Fig. 1From: Carbon and Binder-Free Air Electrodes Composed of Co3O4 Nanofibers for Li-Air Batteries with Enhanced Cyclic Performance a–c SEM images of the standard electrode composed of Ketjen black (90 wt.%) and a PVDF binder (10 wt.%). d–f SEM images of the Co3O4 nanofibers grown on a Ni meshBack to article page