Fig. 6. (A) UV-vis and (B) MALDI-mass characterization of Au25(PET)18 NCs. Inset of (A): crystal structure of Au25(PET)18 NCs. (C) TEM image of CoSe2 nanosheets. (D) and (E) HAADF-STEM images of Au25/CoSe2 composite with different magnifications. (F) OER polarization curves. (G) Mass OER activity of Au25/CoSe2 composite, CoSe2, Au25 supported on carbon black (CB) and commercial Pt/CB. Panels (a)–(g) are reproduced with permission from ref. 40. Copyright 2017 American Chemical Society.
