An efficient, bifunctional catalyst for lithium–oxygen batteries obtained through tuning the exterior Co2+/Co3+ ratio of CoOx on N-doped carbon nanofibers

2019 ◽  
Vol 9 (8) ◽  
pp. 1998-2007 ◽  
Author(s):  
Xiuling Zhang ◽  
Wei Fan ◽  
Shuyu Zhao ◽  
Ran Cao ◽  
Congju Li
Keyword(s):  
Electrochemical Performance ◽  
Carbon Nanofibers ◽  
Bifunctional Catalyst ◽  
Electrospinning Technique ◽  
The Rich ◽  
Lithium Oxygen Batteries ◽  
Enhanced Electrochemical Performance

CoOx NPs@N-doped carbon nanofibers were obtained by an electrospinning technique and served as an excellent catalyst for Li–O2 cells. The enhanced electrochemical performance can be ascribed to the rich Co2+ toward the ORR and OER on the surface of CoOx.

Reduced free-standing Co3O4@Ni cathode for lithium–oxygen batteries with enhanced electrochemical performance

RSC Advances ◽  
2016 ◽  
Vol 6 (20) ◽  
pp. 16263-16267 ◽  
Author(s):  
Chen Shen ◽  
Zhaoyin Wen ◽  
Fan Wang ◽  
Xiao Huang ◽  
Kun Rui ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Electrochemical Activity ◽  
Partial Reduction ◽  
Free Standing ◽  
Lithium Oxygen Battery ◽  
Lithium Oxygen Batteries ◽  
Enhanced Electrochemical Performance

The electrochemical activity of Co3O4 in lithium–oxygen battery is significantly improved by partial reduction of Co3+ to Co2+.

scholarly journals Synthesis and characterization of electrospun molybdenum dioxide–carbon nanofibers as sulfur matrix additives for rechargeable lithium–sulfur battery applications

2018 ◽  
Vol 9 ◽  
pp. 262-270 ◽  
Author(s):  
Ruiyuan Zhuang ◽  
Shanshan Yao ◽  
Maoxiang Jing ◽  
Xiangqian Shen ◽  
Jun Xiang ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Heat Treatment ◽  
Electrochemical Performance ◽  
Carbon Nanofibers ◽  
Lithium Ion ◽  
Cycle Performance ◽  
Bet Surface Area ◽  
Molybdenum Dioxide ◽  
Electrospinning Technique ◽  
Lithium Sulfur

One-dimensional molybdenum dioxide–carbon nanofibers (MoO2–CNFs) were prepared using an electrospinning technique followed by calcination, using sol–gel precursors and polyacrylonitrile (PAN) as a processing aid. The resulting samples were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, Brunauer–Emmet–Teller (BET) surface area measurements, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). MoO2–CNFs with an average diameter of 425–575 nm obtained after heat treatment were used as a matrix to prepare sulfur/MoO2–CNF cathodes for lithium–sulfur (Li–S) batteries. The polysulfide adsorption and electrochemical performance tests demonstrated that MoO2–CNFs did not only act as polysulfide reservoirs to alleviate the shuttle effect, but also improve the electrochemical reaction kinetics during the charge–discharge processes. The effect of MoO2–CNF heat treatment on the cycle performance of sulfur/MoO2–CNFs electrodes was examined, and the data showed that MoO2–CNFs calcined at 850 °C delivered optimal performance with an initial capacity of 1095 mAh g−1 and 860 mAh g−1 after 50 cycles. The results demonstrated that sulfur/MoO2–CNF composites display a remarkably high lithium–ion diffusion coefficient, low interfacial resistance and much better electrochemical performance than pristine sulfur cathodes.

Enhanced electrochemical performance of phosphorus incorporated carbon nanofibers by the spin-on dopant method

RSC Advances ◽  
2016 ◽  
Vol 6 (63) ◽  
pp. 58823-58830 ◽  
Author(s):  
Dong-Yo Sin ◽  
Il-Kyu Park ◽  
Hyo-Jin Ahn
Keyword(s):  
Electrochemical Performance ◽  
Carbon Nanofibers ◽  
Electrochemical Capacitors ◽  
Enhanced Electrochemical Performance

Phosphorus-incorporated carbon nanofibers (CNFs) were successfully fabricated by using electrospinning and spin-on dopant (SOD) procedures together for electrochemical capacitors (ECs).

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