Development of nano-spherical RuO2 active material on AISI 317 steel substrate via pulse electrodeposition for supercapacitors

• To develop a RuO2 thin film material via pulse deposition on Ni flashed AISI 317 steel for supercapacitors
• The specific capacitance value is approximately 520 F g− 1 at the scan rate of 1 mV s− 1.
• The RuO2 particles are nano sized ranging at lower than 500 nm dispersed on Ni strike SS substrate.
• The impedance and CV results also exhibit good resistance as well as broad oxidation and reduction reaction peaks.

The goal of the present study is to develop a thin film hydrous ruthenium oxide (RuO2) electrode material on Ni flashed AISI 317 stainless steel (SS) substrate by pulse electrodeposition (PED) technique for application in supercapacitors. The nickel (Ni) strike thin film is deposited prior to RuO2 in order to improve the adhesion of the active material on the SS substrate. The prepared RuO2 active material on Ni strike SS electrode is characterized using XRD, SEM with EDAX and electrochemically using cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) using an IVIUM reference potentiostat. The surface morphologies of the thin film (thickness of 2.3 μm) active materials are nano-spherical shaped and the particles are arranged uniformly without cracks on the SS substrate. The electrochemical impedance and CV profile demonstrates its superior characteristics in the electrochemical system. Moreover, the specific capacitance of RuO2 value is approximately 520 F g− 1 at the scan rate of 1 mV s− 1 and it's indicating a better utilization of active species in supercapacitors.