Birnessite as Possible Candidate for Hybrid Carbon/MnO2 Electrochemical Capacitor

Abstract

Birnessite form of manganese dioxide has been investigated as possible electrode material for electrochemical supercapacitor applications. It has been shown that this material exhibits partial sodium cations/protons intercalation which provides pseudo-capacitance leading to a stable value of 145 F/g on 1100 cycles. The use of Mg-doped Na-birnessite as positive electrode of a hybrid carbon/MnO2 electrochemical supercapacitor has also shown an interesting capacitance of 0.12 F, stable on 17000 cycles.