780 publications from this institution
Few-layers graphene oxide enriched with oxygen functional groups is successfully obtained and incorporated into sulfonated polyether ether ketone (SPEEK) matrix. The functional groups and the surface modification of membranes were identified using FTIR spectroscopy, and X-ray Photoelectron Spectroscopy (XPS). Subsequently, FESEM was employed to study the surface morphology changes, and the X-Ray diffraction (XRD) was performed to ascertain the crystallinity of the fabricated membrane. The distribution of carbonaceous fillers GO in SPEEK matrix was found to actively improved the ion exchange capacity (IEC), and concurrently obstructed the methanol crossover, thus making them intriguing candidates as proton exchange membranes (PEMs).
Asymmetric pore configuration of dual-layer hollow fibre catalyst membrane of NiO-YSZ (inner layer)/La0.7Sr0.3Co0.2Fe0.8O3-δ-YSZ (outer layer) has been studied from its morphology and oxygen transport point of view. The membrane was synthesized by phase inversion method and co-extruded using water as the external coagulant and water, ethanol and NMP mixture as the internal coagulant (bore liquid mixture), followed by sintering at 1300 °C for 8h. Volume ratio of water:ethanol:NMP was 4:1:5. The resulted dual-layer membrane has non-sandwich like pore configuration. SEM images of the membrane showed finger-like pores on the internal side and sponge-like pores on the external side. Bending strength of the membrane was 9.76 MPa and nitrogen permeability (gas tightness) was 1.36 x 10−4 mol.m−2.s−2. Pa−1. The oxygen permeability of the membrane at 600, 700 and 800 °C was 2.78 x 10-8, 2.84 x 10−8 and 3.10 x 10-8 mol.s−1.cm-2, respectively, which is about two order of magnitude lower than oxygen permeability of other reported perovskite-based membranes.
