The sensor 4, wherein the species sensing electrode portion is doped with {HEAD ~ a material} selected from the group consisting of Ce, Pb, Ag, Mn, Mo, W, Ca, Li, Na, K, Cs, Zr, Ge, Sb, {TAIL ~ Mg}, Sr, Sc, Ti, Nb, Fe, Co, Ni, Cu, Rh, Pd, Ga, In, and Sn, and mixtures and combinations thereof 
The sensor 4 , wherein the species sensing electrode portion is doped with { HEAD ~ a material } selected from the group consisting of Ce , Pb , Ag , Mn , Mo , W , Ca , Li , Na , K , Cs , Zr , Ge , Sb , { TAIL ~ Mg } , Sr , Sc , Ti , Nb , Fe , Co , Ni , Cu , Rh , Pd , Ga , In , and Sn , and mixtures and combinations thereof
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