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(a) HRTEM images of the as-synthesized CN/Cu-5 composite catalyst. (b) Lattice fringes of Cu2O (1), g-C3N4(2), and Cu–N(3) in the CN/Cu-5 composite and d-spacing for Cu2O, g-C3N4, and Cu–N are 245.3, 330, and 370–380 pm, respectively (value averaged by selecting three fringes). (c) SAED pattern at the CN/Cu-5 interface. (d) HAADF image of the CN/Cu-5 catalyst and corresponding elemental mapping images of Cu, C, N, and O.
