Patent ID: 7153402

Claim:
A NOx-decomposing electrode for decomposing or reducing NOx, in which oxygen is produced by decomposing NOx by said electrode, said NOx-decomposing electrode having a multilayered structure comprising a plurality of cermet electrode layers each of which includes an alloy of Pt—Rh and a ceramic component, wherein said respective cermet electrode layers are formed on a ceramic substrate, and said respective cermet electrode layers having different ratios between Pt and Rh in said alloys of Pt—Rh, wherein among proportions of Pt in said respective cermet electrode layers, a proportion of Pt is minimum in said cermet electrode layer formed at a central portion of said NOx-decomposing electrode and a proportion of Pt is maximum in said cermet electrode layer formed at a circumferential edge of said NOx-decomposing electrode.