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Article Citation - WoS: 8Citation - Scopus: 11Development and Performance Analysis of Polybenzimidazole/Boron Nitride Composite Membranes for High-Temperature Pem Fuel Cells(Wiley, 2022) Hussin, Dedar Emad; Budak, Yagmur; Devrim, YilserIn this research, polybenzimidazole/boron nitride (PBI/BN) based composite membranes have been prepared for high-temperature PEM fuel cell (HT-PEMFC). BN was preferred because of its superior thermal robustness, high chemical stability, non-conductor property, and high plasticizer characteristic. The loading of BN in the composite membrane was studied between 2.5 to 10 wt%. The composite membranes were characterized using TGA, DSC, XRD, SEM, mechanical tests, acid doping/leaching, and proton conductivity measurements. The highest conductivity of 0.260 S/cm was found for PBI/BN-2.5 membrane at 180 degrees C. It has been determined that the PBI/BN-2.5 membrane has higher performance than the PBI membrane according to the HT-PEMFC tests performed with Hydrogen and dry air. The heightened HT-PEMFC performance can be ascribed to interactive effects between BN particles and the PBI polymer matrix. PBI/BN composite membranes show a good perspective in the high-temperature PEMFC applications.Article Structure–Property–Performance Relationship of Graphene Oxide Modified Composite Membranes for Anion Exchange Membrane Electrolyzers(John Wiley and Sons Inc, 2026) Devrim, Yılser; Altinisik, Hasan; Abay, Ogün; Özalp, Ercan; Kim, Hern; Önel, Nisa GökçenIn this study, graphene oxide (GO)-modified poly (phenylene oxide, PPO) anion exchange membranes (F/GO) were developed forapplication in anion exchange membrane electrolyzers (AEMELs). The incorporation of GO enhanced membrane hydration, ion-exchange capacity, and hydroxide-ion conductivity, resulting in an ~15% increase in current density at 2.0 V and 80°C (0.551 A/cm2) compared with the pristine membrane (0.480 A/cm−2). The F/GO membranes also showed enhanced hydrogen productionrates and an HHV-based energy efficiency of 76% at 0.5 A/cm2 and 80°C. These results underscore the potential for F/GO mem-branes in scalable AEMEL applications. Mechanical and alkaline stability tests confirmed robustness under harsh conditions.These findings demonstrate that the incorporation of GO provides a simple, scalable, and potentially lower-cost modificationstrategy compared with highly engineered polymer architectures, while also improving overall electrolyzer performance, high-lighting the potential of GO-modified membranes for practical hydrogen production in AEMEL systems.
