Abstract: The present invention applies the fundamental electrochemical NEMCA effect (Non-Faradaic Electrochemical Modification of Catalytic Activity), to the treatment of the automotive exhaust. A solid electrolyte layer is sandwiched between a conductive catalyst layer and the underlying metal honeycomb multichannel supporting structure forming the exhaust treatment device. Electric current is applied between the catalyst layer and the metallic structure resulting in an increase of catalytic activity of the catalyst. The exhaust stream is passing through the multichannel honeycomb structure and is catalytically treated with increased efficiency.