Fuel cell stack redesign and component integration radically increase power density

doi:10.1016/j.joule.2023.12.003

Fuel cell stack redesign and component integration radically increase power density

2024-01-01

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DOI：10.1016/j.joule.2023.12.003

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The drawbacks of conventional channel -rib flow fields and gas diffusion layers (GDLs) significantly limit the mass transfer and water management capability of proton exchange membrane fuel cells (PEMFCs), impacting volumetric power density. We report a GDLless design of electrode -flow field integration comprised of graphene-coated Ni foam and ultrathin (9.1 mm) carbon nanofiber film as an alternative to conventional channel -rib flow fields and GDLs, which substantially reduces membrane electrode assembly volume (90%), reactant transport distance (96%), and concentration impedance (88.6%), resulting in a remarkable 50% power density increase. The GDL-less design provides an effective strategy for the rational design of integrated electrode -flow field and will guide the future development of PEMFCs for their practical applications in energy conversion technologies. We estimate that the peak volumetric power density a PEMFC stack employing GDL-less design can achieve is 9.8 kW L-1, representing an increase of more than 80% compared with the state-of-the-art commercial PEMFC stack.

Keywords:

GAS-DIFFUSION LAYER

CATHODE CATALYST

DEGRADATION

DESIGN

PEMFC

FOAM

RESISTANCE

Fuel cell stack redesign and component integration radically increase power density

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