Stepwise Splitting Growth and Pseudocapacitive Properties of Hierarchical Three-Dimensional Co3O4 Nanobooks

Abstract

Three-dimensional hierarchical Co3O4 nanobooks have been synthesized successfully on a large scale by calcining orthorhombic Co(CO3)0.5(OH)·0.11H2O precursors with identical morphologies. Based on the influence of reaction time and urea concentration on the nanostructures of the precursors, a stepwise splitting growth mechanism can be proposed to understand the formation of the 3D nanobooks. The 3D Co3O4 nanobooks exhibit excellent pseudocapacitive performances with specific capacitances of 590, 539, 476, 453, and 421 F/g at current densities of 0.5, 1, 2, 4, and 8 A/g, respectively. The devices can retain ca. 97.4% of the original specific capacitances after undergoing charge–discharge cycle tests 1000 times continuously at 4 A/g.

Non‐enzymatic glucose sensor based on three‐dimensional hierarchical Co 3 O 4 nanobooks

“…Growth of 3D hierarchical Co 3 O 4 NBs was carried out using the hydrothermal method reported in our previous work [32]. A total of 0.727 g of cobalt nitrate hexahydrate (Co(NO 3 ) 2 •6H 2 O) was dispersed into 40 ml of the mix solution of EG and DI water (volume ratio of 1:1) to form a homogeneous solution with stirring for 30 min.…”

“…In our previous work, 3D hierarchical Co 3 O 4 nanobooks (Co 3 O 4 NBs) have been synthesised for the first time on a large scale based on stepwise splitting growth of 2D nanosheets [32]. Herein we would like to report a new non‐enzymatic glucose sensor assembled with these 3D hierarchical Co 3 O 4 NBs.…”

Superior Lithium Ion Storage Performance of LiCoO2 Cathode at 4.5 V Enabled by the Multiple Synergistic Effect of Nano-Silver

“…The Co(CO 3 ) 0.5 (OH)•0.11H 2 O precursors with nanobook-like structures were firstly synthesized by the solvothermal synthesis method reported by our group. 39 For details, under continuous magnetic stirring, 0.291 g of Co(NO 3 ) 2 •6H 2 O was dissolved in 80 ml mixed solvent of ethylene glycol and deionized water to form a homogeneous mixed solution. Then 0.3004 g of NH 2 CONH 2 was added into the above mixed solution.…”

Recent advances in hydrothermally and solvothermally grown Co3O4 nanostructures for electrochemical energy storage (EES) applications: a brief review

“…111 The morphology of synthesized active electrode materials significantly influences their optical and electrochemical performance. Various morphologies, including mesoporous nanoneedles, 112 needle-like nanotubes, 113 hollow octahedral cages, 114 pompon-like microspheres, 13 nanocapsules, 115 3D hierarchical nanobooks, 116 and more, have been reported for the preparation of Co 3 O 4 -based active electrodes in energy storage applications (Fig. 4).…”