Ultrathin WS2 nanosheets vertically embedded in a hollow mesoporous carbon framework – a triple-shell structure with enhanced lithium storage and electrocatalytic properties

2018 ◽  
Vol 6 (39) ◽  
pp. 19004-19012 ◽  
Author(s):  
Xiue Zhang ◽  
Rongfang Zhao ◽  
Qianhui Wu ◽  
Wenlong Li ◽  
Chao Shen ◽  
...  
Keyword(s):  
Structural Stability ◽  
Shell Structure ◽  
Mesoporous Carbon ◽  
Active Sites ◽  
High Conductivity ◽  
Lithium Storage ◽  
Electrocatalytic Properties ◽  
Carbon Framework ◽  
Ws2 Nanosheets

HTSHNs WS2/C with ultrathin WS2 nanosheets vertically embedded in HMCSs provide abundant active sites, high conductivity and superior structural stability.

Mesoporous graphene/carbon framework embedded with SnO2 nanoparticles as a high-performance anode for lithium storage

2017 ◽  
Vol 4 (5) ◽  
pp. 889-897 ◽  
Author(s):  
Xiongwei Wang ◽  
Ludan Zhang ◽  
Congcong Zhang ◽  
Peiyi Wu
Keyword(s):  
Mesoporous Carbon ◽  
High Performance ◽  
Sno2 Nanoparticles ◽  
Lithium Storage ◽  
Carbon Framework ◽  
Long Life

A uniform graphene-based mesoporous carbon framework as a robust matrix for embedding SnO2 nanoparticles for long-life lithium storage.

scholarly journals Mild Ammonia Synthesis over Ba-Promoted Ru/MPC Catalysts: Effects of the Ba/Ru Ratio and the Mesoporous Structure

Catalysts ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 480 ◽  
Author(s):  
Masayasu Nishi ◽  
Shih-Yuan Chen ◽  
Hideyuki Takagi
Keyword(s):  
Synergistic Effect ◽  
Mesoporous Carbon ◽  
Active Sites ◽  
Molecular Diffusion ◽  
Ammonia Synthesis ◽  
Mesoporous Structure ◽  
X Ray Diffraction ◽  
Carbon Framework ◽  
Catalytically Active ◽  
Ru Species

A series of novel mesoporous carbon-supported, Ba-promoted, Ru catalysts with Ba/Ru ratios of 0.1–1.6 and a Ru loading of 10 wt% (denoted as 0.1–1.6Ba-10Ru/MPC) were prepared via stepwise impregnation of Ru and Ba precursors on the mesoporous carbon materials. The catalysts were applied to mild ammonia synthesis and compared to reference materials, including an analog of the prepared catalyst with a Ba/Ru ratio of 1.6 and a Ru loading of 10 wt% (denoted as 1.6Ba-10Ru/AC). Characterization by X-ray diffraction (XRD), nitrogen physisorption, and electronic microscopy revealed that the 0.1–1.6Ba-10Ru/MPC catalysts contained Ru particles (approximately 2 nm) that were well-dispersed on the mesoporous structure and nanostructured Ba(NO3)2 species. These species decomposed into amorphous BaOx species, acting as a promoter on the metallic Ru particles forming catalytically active sites for ammonia synthesis. All the 0.1–1.6Ba-10Ru/MPC catalysts showed a synergistic effect of the active Ba and Ru species, which were stabilized in the mesoporous carbon framework with fast molecular diffusion and could effectively catalyze mild ammonia synthesis (280–450 °C and 0.99 MPa) even under intermittently variable conditions, particularly for those with Ba/Ru ratios of >0.5. In contrast, the 1.6Ba-10Ru/AC analog showed poor activity and stability for ammonia synthesis due to the sintering of Ba and Ru particles on the outer surface of the microporous carbon framework, resulting in low molecular diffusion and weak synergistic effect of the catalytically active sites.

scholarly journals High Capacity and Fast Kinetics of Potassium-Ion Batteries Boosted by Nitrogen-Doped Mesoporous Carbon Spheres

2021 ◽  
Vol 13 (1) ◽  
Author(s):  
Jiefeng Zheng ◽  
Yuanji Wu ◽  
Yong Tong ◽  
Xi Liu ◽  
Yingjuan Sun ◽  
...  
Keyword(s):  
Mesoporous Carbon ◽  
Active Sites ◽  
Carbon Materials ◽  
Potassium Ion ◽  
High Rate ◽  
Electrochemical Performances ◽  
Carbon Spheres ◽  
Fast Kinetics ◽  
Nitrogen Doped ◽  
Economic Price

AbstractIn view of rich potassium resources and their working potential, potassium-ion batteries (PIBs) are deemed as next generation rechargeable batteries. Owing to carbon materials with the preponderance of durability and economic price, they are widely employed in PIBs anode materials. Currently, porosity design and heteroatom doping as efficacious improvement strategies have been applied to the structural design of carbon materials to improve their electrochemical performances. Herein, nitrogen-doped mesoporous carbon spheres (MCS) are synthesized by a facile hard template method. The MCS demonstrate larger interlayer spacing in a short range, high specific surface area, abundant mesoporous structures and active sites, enhancing K-ion migration and diffusion. Furthermore, we screen out the pyrolysis temperature of 900 °C and the pore diameter of 7 nm as optimized conditions for MCS to improve performances. In detail, the optimized MCS-7-900 electrode achieves high rate capacity (107.9 mAh g−1 at 5000 mA g−1) and stably brings about 3600 cycles at 1000 mA g−1. According to electrochemical kinetic analysis, the capacitive-controlled effects play dominant roles in total storage mechanism. Additionally, the full-cell equipped MCS-7-900 as anode is successfully constructed to evaluate the practicality of MCS.

Embedding MnO@Mn3O4Nanoparticles in an N-Doped-Carbon Framework Derived from Mn-Organic Clusters for Efficient Lithium Storage

2017 ◽  
Vol 30 (6) ◽  
pp. 1704244 ◽  
Author(s):  
Yanting Chu ◽  
Lingyu Guo ◽  
Baojuan Xi ◽  
Zhenyu Feng ◽  
Fangfang Wu ◽  
...  
Keyword(s):  
Lithium Storage ◽  
Carbon Framework

T-Nb2O5 nanoparticles confined in carbon nanotubes with fast ion diffusion rate for lithium storage

2021 ◽  
Author(s):  
Yang Zhang ◽  
Yakun Tang ◽  
Lang Liu ◽  
Yue Zhang ◽  
Zhiguo Li
Keyword(s):  
Carbon Nanotubes ◽  
Active Sites ◽  
Diffusion Rate ◽  
Conductive Network ◽  
Ion Diffusion ◽  
Lithium Storage ◽  
Transmission Path ◽  
Fast Ion

T-Nb2O5/CNT nanohybrid with short transmission path, rich active sites, and favorable mechanical flexibility can achieve the fast transportation of ions/electrons. The obtained nanohybrid with continuous conductive network exhibit better lithium...

Supporting Cu@In2O3 Core-Shell Structure on N-Doped Graphitic Carbon Cuboctahedra Cages for Efficient Photocatalytic Homo-Coupling of Terminal Alkynes

2021 ◽  
Author(s):  
Yaya Yuan ◽  
Yaqun Wang ◽  
Gui-lin Zhuang ◽  
Fenglei Yang ◽  
Qiu-Yan Li ◽  
...  
Keyword(s):  
Shell Structure ◽  
Active Sites ◽  
Separation Efficiency ◽  
Graphitic Carbon ◽  
Special Structure ◽  
Core Shell ◽  
Terminal Alkynes ◽  
Photocatalytic Efficiency ◽  
Core Shell Structure

Improving the separation efficiency of photogenerated carriers and exposing more active sites are two important factors to improve photocatalytic efficiency of photocatalyst. Designing appropriate materials with special structure and composition...

In-situ encapsulation of pseudocapacitive Li2TiSiO5 nanoparticles into fibrous carbon framework for ultrafast and stable lithium storage

Nano Energy ◽  
2019 ◽  
Vol 55 ◽  
pp. 173-181 ◽  
Author(s):  
Shijie Wang ◽  
Rutao Wang ◽  
Ye Bian ◽  
Dongdong Jin ◽  
Yabin Zhang ◽  
...  
Keyword(s):  
Lithium Storage ◽  
Carbon Framework ◽  
Fibrous Carbon
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