Carbon materials with hierarchical porosity: Effect of template removal strategy and study on their electrochemical properties

Liu, Xiaowei; Liu, Xuehua; Sun, Baofen; Zhou, Heliang; Fu, Aiping; Wang, Yiqian; Guo, Yu‐Guo; Guo, Peizhi; Li, Hongliang

doi:10.1016/j.carbon.2018.01.046

Cited by 86 publications

(41 citation statements)

References 58 publications

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“…However, the surface becomes much smoother than that of the MnO 2 precursor (see Figure S2, Supporting Information), and this is due to the decomposition of MnO 2 , which leads to its collapse, and the crystallization of MnO during the thermal treatment. From Figure c,e, one can see that MnO@rGO and MnO@C/rGO share the similar size of quasispherical morphology but have wrinkled surface, which can be ascribed to the inhomogeneous shrinkage induced by the instantaneous drying effect during the spray‐drying process . From Figure d, it can be noted that MnO@rGO possesses a grainy surface, which is due to the existence of MnO nanoparticles anchored onto graphene sheets.…”

Section: Resultsmentioning

confidence: 86%

Spray‐Assisted Synthesis of MnO@C/Graphene Composites as Electrode Materials for Supercapacitors

et al. 2019

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The preparation of a composite consisting of amorphous carbon‐coated MnO nanoparticles deposited on graphene sheets (i.e., MnO@C/rGO) by a spray‐assisted method is reported. The MnO@C/rGO composite used as an active material for supercapacitors exhibits an excellent cyclability and a high specific capacitance in a two‐electrode system using 2 mol L−1 KOH aqueous solution as the electrolyte. High specific capacitances of 264 and 176 F g−1 at current densities of 1 and 20 A g−1, respectively, are achieved. A rate‐capability retention of about 67% is obtained when the current density increases from 1 to 20 A g−1, and the specific capacitance is retained at 78% after 10 000 cycles at a current density of 20 A g−1. The excellent electrochemical performance of the MnO@C/rGO is ascribed to the integration of graphene and the coating of amorphous carbon derived from glucose, which significantly improves the conductivity and alleviates the agglomeration of MnO. The unique architecture and good electrical conductivity increase the specific surface area and provide continuous electrical contact during the charge/discharge process. It is shown that carbon coating is an effective way to improve the electrochemical performance of metal oxides/graphene composites.

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Section: Resultsmentioning

confidence: 86%

Spray‐Assisted Synthesis of MnO@C/Graphene Composites as Electrode Materials for Supercapacitors

et al. 2019

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“…Despite some noise in the signal because of the high absorption capacity of the polymer, two scattering peaks (1,621 and 1,504 cm −1 ) due to the stretching vibrations of the CC double bonds in the furan ring were observed . During the formation of the Diels–Alder adduct, the CC stretching vibration at 1,773 cm −1 became weaker and the two peaks at 1,601 and 886 cm −1 disappeared due to the saturation of the furan ring . Two intense scattering peaks at 1,621 and 1,504 cm −1 arise from the stretching vibrations of a diene system in a furan ring.…”

Section: Resultsmentioning

confidence: 99%

Facile and green preparation of thermal and ph sensitive hydrogel microspheres based on spray drying and the diels–alder reaction

Wei

Yang

Chu

et al. 2019

Polymer Engineering & Sci

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Thermal and pH dual-sensitive hydrogel microspheres were fabricated using spray drying. During the spray drying, chemical crosslinks were formed in situ via the Diels-Alder reaction without the involvement of any catalysts or organic solvents. The structures and morphologies of the products were characterized by Fourier Transform infrared spectroscopy (FTIR), nuclear magnetic resonance (NMR), Raman spectroscopy, scanning electron microscopy (SEM), X-ray diffraction (XRD), and thermogravimetric analysis (TGA). A general weighing method was applied to study the swelling behavior of the microspheres at different temperatures and pHs. Using urea as a model molecule, the ability of the microspheres to control the release of urea was explored by spectrophotometry and calculated from the calibration curve obtained from the reaction of urea and diaminobenzaldehyde. The as-prepared microspheres show a reversible and reproducible volume change with varying pH or temperature, and their swelling ratios increase with increasing temperature or pH. Furthermore, the urea release rates can be tuned by changing the pH or the temperature. Since spray drying can easily produce microspheres on a large scale, the strategy demonstrated here has the potential for applications in the green preparation of hydrogel microspheres. FIG. 7. The swelling ratio of the HMP as a function of temperature (left) and the reversibility and repeatability of the swelling behavior of the HMP (right). FIG. 8. The swelling ratio of the HMP as a function of pH (left) and the reversibility and repeatability of the swelling behavior of the HMP (right).

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“…The carbon template is mainly removed by calcining in air. For target substances that are easily oxidized by air at high temperatures, carbon templates can be removed at high temperatures by oxygen [124]. Mesoporous carbon materials are generally obtained by the hard template method to replicate ordered mesoporous silica.…”

Section: Synthetic Methods Of Ordered Mesoporous Metal Oxidesmentioning

confidence: 99%

Designing and Fabricating Ordered Mesoporous Metal Oxides for CO2 Catalytic Conversion: A Review and Prospect

Cui

Lian

et al. 2019

Materials

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In the past two decades, great progress has been made in the aspects of fabrication and application of ordered mesoporous metal oxides. Ordered mesoporous metal oxides have attracted more and more attention due to their large surface areas and pore volumes, unblocked pore structure, and good thermal stabilities. Compared with non-porous metal oxides, the most prominent feature is their ability to interact with molecules not only on their outer surface but also on the large internal surfaces of the material, providing more accessible active sites for the reactants. This review carefully describes the characteristics, classification and synthesis of ordered mesoporous metal oxides in detail. Besides, it also summarizes the catalytic application of ordered mesoporous metal oxides in the field of carbon dioxide conversion and resource utilization, which provides prospective viewpoints to reduce the emission of greenhouse gas and the inhibition of global warming. Although the scope of current review is mainly limited to the ordered mesoporous metal oxides and their application in the field of CO2 catalytic conversion via heterogeneous catalysis processes, we believe that it will provide new insights and viewpoints to the further development of heterogeneous catalytic materials.

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Carbon materials with hierarchical porosity: Effect of template removal strategy and study on their electrochemical properties

Cited by 86 publications

References 58 publications

Spray‐Assisted Synthesis of MnO@C/Graphene Composites as Electrode Materials for Supercapacitors

Spray‐Assisted Synthesis of MnO@C/Graphene Composites as Electrode Materials for Supercapacitors

Facile and green preparation of thermal and ph sensitive hydrogel microspheres based on spray drying and the diels–alder reaction

Designing and Fabricating Ordered Mesoporous Metal Oxides for CO2 Catalytic Conversion: A Review and Prospect

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