The present invention relates to a coating composition comprising: IO to 80 wt% of cerium oxide comprising a dopant based upon the total weight of the composition, wherein said dopant is selected from iron oxide, cobalt oxide, chromium oxide, lanthanum oxide, or mixtures thereof, and the atomic ratio of dopant metal to cerium is in the range 0.01:l to 0.5:l; and IO to 50 wt% of binder based upon the total weight of the composition
