Graphene Oxide as an Efficient Hybridization Matrix for Exploring Electrochemical Activity of Two-Dimensional Cobalt-Chromium-Layered Double Hydroxide-Based Nanohybrids

Abstract

Two-dimensional graphene oxide (GO) nanosheets with high electrical conductivity and electrochemical stability are employed as a hybridization matrix to improve the electrode performance of layered double hydroxides (LDHs). A cobaltchromium-LDH hybridized with a GO matrix leads to anchored Co-Cr-LDH-GO (CCG) self-assembly with a high surface area, mesoporous morphology, high electrical conductivity, and high charge transfer kinetics. The CCG nanohybrids display enhanced specific capacity (1502 C g −1 ) with high-rate characteristics compared to pristine Co-Cr-LDH (591 C g −1 ), signifying the crucial role of GO as a hybridization matrix for improving the electrode performance of LDH materials. Aqueous and all-solid-state hybrid supercapacitors are fabricated using the best-optimized CCG nanohybrid and reduced graphene oxide as an anode and a cathode, respectively. The aqueous device delivers a specific capacitance of 181 F g −1 , a specific energy (SE) of 56.66 Wh kg −1 , and a specific power (SP) of 600 W kg −1 at 0.8 A g −1 . Moreover, the solid-state device delivers a specific capacitance of 130.8 F g −1 , a SE of 46.50 Wh kg −1 , and a SP of 1536 W kg −1 at 1.92 A g −1 . The present study clearly demonstrates the usefulness of conducting GO as an efficient hybridization matrix to improve the electrode performance of LDHs.

Self-assembled polyoxovanadate-intercalated layered double hydroxide nanosheets hybridized with graphene oxide for extrinsic supercapacitors

“…The reference GO sample had two distinct peaks at 1340 and 1600 cm −1 , which were assigned to the D (the breathing mode of A 1g symmetry) and G vibration bands (the E 1g symmetry of SP 2 -bonded carbon atoms) of GO, respectively. 31 Two Raman peaks corresponding to the E g and A 1g vibrational modes of Ni(OH) 2 were also discernible at n 1 (311 cm −1 ) and n 2 (464 cm −1 ), respectively, for the pristine NC-LDH sample. 32 This sample also exhibited an intense and broad Raman peak at n 3 (540 cm −1 ), which was attributed to the superposition of the bending mode of Cr(OH) 3 and the second-order acoustic mode of Ni(OH) 2 .…”

Ultralong-Cycling and Free-Standing Carboxylated Graphene/PEDOT:PSS Films as Electrode for Flexible Supercapacitors

“…The characteristic peaks at 1734, 1632, and 1387 cm -1 of CG can be seen, which correspond to the carboxyl group C=O, stretching vibrations corresponding to C = C and − COO− bending vibration, respectively, confirming that CG contained carboxylic and carbon-carbon double bond, respectively. [26,33] For the PEDOT:PSS film, there are two obvious characteristic peaks at 1632 cm -1 (C = C alkane stretching vibration peak) and 1502 cm -1 (C = C aromatic stretching vibration peak), respectively. Moreover, the peaks at 1174 and 683 cm -1 are ascribed to the C − S stretching vibrations on the PSS ring.…”

Metallic 1T′-MoTe2 Nanoparticle-Incorporated Graphene for Enhanced High Current Hydrogen Evolution and Supercapacitor Performance

“…To exert its inherent advantages, incorporating the other conductor with a similar dimensional structure is a feasible strategy. Reduced graphene oxide (rGO), a star two-dimensional carbon with high specific surface area and efficient electron transport, has been confirmed as an applicable conductive carrier. , For example, Yang et al prepared an ultrathin MoS 2 array composite with a hollow rGO sphere (h-rGO@MoS 2 ) through a three-step method using spherical SiO 2 as a template. Resulting from the synergistic relationship between MoS 2 and rGO, the composite structure shows good HER and supercapacitor performance.…”

“…Reduced graphene oxide (rGO), a star two-dimensional carbon with high specific surface area and efficient electron transport, has been confirmed as an applicable conductive carrier. 26,27 For example, Yang et al 28 prepared an ultrathin MoS 2 array composite with a hollow rGO sphere (h-rGO@MoS 2 ) through a three-step method using spherical SiO 2 as a template.…”