Electrochemical capacitance of nanoporous hydrous RuO2 templated by anionic surfactant

The nanoporous RuO2·3.38H2O was synthesized with a surfactant template using sodium dodecyl sulfate. The surface area of the material amounted to 220 m2 g−1 while the maximum specific capacitance obtained was 870 Fg−1 at a scan rate of 10 mV s−1. The specific capacitance of nanoporous RuO2·3.38H2O electrode exhibits enhancement, compared with other porous RuO2 materials synthesized by different methods. The nanoporous RuO2·3.38H2O is a very promising material for high performance capacitance.

► The increase of the surface area in porous nanoarchitectures is the most effective way to utilization of the pathways in the very rapid charge and discharge reactions, and the control of the hydrated contents of (RuO2·xH2O) in the porous nanoarchitectures of RuO2 is important parameter to obtain the high specific capacitance.
► In this study, we propose a new process for preparing nanoporous and hydrous RuO2, templated at isotropic micellar phase of SDS. The surface area of these materials amounted to 220 m2 g−1, which is facilitated the proton's accessibility into the electrode loaded 80 wt% as the active material. Electrochemical capacitive properties of nanoporous RuO2·0.72H2O and RuO2·0.55H2O have been characterized by means of the cyclic voltammetry.
► The proposed nanoporous RuO2·0.72H2O and RuO2·0.55H2O showed the maximum specific capacitance, i.e., 870 F g−1 and 833 Fg−1, respectively, at a scan rate of 10 mVs−1, and exhibited pure electrochemical capacitive behavior.
► Thus, it is suggested that the proposed nanoporous RuO2·0.72H2O is more suitable for high performance capacitors than other materials.