Three-Dimensional Graphene-Based Nanomaterials as Electrocatalysts for Oxygen Reduction Reaction

Figure 1

(a, b) Photographs of an as-prepared superlight GF and one with a piece of GF size of 1.8 cm × 1.1 cm × 1.2 cm standing on a dandelion. (c, d) SEM images of the sample in (a). (e, f) Typical TEM images of the walls of GF and the corresponding electron diffraction patterns consistent with 1–4 crystalline graphene layers (reprinted from [41]; copyright 2012 WILEY-VCH).

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