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Titanium Dioxide/Phosphorous-Functionalized Cellulose Acetate Nanocomposite Membranes for DMFC Applications:
Randa E Khalifa1, Ahmed M Omer1, Mohamed H Abd Elmageed2
1Polymer Materials Research Department, Advanced Technologies and New Materials Research Institute (ATNMRI), City of Scientific Research and Technological Applications (SRTA-City), New Borg El-Arab City, P.O. Box 21934, Alexandria 21934, Egypt.
New titanium dioxide (TiO2)/phosphorous-functionalized cellulose acetate (Ph-CA) nanocomposite membranes were developed for direct methanol fuel cells (DMFCs). These membranes show improved ion-exchange capacity and lower methanol permeability, suggesting potential for DMFC applications.
Area of Science:
- Materials Science
- Electrochemistry
- Polymer Science
Background:
- Direct methanol fuel cells (DMFCs) require advanced polyelectrolyte membranes for efficient energy conversion.
- Current membranes face challenges in terms of stability, ion conductivity, and methanol crossover.
- Developing novel composite materials is crucial for enhancing DMFC performance.
Purpose of the Study:
- To synthesize and characterize novel TiO2/phosphorous-functionalized cellulose acetate (Ph-CA) nanocomposite membranes.
- To evaluate the performance, mechanical properties, and stability of these membranes for DMFC applications.
- To investigate the effect of TiO2 nanoparticle loading on membrane properties.
Main Methods:
- Nanocomposite membranes fabricated using solution casting with varying TiO2 content.
- Characterization via FTIR, TGA, SEM, and AFM.
- Evaluation of ion-exchange capacity (IEC), mechanical strength, water uptake, thermal-oxidative stability, and methanol permeability.
Main Results:
- TiO2/Ph-CA membranes exhibited enhanced ion-exchange capacity (up to 2.01 m_eq/g at 80 °C) compared to pristine Ph-CA.
- The nanocomposite membranes showed excellent thermal stability and good mechanical properties (49.9 MPa).
- Significantly reduced methanol permeability (0.98 × 10^-16 cm^2 s^-1) compared to Nafion 117 was observed.
Conclusions:
- The developed TiO2/Ph-CA nanocomposite membranes demonstrate superior properties for DMFC applications.
- These membranes offer a promising alternative to conventional polyelectrolyte membranes.
- The findings suggest potential for improved efficiency and durability in direct methanol fuel cells.
