Journal ArticleDOI
Designed formation of Co3O4/ZnCo2O4/CuO hollow polyhedral nanocages derived from zeolitic imidazolate framework-67 for high-performance supercapacitors
TLDR
The three-dimensional porous nanomaterial Co3O4/ZnCo2O 4/CuO with hollow polyhedral nanocage structures and highly enhanced electrochemical performances was synthesized successfully by a zeolitic imidazolate framework-67 route to show enhanced pseudocapacitive properties and good cycling stability.Abstract:
Zeolitic imidazolate frameworks have stimulated great attention due to their potential applications in energy storage, catalysis, gas sensing, drug delivery etc. In this paper, the three-dimensional porous nanomaterial Co3O4/ZnCo2O4/CuO with hollow polyhedral nanocage structures and highly enhanced electrochemical performances was synthesized successfully by a zeolitic imidazolate framework-67 route. The composites hold the shape of the ZIF-67 templates well and the shell has multiple compositions. In the process, we first synthesized the nanostructure hydroxide precursors and then transformed them into the corresponding metal oxide composites by thermal annealing in air. In addition, the mass ratio of Zn to Cu in this material is discussed and optimized. We found that when the mass ratio is 3, the composite material has better electrochemical properties. When applied as an electrode material, Co3O4/ZnCo2O4/CuO-1 shows enhanced pseudocapacitive properties and good cycling stability compared with Co3O4/ZnCo2O4, Co3O4/CuO and Co3O4/ZnCo2O4/CuO-2, and Co3O4/ZnCo2O4/CuO-3. The assembled Co3O4/ZnCo2O4/CuO-1//AC hybrid device can be reversibly cycled in a large potential range of 0–1.6 V and can deliver a high energy density of 35.82 W h kg−1 as well as the maximum power density of 4799.25 W kg−1.read more
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Metal–Organic Frameworks (MOFs) and MOF-Derived Materials for Energy Storage and Conversion
TL;DR: In this paper, the latest progress and breakthrough in the application of MOF and MOF-derived materials for energy storage and conversion devices are summarized, including Li-based batteries (Li-ion, Li-S and Li-O2 batteries), Na-ion batteries, supercapacitors, solar cells and fuel cells.
Journal ArticleDOI
NiCo-layered double-hydroxide and carbon nanosheets microarray derived from MOFs for high performance hybrid supercapacitors.
TL;DR: Rationally design MOFs derived NiCo-layered double-hydroxide (NiCo-LDH) and nitrogen-doped carbon nanosheets (NC) on the flexible carbon nanotubes (CNTs) film are rationally designed, both of which as the binder-free electrodes can greatly improve the specific surface area and reaction sites.
Journal ArticleDOI
3D flower-like Co-based oxide composites with excellent wideband electromagnetic microwave absorption
Chenxi Wang,Bingbing Wang,Bingbing Wang,Xin Cao,Jiawei Zhao,Lei Chen,Liangang Shan,Haonan Wang,Guanglei Wu +8 more
TL;DR: In this paper, hollow transition metal oxides are synthesized in a solvothermal process to expand the propagation path of electromagnetic waves and the times of reflections and scattering, and the maximum reflection loss (RL) at 12.4 GHz was −56.0 dB and the wide effective absorption bandwidth (EAB) of 6.24 GHz was 6.6 dB.
Journal ArticleDOI
MOFs-derived Co9S8-embedded graphene/hollow carbon spheres film with macroporous frameworks for hybrid supercapacitors with superior volumetric energy density
TL;DR: In this article, a novel macroporous nanostructure is synthesized utilizing N-doped hollow carbon spheres and ZIF-67 derived Co9S8 embedded in graphene.
Journal ArticleDOI
PVP-assisted growth of Ni-Co oxide on N-doped reduced graphene oxide with enhanced pseudocapacitive behavior
Chengxiang Huang,Yinhui Ding,Chen Hao,Zhou Saisai,Xiaohong Wang,Gao Haiwen,Linli Zhu,Jingbo Wu +7 more
TL;DR: In this article, NiCo2O4/N-rGO nanocomposites were prepared by using solvothermal method and hydrothermal method, and the specific surface area of the composite material reaches 99.38m2
References
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Hollow Micro-/Nanostructures: Synthesis and Applications**
TL;DR: Hollow micro-/nanostructures are of great interest in many current and emerging areas of technology as discussed by the authors, and a comprehensive overview of synthetic strategies for hollow structures is presented.
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Journal ArticleDOI
Metal–organic frameworks for energy storage: Batteries and supercapacitors
TL;DR: A broad overview of metal-organic frameworks (MOFs) derived rechargeable lithium ion batteries and supercapacitors can be found in this article, where the authors focus on recent advances.
Journal ArticleDOI
Designed Formation of Co3O4/NiCo2O4 Double-Shelled Nanocages with Enhanced Pseudocapacitive and Electrocatalytic Properties
TL;DR: The designed synthesis of novel box-in-box nanocages with different shell compositions, namely, Co3O4/NiCo2O4 double-shelled nanocage (DSNCs) with greatly improved electrochemical performance demonstrates the importance of rational design and synthesis of hollow structures with higher complexity.
Journal ArticleDOI
Asymmetric Supercapacitors Using 3D Nanoporous Carbon and Cobalt Oxide Electrodes Synthesized from a Single Metal-Organic Framework.
Rahul R. Salunkhe,Jing Tang,Jing Tang,Yuichiro Kamachi,Yuichiro Kamachi,Teruyuki Nakato,Jung Ho Kim,Yusuke Yamauchi,Yusuke Yamauchi +8 more
TL;DR: Improved capacitance performance was successfully realized for the ASC (Co3O4//carbon), better than those of the SSCs based on nanoporous carbon and nanoporous Co3O 4 materials (i.e., carbon//carbon and Co3o4//Co3 O4).