267 documents found, page 1 of 27
Chitosan doped membranes for electrochemical devices
Teixeira, António P. S.; Teixeira, Fátima C.; Rangel, C. M.; Naffati, NaimaThe development of new proton exchange membrane (PEM) for electrochemical devices, such as fuel cells and electrolyzers, have attracted researcher’s attention in the pursuit for more sustainable and cost-effective technologies for clean energy production, being extensive those for CO2 reduction and conversion1,2. To this end, in the present work, new modified chitosan (CS) membranes doped with ionic liquids (IL...
Enhancing Conductivity in PEM Chitosan Membranes through Bisphosphonate Graphen...
Teixeira, António P. S.; Teixeira, Fátima C.; Rangel, C. M.; Naffati, NaimaProton exchange membranes (PEM) are a key component on several electrochemical devices, such as fuel cells and electrolysers, and hold great promises for various technological applications. However, their properties, including their limited proton conductivity, remain a significant challenge. In this study, a novel approach to improve the conductivity of chitosan membranes was used, through the incorporation of...
New SPEEK Membranes Modified with Bisphosphonate Dopants
Teixeira, António P. S.; Teixeira, Fátima C.; Rangel, C. M.Sustainable emerging energy technologies are pivotal to a decarbonized society that still continuously increases its energy demands. Fuel cells and eletrolyzers are part of these promising sustainable technologies, but they still depend on several factors, especially on their membranes. These are a key component acting as a separator, between their different materials and electrolytes of different devices’ comp...
New membranes for CO2 electrochemical reduction
Teixeira, António P. S.; Teixeira, Fátima C.; Rangel, C. M.; Messias, S.; Martins, R.; Mendes, J. M.; Reis Machado, Ana S.The use of CO2 as a valuable feedstock to obtain new useful fuels and materials, such as CO, alcohols, formic acid and hydrocarbons, has become an important research field that can contribute to valuable strategies in carbon resource utilization, such as the Electrochemical CO2 Reduction (ECR). The process is carried out in electrolyzers, which have a membrane as a key component to separate the two-half cells, ...
New triazinephosphonate dopants for Nafion proton exchange membranes (PEM)
Teixeira, António P. S.; Teixeira, Fátima C.; Rangel, C. M.A new paradigm for energy is underway demanding decarbonized energy systems. Some of them rely on emerging electrochemical devices, crucial in hydrogen technologies, including fuel cells, CO2 and water electrolysers, whose applications and performances depend on key components such as their separators/ion-exchange membranes. The most studied and already commercialized Nafion membrane shows great chemical stabil...
New proton exchange membranes based on ionic liquid doped chitosan
Teixeira, António P. S.; Teixeira, Fátima C.; Rangel, C. M.; Naffati, NaimaThe development of new proton exchange membranes (PEM) for electrochemical devices have attracted re searcher’s attention in the pursuit for more sustainable and cost-effective technologies for clean energy pro duction and conversion. In this work, new doped chitosan (CS) membranes were prepared by the casting method. Chitosan is an abundant, biodegradable and non-toxic material, and as a membrane, a sustaina...
New Modified SPEEK-Based Proton Exchange Membranes
Teixeira, António P. S.; Teixeira, Fátima C.; Rangel, C. M.A decarbonized society demands cleaner and sustainable energy sources based on well-established or emerging technologies with the potential to make a significant contribution to energy storage and conversion, such as batteries, fuel cells and water and/or CO2 electrolyzers. The performance of these electrochemical devices relies on key components such as their separators/ion-exchange membranes. The most common ...
Economia do Hidrogénio Verde: Ferramentas para o Apoio à Decisão [Poster]
Simoes, Sofia; Simões, Teresa; Quental, Lídia; Catarino, Justina; Amorim, Filipa; Brás, Teresa; Patinha, Pedro; Lopes, Tiago; Rodrigues, CarlosRESUMO: O Hidrogénio (H2) Verde perspetiva-se como um vetor energético indispensável para alcançar a neutralidade carbónica em 2050, porém a economia deste vetor está em desenvolvimento e os agentes económicos precisam de fontes de informação confiáveis e ajustadas ao contexto nacional e Europeu. Neste sentido, o LNEG desenvolve investigação em vários domínios relacionados com o H2 verde, desde o estudo e desen...
Chemical stability of new nafion membranes doped with bisphosphonic acids under...
Teixeira, António P. S.; Teixeira, Fátima C.; Rangel, C. M.The development of new proton exchange membranes for PEM technology in fuel cells and electrolysers with increased durability is paramount to system's lifetime and scalability. In this work, new modified Nafion membranes doped with bisphosphonic acids are proposed with increased resilience to chemical degradation by H2O2/Fe2+, mimicking ex-situ radical attack to membrane structure. Relevant properties were eval...
New triazine-phosphonate dopants for proton exchange membranes (PEM)
Teixeira, António P. S.; Teixeira, Fátima C.; Rangel, C. M.g their operating temperature range. Our previous studies have demonstrated that the incorporation of aryl or heterocyclic phosphonic acid dopants into Nafion, by casting, results in an enhancement of the proton conductivity1-4 and stability5 of the Nafion doped membranes. This work reports the synthesis and characterization of a new series of triazine-phosphonate derivatives for use as dopants in the preparati...