Preparation of polybenzimidazole/ZIF-8 and polybenzimidazole/UiO-66 composite membranes with enhanced proton conductivity


Eren E. O. , ÖZKAN N., Devrim Y.

International Journal of Hydrogen Energy, vol.47, no.45, pp.19690-19701, 2022 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 47 Issue: 45
  • Publication Date: 2022
  • Doi Number: 10.1016/j.ijhydene.2021.11.045
  • Journal Name: International Journal of Hydrogen Energy
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, PASCAL, Artic & Antarctic Regions, Chemical Abstracts Core, Communication Abstracts, Environment Index, INSPEC
  • Page Numbers: pp.19690-19701
  • Keywords: Polybenzimidazole, Metal-organic-frameworks, Proton conductivity, Composite membranes, Hydrogen energy, ACID DOPED POLYBENZIMIDAZOLE, METAL-ORGANIC FRAMEWORKS, MIXED MATRIX MEMBRANES, ASSISTED SYNTHESIS, HYDROGEN STORAGE, FUEL-CELLS, ZIF-8, WATER, PERFORMANCE, ADSORPTION
  • Middle East Technical University Affiliated: Yes

Abstract

© 2021 Hydrogen Energy Publications LLCMetal-organic frameworks (MOFs) are considered emerging materials as they further improve the various properties of polymer membranes used in energy applications, ranging from electrochemical storage and purification of hydrogen to proton exchange membrane fuel cells. Herein, we fabricate composite membranes consisting of polybenzimidazole (PBI) polymer as a matrix and MOFs as filler. Synthesis of ZIF-8 and UiO-66 MOFs are conducted through a typical solvothermal method, and composite membranes are fabricated with different MOF compositions (e.g., 2.5, 5.0, 7.5, and 10.0 wt %). We report a significant improvement in proton conductivity compared with the pristine PBI; for example, more than a three-fold increase in conductivity is observed when the PBI-UiO66 (10.0 wt %) and PBI-ZIF8 (10.0 wt %) membranes are tested at 160 °C. Proton conductivities of the composite membranes vary between 0.225 and 0.316 S cm−1 at 140 and 160 °C. For the comparison, pure PBI exhibits 0.060 S cm−1 at 140 °C and 0.083 S cm−1 at 160 °C. However, we also report a decrease in permeability and mechanical stability with the composite membranes.