Synthesis of clay‐armored coatable sulfonated polyimide nanocomposites as robust polyelectrolyte membranes

Abstract

Herein, coatable sulfonated polyimide (SPI) and clay-reinforced SPI membranes SPI-clay 3%, SPI-clay 5%, and SPI-clay 7% were successfully fabricated by one-step high temperature via direct imidization method. The membranes were cast as a coatable thin film using a solution casting method and grafted vermiculite clay nanoparticle were incorporated into the neat SPI as reinforcement by the sonication method. Three different formulated nanocomposite membranes were investigated using different characterization techniques such as Fourier transform infrared spectroscopy as peaks at 1166 and 1227 cm À1 confirmed successful sulfonation. In Proton ( 1 H) NMR synthesis of SPI confirmed as aromatic proton at 7.3-8.8 ppm depicts successful sulfonation and X-ray diffraction results confirmed the crystalline structure of clay, as its content increased (7%) clear diffraction peak arises at 6 and 25 . Scanning electron microscopy (SEM) provides information about surface morphology of clay reinforced SPI membranes, and SEM micrographs shown uniform dispersion of clay nanofillers and developed easy transfer of electron. Thermogravimetric analysis was performed to investigate the thermal stability of synthesized films, results of thermographs shown degradation in the range of 510-600 C. Different physicochemical parameters employed and their results show the effectiveness of synthesized clay reinforced SPI membranes. Water uptake (WU%) about 0.96%, hydrolytic about 98 h and oxidative stability up to 80 C, ions exchange capacity about 3.16 mmol/g for synthesized clay reinforced SPI membranes. Measurement regarding Dimensional changes was also investigated and dimensional changes (1.557 Δt/Δl). All these results reveal that the clay-reinforced coatable SPI membranes are a promising material for polymer electrolyte membranes to be used in fuel cell energy applications.

Negatively Charged Laponite Sheets Enhanced Solid Polymer Electrolytes for Long-Cycling Lithium-Metal Batteries

“…However, the instability and poor processability of nanosheets remain the limit for their application. Clay materials attract extensive attentions in the field of hydrogels and electrolytes because of their large specific surface, unique physical and chemical adsorption functions, and environmental friendliness. − Lithium magnesium silicate (synthetic laponite) is a kind of clay with a layered structure composed of octahedral sheets sandwiched between two silica tetrahedral sheets, which has been investigated in batteries due to its unique chemical stability, good mechanical strength, environmental friendliness, and low cost . Through a simple ultrasonic stripping method, ultrathin laponite sheets (LSs) with large and negatively charged surfaces can be prepared, − which is an ideal inorganic filler to efficiently enhance the ionic conductivity, mechanical strength, thermal stability, and electrochemical performance of solid composite electrolytes.…”