In this investigation, manganese oxide electrodes that incorporate selectively micro-etched duplex stainless steel (DSS) for supercapacitor applications were fabricated. The experimental results demonstrate that selective dissolution of the gamma phase could result in the formation of alpha phase network, and vice versa. Controlling the extent of selective dissolution produces a surface with a concave-convex morphology, increasing the Surface area. Manganese oxide could then be anodically deposited onto the etched dual phase steel Current collector. The experimental results of cyclic voltammetry (CV) show that the specific capacitance increased with the etching depth of either the gamma or the alpha phase. Additionally, selective dissolution Occurred in alpha phase had a better effect on increasing the specific capacitance. The Successful application of selective dissolution in fabricating a current collector was thus demonstrated. (C) 2008 Elsevier B.V. All rights reserved.