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Morphological characterizations of hybrid sponges: a–c) SEM images of CNT/Co3O4, CNT/CoSe2, and CNT/CoSe2/C, respectively. TEM images of d,g) CNT/Co3O4, e,h) CNT/CoSe2, and f,i) CNT/CoSe2/C showing diameter of outer carbon layer of ≈4.0 nm.
