Ultrahigh specific capacitance of spray deposited nanoporous interconnected ruthenium oxide electrode fabric for supercharged capacitor

Abstract

In present work, nanoporous interconnected ruthenium oxide electrode fabric have been designed and prepared successfully by spray pyrolysis technique on thin stainless steel substrates via aqueous route. X-ray diffraction analysis gives amorphous nature of the prepared sample. The existence of non-covalent interactions between ruthenium and oxygen was confirmed by Fourier transform infrared spectroscopy. The elemental analysis was observed by using elemental dispersive spectrum and X-ray photoelectron spectroscopy. Morphological analysis of the ruthenium oxide fabric revealed the nanoporous granular interconnected architecture, producing high specific surface area and good electronic or ionic conducing path. The use of nanoporous interconnected ruthenium oxide electrode fabric is as free-standing electrodes for supercharged capacitor, which offers excellent ability of ultrahigh specific capacitance 1429 F g−1 at scan rate 1 mV s−1, higher energy density 172 Wh kg−1, power density 320 KW kg−1 and columbic efficiency is 94.74% in 1 M KOH. Also it exhibits very low charge transfer resistance (0.89 Ω) and relatively excellent cycle stability at scan rate 100 mV s−1 for 3000 cycles, which concluded that it has a potential application as a supercharged capacitor electrode fabric.