A strategy for the synthesis of VN@C and VC@C core–shell composites with hierarchically porous structures and large specific surface areas for high performance symmetric supercapacitors

2018 ◽  
Vol 47 (24) ◽  
pp. 8052-8062 ◽  
Author(s):  
Yifu Zhang ◽  
Jiqi Zheng ◽  
Xuyang Jing ◽  
Changgong Meng
Keyword(s):  
Thermal Treatment ◽  
Electrochemical Performance ◽  
Specific Surface ◽  
High Performance ◽  
Core Shell ◽  
Porous Structures ◽  
Hierarchically Porous ◽  
Surface Areas ◽  
Specific Surface Areas ◽  
Novel Strategy

A novel strategy for the fabrication of VN@C and VC@C was developed by the thermal treatment with H2V3O8@C under N2 and Ar atmospheres. VN@C SSC device exhibited better electrochemical performance than VC@C SSC device.

Pore Structure of TiO2- Modified ZrO2 Particles Prepared by the Glycothermal Method

2020 ◽  
Vol 38 ◽  
pp. 17-22
Author(s):  
Fuya Sugiyama ◽  
Shunsuke Hayashi ◽  
Shinji Iwamoto
Keyword(s):  
Thermal Stability ◽  
Thermal Treatment ◽  
Pore Structure ◽  
High Performance ◽  
Spherical Particles ◽  
Size Distributions ◽  
Catalytic Materials ◽  
Surface Areas ◽  
Pore Size Distributions ◽  
Specific Surface Areas

Titania-modified zirconias with different Ti/Zr ratios were synthesized via thermal treatment of zirconium (IV) tetra-n-propoxide and titanium (IV) tetra-iso-propoxide in 1,4-butanediol at 300 °C. The obtained products were spherical particles composed of nanocrystals with the tetragonal ZrO2 structure. The products had large specific surface areas, large pore volumes, and relatively narrow pore size distributions in the mesopore region. After calcination at high temperatures, the obtained TiO2-modified ZrO2 samples preserved large surface areas and pore structure. Having these superior thermal stability and pore structure, the obtained TiO2-modified ZrO2 particles are expected to show high performance as catalytic materials.

Growth and electrochemical performance of porous NiMn2O4 nanosheets with high specific surface areas

2015 ◽  
Vol 19 (10) ◽  
pp. 3169-3175 ◽  
Author(s):  
Hailong Yan ◽  
Tong Li ◽  
Kangwen Qiu ◽  
Yang Lu ◽  
Jinbing Cheng ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Specific Surface ◽  
Surface Areas ◽  
Specific Surface Areas

Facile synthesis of porous organic polymers for the absorption of Pd(ii) ions and organic dyes

RSC Advances ◽  
2016 ◽  
Vol 6 (83) ◽  
pp. 79781-79791 ◽  
Author(s):  
Yanmei Luo ◽  
Junhui Ran ◽  
Rong Chen ◽  
Xinjian Cheng
Keyword(s):  
Reaction Time ◽  
Specific Surface ◽  
Pore Diameter ◽  
Organic Dyes ◽  
Porous Structures ◽  
High Adsorption ◽  
Facile Synthesis ◽  
Surface Areas ◽  
Adsorption Capacities ◽  
Specific Surface Areas

Two kinds of POPs were synthesized with unique porous structures, considerable specific surface areas and high adsorption capacities. The specific surface area and pore diameter could be adjusted via changing the reaction time and temperature.

Synthesis and Characterization of Hydrotalcites: [Zn1−xAlx(OH)2](CO3)x/2·mH2O; x=0.25−0.66

1996 ◽  
Vol 454 ◽  
Author(s):  
M. A. Valenzuela ◽  
E. López-Salinas ◽  
B. Zapata ◽  
J. A. Montoya
Keyword(s):  
Thermal Treatment ◽  
Specific Surface ◽  
Calcination Temperature ◽  
Layered Structure ◽  
Synthesis And Characterization ◽  
Surface Areas ◽  
Constant Ph ◽  
Specific Surface Areas ◽  
Pure Phases

ABSTRACTIn this work a series of [Zn1−xAlx(OH)2](CO3)x/2·mH2O; x=0.25−0.66 were prepared at constant pH in order to study the effect of the thermal treatment on their crystalline srtucture. It was found that is possible to obtain pure Zn-Al hydrotalcite materials within a x = 0.25−0.50 range in comparison with Mg-Al hydrotalcites which yield pure phases in more restricted x ranges (0.25−0.33). All Zn-Al hydrotalcites lost their layered structure at temperatures above 473 K being less stable than their parental Mg-Al hydotalcite (623 K). Specific surface areas of these materials depended strongly on the Zn/Al ratio and calcination temperature, ranging from 280 to 20 m2/g. ZnO and ZnAl2O4 compounds were detected as the calcination products at temperatures higher than 873 K.

scholarly journals Role of pulping process as synergistic treatment on performance of agro-based activated carbons

2019 ◽  
Vol 6 (7) ◽  
pp. 190579 ◽  
Author(s):  
Altaf H. Basta ◽  
Vivian F. Lotfy ◽  
Philippe Trens
Keyword(s):  
Specific Surface ◽  
High Performance ◽  
Activated Carbons ◽  
Sorption Properties ◽  
Surface Areas ◽  
Pseudo Second Order ◽  
Specific Surface Areas ◽  
The One ◽  
Reported Data ◽  
The Impact

To recommend the beneficial effect of the pulping process on enhancing agro-wastes as precursors for the production of high-performance activated carbons (ACs), different pulping methods (alkali, sulfite and neutral sulfite) were applied on two available Egyptian agriculture by-products (rice straw and sugar cane bagasse), using the one-step pyrolysis method and H 3 PO 4 activating agent. The adsorption performance of the different prepared ACs was evaluated in terms of Iodine Numbers and their sorption properties for removing the methylene blue (MB) from aqueous solutions. The corresponding sorption processes were also analysed using Lagergren first order, pseudo-second order and intraparticle diffusion models. Data revealed that the applied pulping conditions were effective for removing the non-cellulosic constituents of agro-residues. This was demonstrated by the hydrogen/carbon and oxygen/carbon ratios, thermal stability and IR-measurements of the final pulps. These data were effective on the particular sorption properties of RS and SCB-based ACs. Interestingly, the pulping process is a profound modification of the SCB-based fibres, on which it induced a clear increase of the specific surface areas of the corresponding ACs even though they had an impact on the sorption of MB and iodine. These values are superior to the reported data on agro-based ACs with H 3 PO 4 activators. Pulping processes therefore play a dual role in the sorption properties of ACs. The first important role is the impact on the specific surface areas and the second impact is a profound modification of the surface chemistry of the ACs. Therefore, SCB-based ACs can be seen as an economical breakthrough product, and an alternative to the high-cost commercial ACs for the purification of industrial wastewaters.

scholarly journals Pyrrole-Based Conjugated Microporous Polymers as Efficient Heterogeneous Catalysts for Knoevenagel Condensation

2021 ◽  
Vol 9 ◽  
Author(s):  
Ruidong Gao ◽  
Guang Zhang ◽  
Fanli Lu ◽  
Long Chen ◽  
Yang Li
Keyword(s):  
Specific Surface ◽  
High Performance ◽  
Heterogeneous Catalysts ◽  
Knoevenagel Condensation ◽  
Condensation Reaction ◽  
High Catalytic Activity ◽  
Microporous Polymers ◽  
Surface Areas ◽  
Specific Surface Areas ◽  
Conjugated Microporous Polymers

Conjugated microporous polymers (CMPs) with robust architectures, facilely tunable pore sizes and large specific surface areas have emerged as an important class of porous materials due to their demonstrated prospects in various fields, e.g. gas storage/separation and heterogeneous catalysis. Herein, two new pyrrole-based CMPs with large specific surface areas and good stabilities were successfully prepared by one-step oxidative self-polycondensation of 1,2,4,5-tetra (pyrrol-2-ly)benzene or 1,3,5-tri (pyrrol-2-ly)benzene, respectively. Interestingly, both CMPs showed very high catalytic activity toward Knoevenagel condensation reaction, which was attributed to the inherent pore channels, high specific surface areas and abundant nitrogen sites within CMPs. Additionally, both CMPs displayed excellent recyclability with negligible degradation after 10 cycles. This work provides new possibilities into designing novel nitrogen-rich high-performance heterogeneous catalysts.

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