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Electrochemical capacitors are new storing energy systems between batteries and conventional capacitors. Recently, the research of new electrode materials is becoming one of key points in supercapacitors field. Specially, much work has been done on synthesis of nanoscale- MnO₂/carbon-based composite materials as supercapacitor electrode. In this paper, nanostructured MnO₂ in situ being grown on actived carbon fiber cloth (ACFC) was obtained without any other oxidant or reductant addition in a typical microwave hydrothermal synthesis procedure by using potassium permanganate (KMnO₄). The carbon fiber cloth here serves as not only a sacrificial reductant but also the substrate material to guarantee MnO₂ deposition. The results show that different synthesis conditions have great influence on morphology and structure of MnO₂ grown on ACFC. Highly ordered grass-blade-like δ-MnO₂/ACFC hybrid nanocomposites were synthesized at 70℃ for 60min. Those grass-blade-like δ-MnO₂ are about 500nm in length and 10 nm in depth, furthermore, they are very well-proportioned grown on ACFC. The combine of ACFC and MnO₂ is very tight, and this will solve the poor toughness of manganese oxide that lead to the easily falling off from the current collector.

supercapacitor electrode materials; microwave hydrothermal synthesis; MnO2; ACFC;