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Porous nanofibers comprising of Fe@ZIF‐67‐derived dual‐phase Co3O4/Fe3O4 hollow nanospheres and N‐doped graphitic C (N‐GC) are prepared for high‐performance lithium‐ion battery anodes. Optimized ZIFs containing both Co and Fe ion nodes (Fe@ZIF‐67) are prepared by the supplementation of additional Fe salt in the precursor solution of ZIF‐67. The size of Fe@ZIF‐67 is controlled by adjusting the pH value...
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