3D Hierarchical Ni/NiCo2O4 Core-Shell Nanotube Arrays with High Capacitance and Stable Cycling Performance for Supercapacitor

Publisher： Bentham Science Publishers

E-ISSN： 1875-6786|14|1|26-32

ISSN： 1573-4137

Source： Current Nanoscience, Vol.14, Iss.1, 2018-01, pp. : 26-32

Disclaimer: Any content in publications that violate the sovereignty, the constitution or regulations of the PRC is not accepted or approved by CNPIEC.

Previous Menu Next

Abstract

Background: Binary metal oxides, such as spinel nickel cobaltite (NiCo2O4), are attractivepseudocapacitive materials in electrochemical supercapacitors because they have higher theoreticalcapacitance than carbonaceous materials, and higher electronic conductivity than conventionalmonometal oxides. However, their practical pseudocapacitive performance is dramatically hinderedby traditional electrode assembly technologies, through which extremely high internal resistances aregenerated at supplementary interfaces within nanostructured binary metal oxides and between binarymetal oxides/current collector.Methods: Here, we develop polymer-binder-free hybrid electrodes by employing Ni nanotube arraysas 3D current collectors for the loading of electroactive NiCo2O4 nanosheets (Ni/NiCo2O4 nanotubearray).Results: As a result of the remarkably enhanced electronic conductivity and ion diffusion, theNi/NiCo2O4 nanotube array electrodes exhibit a specific capacitance of as high as ~753 F g-1 at ascan rate of 5 mV s-1 and rate performance, in addition to a long-term cycling stability.Conclusion: The outstanding performance makes the Ni/NiCo2O4 nanotube array to be an efficaciouspower source electrode in a wide range of applications.