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Fig. 2. (a) Powder X-ray diffraction patterns of the simulated and as-synthesized ZnCo2O4, (b) EDX of the ZnCo2O4 micro-rice structure, (c) N2 adsorption/desorption isothermal curve and pore size distribution of the ZnCo2O4 micro-nano structure, high-resolution XPS spectrum of (d) Zn 2p, (e) Co 2p, (f) O 1s.