Elucidating the Mass Transportation Behavior of Gas Diffusion Layers via a H2 Limiting Current Test
Abstract
:1. Introduction
2. Experimental Section
2.1. Materials
2.2. MEA Fabrication and Cell Assembly
2.3. Limiting Current Tests
2.4. Experimental Design to Test the Mass Transport Resistance of GDL
2.5. Structure Characterizations
3. Results and Discussions
3.1. The Mass Transport Resistance of T060
3.2. Structure Characterizations
3.3. The Mass Transport Resistance of SGL-29BC and F91
3.4. Comparison of Mass Transfer Resistance in GDLs
4. Conclusions
- (1)
- The influence of humidity on the transport resistance of H2 in the GDL is relatively small and the impact of back pressure on H2 transport resistance is significant and positively correlated. An increase in pressure resulted in a higher concentration of reactants in the gas flow channel. This makes collisions between gas molecules more violent, thereby linearly increasing the total mass transport resistance.
- (2)
- The RDM of GDLs is mainly dominated by porosity, pore size distribution, and thickness of both MPSs and MPLs. In the process of gas transport, the smaller pore size and porosity increase the force of gas on the pore wall. This will reduce the effective transport efficiency of hydrogen gas, resulting in an increase in transport resistance. On the other hand, with the increase in thickness, the gas transport paths become longer, increasing the tortuosity.
- (1)
- RP mainly comes from the MPL and substrate layers in GDL and is linearly related to pressure. In the substrate layer of DM, gas transport resistance is dominated by intermolecular diffusion, which is greatly affected by pressure. RNP mainly comes from MPL in GDL. Due to the extremely low porosity, Knudsen diffusion becomes the main diffusion mode and is less affected by pressure.
- (2)
- T060 without a MPL does not show RNP; RP and RNP are successfully separated for SGL 29BC and F91. The RNP of 29BC with a thicker MPL is higher. The increased number and denser arrangement of micropores in this GDL extended the diffusion distance of hydrogen molecules. It leads to an elevation in mass transport resistance and consequently an increase in RNP.
Supplementary Materials
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Wang, M.; Zhao, W.; Kong, S.; Chen, J.; Li, Y.; Liu, M.; Wu, M.; Wang, G. Elucidating the Mass Transportation Behavior of Gas Diffusion Layers via a H2 Limiting Current Test. Materials 2023, 16, 5670. https://doi.org/10.3390/ma16165670
Wang M, Zhao W, Kong S, Chen J, Li Y, Liu M, Wu M, Wang G. Elucidating the Mass Transportation Behavior of Gas Diffusion Layers via a H2 Limiting Current Test. Materials. 2023; 16(16):5670. https://doi.org/10.3390/ma16165670
Chicago/Turabian StyleWang, Min, Wei Zhao, Shuhan Kong, Juntao Chen, Yunfei Li, Mengqi Liu, Mingbo Wu, and Guanxiong Wang. 2023. "Elucidating the Mass Transportation Behavior of Gas Diffusion Layers via a H2 Limiting Current Test" Materials 16, no. 16: 5670. https://doi.org/10.3390/ma16165670