Fig. 1: Structural characterization of L-Cu_xO-HC.

a TEM, b STEM, and c corresponding EDX mapping images of L-Cu_xO-HC. d Spherical aberration-corrected high-resolution HAADF-STEM image. e and f are the enlarged area in d. g The line intensity profile acquired along the blue areas in d. h XRD pattern of L-Cu_xO-HC.