One-pot fabrication of Co3O4 microspheres via hydrothermal method at low temperature for high capacity supercapacitor

Zhang, Jinfeng; Deng, Yida; Zhong, Cheng; Liu, Lei; Hu, Wenbin

doi:10.1016/j.mseb.2015.04.010

Cited by 30 publications

(8 citation statements)

References 36 publications

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“…The different morphologies and structures are closely related to the preparation methods. Cobalt oxide can be prepared by a variety of methods, such as high temperature solid phase reaction, chemical precipitation, electrodeposition and hydrothermal preparation . Hydrothermal preparation of cobalt oxide is the most common method.…”

Section: Catalystmentioning

confidence: 99%

“…Cobalt oxide can be prepared by a variety of methods, such as high temperature solid phase reaction, chemical precipitation, 112 electrodeposition 113 and hydrothermal preparation. 114 Hydrothermal preparation of cobalt oxide is the most common method. The preparation of Co 3 O 4 by hydrothermal method has a series of advantages such as high particle purity, good crystal shape, and easy control.…”

Section: Optimum Modification Of Cadmium Sulfidementioning

confidence: 99%

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The Current Progresses and Future Perspectives of Photoreactors and Catalysts Used in Photocatalytic Reduction of CO₂

Shu,

Guan,

Guo

et al. 2023

Ind. Eng. Chem. Res.

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Since the 21st century, with the increasing emissions of CO 2 -based greenhouse gases, it has been more and more urgent to seek new energy sources to build a low-carbon society. Among them, solar energy drives the conversion of CO 2 into hydrocarbon fuel technology, which has great potential. This paper reviews the recent development of the field of photocatalytic reduction of CO 2 , including the progress of reactors and common catalysts. Through the analysis of a large number of literature and experimental data, the author highlights several key points: First, the paper describes the effects of different types of reactor structures and process parameters on the photocatalytic reduction of CO 2 reactions, and reports an analysis of the influx state, temperature, light source, and fixation control of the catalyst. Second, the article focuses on the performance of different kinds of catalysts in photocatalytic CO 2 reduction reactions, including semiconductor catalysts, metal catalysts, and other catalysts that have appeared in recent years. The authors studied the development process, the modification method, and the influence of different structures on the reaction process and introduced the advantages and disadvantages of various catalysts, which provide guidance for finding more efficient and sustainable applications. Finally, this paper gives an overview of the problems and challenges mentioned in this study, discusses the methods and ways to further improve the reaction efficiency and catalyst stability, and proposes directions and ideas for future research. In conclusion, this article systematically reviews the important progress in the field of photocatalytic reduction of CO 2 , highlighting the development status and research progress of reactors and catalysts. It has important reference significance for the research and application of related disciplines.

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Section: Catalystmentioning

confidence: 99%

Section: Optimum Modification Of Cadmium Sulfidementioning

confidence: 99%

The Current Progresses and Future Perspectives of Photoreactors and Catalysts Used in Photocatalytic Reduction of CO₂

Shu,

Guan,

Guo

et al. 2023

Ind. Eng. Chem. Res.

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“…Other than NiO, hydrothermal methods also employed to synthesize Co 3 O 4 by directly growing the cobalt-hydroxide-carbonate intermediate on the surface of substrates in a solution containing cobalt precursor and urea [36]. followed by a recrystallization process [38]. Unlike ordinary preparation techniques involving high-temperature calcination step, Co 3 O 4 microspheres synthesized at 100 ºC hydrothermal temperature demonstrated excellent specific capacitance of 850 F g -1 at a current density of 1 A g -1 .…”

Section: Metal Oxides/hydroxidesmentioning

confidence: 99%

Hydrothermal Synthesis of Supercapacitors Electrode Materials

Wong

Juan

2018

Materials Research Foundations

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Nowadays, electrochemical capacitors have been considered as one of the important power sources to overcome the environmental problems such as depletion of fossil fuels and increase in energy demand. The electrochemical capacitors are considered promising energy storage devices because they store a large amount of energy in comparison to the conventional capacitors and deliver higher power than batteries. Electrochemical capacitor electrodes play a vital role in enhancing the electrochemical performance, especially their active materials (i.e., carbonaceous, transition metal oxide and conducting polymers). In general, carbonaceous materials exhibited large surface area and high conductivity and hence are widely used as electrode materials for electrical double-layer capacitor system. In contrast, transition metal oxides and conducting polymers have been adopted for fabrication of pseudocapacitor electrodes owing to their storage mechanisms. In order to fully utilize the advantages of electrical double-layer capacitors and pseudocapacitors, hybrid capacitors have attracted great attention in the field of electronic devices and electric vehicles. Thus, this chapter presents a critical review of recent developments of the hydrothermal synthesis technique for hybrid capacitors' electrodes in terms of their specific capacitance, voltage window, current density, cycling stability, and current density.

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“…Among them, Co 3 O 4 is regarded as a favorable candidate for supercapacitors due to its high theoretical capacity (890.00 mAh·g −1 )/specific capacitance (3560.00 F·g −1 ) [ 10 ], comparatively low cost, abundant oxidation states for reversibility, and good environmental affinity [ 11 ]. Co 3 O 4 with different structures (zero-dimensional spherical/octahedral/cubical nanoparticles [ 12 ], one-dimensional nanoneedles/nanowires [ 13 , 14 ] with high aspect ratio and nanotubes/nanorods/bundles [ 15 , 16 ] with low aspect ratio, two-dimensional regularly arranged nanosheets [ 17 , 18 ], and regularly-arranged nanobands [ 19 ]) has been synthesized by different methods, such as thermal decomposition of solid phase [ 20 ], hydrothermal synthesis [ 21 ], chemical vapor deposition [ 22 ], sol-gel method [ 23 ], or electrodeposition [ 24 ]. Among these methods, the hydrothermal method is widely used in the preparation of Co 3 O 4 electrode materials because of its low cost, good crystal shape, high purity, easy operation, high production, and uneasy reunion [ 25 ].…”

Section: Introductionmentioning

confidence: 99%

“…Feng et al [ 12 ] investigated the effect of hydrothermal temperature (90–110 °C) on Co 3 O 4 morphologies. A low temperature (90 °C) did not provide sufficient driving force for Co 3 O 4 recrystallization.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Honeycomb-Like Co3O4 Nanosheets with Excellent Supercapacitive Performance by Morphological Controlling Derived from the Alkaline Source Ratio

Jia

Lü

et al. 2018

Materials

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Honeycomb-like Co3O4 nanosheets with high specific surface area were successfully synthesized on porous nickel foam by the facile hydrothermal method followed by an annealing treatment (300 °C), which were used as high-performance supercapacitor electrodes. The effects of the mole ratio of hexamethylenetetramine (HMT) and Co(NO3)2 (1:1, 2:1, 3:1, 4:1, 5:1 and 6:1) as the reactants on the morphological evolution and electrochemical performance of the electrodes were investigated in detail. X-ray diffractometry (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM) were applied to characterize the structure and morphology of the products. The electrochemical performance was measured by cyclic voltammetry (CV) and galvanostatic charge/discharge. The mole ratio of HMT and Co(NO3)2 produced a significant effect on the morphological evolution of Co3O4. The morphological evolution of Co3O4 with the increase in the mole ratio was followed: the nanosheets accompanied with a large number of spherical nanoparticles → the formation of some strip-like particles due to the agglomeration of spherical nanoparticles → the formation of new nanosheets resulting from the growth of strip-like particles → the formation of coarse flower-like particles owing to the connection among the nanosheets → the nanosheets gradually covered with flower-like particles. Accompanied with the change, the specific surface area was increased firstly, and then decreased. A maximum was obtained at a HMT and Co(NO3)2 mole ratio of 4:1. The evolution in morphology of Co3O4 was responsible for the change in electrochemical performance of the electrode. The specific capacitance value of the electrode prepared at a HMT and Co(NO3)2 mole ratio of 4:1 was highest (743.00 F·g−1 at 1 A·g−1 in the galvanostatic charge/discharge test). The similar result was also observed in the CV test with a scanning rate of 5 mV·s−1. Moreover, the electrode also demonstrated an excellent cyclic performance, in which about 97% of the initial specific capacitance remained at 1 A·g−1 for 500 cycles in the galvanostatic charge/discharge test. This excellent electrochemical performance was ascribed to high specific surface area of Co3O4 nanosheets that provide added channels and space for the ions transportation.

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One-pot fabrication of Co3O4 microspheres via hydrothermal method at low temperature for high capacity supercapacitor

Cited by 30 publications

References 36 publications

The Current Progresses and Future Perspectives of Photoreactors and Catalysts Used in Photocatalytic Reduction of CO₂

The Current Progresses and Future Perspectives of Photoreactors and Catalysts Used in Photocatalytic Reduction of CO₂

Hydrothermal Synthesis of Supercapacitors Electrode Materials

Synthesis of Honeycomb-Like Co3O4 Nanosheets with Excellent Supercapacitive Performance by Morphological Controlling Derived from the Alkaline Source Ratio

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One-pot fabrication of Co3O4 microspheres via hydrothermal method at low temperature for high capacity supercapacitor

Cited by 30 publications

References 36 publications

The Current Progresses and Future Perspectives of Photoreactors and Catalysts Used in Photocatalytic Reduction of CO2

The Current Progresses and Future Perspectives of Photoreactors and Catalysts Used in Photocatalytic Reduction of CO2

Hydrothermal Synthesis of Supercapacitors Electrode Materials

Synthesis of Honeycomb-Like Co3O4 Nanosheets with Excellent Supercapacitive Performance by Morphological Controlling Derived from the Alkaline Source Ratio

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The Current Progresses and Future Perspectives of Photoreactors and Catalysts Used in Photocatalytic Reduction of CO₂

The Current Progresses and Future Perspectives of Photoreactors and Catalysts Used in Photocatalytic Reduction of CO₂