Abstract
Microwave-assisted hydrothermal (MAH) route has been demonstrated as a powerful method for rapid synthesis of RuO 2 ·x H 2 O-TiO 2 nanocomposites with ideal capacitive behavior. From high resolution transmission electron microscopic and element mapping images, anatase TiO 2 crystallites are formed before RuO 2 ·x H 2 O nucleation under the MAH environment, enhancing the exposure and utilization of RuO 2 ·x H 2 O. RuO 2 -based specific capacitance reaches the maximum, 992 F g -1 estimated from cyclic voltammetries measured at 100 mV s -1 , when 60 RuO 2 ·x H 2 O-40 TiO 2 is annealed in air at 150°C for 2 h, achieving the high power and high capacitance purposes. © 2010 The Electrochemical Society.