General Synthesis of Porous Mixed Metal Oxide Hollow Spheres with Enhanced Supercapacitive Properties

Wang, Qinghong; Zhu, Yuxuan; Xue, Jing; Zhao, Xinsheng; Guo, Zaiping; Wang, Chao

doi:10.1021/acsami.6b03966

Cited by 85 publications

(32 citation statements)

References 41 publications

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“…[203,208] Generally, hollow micro/nanostructures possess distinct advantages as electrode materials: 1) larger surface areas and void spaces can not only enlarge electrode/electrolyte contact area, but also provide more sites for ions adsorption, resulting in improved capacitance; 2) nanosized shells reduce diffusion pathways for both ions and electrons and facilitate the rapid intercalation/deintercalation of active species, giving rise to enhanced rate performances [209] ; 3) enhanced mechanical strength and preserved permeability are achieved through the self-supporting construction, leading to better cycle stability. [200,214] [211] Su and co-workers prepared uniform rambutan-like CeO 2based heterostructured CeO 2 -CuO HSs constructed from nanorods and NPs as building blocks.…”

Section: Supercapacitymentioning

confidence: 99%

Hollow Micro/Nanostructured Ceria‐Based Materials: Synthetic Strategies and Versatile Applications

Wang

2018

Advanced Materials

104

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Hollow micro/nanostructured CeO2‐based materials (HMNCMs) have triggered intensive attention as a result of their unique structural traits, which arise from their hollowness and the fascinating physicochemical properties of CeO2. This attention has led to widespread applications with improved performance. Herein, a comprehensive overview of methodologies applied for the synthesis of various hollow structures, such as hollow spheres, nanotubes, nanoboxes, and multishelled hollow spheres, is provided. The synthetic strategies toward CeO2 hollow structures are classified into three major categories: 1) well‐established template‐assisted (hard‐, soft‐, and in situ template) methods; 2) newly emerging self‐template approaches, including selective etching, Ostwald ripening, the Kirkendall effect, galvanic replacement, etc.; 3) bottom‐up self‐organized formation synthesis (namely, oriented attachment and self‐deformation). Their underlying mechanisms are concisely described and discussed in detail, the differences and similarities of which are compared transversely and longitudinally. Niche applications of HMNCMs in a wide range of fields including catalysis, energy conversion and storage, sensors, absorbents, photoluminescence, and biomedicines are reviewed. Finally, an outlook of future opportunities and challenges in the synthesis and application of CeO2‐based hollow structures is also presented.

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Section: Supercapacitymentioning

confidence: 99%

Hollow Micro/Nanostructured Ceria‐Based Materials: Synthetic Strategies and Versatile Applications

Wang

2018

Advanced Materials

104

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“…Consistent with the CV results, all of the curves are approximately symmetric and have plateaus characteristic of faradaic behavior during charge/discharge process. 3,49 The specic capacitance derived from the CP curves for the Ni 1.4 Co 1.6 S 4 /NGF electrode at the current density of 0.5 A g À1 is 1634 F g À1 , and it remains 1372 F g À1 at the current density of 20 A g À1 , suggesting a remarkable rate capability of the electrode.…”

Section: Resultsmentioning

confidence: 99%

Nitrogen doped graphite felt decorated with porous Ni_1.4Co_1.6S₄ nanosheets for 3D pseudocapacitor electrodes

et al. 2017

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“…[23] Figure S22, Supporting Information, shows the SEM image of CNZO after 5000 cycles. At the same time, we also compare the test results with the reported work previously such as Co3O4/ ZnCo2O4/CuO-1//AC (35.82 Wh kg −1 at 800 W kg −1 ), [68] ZnO/ Co3O4-450//AC (47.7 Wh kg −1 at 750 W kg −1 ), [18] ZICO//N-G (40.5 Wh kg −1 at 750 W kg −1 ), [26] ZIF-NCS//AC (44.8 Wh kg −1 at 794.5 W kg −1 ), [69] ZnCo2O4//AC (52.36 Wh kg −1 at 650W kg −1 ), [70] PFNC//PFN (27.75 Wh kg −1 at 300 W kg −1 ), [71] and ZNCO//AC (35.6 Wh kg −1 at 187.6 W kg −1 ). By calculation, we obtained the energy density and power density of CNZO//PGH HSC, and the calculation results are shown in Figure 7g.…”

Section: Wwwadvelectronicmatdementioning

confidence: 99%

Hybrid Supercapacitors Based on Interwoven CoO‐NiO‐ZnO Nanowires and Porous Graphene Hydrogel Electrodes with Safe Aqueous Electrolyte for High Supercapacitance

Sun

Wang

et al. 2019

Adv Elect Materials

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pollution. [6,7] The electrode material is an important factor to determine the performance of supercapacitors. [8] At present, electrode materials are roughly classified into four categories: metal oxides, carbon materials, conductive polymers, metal sulfides, and others. Compared with the other materials, metal oxides are favored by researchers because of their low cost and extremely high theoretical specific capacitance. [9] Various metal oxides, such as CoO, [10] NiO, [11] ZnO, [12,13] Co 3 O 4 , [14] Fe 2 O 3 , [15] and MnO 2 [16,17] have been used as electrode materials for supercapacitors. ZnO is one of the typical semiconductor materials. Due to its good electrochemical activity, large specific surface area, low cost, easy manufacturing, and high mechanical flexibility, it is considered to be a promising electrode material for supercapacitors. [12] However, the theoretical specific capacitance of ZnO limits its application in energy storage fields such as supercapacitor. [18] CoO is applied as electrode widely due to its ultra-high theoretical specific capacitance and high redox activity. [19,20] However, the high electrical resistance and poor electrical conductivity during charge and discharge restrict the cycle stability of CoO. As one of the materials currently used in supercapacitor electrode materials, NiO has the advantages of high theoretical specific capacitance and large specific surface area, but it is well known that its cycle stability and rate performance are poor. [21] Therefore, the composite materials obtained by combining several of them can also take advantage of their long complements and fully exert their synergistic effects, so that the comprehensive electrochemical performance is improved significantly so as to solve the problems of single metal oxide electrode. [22,23] For example, the surface/volume ratio of the nanostructures can increase the specific capacitance exponentially. The urchinlike CoO nanostructures were selected as the framework for depositing NiO nanosheets to construct a graded core/shell CoO@NiO hybrid nanostructure. [24] Unfortunately, although it has a good specific capacitance and energy density, its cycle stability is poor. ZnO/CoO composite in situ grown on Ni foam was produced, although the cycle stability is improved, the general specific capacitance is less satisfactory. [25] Compared with the single metal oxides, the energy density, power density, Metal oxides-based supercapacitors have attracted much attention due to their easy fabrication and ultra-high theoretical specific capacitance. Here, a novel ternary metal oxide (CoO-NiO-ZnO, CNZO) in situ grown on Ni foam (CNZO@Ni foam) is prepared by one-pot hydrothermal synthesis and a subsequent annealing method. Compared with the corresponding binary and single metal oxides of CoO-ZnO, NiO-ZnO, CoO-NiO, CoO, NiO, and ZnO, this ternary metal oxide shows an ultra-high specific capacitance (areal capacitance) of 2115.5 F g −1 (4.23 F cm −2 ) at a current density of 1 A g −1 (2 mA cm −2 ). Further, a hybrid sup...

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General Synthesis of Porous Mixed Metal Oxide Hollow Spheres with Enhanced Supercapacitive Properties

Cited by 85 publications

References 41 publications

Hollow Micro/Nanostructured Ceria‐Based Materials: Synthetic Strategies and Versatile Applications

Hollow Micro/Nanostructured Ceria‐Based Materials: Synthetic Strategies and Versatile Applications

Nitrogen doped graphite felt decorated with porous Ni_1.4Co_1.6S₄ nanosheets for 3D pseudocapacitor electrodes

Hybrid Supercapacitors Based on Interwoven CoO‐NiO‐ZnO Nanowires and Porous Graphene Hydrogel Electrodes with Safe Aqueous Electrolyte for High Supercapacitance

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General Synthesis of Porous Mixed Metal Oxide Hollow Spheres with Enhanced Supercapacitive Properties

Cited by 85 publications

References 41 publications

Hollow Micro/Nanostructured Ceria‐Based Materials: Synthetic Strategies and Versatile Applications

Hollow Micro/Nanostructured Ceria‐Based Materials: Synthetic Strategies and Versatile Applications

Nitrogen doped graphite felt decorated with porous Ni1.4Co1.6S4 nanosheets for 3D pseudocapacitor electrodes

Hybrid Supercapacitors Based on Interwoven CoO‐NiO‐ZnO Nanowires and Porous Graphene Hydrogel Electrodes with Safe Aqueous Electrolyte for High Supercapacitance

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Nitrogen doped graphite felt decorated with porous Ni_1.4Co_1.6S₄ nanosheets for 3D pseudocapacitor electrodes