The micropore structure of disordered carbons determined by high resolution electron microscopy

Fryer, J. R.

doi:10.1016/0008-6223(81)90026-9

Cited by 77 publications

(30 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This structure has already been suggested by high resolution electron microscopy 14 and by the dark-field technique of Oberlin et al [15][16][17] As discussed recently, 4 …”

Section: Determination Of the Specific Surface Area Of Carbon Materialsmentioning

confidence: 86%

Optimization of the characterization of porous carbons for supercapacitors

Stoeckli

Centeno

2013

J. Mater. Chem. A

View full text Add to dashboard Cite

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 -2 ) 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 approaches, (i) the effective surface area accessible to the ions, which may differ considerably from the BET-surface and (ii) the volumetric capacitance in the micropores. One obtains 0.094 F m -2 for (C 2 H 5 ) 4 NBF 4 /acetonitrile and approximately 0.100 F m -2 in aqueous H 2 SO 4 after correcting for pseudo-capacitance effects. This pattern is supported by recent modelling which takes into account the solvent. It is also suggested that constant values of the surface based-capacitance may reflect a gradual decrease of the dielectric constant of the electrolytes in smaller micropores due to desolvation.

show abstract

“…This structure has already been suggested by high resolution electron microscopy 14 and by the dark-field technique of Oberlin et al [15][16][17] As discussed recently, 4 …”

Section: Determination Of the Specific Surface Area Of Carbon Materialsmentioning

confidence: 86%

Optimization of the characterization of porous carbons for supercapacitors

Stoeckli

Centeno

2013

J. Mater. Chem. A

View full text Add to dashboard Cite

show abstract

“…Fryer (1981) examined a variety of porous carbons in loo-, 120-, and 500-KeV TEMs, but did not observe any advantage of the higher voltages for revealing the porous structure in the cokes. It seems possible that in this case the greater resolution available in the 500-KeV instrument contributed greater detail which made the image more confusing, and less easily interpreted.…”

Section: Coke Depositsmentioning

confidence: 93%

Transmission electron microscopy of catalysts

Sanders

1986

J. Elec. Microsc. Tech.

View full text Add to dashboard Cite

The determination of the structures of catalysts is an important step in understanding their behaviour and in developing new or improved catalysts. By their nature, catalysts mostly have a structure which can be resolved only by transmission electron microscopy (TEM) used near its limit of applicability. This article discusses recent selected examples of the use of TEM to examine materials used as catalysts, such as clusters of atoms, small crystalline particles, the materials (oxides) on which these are supported, zeolites, and deposits of carbon which often form on catalysts during catalytic reactions. Interpretation of the images is often aided by the techniques of image processing.

show abstract

“…Since planes of carbon atoms can curl but still appear as fringes when viewed edge-on, rigorous interpretation of two-dimensional images must be done with great caution. Fryer (1981) examined the micropore structure of turbostratic carbons as a function of accelerating potential of the TEM. Historically, interlayer measurements have been made, since the early 1960's, by X-ray powder diffraction spectrometry.…”

Section: Alternative Methods For Quantificationmentioning

confidence: 99%