Rational design of honeycomb Ni-Co LDH/graphene composite for remarkable supercapacitor via ultrafast microwave synthesis

Graphene Quantum Dots Pinned on Nanosheets‐Assembled NiCo‐LDH Hollow Micro‐Tunnels: Toward High‐Performance Pouch‐Type Supercapacitor via the Regulated Electron Localization

“…Figure 3e records a nearly 86.2% capacitive retention for GQDs@LDH-2 electrode after 8000 cycles at a high scan rate of 50 mV s −1 , which is much higher than that of bare NiCo-LDH (67.8%) and other previously reported NiCo-LDH based materials (see in Figure 3f), including CoSx/Ni-Co LDH (nanosheets, 1562 F g −1 at 1 A g −1 and 76.6% after 5000 cycles), [40] MnO 2 @NiCo-LDH/ CoS 2 (nanocages, 1547 F g −1 at 1 A g −1 and 82.3% after 2000 cycles), [41] (NiCo-LDH)SHH (micro-flowers, 1765 F g −1 at 1 A g −1 and 86% after 5000 cycles), [42] CoSx@NiCo-LDH (nanocubes, 1700 F g −1 at 1 A g −1 and 80% after 3000 cycles), [43] MnO 2 @ NiCo-LDH (core-shell heterostructure, 1287 F g −1 at 1 A g −1 and 82.3% after 2000 cycles), [44] NiCo-LDH@GNSs (nanoscrolls, 1470 F g −1 at 1 A g −1 and 81.6% after 1000 cycles), [45] His-GQD/LDH (flower balls, 1372 F g −1 at 1 A g −1 and 82.3% after 2000 cycles), [46] and Ni-Co LDH/G (honeycomb, 1260 F g −1 at 1 A g −1 and 76.6% after 5000 cycles). [47] The exceptional cyclic stability of the GQDs@LDH-2 electrode is ascribed to follows:…”

A VO3−-induced S2−-exchange strategy to controllably construct a sub-nano-sulfide-functionalized layered double hydroxide for an enhanced supercapacitor performance

“…2(c), the S-CNV-LDH nanocages present a larger specific surface area of 96.4 m 2 g À1 compared with the V-CN-LDH nanocages (90.2 m 2 g À1 ) and most reported LDH and sulfide nanomaterials. 60,61 In order to investigate the electrochemical performance of the as-prepared materials, a three-electrode test was employed using Hg/HgO as the reference electrode and a platinum as the counter electrode in 6 M KOH aqueous electrolyte. The CV and GCD curves of S-CNV-LDH, V-CN-LDH (without the S 2À ionexchange process), S-CN-LDH (without the NaVO 3 etching process), and S-CoV-LDH (without the Ni(NO 3 ) 2 etching process) are shown in Fig.…”

“…2(c), the S-CNV-LDH nanocages present a larger specific surface area of 96.4 m 2 g −1 compared with the V-CN-LDH nanocages (90.2 m 2 g −1 ) and most reported LDH and sulfide nanomaterials. 60,61…”

Morphological evolution of carnation flower-like Cu2CoSnS4 battery-type electrodes

“…Composite materials are designed to achieve functional capabilities beyond the limits of each property such as energy density and lifetime. The production of new materials is essential to develop and improve power transmission and storage systems to meet the extreme energy needs of the growing low carbon economy [15][16][17]. Mesoporous materials have the potential to store high charges in energy storage owing to extensive surface area and pores.…”

“…The production of new materials is essential to develop and improve power transmission and storage systems to meet the extreme energy needs of the growing low-carbon economy. 15–17 Mesoporous materials have the potential to store high charges for energy storage owing to their extensive surface area and pores. Due to this reason, their basic properties, such as material stability, specific capacitance, energy, strength, and longevity, are also improved.…”