Scalable construction of heteroatom-doped and hierarchical core–shell MnO2 nanoflakes on mesoporous carbon for high performance supercapacitor devices

2020 ◽  
Vol 7 (2) ◽  
pp. 411-420
Author(s):  
Xue Bai ◽  
Dianxue Cao ◽  
Hongyu Zhang
Keyword(s):  
Mesoporous Carbon ◽  
High Performance ◽  
High Energy ◽  
Cycling Stability ◽  
Core Shell ◽  
Power Densities ◽  
Shell Composite ◽  
Asymmetric Device

Combining interfacial methods and mesoporous carbon channels, an asymmetric device, using N,S-codoped mesoporous carbon and a MnO2@MC-30 core shell composite, is assembled with high energy, power densities and outstanding cycling stability.

Vacancies-engineered MoO3 and Na+-preinserted MnO2 in-situ grown N-doped graphene nanotubes as electrode materials for high-performance asymmetric supercapacitor

2021 ◽  
Author(s):  
Jian Zhao ◽  
He Cheng ◽  
Huanyu Li ◽  
Yan-Jie Wang ◽  
Qingyan Jiang ◽  
...  
Keyword(s):  
High Performance ◽  
Electrode Materials ◽  
High Energy ◽  
Cooperative Effect ◽  
Electrochemical Energy Storage ◽  
Asymmetric Supercapacitor ◽  
Asymmetric Supercapacitors ◽  
Doped Graphene ◽  
Power Densities

Developing advanced negative and positive electrode materials for asymmetric supercapacitors (ASCs) as the electrochemical energy storage can enable the device to reach high energy/power densities resulting from the cooperative effect...

SiO2@NiO core–shell nanocomposites as high performance anode materials for lithium-ion batteries

RSC Advances ◽  
2015 ◽  
Vol 5 (77) ◽  
pp. 63012-63016 ◽  
Author(s):  
Yourong Wang ◽  
Wei Zhou ◽  
Liping Zhang ◽  
Guangsen Song ◽  
Siqing Cheng
Keyword(s):  
Lithium Ion Batteries ◽  
Anode Materials ◽  
High Performance ◽  
Coulombic Efficiency ◽  
Rate Capability ◽  
Lithium Ion ◽  
Cycling Stability ◽  
Core Shell ◽  
Excellent Cycling Stability

A SiO2@NiO core–shell electrode exhibits almost 100% coulombic efficiency, excellent cycling stability and rate capability after the first few cycles.

scholarly journals Achieving high strength and ductility in ODS-W alloy by employing oxide@W core-shell nanopowder as precursor

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Zhi Dong ◽  
Zongqing Ma ◽  
Liming Yu ◽  
Yongchang Liu
Keyword(s):  
High Temperature ◽  
Metal Matrix ◽  
High Performance ◽  
High Energy ◽  
Core Shell ◽  
Microstructural Stability ◽  
Oxide Particles ◽  
Ods Alloy ◽  
Prepared Alloy ◽  
Strength And Ductility

AbstractWith excellent creep resistance, good high-temperature microstructural stability and good irradiation resistance, oxide dispersion strengthened (ODS) alloys are a class of important alloys that are promising for high-temperature applications. However, plagued by a nerve-wracking fact that the oxide particles tend to aggregate at grain boundary of metal matrix, their improvement effect on the mechanical properties of metal matrix tends to be limited. In this work, we employ a unique in-house synthesized oxide@W core-shell nanopowder as precursor to prepare W-based ODS alloy. After low-temperature sintering and high-energy-rate forging, high-density oxide nanoparticles are dispersed homogeneously within W grains in the prepared alloy, accompanying with the intergranular oxide particles completely disappearing. As a result, our prepared alloy achieves a great enhancement of strength and ductility at room temperature. Our strategy using core-shell powder as precursor to prepare high-performance ODS alloy has potential to be applied to other dispersion-strengthened alloy systems.

An all-solid-state asymmetric device based on a polyaniline hydrogel for a high energy flexible supercapacitor

2017 ◽  
Vol 41 (1) ◽  
pp. 237-244 ◽  
Author(s):  
Hamid Heydari ◽  
Mohammad B. Gholivand
Keyword(s):  
Solid State ◽  
Energy Density ◽  
High Performance ◽  
High Energy ◽  
Gel Electrolyte ◽  
Asymmetric Supercapacitor ◽  
Flexible Supercapacitor ◽  
Asymmetric Device

3D porous PANI hydrogel and a gel electrolyte were used to fabricate a high performance, all-solid-state, flexible asymmetric supercapacitor with an energy density of up to 6.16 mW h cm−3.

Core–Shell Structured NiCo2O4@ZnCo2O4 Nanomaterials with High Energy Density for Hybrid Capacitors

2021 ◽  
Vol 16 (7) ◽  
pp. 1134-1142
Author(s):  
Wenduo Yang ◽  
Jun Xiang ◽  
Sroeurb Loy ◽  
Nan Bu ◽  
Duo Cui ◽  
...  
Keyword(s):  
Energy Density ◽  
Electrode Material ◽  
Composite Electrode ◽  
Electrode Materials ◽  
Structural Characteristics ◽  
High Energy ◽  
High Energy Density ◽  
Core Shell ◽  
Shell Composite ◽  
Hybrid Capacitors

NiCo2O4 as an electrode material for supercapacitors (SCs) has been studied by a host of researchers due to its unique structural characteristics and high capacitance. However, its performance has not yet reached the level of practical applications.it is an effective strategy to synthesize composite electrode materials for tackling the problem. Herein, NiCo2O4@ZnCo2O4 as a novel core–shell composite electrode material has been fabricated through a two-step simple hydrothermal method. The as-prepared sample can be directly used as cathode material of a supercapacitor, and its specific capacitance is 463.1 C/g at 1 A/g. An assembled capacitor has an energy density of 77 Wh·kg−1 at 2700 W·kg−1, and after 8000 cycles, 88% of the initial capacity remains.

A three-dimensional graphene framework-enabled high-performance stretchable asymmetric supercapacitor

2018 ◽  
Vol 6 (4) ◽  
pp. 1802-1808 ◽  
Author(s):  
Ke Li ◽  
Yanshan Huang ◽  
Jingjing Liu ◽  
Mansoor Sarfraz ◽  
Phillips O. Agboola ◽  
...  
Keyword(s):  
Energy Density ◽  
High Performance ◽  
Three Dimensional ◽  
High Energy ◽  
Cycling Stability ◽  
High Energy Density ◽  
Asymmetric Supercapacitor ◽  
Asymmetric Supercapacitors ◽  
Superior Cycling Stability

Three-dimensional graphene frameworks enable the development of stretchable asymmetric supercapacitors with a record high energy density of 77.8 W h kg−1, and also excellent stretchability and superior cycling stability.

Facile Preparation of Holey Anderson-type Polyoxometalate/Polyaniline/Graphene Nanocomposites for Supercapacitors

NANO ◽  
2019 ◽  
Vol 14 (04) ◽  
pp. 1950049 ◽  
Author(s):  
Jingjing Lin ◽  
Song Yan ◽  
Xiaojie Zhang ◽  
Yueran Liu ◽  
Jun Lian ◽  
...  
Keyword(s):  
Hybrid Materials ◽  
High Performance ◽  
High Specific Capacitance ◽  
High Energy ◽  
Cycling Stability ◽  
High Energy Density ◽  
Graphene Nanocomposites ◽  
Graphene Layers ◽  
Cycle Times ◽  
Excellent Electrochemical Performance

Holey Fe-Anderson-type polyoxometalate/polyaniline/graphene (PPG) hybrid materials were first prepared by anchoring Anderson-type polyoxometalates [FeMo6O[Formula: see text]H6][Formula: see text] (FeMo[Formula: see text] onto graphene modified with polyaniline via a facile hydrothermal treatment. The as-prepared materials exhibited an excellent electrochemical performance with a high specific capacitance of 1366 F g[Formula: see text] at 1 A g[Formula: see text] and outstanding cycling stability (97.6% capacitance retention after 5000 cycle times). The uptake of polyaniline/FeMo6 nanoparticles on graphene not only provided the pseudocapacitance but also weakened the aggregation between the graphene layers, resulting in a higher surface area compared with pure graphene. In addition, the AC//PPG-15 asymmetric supercapacitor device showed a high energy density of 24.65[Formula: see text]W h kg[Formula: see text] at a low power density of 326.25[Formula: see text]W kg[Formula: see text] and good cycling stability (94.82% capacitance retention after 5000 cycles). Hence, the as-prepared PPG hybrid materials in this work possess tremendous potential as electrodes for high-performance supercapacitors.

THERMODYNAMIC AND KINETIC ANALYSES OF SYNTHESIZING ZrB2@Al(OH)3–Y(OH)3 CORE–SHELL COMPOSITE PARTICLES

2007 ◽  
Vol 14 (01) ◽  
pp. 117-122 ◽  
Author(s):  
JIEGUANG SONG ◽  
LIANMENG ZHANG ◽  
JUNGUO LI ◽  
JIANRONG SONG
Keyword(s):  
High Temperature ◽  
High Performance ◽  
Solubility Product ◽  
Ceramic Materials ◽  
Precipitation Method ◽  
Composite Particles ◽  
Core Shell ◽  
High Temperature Strength ◽  
Co Precipitation ◽  
Shell Composite

ZrB 2 has some excellent performances, but it is easily oxidized at high temperatures to impact the high-temperature strength, which restricts its applied range. To protect from the oxidization and improve the strength of ZrB 2 at high temperature, the surface of ZrB 2 particles is coated with the Al ( OH )3– Y ( OH )3 shell to synthesize ZrB 2@ Al ( OH )3– Y ( OH )3 core–shell composite particles. Through the thermodynamic and kinetic analyses of the heterogeneous nucleation and homogeneous nucleation, the concentration product of precursor ion ( Y 3+ or Al 3+) and OH - (Qi) must be greater than the solubility product (K sp ), respectively; the conditions of Y 3+ and Al 3+ are reached to produce Al ( OH )3– Y ( OH )3 shell on the ZrB 2 surface between the Y 3+ line and the AlO 2- line. Through TEM and XRD analyses, ZrB 2@ Al ( OH )3– Y ( OH )3 core–shell composite particles are successfully synthesized by the co-precipitation method, the shell layer quality is better at pH = 9, which established the foundation for preparing high-performance YAG / ZrB 2 and Al 2 O 3– YAG / ZrB 2 multiphase ceramic materials.

Encapsulating silicon nanoparticles into mesoporous carbon forming pomegranate-structured microspheres as a high-performance anode for lithium ion batteries

2017 ◽  
Vol 5 (22) ◽  
pp. 11197-11203 ◽  
Author(s):  
Tong Shen ◽  
Xin-hui Xia ◽  
Dong Xie ◽  
Zhu-jun Yao ◽  
Yu Zhong ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
Hydrothermal Method ◽  
Mesoporous Carbon ◽  
High Performance ◽  
Silicon Nanoparticles ◽  
Lithium Ion ◽  
Cycling Stability ◽  
Mesoporous Microspheres ◽  
One Step ◽  
Rate Capacity

Pomegranate-structured Si/C mesoporous microspheres are fabricated by a facile one-step hydrothermal method with high cycling stability and superior rate capacity.

Sign in / Sign up

Export Citation Format

Share Document