Figure 7

IR thermal camera images of (a) Gr, (b) Ni@Gr, (c) Cu/Ni@Gr, and (d) Cu@Gr at 10 V, 1 min, and (e) digital photo of the test configuration.

IR thermal camera images of (a) Gr, (b) Ni@Gr, (c) Cu/Ni@Gr, and (d) Cu@Gr at 10 V, 1 min, and (e) digital photo of the test configuration.