Triple phase boundary augmentation in hierarchical, Pt grafted N-doped mesoporous carbon nanofibers for high performance and durable PEM fuel cells

2018 ◽  
Vol 6 (26) ◽  
pp. 12768-12781 ◽  
Author(s):  
Karthikeyan K. Karuppanan ◽  
Appu V. Raghu ◽  
Manoj Kumar Panthalingal ◽  
Sivasubramanian Ramanathan ◽  
Thanarajan Kumaresan ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Phase Boundary ◽  
Carbon Nanofibers ◽  
Mesoporous Carbon ◽  
High Performance ◽  
Pem Fuel Cells ◽  
Triple Phase Boundary

Pt-grafted, hierarchical mesoporous carbon nanofibers (Pt/MPCNFs) electrocatalysts have been developed using electrospinning for high-performance PEM fuel cells.

Reaction Kinetics at the Triple-Phase Boundary in PEM Fuel Cells

2008 ◽  
Vol 5 (2) ◽  
Author(s):  
P. Berg ◽  
A. Novruzi ◽  
O. Volkov
Keyword(s):  
Fuel Cells ◽  
Phase Boundary ◽  
Reaction Kinetics ◽  
Surface Diffusion ◽  
Liquid Water ◽  
Numerical Technique ◽  
Pem Fuel Cells ◽  
Proton Exchange ◽  
Chemical Components ◽  
Triple Phase Boundary

A mathematical model is developed to describe the reaction dynamics in the vicinity of the triple-phase boundary (TPB), which is an important part of the pore scale structure of the catalyst layer in proton exchange membrane fuel cells. The model incorporates coupled diffusion, migration, and reaction phenomena of the chemical components in an undersaturated air pore and ionomer. One challenging feature of the work is the description of the TPB by a system of nonlinear partial differential equations (PDEs), coupling bulk, and surface-diffusion phenomena, which offers an approach to study the rarely investigated proton surface diffusion along the air pore surface. A numerical technique is implemented, taking into account the particular form of the domain, in order to solve the nonlinear PDE system efficiently. Several numerical results are discussed, including a sensitivity analysis with respect to the physical reference case and geometric parameters. The results indicate that surface diffusion might play a major role for the reaction kinetics, but only if the air pore is void of liquid water. In contrast, the formation of liquid water in the gas pores will turn surface diffusion into bulk diffusion, with the latter resembling the Grotthus mechanism.

g-C3N4 promoted MOF derived hollow carbon nanopolyhedra doped with high density/fraction of single Fe atoms as an ultra-high performance non-precious catalyst towards acidic ORR and PEM fuel cells

2019 ◽  
Vol 7 (9) ◽  
pp. 5020-5030 ◽  
Author(s):  
Yijie Deng ◽  
Bin Chi ◽  
Xinlong Tian ◽  
Zhiming Cui ◽  
Ershuai Liu ◽  
...  
Keyword(s):  
Fuel Cells ◽  
High Performance ◽  
Pem Fuel Cells ◽  
High Density ◽  
Density Fraction ◽  
Hollow Carbon

Atomic Fe-doped hollow carbon nanopolyhedra as efficient ORR catalysts.

Oxidised Carbon Nanofibers as Platinum Support for Proton Exchange Membrane (PEM) Fuel Cells

2008 ◽  
Vol 6 (6) ◽  
pp. 1059-1067 ◽  
Author(s):  
R. Moliner ◽  
M. J. Lázaro ◽  
L. Calvillo ◽  
D. Sebastián ◽  
Y. Echegoyen ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Carbon Nanofibers ◽  
Proton Exchange Membrane ◽  
Pem Fuel Cells ◽  
Proton Exchange ◽  
Exchange Membrane
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