Ruthenium nanoparticles-modified reduced graphene prepared by a green method for high-performance supercapacitor application in neutral electrolyte

Abstract

Here, we report a one-pot preparation of a ruthenium-based reduced graphene oxide hybrid (Runano-based RGO) for supercapacitors applications.

High performance silicon nanowires/ruthenium nanoparticles micro-supercapacitors

“…depicts the CV of Si NWs substrate recorded before and after decoration with Ru NPs for various deposition times(30, 45, 60 and 75 min) in 1 M Na 2 SO 4 at a scan rate of 1 mA cm -2 in the potential window of -0.6 to + 0.2 V. The capacitance behavior of the Ru/Si NW electrodes is obvious from the rectangular shape of the CV curves with no apparent contribution from redox processes (Faradaic pseudocapacitance), suggesting that the specific capacitance is dominated by the electrochemical double layer capacitance. This result is in accordance with that recorded for Ru nanoparticles-reduced graphene oxide[40]. The specific capacitance values, deduced from the CV curves using Eq.…”

Carbon nano-fiber forest foundation for ruthenium oxide pseudo-electrochemical capacitors

“…The capacitance reached a maximum value for the electrodes produced at 200 1C and 250 1C (835 AE 40 mF cm À2 and 822 AE 04 mF cm À2 , respectively). These values are significantly higher than those recorded on RuO 2 -CNT and RuO 2 -CNF based electrodes, [46][47][48][49][50][51] RuO 2 graphene-based 52 and other ruthenium-based electrodes. [53][54][55][56] Some of the recent results reported in the literature are shown in Table 1.…”

“…Most ruthenium-based capacitors have the disadvantage of lower capacitance (and thus also lower energy density) at higher charge/discharge currents. 31,52,72,73 However, for the RuO 2 -CNF electrodes (Fig. 9b), only a 10% decrease in the capacitance is observed at a high current density of 100 mA cm À2 when compared to the capacitance at 5 mA cm À2 .…”

Boron‐Doped Ni‐Ru Supported on Nitrogen‐Doped Ordered Mesoporous Carbon as Effective Electrocatalyst for Methanol Electrooxidation

“…The deconvoluted peaks observed at 280.8 eV and 282.3 eV correspond respectively to the Ru 3d 5/ 2 principal and satellite peaks of Ru 4 + . [33] The peaks higher than the binding energy of 283 eV, corresponding to the Ru 3d 3/2 , are found to overlap with the 1 s core peak of carbon. The deconvoluted peak obtained at 284.6 eV arises from the sp 2 hybridized carbon whereas peak due to C=O is positioned at 288.1 eV; the other observed peaks are an overlap of the 3d Ru and 1 s C (Figure 7 c).…”

“…The principal peaks are further deconvoluted to two peaks corresponding to the metallic Ru and Ru 4 + electronic state. [30,33] Besides, the characteristic doublet separation between the two principal peaks of 22.2 eV, is peculiar to the metallic and oxide form of Ru. The 3d core peak of Ru was found to partially overlap with the 1 s core peak of carbon (Figure 7 c).…”