Title: Mathematical modeling of novel porous transport layer architectures for proton exchange membrane electrolysis cells

Abstract

Thin foil based porous transport layers (PTLs) that contain highly structured pore arrays have shown promise as anode PTLs in proton exchange membrane electrolysis cells. These novel PTLs, fabricated with advanced manufacturing techniques, produce thin, tunable, multifunctional layers with reduced flow and interfacial resistances and high thermal and electric conductivities. To further optimize their design, it is important to understand their fundamental impact on the transport of protons, electrons, and liquid/vapor mixtures in the electrode. In this work, we develop a two-dimensional multiphysics model to simulate the coupled electrochemistry and multiphase transport in an electrolysis cell operated with the novel PTL architecture. The results show that larger pores improve access of water to the anode catalyst layer, which is beneficial for both the oxygen evolution reaction and membrane hydration. Larger pore sizes also improve oxygen gas transport from the catalyst layer, because generated oxygen gas is forced to travel in-plane through the anode catalyst layer until it reaches a pore opening that is connected to a channel. The discussed results confirm that the proposed thin foil based PTLs are fundamentally different from conventional PTLs, such as felts or layered meshes. The model developed in this work also provides generalizable insightmore » into fundamental PEMEC phenomena, such as the competition between liquid and gas phase transport, membrane hydration and water management, and nonuniform electrochemical reactions, which are processes relevant to all PEMEC designs.« less

Authors:

Wrubel, Jacob A.  ^[1];

• Search DOE PAGES for author "Wrubel, Jacob A."
• Search DOE PAGES for ORCID "0000-0002-3347-0768"

Kang, Zhenye  ^[1];

• Search DOE PAGES for author "Kang, Zhenye"
• Search DOE PAGES for ORCID "0000-0002-1731-0705"

Witteman, Liam  ^[1];

• Search DOE PAGES for author "Witteman, Liam"
• Search DOE PAGES for ORCID "0000-0001-8450-8263"

Zhang, Feng-Yuan ^[2]; Ma, Zhiwen  ^[1];

• Search DOE PAGES for author "Ma, Zhiwen"
• Search DOE PAGES for ORCID "0000-0003-3718-8038"

Bender, Guido  ^[1]

• Search DOE PAGES for author "Bender, Guido"
• Search DOE PAGES for ORCID "0000-0003-3777-4707"

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+ Show Author Affiliations

1. National Renewable Energy Lab. (NREL), Golden, CO (United States)
2. Univ. of Tennessee Space Inst. (UTSI), Tullahoma, TN (United States)

Publication Date:

Fri Jun 11 00:00:00 EDT 2021

Research Org.:

National Renewable Energy Lab. (NREL), Golden, CO (United States)

Sponsoring Org.:

USDOE Office of Energy Efficiency and Renewable Energy (EERE)

OSTI Identifier:

1805196

Alternate Identifier(s):

OSTI ID: 1806339

Report Number(s):

NREL/JA-5700-77128
Journal ID: ISSN 0360-3199; MainId:26074;UUID:2728801f-b5ce-4132-aa68-c88721430e32;MainAdminID:25709

Grant/Contract Number:  

AC36-08GO28308

Resource Type:

Accepted Manuscript

Journal Name:

International Journal of Hydrogen Energy

Additional Journal Information:

Journal Volume: 46; Journal Issue: 50; Journal ID: ISSN 0360-3199

Publisher:

Elsevier

Country of Publication:

United States

Language:

English

Subject:

25 ENERGY STORAGE; electrochemical; electrochemical modeling; electrolysis; H2New; hydrogen; multiphase transport; porous transport layer