Institution
Harbin Engineering University
Education•Harbin, Heilongjiang, China•
About: Harbin Engineering University is a education organization based out in Harbin, Heilongjiang, China. It is known for research contribution in the topics: Control theory & Microstructure. The organization has 31149 authors who have published 27940 publications receiving 276787 citations. The organization is also known as: HEU.
Papers published on a yearly basis
Papers
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TL;DR: A hierarchical porous Ni(OH)2/graphene composite as a electrode material for supercapacitors displays ultrahigh specific capacitance, superior cycling performance, and excellent rate capability as mentioned in this paper.
Abstract: Hierarchical porous Ni(OH)2 nanoflakes anchored on graphene sheets has been fabricated by a facile chemical precipitation approach. The as-prepared Ni(OH)2/graphene composite as a electrode material for supercapacitors displays ultrahigh specific capacitance, superior cycling performance, and excellent rate capability. A maximum specific capacitance of 2194 F g−1 could be obtained at 2 mV s−1 in 6 M KOH aqueous solution. Meanwhile, the electrode exhibits excellent long cycle life along with 95.7% specific capacitance retained after 2000 cycle tests. Such composite is a highly promising candidate as electrode material for broad applications in energy conversion/storage systems.
257 citations
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TL;DR: The fabrication of 3D carbonaceous material composed of 1D carbon nanofibers grown on 2D graphene sheets via a CVD approach in a fluidized bed reactor shows high reversible capacity, high-rate performance, and cycling stability, which is superior to those of pure graphene, natural graphite, and carbon nanotubes.
Abstract: We report on the fabrication of 3D carbonaceous material composed of 1D carbon nanofibers (CNF) grown on 2D graphene sheets (GNS) via a CVD approach in a fluidized bed reactor. Nanographene-constructed carbon nanofibers contain many cavities, open tips, and graphene platelets with edges exposed, providing more extra space for Li(+) storage. More interestingly, nanochannels consisting of graphene platelets arrange almost perpendicularly to the fiber axis, which is favorable for lithium ion diffusion from different orientations. In addition, 3D interconnected architectures facilitate the collection and transport of electrons during the cycling process. As a result, the CNF/GNS hybrid material shows high reversible capacity (667 mAh/g), high-rate performance, and cycling stability, which is superior to those of pure graphene, natural graphite, and carbon nanotubes. The simple CVD approach offers a new pathway for large-scale production of novel hybrid carbon materials for energy storage.
256 citations
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TL;DR: In this article, the authors investigated the dielectric properties of the Fe3O4/ZnO core/shell nanorod−wax composites and showed that the resonant behavior mainly results from interface polarization induced by the special core/hell structures, dipole polarization of both Fe3 o4 and ZnO, and electron transfer between Fe2+ and Fe3+ ions in Fe3 O4.
Abstract: Fe3O4/ZnO core/shell nanorods are successfully fabricated by combing an inorganic-phase reaction with a hydrogen annealing process. The transmission electron microscopy analysis indicates that the diameter and the length of the core/shell nanorods are 25−80 and 0.35−1.2 μm, respectively. Electromagnetic properties of the core/shell nanorod−wax composites are investigated. The permittivity of the composites shows four dielectric resonant peaks in 2−18 GHz, which can be explained by the transmission line theory. The resonant behavior mainly results from interface polarization induced by the special core/shell structures, dipole polarization of both Fe3O4 and ZnO, and electron transfer between Fe2+ and Fe3+ ions in Fe3O4. The maximum reflection loss is about −30 dB at 10.4 GHz for the composites with a thickness of 1.5 mm, and the absorption bandwidth with the reflection loss below −20 dB is up to 11 GHz for an absorber with the thickness in 2−4 mm. Thus, our results demonstrate that the Fe3O4/ZnO core/shell...
256 citations
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255 citations
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TL;DR: In this paper, a facile in situ growth process was developed to prepare a hierarchical 3D composite composed of graphene layers with layered double hydroxide (LDH) nanosheet arrays grown on both sides.
Abstract: In this study, we have developed, for the first time, a facile in situ growth process to prepare a hierarchical three-dimensional (3D) composite composed of graphene layers with layered double hydroxide (LDH) nanosheet arrays grown on both sides. The fabrication process involves coating AlOOH colloids onto the graphene surfaces and the subsequent in situ growth of layered NiAl–LDH nanosheet arrays on the surfaces of graphene sheets via a hydrothermal process. It is found that the NiAl–LDH nanosheet arrays grow perpendicularly and uniformly on both sides of the graphene sheets, constructing a hierarchical 3D nanocomposite with an interesting sandwich structure. This uniquely structured composite has a large specific surface area (184.7 m2 g−1) and typical mesoporous characteristics, which are favorable for achieving high pseudocapacitance performance. Our results reveal that the composite has a specific capacitance of 1329 F g−1 at a current density of 3.57 A g−1, and the specific capacitance still remains as high as 851 F g−1 even when the current density is increased to 17.86 A g−1. The specific capacitance remains at 91% (823 F g−1) after 500 cycles at 15.30 A g−1 compared with 74% for pure Ni/Al–LDH. The in situ growth method may pave a way to design and fabricate diverse LDH/graphene composites with interesting structures for potential application in supercapacitors and other fields.
254 citations
Authors
Showing all 31363 results
Name | H-index | Papers | Citations |
---|---|---|---|
Peng Shi | 137 | 1371 | 65195 |
Lei Zhang | 130 | 2312 | 86950 |
Yang Liu | 129 | 2506 | 122380 |
Tao Zhang | 123 | 2772 | 83866 |
Wei Zhang | 104 | 2911 | 64923 |
Wei Liu | 102 | 2927 | 65228 |
Feng Yan | 101 | 1041 | 41556 |
Lianzhou Wang | 95 | 596 | 31438 |
Xiaodong Xu | 94 | 1122 | 50817 |
Zhiguo Yuan | 93 | 633 | 28645 |
Rong Wang | 90 | 950 | 32172 |
Jun Lin | 88 | 699 | 30426 |
Yufeng Zheng | 87 | 797 | 31425 |
Taihong Wang | 84 | 279 | 25945 |
Mao-Sheng Cao | 81 | 314 | 24046 |