Effect of high aspect ratio additives on microstructural and mass transport properties of the microporous layer in a proton exchange membrane fuel cell

被引:6
作者
Mehrazi, Shirin [1 ]
Sarker, Mrittunjoy [2 ]
Chuang, Po-Ya Abel [1 ,2 ]
机构
[1] Univ Calif Merced, Environm Syst Grad Grp, Merced, CA 95343 USA
[2] Univ Calif Merced, Dept Mech Engn, Merced, CA 95343 USA
关键词
Microporous layer; Carbon nanotube; Graphene; Rheology; Limiting current test; GAS-DIFFUSION LAYERS; CARBON-BLACK SUSPENSIONS; MICRO-POROUS LAYER; OXYGEN-TRANSPORT; WATER MANAGEMENT; FLOW BATTERIES; GRAPHENE; PERFORMANCE; HUMIDITY; RHEOLOGY;
D O I
10.1016/j.jpowsour.2023.233361
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Tuning up transport properties of the microporous layer is an effective way to enhance mass transport in a proton exchange membrane fuel cell. The incorporation of non-spherical conductive additives in the conventional microporous layer can modify its pore structure. In this study, 5, 20, and 50 wt.% of two high aspect ratio additives, multiwall carbon nanotube and graphene nanoplatelet, are mixed with the acetylene -black carbon to systematically study their impact on ink and the final diffusion media properties. Using a bottom-up approach, the rheological properties of the ink are correlated to the mass transport resistance in the diffusion media. The ink with additives exhibits rheological properties of a less compact microstructure with large agglomerates. Whereas, a more compact agglomerated network is observed from the ink with pure acetylene black carbon nanoparticles. Graphene nanoplatelet has a dominating effect on the surface quality of the microporous layers due to its two-dimensional structure. The test results show that the microstructure formed by the synergy of acetylene black and additives can enhance ohmic and mass transport performance. 20 wt.% of the additive loading is found to be optimal and multiwall carbon nanotube shows the best fuel cell performance.
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页数:11
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