the BET surface area of Co/ZnO samples decreases while the pore volume increases compared with those of ZnO . The decrease of SBET could be caused by the incorporation of Co particles inside ZnO pores. However, that seems contradictory with the change in Vpore. How to explain the discrepancy between the two sets of data? Besides, the SBET of my ZnOs is significantly lower than literature data.
Thank you for help
Try checking the pore size distribution as well.. They play an important role in the surface area/pore volume relation.. You have to check if the amount of Co is enough for blocking your pores as well, you didn't mention annealing conditions, but if you do, the morphological changes at your material can also be related to annealing effects in presence of "contaminants".
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