Recent progress on manganese dioxide based supercapacitors

摘要

The increasing worldwide interest in MnO_2 for supercapacitor applications is based on anticipation that MnO_2-based high-voltage aqueous supercapacitors will ultimately serve as a safe and low-cost alternative to state-of-the-art commercial organic-based electrochemical double-layer capacitors or RuO_2-based acid systems. In this paper, the physicochemical features, synthesis methods, and charge storage mechanism of MnO_2 as well as the current status of MnO_2-based supercapacitors are summarized and discussed in detail. The future opportunities and challenges related to MnO_2-based supercapacitors have also been proposed.