Fig. 2From: Catalytic core–shell nanoparticles with self-supplied calcium and H2O2 to enable combinational tumor inhibitiona Schematic illustration of the synthesis procedure of CaO2@Co-Fc. b SEM image of CaO2. c SEM image of CaO2@Co-Fc. d TEM image of CaO2@Co-Fc. e XPS survey spectra of CaO2@Co-Fc. f Size distribution of CaO2and CaO2@Co-Fc. g Zeta potential of CaO2 and CaO2@Co-FcBack to article page