Fig. 1: Graphene-covered non-noble metal catalysts and graphene characterization. | Nature Communications

Fig. 1: Graphene-covered non-noble metal catalysts and graphene characterization.

From: Catalytic activity of graphene-covered non-noble metals governed by proton penetration in electrochemical hydrogen evolution reaction

Fig. 1

a Schematic diagram of a graphene-covered Cu or Ni sheet. HRTEM images of (b) 1GL and (c) 1NGL. Inset of (b): the corresponding fast Fourier transform (FFT) image. Inset of (c): the atomic model of the structural defect, highlighted by red marks. Raman maps of (d) 1GL and (e) 1NGL performed on a window-attached Si3N4 chip. The dotted square indicates the window area. f, g Raman spectra were collected at the positions indicated on the corresponding maps. The I2D/IG values provide evidence that monolayer graphene dominates. Scale bars: (b) 1 nm; (c) 0.5 nm; (d, e) 5 μm.

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