NiCo 2 O 4 hollow microspheres with tunable numbers and thickness of shell for supercapacitors

Qi, Xinhong; Zheng, Wenji; Tian, Tianfang; Du, Naixu; Wang, Le

doi:10.1016/j.cej.2016.10.060

Cited by 107 publications

(46 citation statements)

References 43 publications

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“…Figure a shows the typical survey spectrum of the sample tested, in which the featured peaks of Ni, Co, O, C and N elements are all existed. As presented in Figure b, the Ni 2p region exhibits two main peaks at 854.7 and 856.1 eV, which are characteristic of Ni 2+ and Ni 3+ , and two shakeup satellites (denoted as “Sat.”), respectively ,. Figure c presents the high‐resolution spectrum of Co 2p, which consists of two spin‐orbit doublets and two shakeup satellites.…”

Section: Resultsmentioning

confidence: 99%

A Novel CVD Growth of g‐C₃N₄ Ultrathin Film on NiCo₂O₄ Nanoneedles/Carbon Cloth as Integrated Electrodes for Supercapacitors

et al. 2018

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Although g‐C3N4 possesses many features such as a graphene‐like 2D π‐conjugated planar layered structure, high nitrogen content, excellent mechanical strength and flexibility, as well as high thermal and chemical stability, there are only a few studies on the exploration of g‐C3N4 as active materials for supercapacitors. This could be largely attributed to the fact that the above advantages of g‐C3N4 to hybrid with other materials are still not fully established. Herein, we successfully develop a facile low‐temperature CVD method to grow g‐C3N4 ultrathin films with several nanometers thickness on the surface of NiCo2O4 nanoneedles. Subsequently, a NiCo2O4 nanoneedles@g‐C3N4 ultrathin film core‐shell nanostructures/carbon cloth (NiCo2O4 NNs@g‐C3N4/CC) integrated electrode was obtained. Thanks to the ultrathin film, a core‐shell nanostructure, as well as intrinsic features of g‐C3N4, the as‐obtained integrated electrode displays excellent electrochemical performance, exhibiting an areal capacitance of 2.83 F cm−2 as well as high cycling stability (5.88 % loss after 10 000 cycles). Our results clearly demonstrate that the g‐C3N4 ultrathin film obtained through this facile CVD method developed has potential in hybridizing with other transition metal oxides as electrode materials for supercapacitors and, more importantly, this convenient synthesis method may also be widely used for other applications such as designing new heterojunction photocatalysts.

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Section: Resultsmentioning

confidence: 99%

A Novel CVD Growth of g‐C₃N₄ Ultrathin Film on NiCo₂O₄ Nanoneedles/Carbon Cloth as Integrated Electrodes for Supercapacitors

et al. 2018

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“…The presence of numerous COOH and OH functional groups on the template surface facilitates Ni 2+ penetration and provides a controllable production and spacing of diverse multishelled NiO hollow microspheres with a variety of shell numbers via adjusting the heating rate, metal ion concentration, and adsorption time (Figure a). Similarly, our group further fabricated mixed‐transition metal oxide multishelled structures by a one‐step synthesis and adsorption, such as nickel–cobalt oxide, Ni‐ and Co‐doped Fe 2 O 3 , and Ni–Co–O microspheres. With optimized Ni/Co ratios, a deeper penetration of metal cations can be realized.…”

Section: Synthetic Approaches For Multishelled Hollow Structuresmentioning

confidence: 99%

Section: Synthetic Approaches For Multishelled Hollow Structuresmentioning

confidence: 99%

“…Remarkably, the asymmetric supercapacitor manifested a high capacitance retention of 78.8% over 10 000 cycles. Furthermore, our group also reported the synthesis of multishelled hollow microspheres with mixed transition metal oxides, such as NiCo 2 O 4 , and nickel–cobalt oxide with optimized Ni/Co ratios, exhibiting excellent performance because of the tuned multishelled hollow structures with more electroactive sites and faster electrolyte permeation.…”

Section: Energy Applicationsmentioning

confidence: 99%

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Multishelled Transition Metal‐Based Microspheres: Synthesis and Applications for Batteries and Supercapacitors

Liu

Shen

et al. 2019

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With the rapid growth of material innovations, multishelled hollow nanostructures are of tremendous interest due to their unique structural features and attractive physicochemical properties. Continued effort has been made in the geometric manipulation, composition complexity, and construction diversity of this material, expanding its applications. Energy storage technology has benefited from the large surface area, short transport path, and excellent buffering ability of the nanostructures. In this work, the general synthesis of multishelled hollow structures, especially with architecture versatility, is summarized. A wealth of attractive properties is also discussed for a wide area of potential applications based on energy storage systems, including Li‐ion/Na‐ion batteries, supercapacitors, and Li–S batteries. Finally, the emerging challenges and outlook for multishelled hollow structures are mentioned.

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“…Different from single metallic counterparts, bimetallic oxides based electrodes, MCo 2 O 4 (M=Ni, Cu, Mn and Zn), with spinel‐like structure, demonstrated unique electrochemical performances in terms of reversible capacity, structural stability, and electrical conductivity, owing to the complementarity and synergetic eﬀect from two metallic species. Recently, some cobalt‐based ternary metal oxides powders such as NiCo 2 O 4 and FeCo 2 O 4 with various hollow structures prepared with the presence of MOFs were found to show improved performance as electrode materials for energy storage devices . To assemble into energy storage devices, these powders should be mixed with polymer binders and conductive carbon black and then coated onto the current collectors, which usually caused the increase of interfacial impedance and the detachment of active materials from current collector.…”

Section: Introductionmentioning

confidence: 99%

Metal‐Organic‐Framework‐Derived MCo₂O₄ (M=Mn and Zn) Nanosheet Arrays on Carbon Cloth as Integrated Anodes for Energy Storage Applications

et al. 2019

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Electrode materials with special microstructures derived from metal‐organic frameworks (MOFs) exhibited high performance in electrochemical energy storage devices. In this manuscript, using freshly prepared Co−MOF nanosheet arrays as the self‐sacrificed template, MCo2O4 (M=Mn and Zn) nanosheet arrays were successfully grown on carbon cloth (CC) by using a facile solution method. As‐prepared MnCo2O4@CC and ZnCo2O4@CC were used as the integrated electrodes for supercapacitors and Li‐ion batteries. Studies found that both integrated electrodes delivered high capacity and a long cycling life of 20 000 cycles with the capacity retention of 95.5 % for MnCo2O4@CC and 94.7 % for ZnCo2O4@CC at the current density of 50 mA cm−2, respectively. Assembled into asymmetric supercapacitors with carbon nanosheet arrays@CC (CNS@CC), the obtained maximum energy densities were measured to be 25.6 Wh kg−1 at the power density of 3.4 kW kg−1 for MnCo2O4@CC//CNS@CC based device and 22.7 Wh kg−1 at the power density of 4.1 kW kg−1 for ZnCo2O4@CC//CNS@CC based device, respectively. In addition, both integrated electrodes also showed good lithium storage performance, delivering high capacities of 1289 mA h/g (MnCo2O4@CC) and 1376 mA h/g (ZnCo2O4@CC) even after 200 cycles at the current density of 1 A g−1, respectively. The outstanding performances suggest the potential of both nanosheet arrays integrated electrodes for extensive applications in energy storage devices.

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NiCo 2 O 4 hollow microspheres with tunable numbers and thickness of shell for supercapacitors

Cited by 107 publications

References 43 publications

A Novel CVD Growth of g‐C₃N₄ Ultrathin Film on NiCo₂O₄ Nanoneedles/Carbon Cloth as Integrated Electrodes for Supercapacitors

A Novel CVD Growth of g‐C₃N₄ Ultrathin Film on NiCo₂O₄ Nanoneedles/Carbon Cloth as Integrated Electrodes for Supercapacitors

Multishelled Transition Metal‐Based Microspheres: Synthesis and Applications for Batteries and Supercapacitors

Metal‐Organic‐Framework‐Derived MCo₂O₄ (M=Mn and Zn) Nanosheet Arrays on Carbon Cloth as Integrated Anodes for Energy Storage Applications

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NiCo 2 O 4 hollow microspheres with tunable numbers and thickness of shell for supercapacitors

Cited by 107 publications

References 43 publications

A Novel CVD Growth of g‐C3N4 Ultrathin Film on NiCo2O4 Nanoneedles/Carbon Cloth as Integrated Electrodes for Supercapacitors

A Novel CVD Growth of g‐C3N4 Ultrathin Film on NiCo2O4 Nanoneedles/Carbon Cloth as Integrated Electrodes for Supercapacitors

Multishelled Transition Metal‐Based Microspheres: Synthesis and Applications for Batteries and Supercapacitors

Metal‐Organic‐Framework‐Derived MCo2O4 (M=Mn and Zn) Nanosheet Arrays on Carbon Cloth as Integrated Anodes for Energy Storage Applications

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A Novel CVD Growth of g‐C₃N₄ Ultrathin Film on NiCo₂O₄ Nanoneedles/Carbon Cloth as Integrated Electrodes for Supercapacitors

A Novel CVD Growth of g‐C₃N₄ Ultrathin Film on NiCo₂O₄ Nanoneedles/Carbon Cloth as Integrated Electrodes for Supercapacitors

Metal‐Organic‐Framework‐Derived MCo₂O₄ (M=Mn and Zn) Nanosheet Arrays on Carbon Cloth as Integrated Anodes for Energy Storage Applications