A facile strategy to construct layered membranes with high and stable proton conductivity based on sulfonated graphene oxide

Abstract

Spin coating as an easy-operation strategy to construct layered membranes has been widely mentioned in the fields of microelectronics, energy storage, and conversion, etc. In this research, the successful construction of proton exchange membranes (PEMs) bearing layered structure consisting of sulfonated graphene oxide (SGO) nanosheets and polyvinyl chloride (PVC) with the spin coating method has been demonstrated by the identification of the multilayered dispersion of components and compact structure. The hydrophilic SGO nanosheets could increase the hydrophilicity of composite membranes since they bore a large number of polar oxygen functional groups. Phosphoric acid (PA) can be combined through the formed intermolecular hydrogen bonds between PA molecules and SGO nanosheets. The content of PA in PEMs can be adjusted by controlling the concentration of PA solutions, immersion temperature, and duration time. A comparative study with the membrane from the solution casting method has been performed, expecting to understand the influence of layered structure on membrane performance. It was found that the well-ordered distribution of SGO nanosheets facilitated proton conduction, demonstrating from the proton conductivity of 3.63 Â 10 À2 S/cm at 150 C. The fine proton conductivity stability, for instance, the result of 2.71 Â 10 À2 S/cm at 140 C lasting 1000-hour supported the component stability and mechanical strength. The research revealed that the spin coating technique could provide a facile and effective strategy to construct wellordered membrane electrolytes for the application of high-temperature proton exchange membrane fuel cells.

Biomimetic Two-Dimensional Composited Membranes for Ion Separation and Desalination

“…The coating strategy is widely employed in the fabrication of layered membranes and has garnered significant attention. This technique encompasses several methodologies, including dip coating, spin coating, and spray coating, which offer versatility and ease of operation in the preparation process. , These methods rely on the attachment of solute species to a substrate through controlled solvent volatilization . He et al has implemented a sequential coating technique for the formation of highly cohesive and uniform ultrathin 2D composite membranes .…”

Using Metal-Organic Framework HKUST-1 for the Preparation of High-Conductive Hybrid Membranes Based on Multiblock Copolymers for Fuel Cells

“…This represents 6% of the total cumulative emission reductions. The development of hydrogen energy is due to the use of new nanostructured materials, for example, metal-organic frameworks, nanoparticles, carbon structures, and others [ 1 , 2 , 3 , 4 ]. Hydrogen fuel cells are clean conversion energy devices for a variety of applications, such as stationary energy sources, vehicles, and even portable devices [ 5 , 6 , 7 ].…”

Temperature‐dependent mechanical performance of Nafion® 212 proton exchange membrane under uniaxial and biaxial loading

“…Shi et al 17 reported that the damp heat aging rate significantly impacts the relaxation modulus of the Nafion® 212 membrane, with modulus values increasing over time. Jin et al 18 fabricated layered PEMs using sulfonated graphene oxide (SGO). Their study revealed that the organized arrangement of SGO nanosheets greatly enhanced proton conduction, as evidenced by a proton conductivity value of 3.63 × 10 −2 S/cm at 150°C.…”

“…Shi et al 17 reported that the damp heat aging rate significantly impacts the relaxation modulus of the Nafion ® 212 membrane, with modulus values increasing over time. Jin et al 18 fabricated layered PEMs using sulfonated graphene oxide (SGO). Their study revealed that the organized arrangement of SGO nanosheets greatly enhanced proton conduction, as evidenced by a proton conductivity value of 3.63 Â 10 À2 S/cm at 150 C. Furthermore, Zhao et al 19 prepared multilayered membranes using the vacuum-assisted flocculation method, resulting in membranes with high and stable proton conductivity even at subzero temperatures.…”