In this paper, interaction of the air plasma generated in an atmospheric pressure pin-to-solution electrical discharge with aqueous solutions of silver nitrate, copper nitrate and also their mixture is experimentally investigated in the cathode-plasma electrolysis configuration. Experiments show that a black (green–blue) powder is obtained for pure solution of AgNO3(Cu(NO3)2⋅3H2O). Through X-ray diffraction (XRD) characterizations, the black (green–blue) powder is found to be Ag2O2(Cu2(OH)3NO3). On the other hand, the electrolysis product for AgNO3/Cu(NO3)2⋅3H2O mixture solution is a black–brown powder. XRD and EDS analyses of the powder along with its FESEM images reveal that it is truly Cu2(OH)3NO3 micro-plates covered sparsely with Ag7NO11 nanoparticles of diameter ∼30 nm.
