Radial distribution function analysis of the structure of activated carbons

Burian, A.; Ratuszna, A.; Dore, John C.

doi:10.1016/s0008-6223(98)00131-6

Cited by 57 publications

(61 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…23 Na is a favourable nucleus for study by NMR owing to its 100% natural abundance and high sensitivity. Like 11 B, it has a nuclear spin I = 3/2 meaning that it is subject to quadrupolar interactions in non-symmetric environments.…”

Section: Hmentioning

confidence: 99%

Solid-state NMR studies of supercapacitors

Griffin

Forse

Grey

2016

Solid State Nuclear Magnetic Resonance

View full text Add to dashboard Cite

Electrochemical double-layer capacitors, or 'supercapacitors' are attracting increasing attention as high-power energy storage devices for a wide range of technological applications. These devices store charge through electrostatic interactions between liquid electrolyte ions and the surfaces of porous carbon electrodes. However, many aspects of the fundamental mechanism of supercapacitance are still not well understood, and there is a lack of experimental techniques which are capable of studying working devices. Recently, solid-state NMR has emerged as a powerful tool for studying the local environments and behaviour of electrolyte ions in supercapacitor electrodes. In this Trends article, we review these recent developments and applications. We first discuss the basic principles underlying the mechanism of supercapacitance, as well as the key NMR observables that are relevant to the study of supercapacitor electrodes.We then review some practical aspects of the study of working devices using ex situ and in situ methodologies and explain the key advances that these techniques have allowed on the study of supercapacitor charging mechanisms. NMR experiments have revealed that the pores of the carbon electrodes contain a significant number of electrolyte ions in the absence of any charging potential. This has important implications for the molecular mechanisms of supercapacitance, as charge can be stored by different ion adsorption/desorption processes. Crucially, we show how in situ NMR experiments can be used to quantitatively study and characterise the charging mechanism, with the experiments providing the most detailed picture of charge storage to date, offering the opportunity to design enhanced devices. Finally, an outlook for future directions for solid-state NMR in supercapacitor research is offered.3

show abstract

Section: Hmentioning

confidence: 99%

Solid-state NMR studies of supercapacitors

Griffin

Forse

Grey

2016

Solid State Nuclear Magnetic Resonance

View full text Add to dashboard Cite

show abstract

“…[40][41][42][43][44]. However, the interpretation of diffraction data from these highly disordered materials is not straightforward.…”

Section: Evidence For Fullerene-like Structures In Microporous Carbonsmentioning

confidence: 99%

“…More recent neutron diffraction studies have suggested that non-graphitizing carbons consist entirely of sp 2 atoms. 40 It is less clear whether diffraction methods can establish whether the atoms are bonded in pentagonal or hexagonal rings. Both Petkov et al 42 and Zetterstrom and colleagues 43 have interpreted neutron diffraction data from nanoporous carbons in terms of a structure containing non-hexagonal rings, but other interpretations may also be possible.…”

Section: Evidence For Fullerene-like Structures In Microporous Carbonsmentioning

confidence: 99%

New Perspectives on the Structure of Graphitic Carbons

Harris

2005

Critical Reviews in Solid State and Materials Sciences

366

251

View full text Add to dashboard Cite

Graphitic forms of carbon are important in a wide variety of applications, ranging from pollution control to composite materials, yet the structure of these carbons at the molecular level is poorly understood. The discovery of fullerenes and fullerene-related structures such as carbon nanotubes has given a new perspective on the structure of solid carbon. This review aims to show how the new knowledge gained as a result of research on fullerene-related carbons can be applied to well-known forms of carbon such as microporous carbon, glassy carbon, carbon fibers, and carbon black.

show abstract

“…The first is the shoulder on the first peak at around 1.8 Å, whilst the second is a distinct but small peak at 3.3 Å. A number of other groups report similar features for carbon materials, including activated carbons [65,83,84], non-graphitizing carbons [13,65] and even coals [85]. Interestingly, the first of these features is absent from the C0 carbon but develops during activation.…”

Section: Xrd Analysismentioning

confidence: 83%