Células a combustível de membrana de troca aniônica de alto desempenho baseadas em ionômeros sólidos
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2017
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SIMPÓSIO BRASILEIRO DE ELETROQUÍMICA E ELETROANALÍTICA, 21.
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Resumo
Alkaline polymer electrolyte fuel cells (APEFC) have received increased
attention in recent years as an alternative to well-established PEMFC because the
alkaline medium enables more efficient and faster electrochemical reactions using nonnoble
catalysts. The development of stable and conductive polymeric materials
employed as anion-exchange membranes (AEM) and anion-exchange ionomers (AEI)
has been the focus of substantial efforts. In this work, ETFE (poly(ethylene-cotetrafluoroethylene))
powders were electron-beamed radiation-grafted (RG) with
vinylbenzyl chloride (VBC) monomer and then either aminated with trimethylammonium
(TMA) or N-methylpyrrolidinium (MPY). The resulting powders were employed as the
AEI in the gas diffusion electrodes in single cell H2/O2 APEFCs (along with RG-AEMs).
The results showed that the degree of grafting (DoG), and consequently the ionexchange
capacity (IEC), are strongly dependent on the radiation dose. RG-AEI made
from ETFE irradiated at 100 kGy (total absorbed dose) and functionalised with TMA
(ETFE100TMA) and MPY (ETFE100MPY) exhibit IEC values of 2.05 and 1.91
meq.mol-1, respectively. The H2/O2 power density curves (Fig. 1) for APEFC with
ETFE100TMA in both anode and cathode; ETFE100MPY in both anode and cathode,
and ETFE100TMA in anode and ETFE100MPY in cathode, revealed high
performances (> 800 mW cm-2). The best performance was observed for with the
ETFE100TMA anode and ETFE100MPY cathode (maximum power density of 1.1
W.cm-2).
Como referenciar
SANTIAGO, E.I.; PONCE-GONZALEZ, J.; WANG, L.; VARCOE, J.R. Células a combustível de membrana de troca aniônica de alto desempenho baseadas em ionômeros sólidos. In: SIMPÓSIO BRASILEIRO DE ELETROQUÍMICA E ELETROANALÍTICA, 21., 17-21 de abril, 2017, Natal, RN. Resumo... Campinas, SP: Galoá, 2017. Disponível em: http://repositorio.ipen.br/handle/123456789/31190. Acesso em: 24 Apr 2024.
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