The volumetric capacitance of microporous carbons in organic electrolyte
نویسندگان
چکیده
The study of 26 microporous carbons with average pore widths Lo between 0.7 and 1.8 nm shows that the volume-related capacitance Cmi(F cm) in the organic electrolyte (C2H5)4NBF4/acetonitrile is an inverse function of the average micropore width Lo. This means that for a given micropore volume Wo, the gravimetric capacitance C(F g) is larger for carbons with smaller pores due to the higher surface to volume ratio. Furthermore, the increase of Cmi(F cm) in smaller pores suggests that the surface-related capacitance C(F m) should be relatively constant in slit-shaped micropores. This has important technological consequences for the design of carbon-based supercapacitors. ________________________________________________________________
منابع مشابه
EDLC performance of carbide-derived carbons in aprotic and acidic electrolytes
This study shows that carbide-derived carbons (CDCs) with average pore size distributions around 0.9 to 1 nm and effective surface areas of 1300-1400 m g provide electrochemical double layer capacitors with high performances in both aqueous (2M H2SO4) and aprotic (1M (C2H5)4NBF4) in acetonitrile) electrolytes. In the acidic electrolytic solution, the gravimetric capacitance at low current densi...
متن کاملPore size distribution and capacitance in microporous carbons.
Modelling shows that the pore size distribution of microporous carbons determined by NLDFT only hides relatively small variations of the surface-related capacitance C/S between 0.7 and 1.3 nm. This suggests again that C/S in TEABF(4)-AN is 0.09 ± 0.01 F m(-2) for our typical carbons, including carbide-based samples.
متن کاملActivated Carbon Produced from Sasol-lurgi Gasifier Pitch and Its Application as Electrodes in Supercapacitors
A pyrolysis product derived from SASOL-Lurgi gasifier pitch was activated using different proportions of KOH. The increase of the amount of KOH used for activation caused the activation degree of the carbons to increase very significantly. The activated carbons obtained using lower amounts of KOH were mainly microporous, while the amount of mesopores developed in the samples progressively incre...
متن کاملSurface-related capacitance of microporous carbons in aqueous and organic electrolytes
This paper examines the surface-related capacitance C/S of carbons with average micropore widths between 0.73 and 1.80 nm, using 1-2M H2SO4, 6M KOH and 1M (C2H5)4NBF4 in acetonitrile as electrolytes. Following corrections for pseudocapacitance effects for the aqueous electrolytes and the use of an average surface area suggested by independent techniques, different from the BET area, it appears ...
متن کاملOptimization of the characterization of porous carbons for supercapacitors
The optimization of carbon-based supercapacitors is of great technological importance for electrical energy storage. This challenge stresses the relevance of current attempts to increase the surface-related capacitance C/S (F m) of carbons. We show that for microporous carbons this property is practically constant for pore widths between 0.7 and 1.8 nm. The study is based on two independent app...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2014