fig7
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Figure 7. (A) (i) and (ii) Schematic illustration of the synthesis process of the Se@PCNFs electrode; (iii) Photograph of free-standing and flexible Se@PCNFs electrode; (iv) Long-term cycling performance of Se@PCNFs electrode in Li-ion batteries at 0.5 A g-1 for 900 cycles[103]; Copyright 2015, Wiley-VCH. (B) (i) Digital photo of the flexible self-standing graphene-Se@CNT composite film;