Abstract
This work employs a simple one-step method, anodic composite deposition, to fabricate hydrous RuO 2 -TiO 2 (denoted as RuO 2 ·xH 2 O-TiO 2 ) composite films from an aqueous bath containing RuCl 3 ·xH 2 O and TiO 2 nanoflowers for the electrochemical capacitor (EC) application. The composition of composites can be simply controlled by varying the concentration of TiO 2 nanoflowers of the rutile phase in the deposition solution. The highly porous morphologies of various RuO 2 ·xH 2 O-TiO 2 composites are characterized with a field emission scanning electron microscope (FE-SEM). The pseudocapacitive performances (e.g., electrochemical reversibility, specific capacitance, electrochemical impedance spectroscopic responses) of relatively thick RuO 2 ·xH 2 O-TiO 2 composites (0.9 ± 0.1 mg cm -2 ) are systematically investigated. The high-power capacitive behavior of RuO 2 ·xH 2 O-TiO 2 composites, high utilization of RuO 2 ·xH 2 O and the simple one-step method for electrode preparation indicate the unique merits of anodic composite deposition. © 2012 Elsevier Ltd.