期刊
NANOSCALE RESEARCH LETTERS
卷 14, 期 -, 页码 -出版社
SPRINGEROPEN
DOI: 10.1186/s11671-019-3054-3
关键词
Transition metal oxide; Core-shell structure; Hydrothermal method; Energy storage; Pseudocapacitors
资金
- National Natural Science Foundation of China [61705026]
- Basic and Frontier Research Program of Chongqing Municipality [cstc2016jcyjAX0014, cstc2018jcyjX0492]
- Scientific and Technological Research Program of Chongqing Municipal Education Commission [KJ1601133, KJ1711269]
- open topic of Key Laboratory of Micro-nano Materials Engineering and Technology of Chongqing University [KF2016012]
- open topic of New Energy Storage Devices and Application Engineering Research Center of Chongqing University [KF20170203, KF20170106]
- Graduate Research Project of Chongqing University of Arts and Sciences [ME2018 ME10]
- Special Program for Academicians take the lead in technological innovation of Chongqing [cstc2018jcyj-yszxX0003]
As typical electrode materials for supercapacitors, low specific capacitance and insufficient cycling stability of transition metal oxides (TMOs) are still the problems that need to be solved. Design of core-shell structure is considered as an effective method for preparation of high-performance electrode materials. In this work, NiO flakes@CoMoO4 nanosheets/Ni foam (NiO flakes@CoMoO4 NSs/NF) core-shell architecture was constructed by a two-step hydrothermal method. Interestingly, the CoMoO4 NSs are vertically grown on the surface of NiO flakes, forming a two-dimensional (2D) branched core-shell structure. The porous core-shell architecture has relatively high surface area, effective ions channels, and abundant redox sites, resulting in excellent electrochemical performance. As a positive electrode for supercapacitors, NiO flakes@CoMoO4 NSs/NF core-shell architecture exhibits excellent capacitive performance in terms of high specific capacitance (1097F/g at 1A/g) and outstanding cycling stability (97.5% after 2000 circles). The assembled asymmetric supercapacitor (ASC) of NiO flakes@CoMoO4 NSs/NF//active carbon (AC)/NF possesses a maximum energy density of 25.8Wh/kg at power density of 894.7W/kg. The results demonstrate that NiO flakes@CoMoO4 NSs/NF electrode displays potential applications in supercapacitors and the design of 2D branched core-shell architecture paves an ideal way to obtain high-performance TMOs electrodes.
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