carbon nanospheres
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Author(s):  
Fei Zhang ◽  
Ping Liu ◽  
Yue Tian ◽  
Jinfeng Wu ◽  
Xuewei Wang ◽  
...  

Uncontrollable Li dendrite growth increases the risks of cell short-circuit or even safety accidents, severely hindering the practical application of lithium metal anodes (LMAs). Herein, the N/S-co-doped mesoporous carbon nanospheres...


2021 ◽  
Vol 8 ◽  
Author(s):  
Jiaqian Li ◽  
Yaru Yang ◽  
Yunchao Xiao ◽  
Bolin Tang ◽  
Yaming Ji ◽  
...  

To improve the flame retardant properties of polyethylene terephthalate (PET), glucose-derived carbon nanospheres (CNSs) were synthesized and introduced into PET matrix. The thermal property and flame retardancy of CNSs/PET composites were thoroughly investigated. Results showed that CNSs displayed good flame-retardant performance for PET. When blended with only 1.0 wt.% of CNSs, CNSs/PET exhibited a limiting oxygen index (LOI) of 26.3 and a vertical combustion class of V-2, and its peak-heat release rate (pk-HRR) was reduced by 41.6%. Importantly, the initial decomposition temperature and the maximum weight loss temperature of CNSs/PET were 52°C and 199°C higher than those of PET, respectively. Furthermore, a condensed phase flame-retardant mechanism appeared in CNSs/PET, which formed a dense and thermally stable protective char layer during combustion. Overall, this study disclosed the flame-retardant potential and possible mechanism of CNSs for polyesters, which would benefit the development of carbon-based materials and flame-retardant polymers.


Materials ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 7716
Author(s):  
Teresa Briz-Amate ◽  
Jesica Castelo-Quibén ◽  
Esther Bailón-García ◽  
Abdalla Abdelwahab ◽  
Francisco Carrasco-Marín ◽  
...  

This work shows the preparation of carbon nanospheres with a high superficial nitrogen content (7 wt.%), obtained by a simple hydrothermal method, from pyrocatechol and formaldehyde, around which tungsten nanophases have been formed. One of these nanophases is tungsten carbide, whose electro-catalytic behavior in the ORR has been evaluated together with the presence of nitrogen surface groups. Both current and potential kinetic density values improve considerably with the presence of tungsten, despite the significant nitrogen loss detected during the carbonization treatment. However, the synergetic effect that the WC has with other electro-catalytic metals in this reaction cannot be easily evaluated with the nitrogen in these materials, since both contents vary in opposite ways. Nevertheless, all the prepared materials carried out oxygen electro-reduction by a mixed pathway of two and four electrons, showing remarkable electro-catalytic behavior.


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