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Zhou Saisai

Bio: Zhou Saisai is an academic researcher from Jiangsu University. The author has contributed to research in topics: Supercapacitor & Capacitance. The author has an hindex of 11, co-authored 26 publications receiving 619 citations.

Papers
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Journal ArticleDOI
Gao Haiwen1, Xiaohong Wang1, Ganghu Wang1, Chen Hao1, Zhou Saisai1, Chengxiang Huang1 
TL;DR: Results indicate that the MCP-2//AC ASC will play an important role in energy structures in the future and is a good energy storage device that can support the function of two LEDs for 20 minutes.
Abstract: In recent years, the electrochemical properties of supercapacitors have been greatly improved due to continuous improvement in their composite materials. In this study, an urchin-like MgCo2O4@PPy/NF (MgCo2O4@polypyrrole/Ni foam) core–shell structure composite material was successfully developed as an electrode for supercapacitors. The MCP-2 composite material, obtained by a hydrothermal method and in situ chemical oxidative polymerization, shows a high specific capacitance of 1079.6 F g−1 at a current density of 1 A g−1, which is much higher than that of MC (783.6 F g−1) under the same conditions. Simultaneously, it has low resistance and an excellent cycling stability of 97.4% after 1000 cycles. Furthermore, an all-solid-state asymmetric supercapacitor (ASC) was assembled using MCP-2 as the positive electrode and activated carbon (AC) as the negative electrode. The MCP-2//AC ASC exhibits high specific capacitance (94 F g−1 at a current density of 0.4 A g−1), high energy density (33.4 W h kg−1 at a power density of 320 W kg−1), high volumetric energy density (17.18 mW h cm−3 at a volumetric power density of 0.16 W cm−3) and excellent cycling stability (retaining 91% of the initial value after 10 000 cycles). Simultaneously, the device has low leakage current and excellent self-discharge characteristics. All these results indicate that the MCP-2//AC ASC is a good energy storage device; it can support the function of two LEDs for 20 minutes. These results indicate that the MCP-2//AC ASC will play an important role in energy structures in the future.

125 citations

Journal ArticleDOI
TL;DR: In this article, NiCo2O4/N-rGO nanocomposites were prepared by using solvothermal method and hydrothermal method, and the specific surface area of the composite material reaches 99.38m2

117 citations

Journal ArticleDOI
TL;DR: The three-dimensional porous nanomaterial Co3O4/ZnCo2O 4/CuO with hollow polyhedral nanocage structures and highly enhanced electrochemical performances was synthesized successfully by a zeolitic imidazolate framework-67 route to show enhanced pseudocapacitive properties and good cycling stability.
Abstract: Zeolitic imidazolate frameworks have stimulated great attention due to their potential applications in energy storage, catalysis, gas sensing, drug delivery etc. In this paper, the three-dimensional porous nanomaterial Co3O4/ZnCo2O4/CuO with hollow polyhedral nanocage structures and highly enhanced electrochemical performances was synthesized successfully by a zeolitic imidazolate framework-67 route. The composites hold the shape of the ZIF-67 templates well and the shell has multiple compositions. In the process, we first synthesized the nanostructure hydroxide precursors and then transformed them into the corresponding metal oxide composites by thermal annealing in air. In addition, the mass ratio of Zn to Cu in this material is discussed and optimized. We found that when the mass ratio is 3, the composite material has better electrochemical properties. When applied as an electrode material, Co3O4/ZnCo2O4/CuO-1 shows enhanced pseudocapacitive properties and good cycling stability compared with Co3O4/ZnCo2O4, Co3O4/CuO and Co3O4/ZnCo2O4/CuO-2, and Co3O4/ZnCo2O4/CuO-3. The assembled Co3O4/ZnCo2O4/CuO-1//AC hybrid device can be reversibly cycled in a large potential range of 0–1.6 V and can deliver a high energy density of 35.82 W h kg−1 as well as the maximum power density of 4799.25 W kg−1.

109 citations

Journal ArticleDOI
Zhou Saisai1, Chen Hao1, Wang Junjie1, Xiaohong Wang1, Gao Haiwen1 
TL;DR: In this paper, a novel composite porous NiCo2O4/ZnCo 2O 4/Co3O 4 hollow polyhedral nanocage is prepared by etching and coprecipitation mechanism using the zeolitic imidazolate framework-67 as template, which can prevent the agglomeration of the metal caused by high temperature calcination.

98 citations

Journal ArticleDOI
TL;DR: In this paper, a hierarchical spinel NiCo2O4 nanowires were synthesized by a facile hydrothermal method followed by an annealing treatment, and the results reveal that the hierarchical mesoporous structured NiCo 2O4 exhibited corking supercapacitor performance with a high specific capacitance of 2876 F·g·g−1 at a current density of 1 A g−1, even increased to 10.0 A g −1, the capacitance retention reached 84.7% after 500 cycles, which indicates an excellent
Abstract: Hierarchical spinel NiCo2O4 nanowires were synthesized by a facile hydrothermal method followed by an annealing treatment. The prepared NiCo2O4 nanowires presented a hierarchical mesoporous structure. Moreover, the effects of precipitant and solvent on morphologies of NiCo2O4 were researched. The results reveal that the hierarchical mesoporous structured NiCo2O4 exhibited corking supercapacitor performance with a high specific capacitance of 2876 F·g–1 at a current density of 1 A g–1, even increased to 10.0 A g–1, the specific capacitance could still remain 1290 F g–1, what’s more, the capacitance retention reached 84.7% after 500 cycles, which indicates an excellent electrochemical performance. The results demonstrate hierarchical mesoporous NiCo2O4 potential to be a promising supercapacitor electrode materials and inspire furthered research on binary metal oxides as charge storage materials and offer a new route for the large-scale production of high-performance supercapacitor electrode materials.

81 citations


Cited by
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06 Aug 2020-Small
TL;DR: A method to distinguish battery-type and pseudocapacitive materials using the electrochemical signatures and quantitative kinetics analysis is outlined, and the distinction between asymmetric and hybrid supercapacitors is discussed.
Abstract: The development of pseudocapacitive materials for energy-oriented applications has stimulated considerable interest in recent years due to their high energy-storing capacity with high power outputs. Nevertheless, the utilization of nanosized active materials in batteries leads to fast redox kinetics due to the improved surface area and short diffusion pathways, which shifts their electrochemical signatures from battery-like to the pseudocapacitive-like behavior. As a result, it becomes challenging to distinguish "pseudocapacitive" and "battery" materials. Such misconceptions have further impacted on the final device configurations. This Review is an earnest effort to clarify the confusion between the battery and pseudocapacitive materials by providing their true meanings and correct performance metrics. A method to distinguish battery-type and pseudocapacitive materials using the electrochemical signatures and quantitative kinetics analysis is outlined. Taking solid-state supercapacitors (SSCs, only polymer gel electrolytes) as an example, the distinction between asymmetric and hybrid supercapacitors is discussed. The state-of-the-art progress in the engineering of active materials is summarized, which will guide for the development of real-pseudocapacitive energy storage systems.

328 citations

Journal ArticleDOI
Xu Zhang1, An Chen1, Ming Zhong1, Zihe Zhang1, Xin Zhang1, Zhen Zhou1, Xian-He Bu1 
03 Apr 2019
TL;DR: In this paper, the latest progress and breakthrough in the application of MOF and MOF-derived materials for energy storage and conversion devices are summarized, including Li-based batteries (Li-ion, Li-S and Li-O2 batteries), Na-ion batteries, supercapacitors, solar cells and fuel cells.
Abstract: As modern society develops, the need for clean energy becomes increasingly important on a global scale. Because of this, the exploration of novel materials for energy storage and utilization is urgently needed to achieve low-carbon economy and sustainable development. Among these novel materials, metal–organic frameworks (MOFs), a class of porous materials, have gained increasing attention for utilization in energy storage and conversion systems because of ultra-high surface areas, controllable structures, large pore volumes and tunable porosities. In addition to pristine MOFs, MOF derivatives such as porous carbons and nanostructured metal oxides can also exhibit promising performances in energy storage and conversion applications. In this review, the latest progress and breakthrough in the application of MOF and MOF-derived materials for energy storage and conversion devices are summarized, including Li-based batteries (Li-ion, Li–S and Li–O2 batteries), Na-ion batteries, supercapacitors, solar cells and fuel cells.

243 citations

Journal ArticleDOI
TL;DR: In this article, an asymmetric supercapacitor with the GC/MoO3-x and GC/MnO2 nanocomposites as anode and cathode, respectively, exhibits an ultrahigh energy of 150'Wh'kg−1, corresponding to an impressive volumetric energy density of 319'Wh´L−1.

235 citations

Journal ArticleDOI
TL;DR: In this paper, a review of the most commonly used methods for making the core and shell materials over the past decade (2007-2018), and points out the most efficient combination of the material categories and morphologies for the core/shell structure.
Abstract: Supercapacitors (SCs) have attracted much attention as energy storage devices due to their high power density, fast charge/discharge capability, and long cycling life. The core/shell structure design of the electrocapacitive material is one of the effective ways to achieve large surface area and high conductivity for providing more faradaic reaction sites and accelerating the charge transfer, respectively, and therefore to enhance the electrocapacitive performance of SCs. To better understand the core/shell structure, this review paper compares the material category, morphology, and synthesis methods for the core/shell structures as well as their electrochemical performances for the corresponding SCs. The electroactive materials applied in the core/shell structure include carbon materials, conducting polymers, metals, metal hydroxides, metal oxides and metal sulfides, while zero-dimensional, one-dimensional, two-dimensional, and three-dimensional structures are considered for the core/shell material. This review article outlines the most commonly used methods for making the core and shell materials over the past decade (2007–2018), and points out the most efficient combination of the material categories and morphologies for the core/shell structure. By understanding the details of the core/shell materials, more efficient design regarding the choices of material category and morphology can be achieved, and therefore better electrocapacitive performance for the resulting SCs can be realized.

166 citations

Journal ArticleDOI
TL;DR: The results show that Fe3O4/C-ACLS can remove 98%, 92% and 99% of Congo red, Titan yellow and Eriochrome blue black R, respectively and the adsorption process conforms to pseudo-second-order kinetics model, and the diffusion rate is controlled by many steps.

164 citations