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Fig. 2. TEM images of CaO2 nanoparticles (a) and CaO2/B1/NH4HCO3 lipo (c); XRD patterns of CaO2/B1/NH4HCO3 lipo before (b) and after heating to 45 °C (d); insets show TEM images of CaO2/B1/NH4HCO3 lipo before and after heating to 45 °C, respectively.