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(a) Schematic formation mechanism of N-doped CNB (in red)/MWCNT (in gray) heterojunction in water. (b) Cryo-TEM image of the N-doped CNB/MWCNT composite in water. CNBs are found to attach to MWCNTs. Reproduced with permission from ref (31). Copyright 2014 Wiley-VCH. (c, d) SEM image and the corresponding N mapping of N-doped microporous carbon fibers derived from PCMVImTf2N-coated commercial microporous carbon fibers. Reproduced with permission from ref (32). Copyright 2017 Wiley-VCH.
