Fluorescent pyrene-centered starburst oligocarbazoles with excellent thermal and electrochemical stabilities

2011 ◽  
Vol 9 (20) ◽  
pp. 6913 ◽  
Author(s):  
Ming-Guang Ren ◽  
Hui-Jun Guo ◽  
Fei Qi ◽  
Qin-Hua Song
Keyword(s):  
Electrochemical Stabilities

scholarly journals Ionic liquid based EDLCs: influence of carbon porosity on electrochemical performance

2014 ◽  
Vol 172 ◽  
pp. 163-177 ◽  
Author(s):  
Asa Noofeli ◽  
Peter J. Hall ◽  
Anthony J. R. Rennie
Keyword(s):  
Electrochemical Performance ◽  
Pore Size ◽  
Electrochemical Impedance ◽  
Constant Current ◽  
Peak Performance ◽  
Promising Alternative ◽  
Electrochemical Stabilities ◽  
Electrochemical Double Layer ◽  
Improved Performance ◽  
Operating Potential

Electrochemical double layer capacitors (EDLCs) are a category of supercapacitors; devices that store charge at the interface between electrodes and an electrolyte. Currently available commercial devices have a limited operating potential that restricts their energy and power densities. Ionic liquids (ILs) are a promising alternative electrolyte as they generally exhibit greater electrochemical stabilities and lower volatility. This work investigates the electrochemical performance of EDLCs using ILs that combine the bis(trifluoromethanesulfonyl)imide anion with sulfonium and ammonium based cations. Different activated carbon materials were employed to also investigate the influence of varying pore size on electrochemical performance. Electrochemical impedance spectroscopy (EIS) and constant current cycling at different rates were used to assess resistance and specific capacitance. In general, greater specific capacitances and lower resistances were found with the sulfonium based ILs studied, and this was attributed to their smaller cation volume. Comparing electrochemical stabilities indicated that significantly higher operating potentials are possible with the ammonium based ILs. The marginally smaller sulfonium cation performed better with the carbon exhibiting the largest pore width, whereas peak performance of the larger sulfonium cation was associated with a narrower pore size. Considerable differences between the performance of the ammonium based ILs were observed and attributed to differences not only in cation size but also due to the inclusion of a methoxyethyl group. The improved performance of the ether bond containing IL was ascribed to electron donation from the oxygen atom influencing the charge density of the cation and facilitating cation–cation interactions.

scholarly journals Physicochemical and Electronic Properties of Cationic [6]Helicenes: from Chemical and Electrochemical Stabilities to Far-Red (Polarized) Luminescence

2016 ◽  
Vol 22 (51) ◽  
pp. 18273-18273
Author(s):  
Johann Bosson ◽  
Geraldine M. Labrador ◽  
Simon Pascal ◽  
François-Alexandre Miannay ◽  
Oleksandr Yushchenko ◽  
...  
Keyword(s):  
Electronic Properties ◽  
Electrochemical Stabilities ◽  
Polarized Luminescence

Surface Structures and Electrochemical Stabilities for Pt/Pd(111) Model Electrocatalysts

2016 ◽  
Vol 75 (14) ◽  
pp. 741-746
Author(s):  
N. Todoroki ◽  
Y. Bando ◽  
Y. Tani ◽  
S. Kaneko ◽  
H. Watanabe ◽  
...  
Keyword(s):  
Surface Structures ◽  
Electrochemical Stabilities

A comparison of the electrochemical stabilities of metal, polymer and graphite coated nanospray emitters

The Analyst ◽  
2003 ◽  
Vol 128 (6) ◽  
pp. 728 ◽  
Author(s):  
Magnus Wetterhall ◽  
Oliver Klett ◽  
Karin E. Markides ◽  
Leif Nyholm ◽  
Jonas Bergquist
Keyword(s):  
Electrochemical Stabilities ◽  
Metal Polymer
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