binding energy of Pd and CeO2(1 1 0) greater than 0

[zhang yipu]

Hello all,

 I put the Pd single atom on the CeO2 (1 1 0) and (1 1 1) surface to calculate the binding energy (Ebind = Etotal - Epd - Eslab, where Epd is the total energy of a free pd single atom). The binding energy when pd supported on (1 1 1) surface is similar to the ref but the pd on the (1 1 0) surface is greater than 0 ( the bind length is similar to ref). 

I also calculate the oxygen formation energy of clean (1 1 0) and (1 1 1) furface , the energy obviously lower than ref (for example , the Eov I calculated was 1.26 eV , the ref about 2 eV)

I guess there are something wrong in my input file, but I don't know what goes wrong.

Any help would be appreciated!!!

Zhang yipu