Facile synthesis of exfoliated Co–Al LDH–carbon nanotube composites with high performance as supercapacitor electrodes

Abstract

A novel sandwich-like structured Co-Al LDH-Carbon Nanotube (CNT) composite has been successfully synthesized by the elegant combination between exfoliated Co-Al LDH nanosheets and modified CNTs, which was achieved through an electrostatic assembly method. It is worth noting that the negatively charged CNTs, sandwiched between the positively charged nanosheets via the electrostatic force, can not only expand the area of contact of electrolyte ions but also highly improve the conductivity. The as-prepared Co-Al LDHs-CNTs composite exhibited a high specific capacitance of 884 F g(-1) and a good cycle stability over 2000 cycles. Therefore, such a facile synthetic route to fabricate the layered structure composite may open a new strategy to prepare other composites with largely enhanced electrochemical properties, which can be of great promise in energy storage device application.

Electrochemical measurements of 1D/2D/3DNi-Co bi-phase mesoporous nanohybrids synthesized using free-template hydrothermal method

“…Sun et al [42] due to the fact that the redox potential of Co(OH) 2 to CoOOH transition, is more negative than that of Ni(OH) 2 to NiOOH transition. So, comparing these CV curves which correspond to different Ni/Co ratio based bi-phase nanohybrids, the major anodic peak shifts to a more positive potential as Ni content increases in the products, as reported in [43]. By introducing more Co content into the Ni based system, the redox couples could be shifted to lower potential, preventing the solvent oxidation which induced the performance degradation [42].…”

Phase control of 2D binary hydroxides nanosheets via controlling-release strategy for enhanced oxygen evolution reaction and supercapacitor performances

“…S3c). Satellite peaks appear at a relatively high binding energy position, which correspond to the characteristic peaks of Co 2 + [41] . The peaks at 780.4 and 795.6 eV are ascribed to Co 3 + .…”

Sandwich-structured MnO2@N-doped Carbon@MnO2 nanotubes for high-performance supercapacitors

“…NCNTs is still kept after hydrothermal reaction with KMnO 4 . Surface area and pore-size distribution are two influence factors for the properties of a supercapacitor [40][41][42]. Fig.…”

“…5C) can be resolved into three components centered at 398.6, 399.8, and 400.3 eV, corresponding to pyridinic (N-6), quaternary (N-Q), and graphitic types of nitrogen, respectively[37,38] [39]. It is reported that the nitrogen atoms can improve the wettability of active materials in the electrolyte and thus favor the ion transport[40]. Moreover, the presence of N-Q and N-6 is beneficial to the conductivity and extra pseudocapacitance of carbon materials[41].…”