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FESEM images of pure (a) PVdF-co-HFP film and nanocomposite GPE films containing (b) 0 wt %, (c) 6 wt % Al2O3, (d) 30 wt % Al2O3, (e) 6 wt % MgAl2O4, and (f) 20 wt % MgAl2O4. Reproduced with permission from Polym. Compos., 40, Sharma et al., Magnesium ion-conducting gel polymer electrolyte nanocomposites: Effect of active and passive nanofillers, 1295–1306, 2019 [77].
