fig2

Figure 2. Structural characterization of prepared ZnO@C materials. (A) XRD patterns of commercial ZnO and H₃BTC, ZnO-H₃BTC intermediates and ZnO@C products. (B) Zn 2p and (C) C 1s spectra of ZnO@C composites. (D) TGA curve of ZnO@C under air atmosphere with a heating rate of 10 °C min^-1 from 40 to 700 °C. (E) Nitrogen adsorption-desorption isotherms and (F) corresponding pore-size distribution of ZnO@C composites. XRD: X-ray diffraction.