In this talk, we will present the synthesis of free-standing, stable Au_1-xAg_x alloy nanowire networks with controlled morphology and atomic composition, by ion-track nanotechnology and electrodeposition. The fabrication process employs irradiation of polycarbonate foils with heavy ions from four directions with 1-2 GeV Au ions at the UNILAC accelerator of GSI. Followed by chemical track etching of the ion tracks results in templates with interconnecting nanochannels which are then filled with alloyed gold and silver by potentiostatic electrodeposition. Nanowire growth rate and atomic composition are tuned by varying the deposition potential and the electrolyte composition. The technique provides precise control of the nanowire size, interconnectivity, and composition. The 3D network exhibit surface areas up to 300 times larger than their planar counterpart, making them highly interesting for catalytic processes. The electrochemically active surface area (ECSA) was determined by measuring the double-layer capacitance of the nanowire network surface, which is in good agreement with the calculated theoretical surface area. Then we measured the cyclic voltammetry (CV) response of different composition Au_1-xAg_x nanowire networks in 0.1 M KOH electrolyte, which acted as a working electrode, to measure their electrochemical activity in an alkaline solution.