High-performance asymmetric supercapacitor made of NiMoO4 nanorods@Co3O4 on a cellulose-based carbon aerogel.

Meixia Wang,Xibin Yi,Jing Zhang,Xinfu Zhao,Xiaochan Liu,Benxue Liu

doi:10.3762/bjnano.11.18

Abstract

In this study, a new nanoporous material comprising NiMoO4 nanorods and Co3O4 nanoparticles derived from ZIF-67 supported by a cellulose-based carbon aerogel (CA) has been successfully synthesized using a two-step hydrothermal method. Due to its chemical composition, the large specific surface and the hierarchical porous structure, the NiMoO4@Co3O4/CA ternary composite yields electrodes with an enhanced specific capacitance of 436.9 C/g at a current density of 0.5 A/g and an excellent rate capability of 70.7% capacitance retention at 5.0 A/g. Moreover, an advanced asymmetric supercapacitor (ASC) is assembled using the NiMoO4@Co3O4/CA ternary composite as the positive electrode and activated carbon as the negative electrode. The ASC device exhibits a large capacitance of 125.4 F/g at 0.5 A/g, a maximum energy density of 34.1 Wh/kg at a power density of 208.8 W/kg as well as a good cyclic stability (84% after 2000 cycles), indicating its wide applicability in energy storage. Finally, our results provide a general approach to the construction of CA and MOF-based composite materials with hierarchical porous structure for potential applications in supercapacitors.

Highlights

In recent years, in the light of environmental degradation and an increasing energy demand, the development of various new, renewable and clean energy conversion and storage devices has attracted wide attention [1,2,3,4]
Based on the above considerations, we present a simple scalable strategy to fabricate an integrated NiMoO4@Co3O4 hierarchical porous structure aligned on carbon aerogel (CA), which is derived from a cellulose precursor, to be applied in an advanced asymmetric supercapacitor (ASC)
CA was obtained by carbonization of the cellulose aerogel precursor, which was produced from microcrystalline cellulose (MC)

Summary

Introduction

In the light of environmental degradation and an increasing energy demand, the development of various new, renewable and clean energy conversion and storage devices has attracted wide attention [1,2,3,4].

Results

Conclusion