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Abstract

A working electrode for an electrochemical reactor, the electrochemical reactor comprising a working electrode, a counter electrode, and an ion-selective electrolyte; the working electrode comprising an electric conductive ceramic oxide material having the general formula: A.sub.2A'.sub.(1-x)B.sub.yB'.sub.(1-y)O.sub.(3-.DELTA.) wherein A and A' designate first substitution metals of similar sizes, said first substitution metals having a high efficiency for reducing vacancies for oxygen ions, 0.ltoreq.x.ltoreq.1; B and B' designate second substitution metals of similar sizes, said second substitution metals being of smaller sizes, said second substitution metals being of smaller sizes than those of said first substitution metals, and having a high transition efficiency between oxidation states, 0.ltoreq.y.ltoreq.1; O designates oxygen; and .DELTA. is a small number, positive or negative, that allows for compensation of differences in valences of said metals. An electrochemical reactor comprising said working electrode. Methods and an electrochemical reactor for reduction of nitrogen oxides in a mixture og nitrogen oxides and oxygen, the electrochemical reactor comprising a working electrode, a counter electrode, an ion-selective electrolyte, and a nitrogen absorber for absorbing nitrogen oxides; wherein said nitrogen absorber is adapted for electrochemical regeneration thereof.

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