Titanium Dioxide Grafted on Graphene Oxide: Hybrid Nanofiller for Effective and Low-Cost Proton Exchange Membranes.
Cataldo SimariErnestino LufranoNicolas GodbertDimitrios GournisLuigi CoppolaIsabella NicoteraPublished in: Nanomaterials (Basel, Switzerland) (2020)
A nanostructured hybrid material consisting of TiO2 nanoparticles grown and stabilized on graphene oxide (GO) platelets, was synthesized and tested as nanofiller in a polymeric matrix of sulfonated polysulfone (sPSU) for the preparation of new and low-cost nanocomposite electrolytes for proton exchange membrane fuel cell (PEMFC) applications. GO-TiO2 hybrid material combines the nanoscale structure, large interfacial area, and mechanical features of a 2D, layered material, and the hygroscopicity properties of ceramic oxides, able to maintain a suitable hydration of the membrane under harsh fuel cell operative conditions. GO-TiO2 was synthetized through a new, simple, one-pot hydrothermal procedure, while nanocomposite membranes were prepared by casting using different filler loadings. Both material and membranes were investigated by a combination of XRD, Raman, FTIR, thermo-mechanical analysis (TGA and Dynamic Mechanical Analysis) and SEM microscopy, while extensive studies on the proton transport properties were carried out by Electrochemical Impedance Spectroscopy (EIS) measurements and pulse field gradient (PFG) NMR spectroscopy. The addition of GO-TiO2 to the sPSU produced a highly stable network, with an increasing of the storage modulus three-fold higher than the filler-free sPSU membrane. Moreover, the composite membrane with 3 wt.% of filler content demonstrated very high water-retention capacity at high temperatures as well as a remarkable proton mobility, especially in very low relative humidity conditions, marking a step ahead of the state of the art in PEMs. This suggests that an architecture between polymer and filler was created with interconnected routes for an efficient proton transport.
Keyphrases
- low cost
- quantum dots
- hyaluronic acid
- visible light
- electron transfer
- ionic liquid
- single cell
- reduced graphene oxide
- high resolution
- cell therapy
- gold nanoparticles
- label free
- drug delivery
- blood pressure
- magnetic resonance
- molecularly imprinted
- solid state
- magnetic resonance imaging
- optical coherence tomography
- cancer therapy
- anaerobic digestion
- carbon nanotubes
- mass spectrometry
- drug release
- sewage sludge
- high speed
- municipal solid waste
- heavy metals
- tandem mass spectrometry