Using a microwave-assisted path, MnO2 structures were prepared to be used as catalyst material in room-temperature-operated sodium-air cells. The electrochemical cells are prepared using a dry coating step (Laser Induced Forward Transfer), i.e. without organic solvents. Due to a novel formulation for an electrolyte, the electrochemical stability and performance of as-prepared electrodes is very high (1215 Ah/kg specific charge).