Fig. 5: Ex situ TEM measurements of the Se@C-based electrode.
From: Enabling fast-charging selenium-based aqueous batteries via conversion reaction with copper ions
The low-resolution TEM images, corresponding element mapping images, and atomic ratio of (a–c, m) CuSe, (d–f, n) Cu3Se2, (g–i, o) Cu2-xSe, and (j–l, p) Cu2Se; Error bars represent the standard deviation of different experiments. The atomic ratio high-resolution TEM images and corresponding Fast Fourier transform (FFT) patterns of (q, u) CuSe, (r, v) Cu3Se2, (s, w) Cu2-xSe, and (t, x) Cu2Se, respectively. The scale bars are 100 nm in Fig. 5a, d, g, j, and 1 nm in 5q, r, s, t.
