scholarly journals Control of Shape and Size in Iron Fluoride Porous Sub-Microspheres: Consequences for Steric Hindrance Interaction

2021 ◽  
Vol 3 ◽  
Author(s):  
Weibing Song ◽  
Hongyu Lu ◽  
Wenlong Zhao ◽  
Xiaofei Cao ◽  
Lei Yan ◽  
...  
Keyword(s):  
Porous Structure ◽  
Steric Hindrance ◽  
Structural Control ◽  
High Performance ◽  
Retention Rate ◽  
Rate Capability ◽  
Peg 400 ◽  
Excellent Electrochemical Performance ◽  
Remaining Capacity ◽  
Iron Based

Iron-based fluorides are promising alternates for advanced sodium-free battery cathodes due to their large theoretical capacity. However, the rational structural control on the iron-based fluorides toward high-performance batteries is still challenging. To this end, a controllable porous structure on FeF3·0.33H2O sub-microspheres is achieved by a polyethylene glycol (PEG)-assisted hydrothermal method via adjusting the volume of PEG-400. Experimental and molecular dynamic results verify that the formation of small amethyst-like sub-microspheres is mainly ascribed to the steric hindrance reaction of PEG-400, which makes it difficult for F− to combine with Fe3+ to form coordination bonds, and partially hinders the nucleation and growth of FeF3·0.33H2O nanospheres. As a sodium-free battery cathode, the FeF3·0.33H2O sub-microspheres with porous structure and smaller particle size exhibit excellent electrochemical performance with regard to cycle capacity and rate capability (a remaining capacity of 328 mAh g−1 and up to 95.3% retention rate when backs to 0.1 C after 60 cycles).

Three-Dimensional MoS2/Graphene Hybrid Aerogel as Free-Standing, High-Performance Electrode for Supercapacitor

NANO ◽  
2020 ◽  
Vol 15 (05) ◽  
pp. 2050062
Author(s):  
Zhaolei Meng ◽  
Xiaojian He ◽  
Song Han ◽  
Zijian Hu
Keyword(s):  
Porous Structure ◽  
Surface Area ◽  
High Performance ◽  
Large Scale ◽  
Low Cost ◽  
Hydrothermal Process ◽  
Three Dimensional ◽  
Rate Capability ◽  
Free Standing ◽  
Hybrid Aerogel

Carbon materials are generally employed as supercapacitor electrodes due to their low- cost, high-chemical stability and environmental friendliness. However, the design of carbon structures with large surface area and controllable porous structure remains a daunt challenge. In this work, a three-dimensional (3D) hybrid aerogel with different contents of MoS2 nanosheets in 3D graphene aerogel (MoS2-GA) was synthesized through a facial hydrothermal process. The influences of MoS2 content on microstructure and subsequently on electrochemical properties of MoS2-GA are systematically investigated and an optimized mass ratio with MoS2: GA of 1:2 is chosen to achieve high mechanical robustness and outstanding electrochemical performance in the hybrid structure. Due to the large specific surface area, porous structure and continuous charge transfer network, such MoS2-GA electrodes exhibit high specific capacitance, good rate capability and excellent cyclic stability, showing great potential in large-scale and low-cost fabrication of high-performance supercapacitors.

A facile route to well-dispersed Ru nanoparticles embedded in self-templated mesoporous carbons for high-performance supercapacitors

2019 ◽  
Vol 7 (35) ◽  
pp. 20208-20222 ◽  
Author(s):  
M. Aftabuzzaman ◽  
Chang Ki Kim ◽  
Tomasz Kowalewski ◽  
Krzysztof Matyjaszewski ◽  
Hwan Kyu Kim
Keyword(s):  
Electrochemical Performance ◽  
High Performance ◽  
Rate Capability ◽  
Mesoporous Carbons ◽  
Ru Nanoparticles ◽  
Excellent Electrochemical Performance ◽  
Very High ◽  
Good Rate Capability ◽  
Facile Route

Ru-NPs-embedded self-templated mesoporous carbons were successfully prepared by a facile route. They show excellent electrochemical performance with very high specific gravimetric capacitance, good rate capability, and excellent long-term cycling stability.

scholarly journals Synthesis of Benzoxazine-Based N-Doped Mesoporous Carbons as High-Performance Electrode Materials

2020 ◽  
Vol 10 (1) ◽  
pp. 422
Author(s):  
Haihan Zhang ◽  
Li Xu ◽  
Guoji Liu
Keyword(s):  
Specific Capacitance ◽  
High Performance ◽  
Electrode Materials ◽  
Carbon Materials ◽  
Retention Rate ◽  
High Specific Capacitance ◽  
Mesoporous Structure ◽  
Electrode System ◽  
Excellent Electrochemical Performance ◽  
Nitrogen Doped Carbon

In this work, nitrogen-doped carbon materials (NCMs) were prepared using aniline-phenol benzoxazine (BOZ) or aniline-cardanol benzoxazine as the carbon precursor and SBA-15 as the hard template. The effects of the carbonization temperature (700, 800, and 900 °C) and different nitrogen contents on the electrochemical properties of carbon materials were investigated. The samples synthesized using aniline-phenol benzoxazine as precursors and treated at 900 °C (NCM-900) exhibited an excellent electrochemical performance. The specific capacitance was 460 F/g at a current density of 0.25 A/g and the cycle stability was excellent (96.1% retention rate of the initial capacitance after 2000 cycles) in a 0.5 M H2SO4 electrolyte with a three-electrode system. Furthermore, NCM-900 also exhibited a high specific capacitance, comparable energy/power densities, and excellent cycling stability using a symmetrical electrode system. The characterization of the morphology and structure of the materials suggests it possessed an ordered mesoporous structure and a large specific surface area. NCM-900 could thus be considered a promising electrode material for supercapacitors.

Larch-derived hierarchical nitrogen-doped carbon with echinus-like architecture for supercapacitor applications

Holzforschung ◽  
2020 ◽  
Vol 74 (5) ◽  
pp. 529-538
Author(s):  
Honglei Chen ◽  
Lei Sha ◽  
Yujie Zhang ◽  
Shoujuan Wang ◽  
Fangong Kong ◽  
...  
Keyword(s):  
Porous Structure ◽  
High Performance ◽  
High Specific Capacitance ◽  
Hierarchical Porous Structure ◽  
Nitrogen Doped ◽  
Excellent Electrochemical Performance ◽  
Hierarchical Porous ◽  
Nitrogen Doped Carbon ◽  
Performance Rate

AbstractEchinus-like nitrogen-doped carbon with a hierarchical porous structure was synthesized from green larch waste and urea via liquid in situ doping and high-temperature carbonization. Benefitting from a large specific surface area (649 m2 g−1) and hierarchical porous structure, the nitrogen-doped carbon exhibited excellent electrochemical performance for supercapacitors. Remarkably, the echinus-like nitrogen-doped carbon achieved a high specific capacitance of 340 F g−1 at a current density of 1 A g−1 in 6 M KOH electrolyte as well as a good performance rate and stability (with a capacitance retention of 98% after 5000 cycles). This capacitance was almost 1.5 times higher than that of undoped carbon due to the contribution of the pseudocapacitance from the nitrogen doping. Larch sawdust is a promising carbon source for fabricating inexpensive, sustainable and high-performance supercapacitor materials.

scholarly journals High-performance asymmetric supercapacitor made of NiMoO4 nanorods@Co3O4 on a cellulose-based carbon aerogel

2020 ◽  
Vol 11 ◽  
pp. 240-251 ◽  
Author(s):  
Meixia Wang ◽  
Jing Zhang ◽  
Xibin Yi ◽  
Benxue Liu ◽  
Xinfu Zhao ◽  
...  
Keyword(s):  
Porous Structure ◽  
High Performance ◽  
Rate Capability ◽  
Negative Electrode ◽  
Carbon Aerogel ◽  
Maximum Energy ◽  
Asymmetric Supercapacitor ◽  
Hierarchical Porous Structure ◽  
Ternary Composite ◽  
Hierarchical Porous

In this study, a new nanoporous material comprising NiMoO4 nanorods and Co3O4 nanoparticles derived from ZIF-67 supported by a cellulose-based carbon aerogel (CA) has been successfully synthesized using a two-step hydrothermal method. Due to its chemical composition, the large specific surface and the hierarchical porous structure, the NiMoO4@Co3O4/CA ternary composite yields electrodes with an enhanced specific capacitance of 436.9 C/g at a current density of 0.5 A/g and an excellent rate capability of 70.7% capacitance retention at 5.0 A/g. Moreover, an advanced asymmetric supercapacitor (ASC) is assembled using the NiMoO4@Co3O4/CA ternary composite as the positive electrode and activated carbon as the negative electrode. The ASC device exhibits a large capacitance of 125.4 F/g at 0.5 A/g, a maximum energy density of 34.1 Wh/kg at a power density of 208.8 W/kg as well as a good cyclic stability (84% after 2000 cycles), indicating its wide applicability in energy storage. Finally, our results provide a general approach to the construction of CA and MOF-based composite materials with hierarchical porous structure for potential applications in supercapacitors.

Electrochemical properties and morphological evolution of pitaya-like Sb@C microspheres as high-performance anode for sodium ion batteries

2015 ◽  
Vol 3 (10) ◽  
pp. 5708-5713 ◽  
Author(s):  
Lin Wu ◽  
Haiyan Lu ◽  
Lifen Xiao ◽  
Xinping Ai ◽  
Hanxi Yang ◽  
...  
Keyword(s):  
High Performance ◽  
Morphological Evolution ◽  
Rate Capability ◽  
High Rate ◽  
Drying Method ◽  
High Rate Capability ◽  
Capacity Retention ◽  
Aerosol Spray ◽  
Excellent Electrochemical Performance ◽  
Ion Storage

Pitaya-like Sb@C microspheres are prepared successfullyviaa facile aerosol spray drying method, which present a high initial capacity, good capacity retention and high rate capability for Na-ion storage. Morphological evolution reveals that the maintenance of the pitaya-like configuration guarantees excellent electrochemical performance.

Layer-by-layer assembly modification to prepare firmly bonded Si–graphene composites for high-performance anodes

RSC Advances ◽  
2016 ◽  
Vol 6 (6) ◽  
pp. 4835-4842 ◽  
Author(s):  
Wenhui Zhang ◽  
Lin Wu ◽  
Lijuan Du ◽  
Lu Yue ◽  
Rongfeng Guan ◽  
...  
Keyword(s):  
High Performance ◽  
Retention Rate ◽  
High Capacity ◽  
Rate Capability ◽  
Cycling Performance ◽  
Thermal Reduction ◽  
Layer By Layer ◽  
Capacity Retention ◽  
Graphene Composite ◽  
New Si

A new Si–graphene composite was fabricated by a facile LBL technique followed by thermal reduction, which exhibited excellent cycling performance and rate capability as an anode, showing a high capacity retention rate of 92.0% over 100 cycles.

Rational design of self-supported Ni3S2 nanoparticles as a battery type electrode material for high-voltage (1.8 V) symmetric supercapacitor applications

CrystEngComm ◽  
2021 ◽  
Author(s):  
Muhammad Sajjad ◽  
Yaqoob Khan
Keyword(s):  
Energy Density ◽  
Electrochemical Performance ◽  
High Voltage ◽  
Electrode Material ◽  
High Performance ◽  
Rational Design ◽  
Rate Capability ◽  
Excellent Electrochemical Performance ◽  
Symmetric Supercapacitor ◽  
Supercapacitor Applications

We developed a high performance SSC device with excellent electrochemical performance in terms of specific capacitance, rate capability, energy density and power density which surpasses most of the reports.

Superionic Lithium Intercalation through 2 nm x 2 nm Columns in the Crystallographic Shear Phase Nb18W8O69

2019 ◽  
Author(s):  
Kent Griffith ◽  
Clare Grey
Keyword(s):  
High Performance ◽  
Rate Capability ◽  
Block Size ◽  
Lithium Intercalation ◽  
Resonance Spectroscopy ◽  
Complex Metal Oxides ◽  
Battery Electrode ◽  
Crystallographic Shear ◽  
Battery Material ◽  
First Time

Nb18W8O69 (9Nb2O5×8WO3) is the tungsten-rich end-member of the Wadsley–Roth crystallographic shear (cs) structures within the Nb2O5–WO3 series. It has the largest block size of any known, stable Wadsley–Roth phase, comprising 5 ´ 5 units of corner-shared MO6 octahedra between the shear planes, giving rise to 2 nm ´ 2 nm blocks. Rapid lithium intercalation is observed in this new candidate battery material and 7Li pulsed field gradient nuclear magnetic resonance spectroscopy – measured in a battery electrode for the first time at room temperature – reveals superionic lithium conductivity. In addition to its promising rate capability, Nb18W8O69 adds a piece to the larger picture of our understanding of high-performance Wadsley–Roth complex metal oxides.

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