This must be found experimentally, i.e., you need to synthesize different batches of Ag particles, with or without supporting, having different preferred orientation and test their catalytic activities to know which crystallographic face is the more active.

The XRD will be helpful to find the preferred orientation of the particles.

Imad Disher ，

thanks for your replying.

I think you can find a paper about the high energy active surface of Ag/CDs or calculate it through DFT.