mass transfer resistance of the cell. This means that the unique 3D porous architecture of the 3DG can provide lower contact resistance and sufficient fuel diffusion paths. The output performance of the cell will be further improved when porous metal current collectors is used.

Roll-to-roll stack and lamination of gas diffusion layer in multilayer structured membrane electrode assembly

2019 ◽  
Vol 234 (1-2) ◽  
pp. 66-74
Author(s):  
Jiankui Chen ◽  
Xi Jiang ◽  
Wei Tang ◽  
Liang Ma ◽  
Yiqun Li ◽  
...  
Keyword(s):  
Diffusion Layer ◽  
Proton Exchange Membrane ◽  
Gas Diffusion Layer ◽  
Membrane Electrode Assembly ◽  
Gas Diffusion ◽  
Proton Exchange ◽  
Membrane Electrode ◽  
Roll To Roll ◽  
Multilayer Membrane ◽  
Exchange Membrane

A membrane electrode assembly is the core component of a proton-exchange membrane fuel cell stack. It consists of multilayer structured membranes which are flexible, heterogeneous and have variable cross section. To improve the efficiency of membrane electrode assembly processing and manufacturing, a roll-to-roll system with gas diffusion layer is designed. By peeling the protective membrane and the upper and lower gas diffusion layers’ hot-pressing, proton-exchange membrane is manufactured into a five-layer catalyst-coated membrane. Then, the catalyst-coated membrane is manufactured into membrane electrode assembly by multilayer membrane breakpoint die-cutting and laying-off. The system integrates multiple key technologies, including roll-to-roll precise feeding, gas diffusion layer multi-degree accurate operation and multichannel temperature control, to realize the precise positioning of flexible multilayer membrane and brittle gas diffusion layer. The tension inhomogeneity and critical wrinkling tension are modeled for web traveling in the continuous roll-to-roll manufacturing equipment. The proposed roll-to-roll stack and lamination system effectively combines discontinuous hot-pressing, die-cutting, laying-off technics to realize the high-efficiency manufacturing of membrane electrode assembly.

Effects of Assembly Pressure on the Gas Diffusion Layer and Performance of a PEM Fuel Cell

2011 ◽  
Vol 110-116 ◽  
pp. 48-52 ◽  
Author(s):  
Hao Ming Chang ◽  
Min Hsing Chang
Keyword(s):  
Fuel Cell ◽  
Diffusion Layer ◽  
Gas Permeability ◽  
Gas Diffusion Layer ◽  
Pem Fuel Cell ◽  
Gas Diffusion ◽  
Cell Performance ◽  
Carbon Paper ◽  
Membrane Electrode ◽  
Clamping Pressure

Assembly pressure plays an important role in the factors affecting the performance of a PEM fuel cell. An insufficient clamping pressure may cause large contact resistance and thus lower the cell performance. On the other hand, over-clamping may reduce the porosity and permeability of the gas diffusion layer (GDL) and also result in poor cell performance. Therefore, it is very important to determine the proper assembly pressure for obtaining optimal performance. In this study, we design a special test fixture to evaluate the effect of assembly pressure on the performance of a PEM fuel cell. Without disassembling the fuel cell, the clamping pressure can be adjusted in situ to measure the cell performance directly and precisely. The unique single cell design eliminates the influence of gasket around the membrane electrode assembly (MEA) and makes it possible to estimate the compression effect of GDL independently. Three different types of carbon paper are used in the experiments as the GDLs. The variations of water contact angle, gas permeability, and in-plane electrical resistivity with the assembly pressure are also measured to explore the effects of assembly pressure on these physical properties. The results show that an optimal assembly pressure is always observed in each case, indicating an adequate compression on GDL is quite necessary for fuel cells.

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