Abstract We present here a novel hybrid nano-structured manganese dioxide/activated carbon supercapacitor with lithium hydroxide electrolyte, in which the MnO2 positive material was prepared using a solid-state reaction route. The electrochemical behaviors of MnO2 electrodes in 1 M LiOH and 1M KOH electrolytes, respectively, were characterized by cyclic voltammetry and electrochemical impedanc…