An aqueous mixture of poly(vinyl alcohol) (M.W. ∼ 8.9 × 10 4 -9.8 × 10 4 g mol −1 , 14% w/v) and disodium terephthalate (Na 2 TP) powders (6% w/v) was electrospun at 14 kV with a fiber collection distance and a feed rate of 12 cm and 0.5 mL h −1 . Then, the obtained fibers were calcined at 350 • C with a heating rate of 1 • C min −1 under air for 7 h. Diameters of hollow Na 2 TP fibers, composed of grains with sizes of 76 ± 27 nm, are 189 ± 32 nm. Na 2 TP fibers are composed of ∼16% w/w Na 2 CO 3 . Na 2 TP structure is orthorhombic and can be indexed in a space group of Pbc2 1 . Degree of crystallinity of Na 2 TP fibers is less than that of Na 2 TP powders. Galvanostatic curves display stable reversible capacities of Na 2 TP powders and fibers at ∼140 mA h g −1 and ∼110 mA h g −1 , respectively, after 50 cycles at 25.5 mA g −1 . On the other hand, at 255 mA g −1 and after 100 cycles, those of the powders and the fibers are ∼48 mA h g −1 and ∼70 mA h g −1 , respectively. Thus, the eco-friendly Na 2 TP fibers are potentially used as anode materials of sodium-ion batteries under high current density.
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