Effect of TEOS Additive as Proton Exchange Membrane on SPEEK-PVA and SPEEK-PVA-Boric Acid Blend Membranes

Year 2023, Volume: 1 Issue: 1, 25 - 36, 12.12.2023

Yavuz Yağızatlı , Alpay Şahin , İrfan Ar

Abstract

In this study, SPEEK-PVA and SPEEK-PVA-boric acid blend membranes doped with TEOS at different weight ratios (1%, 3%, and 5%) as proton exchange membranes were synthesized by the solution casting method. The synthesized membranes were characterized by FTIR, water uptake capacity, swelling property, size change, and ion exchange capacity experiments. As a result of FTIR analyses, the main peaks of SPEEK, PVA, and PVA-boric acid in the membrane matrix were determined, and an increase in peak intensities was observed as a result of the increase in the weight percentage of TEOS used as an additive material in the structure. As a result of FTIR analyses, it was determined that the structure was successfully synthesized. As a result of water uptake capacity, swelling, and size change experiments, it was understood that it was partially dissolved in water. TEOS additive increased the water uptake capacity of the membrane. In contrast, decreases in water uptake capacity were observed with the presence of boric acid in the membrane matrix. It was determined that ion exchange capacities increased with TEOS doping and water uptake capacity, and the highest ion exchange capacity was obtained as 1.97 meq/g with 5% TEOS doped SPEEK-PVA-BA coded membrane by weight.

Keywords

PEMFC, PVA-boric acid, SPEEK, blend membrane

Proton Değişim Membranı olarak SPEEK-PVA ve SPEEK-PVA-Borik Asit Karışım Membranlar üzerine TEOS Katkısının Etkisi

Abstract

Bu çalışmada, proton değişim membranı olarak farklı kütlesel yüzdelerde (%1, %3 ve %5) TEOS katkılı SPEEK-PVA ve SPEEK-PVA-borik asit karışım membranları çözelti döküm yöntemiyle sentezlenmiştir. Sentezlenen membranlar FTIR, su tutma kapasitesi, şişme özelliği, boyut değişimi ve iyon değişim kapasitesi deneyleri ile karakterize edilmiştir. FTIR analizleri sonucunda membran matrisinde bulunan SPEEK, PVA ve PVA-borik asit’in ana pikleri belirlenmiş ve katkı malzemesi olarak kullanılan TEOS’un yapıdaki kütlesel yüzdesinin artması sonucu pik şiddetlerinde artış gözlemlenmiştir. FTIR analizleri sonucu yapının başarılı bir şekilde sentezlendiği belirlenmiştir. Su tutma kapasitesi, şişme ve boyut değişimi deneyleri sonucunda yapının bir kısmının su içerisinde çözündüğü anlaşılmıştır. TEOS katkısı membranın su tutma kapasitesinin artmasını sağlamıştır. Bu durumun aksine membran matrisinde borik asitin bulunmasıyla su tutma kapasitelerinde azalmalar gözlemlenmiştir. TEOS katkısıyla birlikte su tutma kapasitesinde olduğu gibi iyon değişim kapasitelerinin de arttığı belirlenmiş ve en yüksek iyon değişim kapasitesi kütlece %5 TEOS katkılı SPEEK-PVA-BA kodlu membran ile 1.97 meq/g olarak elde edilmiştir.

Keywords

PEMFC, PVA-borik asit, SPEEK, karışım membran

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