Abstract
In this study, a zeolitic imidazolate framework-67 (ZIF-67) was prepared as a precursor using a facile hydrothermal method. After a calcination reaction in the air, the as-prepared precursor was converted to porous thin-wall hollow Co3O4 with its original frame structure almost preserved. The physical and chemical characterizations of the nanomaterial were analyzed systemically. The electrochemical tests indicate that the obtained Co3O4 possesses large specific capacitances of 988 and 925 F/g at 1 and 20 A/g accompanying an outstanding rate capability (a 93.6% capacitance retention) and retains 96.6% of the specific capacitance, even after 6000 continuous charge/discharge cycles. These excellent properties mark the Co3O4 a promising electrode material for high performance supercapacitors.
Highlights
Rapid technological development and accelerated natural resource consumption have largely increased the demand for efficient, environmentally-friendly, cost-effective, and safe energy storage devices [1,2,3,4]
Supercapacitors can be divided into two categories according to their energy storage mechanism: One is the electric double-layer capacitor (EDLCs), which is mainly made of carbonaceous materials [12,13,14,15,16]; the other is the faradic redox reaction pseudocapacitor (PsCs), which usually utilizes transition metal oxides/hydroxides as electrode materials [17,18,19,20,21]
A great deal of efforts have been devoted to synthesizing Co3 O4 with hollow morphologies such as hollow spheres [28], hollow nanocubes [29], and hollow cages [30]
Summary
Rapid technological development and accelerated natural resource consumption have largely increased the demand for efficient, environmentally-friendly, cost-effective, and safe energy storage devices [1,2,3,4]. Supercapacitors can be divided into two categories according to their energy storage mechanism: One is the electric double-layer capacitor (EDLCs), which is mainly made of carbonaceous materials [12,13,14,15,16]; the other is the faradic redox reaction pseudocapacitor (PsCs), which usually utilizes transition metal oxides/hydroxides as electrode materials [17,18,19,20,21]. We successfully prepared porous thin-wall hollow Co3 O4 spheres from a zeolitic imidazolate framework-67 (ZIF-67) precursor through a simple and fast reaction. This nanostructure offers a large accessible surface area with numerous pathways. The pseudocapacitive performance manifests the great potential of the porous thin-wall hollow Co3 O4 spheres as electrode materials for applications in supercapacitors
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
