| 초록 |
Proton conducting and water-swellable perfluoronated sulfonic-acid ionomers (PFSAs) are of great interest as polymer electrolyte membranes for various energy related applications and actuators. Here, we utilize directional anisotropy in diffusion and swelling upon stretching, due to the aligned water channels of PFSA along the deformation direction, for vanadium redox flow battery (VRFB), polymer electrolyte membrane water electrolysis (PEMWE), and actuators. For both applications of VRFB and PEMWE, the thinned membranes show the enhanced cell performance with the enhanced barrier properties to vanadium ions and hydrogen gas, respectively. This simple pretreatment of membranes offers an effective and facile way to overcome the conventional concerns on PFSA membranes. Also, a bilayer composed of two uniaxially stretched PFSA membranes with perpendicular orientation was used to demonstrate humidity sensitive 3D structures and bistable self-folding structures. |
