A new silicon oxycarbide based gas diffusion layer for zinc-air batteries
Veröffentlichungsdatum
2020-06-05
Zusammenfassung
Rational material designs play a vital role in the gas diffusion layer (GDL) by increasing the oxygen diffusion rate and, consequently, facilitating a longer cycle life for metal-air batteries. In this work, a new porous conductive ceramic membrane has been developed as a cathodic GDL for zinc-air battery (ZAB). The bilayered structure with a thickness of 390 μm and an open porosity of 55% is derived from a preceramic precursor with the help of the freeze tape casting technique. The hydrophobic behaviour of the GDL is proved by the water contact angle of 137.5° after the coating of polytetrafluoroethylene (PTFE). The electrical conductivity of 5.59 * 10-3 S/cm is reached using graphite and MWCNT as filler materials. Tested in a ZAB system, the as-prepared GDL coated with commercial Pt-Ru/C catalyst shows an excellent cycle life over 200 cycles and complete discharge over 48 h by consuming oxygen from the atmosphere, which is comparable to commercial electrodes. The as-prepared electrode exhibits excellent ZAB performance due to the symmetric sponge-like structure, which facilitates the oxygen exchange rate and offers a short path for the oxygen ion/-electron kinetics. Thus, this work highlights the importance of a simple manufacturing process that significantly influences advanced ZAB enhancement.
Schlagwörter
Freeze tape casting
;
Gas diffusion layer
;
Polymer-derived ceramics
;
Porous membrane
;
Zinc-air battery
Verlag
Elsevier {BV}
Institution
Dokumenttyp
Artikel/Aufsatz
Zeitschrift/Sammelwerk
Band
577
Startseite
494
Endseite
502
Seitenzahl
9
Zweitveröffentlichung
Ja
Dokumentversion
Postprint
Sprache
Englisch
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Name
MONI - A New Silicon Oxycarbide Based Gas Diffusion Layer.pdf
Size
3.73 MB
Format
Adobe PDF
Checksum
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