Structural property of boron-doped double-walled carbon nanotubes

Lyu, S.C.; Ahn, KiTae; Han, Jung-Geun; Shin, Kwonwoo; Sok, Junghyun

doi:10.1109/nano.2010.5697934

Cited by 2 publications

(1 citation statement)

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“…In other words, the shifts of the G band to the higher frequency is considered to be caused by the deformation of the graphitic structure with an increasing boron concentration. 32,33 As seen in Fig. 4, when either 1.5g, 3g, 5g or 8g of LiBO2 has been added to electrolyte prior to the electrosynthesis, subsequent to the synthesis the G band of the product shifts to 1583, 1587, 1589, 1600 cm -1 , respectively.…”

Section: Resultsmentioning

confidence: 95%

Transformation of the greenhouse gas CO2 by molten electrolysis into a wide controlled selection of carbon nanotubes

Ren

Johnson

Singhal

et al. 2017

Journal of CO2 Utilization

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This paper demonstrates a highly favored route for the synthesis of controlled nanostructures at high rate, high yield, and low cost by molten carbonate electrolysis splitting of CO2. We show the wide, portfolio of carbon nanotubes (CNTs) that can be produced by controlling the electrolysis conditions in this one-pot synthesis. For example solid core carbon nanofibers are formed with C-13 isotope CO2, whereas hollow core CNTs are formed with natural abundance CO2 (which contains 99% C-12 and 1% C-13). Shown are the first doped electrosynthesized carbon nanotubes, prepared with added electrolytic LiBO2 for boron doping, and salts for phosphorous, nitrogen or sulfur CNT doping are probed. Boron doping greatly enhances conductivity of the CNTs. Electrolytic CaCO3 produces thin-walled CNTs, while excess electrolytic oxide yields tangled CNTs. Addition of up to 50 mol% Na2CO3 to a Li2CO3 electrolyte, decreases electrolyte costs and improves conditions for intercalation in Na-ion CNT anodes. Addition of BaCO3 increases electrolyte density. Longer electrolysis time leads to proportionally wider diameter CNTs. Synthetic components (steel cathode, nickel anode and inorganic carbonate electrolyte) are available and inexpensive. Advantages include (1) production is limited only by the cost of electrons (electricity) providing a substantial cost reduction compared to conventional CVD and polymer spinning syntheses and (2) the only reactant consumed in the formation of the CNTs is CO2, transforming this greenhouse gas into a stable, valuable product and providing an economic incentive to the removal of anthropogenic CO2 from flue gas or from the atmosphere.

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Section: Resultsmentioning

confidence: 95%