Development of nafion and cellulose nanocrystals nanocomposite electrolytes for use in proton exchange membrane water electrolysis (PEMWEs)
| Autor: | Aguiar, Jéssica de |
|---|---|
| Přispěvatelé: | Marconcini, José Manoel, Mattoso, Luiz Henrique Capparelli |
| Jazyk: | portugalština |
| Rok vydání: | 2022 |
| Předmět: |
Nanocristais de celulose (CNCs)
Enzymatic hydrolysis Nafion Proton Exchange Membrane Water Electrolysis (PEMWE) Biomassa de cana-de- açúcar Hidrólise enzimática Células eletrolíticas com membrana trocadora de prótons (PEMECs) Sugarcane biomass Cellulose Nanocrystals (CNCs) ENGENHARIA DE MATERIAIS E METALURGICA::MATERIAIS NAO METALICOS [ENGENHARIAS] |
| Zdroj: | Repositório Institucional da UFSCAR Universidade Federal de São Carlos (UFSCAR) instacron:UFSCAR |
| Popis: | Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) Proton exchange membrane water electrolysis (PEMWE) performs the electrolysis of water to produce hydrogen, a source of clean and renewable energy. The most used commercial electrolyte in PEMWE is the Nafion membrane, a material that is expensive and difficult to recycle. The partial replacement of Nafion with cellulose nanocrystals (CNCs) can produce composite membranes can increased electrical, mechanical and biodegradability properties. In this sense, the objective of this work is to study the elaboration of nanocomposites (Nafion-CNC) aiming at developing high-performance electrolytes for application in PEMWE. In the first stage of the work, the potential of using agro-industrial residues (bagasse and sugarcane straw) to obtain CNCs via enzymatic hydrolysis was evaluated. CNCs obtained from both biomasses showed high crystallinity index (> 70%) and high thermal stability (Tonset > 300 °C). In the second stage, the effects of adding CNCs to Nafion were evaluated. Nafion membranes were produced with two types of CNCs, one obtained by enzymatic hydrolysis and the other by acid hydrolysis (commercial). The addition of both CNCs has similar effects on Nafion’s properties. For samples with both commercial and enzymatic CNC, an increase in the modulus of elasticity (10% and 40% respectively) and maximum stress (10% and 13% respectively) was observed. The two nanocomposites showedlower initial thermal degradation temperatures, however, they still showed sufficient stability (Tonset > 170°C) for application in PEMWE (standard operating temperature 70%) e alta estabilidade térmica (Tonset > 300 °C). Na segunda etapa foram avaliados os efeitos da adição de CNCs ao Nafion. Foram produzidas membranas de nafion com dois tipos de CNCs, um obtido por hidrólise enzimática e outro com CNCs comercial, obtidos por hidrólise ácida. A adição de ambos os CNCs acarretam efeitos similares nas propriedades das membranas. Para as amostras tanto com CNC comercial quanto CNC enzimático foi observado aumento no módulo de elasticidade (respectivamente 10% e 40%) e tensão máxima (respectivamente 10% e 13%). Os dois nanocompósitos apresentaram redução na temperatura de início de degradação térmica, contudo ainda apresentaram estabilidade suficiente (Tonset > 170 °C) para aplicação em PEMECs (temperatura padrão de operação |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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