Staggered nickel–vanadium layered double hydroxide nanosheets on reduced graphene oxide via in-situ growth for enhanced supercapacitor performance

• Published in: Journal of alloys and compounds Vol. 935; p. 168048
• Main Authors: Zhang, Qingcheng, Xu, Yanqi, Li, Cunjun, Chen, Wei, Zhu, Wenfeng, Wang, Linjiang
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.02.2023
• Subjects: In-situ growth; Layered double hydroxide; Reduced graphene oxide; Staggered structure; Supercapacitor; Supercapacitor; Staggered structure; In-situ growth; Reduced graphene oxide; Layered double hydroxide
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2022.168048

Layered double hydroxides (LDHs) are of great potential electrode materials for supercapacitors, but the irreversible face-to-face stacking and intrinsic insulation nature of LDHs materials also hinder their electrochemical performances. In this study, nickel–vanadium LDH (NiV-LDH) nanosheets were perpendicularly staggered on the surface of reduced graphene oxide (rGO) via in-situ growth to fabricate a composite material (Ni4V1-LDH@rGO25%) with a conductive skeleton and ion transport channels for enhancing the electrochemical performances of supercapacitor. As a result, the capacitance of the Ni4V1-LDH@rGO25% was 1511.1F/g under a current density of 1A/g, which was higher than those of Ni4V1-LDH (1041.1F/g) and rGO (231.6F/g). The Ni4V1-LDH@rGO25% retained 85.3% of its initial capacitance after 1000 cycles at a high current density of 10A/g. The excellent volumetric performance of the Ni4V1-LDH@rGO25% was attributed to its excellent specific surface area and voidage, as well as its enhanced ion and electron transport capabilities. As the growth substrate for Ni4V1-LDH, rGO could not only improve the conductivity of the composite material but also could enable charge transfer between the LDH and graphene, reduce the redox barrier in the charge and discharge process of the Ni4V1-LDH@rGO25% under the action of a charge field, and improve the capacitor performance. •NiV-LDH@GO with an open staggered three-dimensional structure was fabricated in situ by NiV-LDH nanosheets growth on GO.•GO could reduce the agglomeration of NiV-LDH and improve the infiltration of NiV-LDH@GO in electrolyte.•Hydrazine hydrate could improve the electrochemical properties of NiV-LDH@GO to get NiV-LDH@rGO without damaging the structure.•NiV-LDH@rGO featured better electrical conductivity, larger specific surface area, and more active electron structure.•NiV-LDH@rGO exhibited enhanced supercapacitor performance with an electric capacity of 45.1%, which is higher than that of NiV-LDH.