In:
Journal of Materials Chemistry A, Royal Society of Chemistry (RSC), Vol. 11, No. 34 ( 2023), p. 18409-18418
Abstract:
Phosphoric acid-doped polybenzimidazole (PA-doped PBI) membranes enable high-temperature polymer electrolyte membrane fuel cells (HT-PEMFCs) to operate at elevated temperature (140–180 °C), with the advantages of simplified water/heat management. However, the relatively long start-up time and insufficient performance due to the introduction of the liquid phosphoric acid electrolyte are still major barriers to the application of HT-PEMFCs. Herein, a series of alkyl-substituted poly(arylene piperidinium) membranes are designed to modulate the content and distribution of phosphoric acid, which significantly reduces the ohmic and mass transfer resistance and boosts the performance of HT-PEMFCs in a wide operational temperature range. By tailoring the pendant alkyl groups of the piperidinium cations, the steric hindrance around the piperidinium cations and the free volume of poly(arylene piperidinium) can be well regulated. The optimized isobutyl-substituted poly(arylene piperidinium) membrane shows a high acid doping level (10.05) and a relatively high proton conductivity. As a result, a PEMFC based on this membrane shows significantly low ohmic and mass transfer resistances, consequently enhancing the peak power density of the HT-PEMFC to 〉 1.5 W cm −2 at a moderate temperature of 120 °C under H 2 /O 2 conditions.
Type of Medium:
Online Resource
ISSN:
2050-7488
,
2050-7496
Language:
English
Publisher:
Royal Society of Chemistry (RSC)
Publication Date:
2023
detail.hit.zdb_id:
2702232-8
detail.hit.zdb_id:
2696984-1
Permalink