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Figure 9. (A) HRTEM images of Cu-Co₃O₄/CuO. (B-F) high-angle annular dark field and element mapping images of Cu-Co₃O₄/CuO. (G) Cu 2p XPS spectra. (H) Co 2p XPS spectra. (I) The LSV curves in 1 M KOH with 10 mM HMF. (J) Relaxed adsorption structures of HMF on Co₃O₄, Cu-Co₃O₄, and Cu-Co₃O₄/CuO. Reproduced with permission^[105]. Copyright 2023, Springer Nature.