A quantification study of hydrogen-induced cohesion reduction at the atomic scale
In: Materials and design, Band 218, S. 110702
ISSN: 1873-4197
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In: Materials and design, Band 218, S. 110702
ISSN: 1873-4197
In: Materials and design, Band 217, S. 110643
ISSN: 1873-4197
In: Waste management: international journal of integrated waste management, science and technology, Band 88, S. 85-95
ISSN: 1879-2456
In: Materials & Design, Band 55, S. 533-541
In: HELIYON-D-24-45157
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In: Computers and electronics in agriculture: COMPAG online ; an international journal, Band 213, S. 108216
In: Computers and electronics in agriculture: COMPAG online ; an international journal, Band 142, S. 201-210
In: Materials and design, Band 242, S. 113009
ISSN: 1873-4197
In: BITE-D-22-02871
SSRN
In: Defence Technology, Band 22, S. 135-143
ISSN: 2214-9147
In: Carbon neutrality, Band 3, Heft 1
ISSN: 2731-3948
AbstractImproving the performance of proton exchange membrane fuel cells (PEMFCs) requires deep understanding of the reactive transport processes inside the catalyst layers (CLs). In this study, a particle-overlapping model is developed for accurately describing the hierarchical structures and oxygen reactive transport processes in CLs. The analytical solutions derived from this model indicate that carbon particle overlap increases ionomer thickness, reduces specific surface areas of ionomer and carbon, and further intensifies the local oxygen transport resistance (Rother). The relationship between Rother and roughness factor predicted by the model in the range of 800-1600 s m-1 agrees well with the experiments. Then, a multiscale model is developed by coupling the particle-overlapping model with cell-scale models, which is validated by comparing with the polarization curves and local current density distribution obtained in experiments. The relative error of local current density distribution is below 15% in the ohmic polarization region. Finally, the multiscale model is employed to explore effects of CL structural parameters including Pt loading, I/C, ionomer coverage and carbon particle radius on the cell performance as well as the phase-change-induced (PCI) flow and capillary-driven (CD) flow in CL. The result demonstrates that the CL structural parameters have significant effects on the cell performance as well as the PCI and CD flows. Optimizing the CL structure can increase the current density and further enhance the heat-pipe effect within the CL, leading to overall higher PCI and CD rates. The maximum increase of PCI and CD rates can exceed 145%. Besides, the enhanced heat-pipe effect causes the reverse flow regions of PCI and CD near the CL/PEM interface, which can occupy about 30% of the CL. The multiscale model significantly contributes to a deep understanding of reactive transport and multiphase heat transfer processes inside PEMFCs.
In: Environmental science and pollution research: ESPR, Band 31, Heft 22, S. 33047-33057
ISSN: 1614-7499
In: Environmental science and pollution research: ESPR, Band 30, Heft 58, S. 121702-121712
ISSN: 1614-7499
In: Materials and design, Band 170, S. 107697
ISSN: 1873-4197
In: JWPE-D-24-04527
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