Silica-Assisted Assembly for Synthesis of Nitrogen-Doped Hollow Mesoporous Carbon Spheres as Supercapacitors

2017 ◽  
Vol 164 (9) ◽  
pp. A1918-A1923 ◽  
Author(s):  
Yuying Wang ◽  
Juan Du ◽  
Hongliang Zhang ◽  
Lei Liu ◽  
Yifeng Yu ◽  
...  
2021 ◽  
Vol 13 (1) ◽  
Author(s):  
Jiefeng Zheng ◽  
Yuanji Wu ◽  
Yong Tong ◽  
Xi Liu ◽  
Yingjuan Sun ◽  
...  

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.


Carbon ◽  
2018 ◽  
Vol 127 ◽  
pp. 85-92 ◽  
Author(s):  
Jian-Gan Wang ◽  
Hongzhen Liu ◽  
Huanhuan Sun ◽  
Wei Hua ◽  
Huwei Wang ◽  
...  

2017 ◽  
Vol 393 ◽  
pp. 151-158 ◽  
Author(s):  
Aibing Chen ◽  
Yunqian Li ◽  
Lei Liu ◽  
Yifeng Yu ◽  
Kechan Xia ◽  
...  

NANO ◽  
2015 ◽  
Vol 10 (05) ◽  
pp. 1550076 ◽  
Author(s):  
Tianjiao Bi ◽  
Jiafeng Wan ◽  
Shilin Yang ◽  
Xiujuan Yu ◽  
Fangwei Ma

Nitrogen-doped mesoporous carbon spheres (NMCSs) supporting anatase TiO 2 ( NMCSs – TiO 2) were prepared by a simple two-step solvothermal approach. The characterizations for the physicochemical properties of prepared samples under different solvothermal temperatures were carried out by X-ray diffraction (XRD) analyses, scanning electron microscopy (SEM), transmission electron microscopy (TEM), N 2 adsorption–desorption (Brunauer–Emmett–Teller (BET) measurements), Fourier transform infrared (FT-IR) spectroscopy, Raman scattering and UV-Vis diffuse reflectance spectra, were combined in order to determine the crystal phase and grain size, shape, degree of mesoporous carbon incorporation, and nature of the resultant oxycarbide chemical bonding on the surface and in the bulk. The high relative photocatalytic activity of NMCSs – TiO 2 nanoparticle was evaluated through a study of the decomposition of phenol under visible-light excitation.


Sign in / Sign up

Export Citation Format

Share Document