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Hierarchical heterostructures of MnO2 nanosheets or nanorods grown on Au-coated Co3O4 porous nanowalls for high-performance pseudocapacitance.
MedLine Citation:
PMID:  23450437     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
The rational design and fabrication of more multi-component (material-combination) 3D hierarchical heterostructures for high-performance pseudocapacitor applications still remains a challenge. Herein, we have designed and synthesized a 3D hierarchical heterostructure of MnO2 nanosheets or nanorods grown on an Au-coated Co3O4 porous nanowall array, resembling a sandwich configuration of Co3O4@Au@MnO2, by a facial and controllable electrochemical deposition process. Due to their unique self-assembling architecture and characteristics including porous Co3O4 nanowalls, ultrathin MnO2 nanosheets, and a high conductivity Au layer sandwiched between them, each component provides a much-needed critical function for the efficient use of metal oxides for energy storage. The synthesized 3D hierarchical heterostructures exhibited favorable electrochemical performances, such as a high specific capacitances of 851.4 F g-1 at 10 mV s-1 and 1532.4 F g-1 at 1 A g-1, good rate performance and an excellent long-term cycling stability (almost no degradation after 5000 cycles), which are better than those of the reported Co3O4 or MnO2 based electrode materials, and thus could be considered as perspective materials for high-performance electrochemical capacitors.
Authors:
Wenyao Li; Gao Li; Jianqing Sun; Rujia Zou; Kaibing Xu; Yangang Sun; Zhigang Chen; Jianmao Yang; Junqing Hu
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-3-1
Journal Detail:
Title:  Nanoscale     Volume:  -     ISSN:  2040-3372     ISO Abbreviation:  Nanoscale     Publication Date:  2013 Mar 
Date Detail:
Created Date:  2013-3-1     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101525249     Medline TA:  Nanoscale     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China. hu.junqing@dhu.edu.cn.
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