A highly conductive porous graphene electrode prepared via in situ reduction of graphene oxide using Cu nanoparticles for the fabrication of high performance supercapacitors

Abstract

Herein, a new graphene/Cu nanoparticle composite was prepared via the in-situ reduction of GO in the presence of Cu nanoparticle and was then utilized as a sacrificing template for the formation of flexible and porous graphene capacitor electrode by the dissolution of the intercalated Cu nanoparticle in a mixed solution of FeCl3 and HCl. The porous RGO electrode was characterized by atomic force microscopy (AFM), Fourier transform infrared (FTIR) spectra, X-ray diffraction (XRD), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS) and thermo gravimetric analysis (TGA). The asprepared graphene/Cu nanoparticle composite and the pure graphene film after removal of Cu nanoparticles possessed high conductivity of 3.1 × 10 3 S m -1 and 436 S m -1 respectively. The porous RGO can be used as the electrode for the fabrication of supercapacitors with high gravimetric specific capacitances up to 146 F g -1 , good rate-capability and satisfactory electrochemical stability. This environmental friendly and efficient approach to fabricating porous graphene nanostructures could envision enormous potential applications in the field of energy storage and nanotechnology.

Influences of copper–potassium ion exchange process on the optical bandgaps and spectroscopic properties of Cr3+/Yb3+ co-doped in lanthanum aluminosilicate glasses

“…Based on these results, we can confirm the existence of both Cu + and Cu 2+ ions in the SALBK glasses, corresponding to the XPS major peaks at 932.39 eV and 934.91 eV. 49–52 …”

“…Based on these results, we can conrm the existence of both Cu + and Cu 2+ ions in the SALBK glasses, corresponding to the XPS major peaks at 932.39 eV and 934.91 eV. [49][50][51][52] In Fig. 6, we present the visible emission spectra under excitation 343 nm of all these glass samples with two peaks at about 488 and 653 nm, which are assigned to the 2 T 2 / 4 A 2g and 4 T 2g ( 4 F) / 4 A 2g transitions of Cr 3+ .…”

Study of interface chemistry between the carrier-transporting layers and their influences on the stability and performance of organic solar cells

“…5a-m. Figure 5a-c (Wang et al 2014;Zhang et al 2015). As, the XPS analysis shows only non-oxygenated carbon peak for pristine carbon, but here because of the chemical interactions of the carbon with the oxygen and sulfur on the surface of each CTL, therefore, the epoxy/ hydroxyl groups, carbon sulfur and carbonyl groups peaks were also observed in the C1s spectra of PCBM, GO and their composite, respectively.…”

Visible Light-Driven Mn-MoS2/rGO Composite Photocatalysts for the Photocatalytic Degradation of Rhodamine B

“…e C1s XPS spectrum in Figure 3(d) can be split into four peaks, in which peaks at 284.8, 285.7, 287.9, and 288.9 eV are attributed to the C-C/C�C, C-S/C-O, C�O, and O-C�O bonds, respectively, for functional groups in the rGO [37] and from C-S bonds [38].…”