Effect of acid treatment on the physico-chemical properties of Nafion 117 membrane. (8th June 2022)

• Record Type: Journal Article
• Authors: Iriarte, Delfina; Andrada, Heber; Maldonado Ochoa, Santiago A.; Silva, O. Fernando; Vaca Chávez, Fabián; Carreras, Alejo
• Is Part Of: International journal of hydrogen energy. Volume 47:Number 49(2022)
• Page Start: 21253
• Page End: 21260
• Publication Date: 2022-06-08
• Subjects: Nafion membrane -- Acid pretreatment -- NMR -- Proton conductivity; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2022.04.246
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: In this work, the effect on the physico-chemical properties of Nafion 117 membrane due to the treatment with HCl, H2 SO4 and HNO3 was studied. Water uptake, crystallinity, proton conductivity and water dynamics were evaluated on treated and non-treated membranes. An increase in the water uptake and conductivity and a decrease in the crystallinity were observed in treated membranes in comparison with the untreated one. The water dynamics, studied by spin-spin NMR relaxometry, suggests that treated membranes have a more uniform channel size distribution. The treatment with HCl and HNO3 showed higher conductivity and water uptake than H2 SO4 . Graphical abstract: Image 1 Highlights: Modifications in the polymeric channel structure produced by acid treatment. Changes in the water uptake, crystallinity and proton conductivity due to the acid treatment. Dynamics of water molecules studied by NMR.