fig13

Figure 13. (A) Temperature of Co_xO_y-Ru bimetallic intimacy for Co reduction. (B) The primary and secondary hydrogen spillover. In situ PXRD profiles of (C) CoRu/MHCS and (D) Ru@MHCS@Co under reduction conditions. [Co₃O₄ (*), CoO (∀), α-Co (∞), β-Co (α)]. Reproduced with permission from Ref.^[124]. Copyright 2017, American Chemical Society. PXRD: Powder X-ray diffraction; MHCS: mesoporous hollow carbon spheres.