fig4

Figure 4. (A) Synthesis of Cu₂O NPs by the reductant-controlling method and Cu₂O@ZIF-8 composites; (B) HAADF-STEM image and elemental mappings. (Reproduced with permission^[66]. Copyright 2022, Wiley-VCH GmbH); (C) Scheme, SEM, and enlarged HAADF-STEM images of P-Cu₂O-140, P-Cu₂O-240, and P-Cu₂O-340; (D) Water contact angle (CA) of P-Cu₂O-140, P-Cu₂O-240, P-Cu₂O-340 (from top to bottom); (E) FEs for C₂₊ products under different applied current densities over porous Cu₂O samples. (Reproduced with permission^[69]. Copyright 2024, American Chemical Society). NPs: Nanoparticles; HAADF-STEM: High-angle annular dark-field scanning transmission electron microscopy; FE: Faraday efficiency.