Two-dimensional silicon-29 NMR studies of aqueous silicate solutions

Harris, Robin K.; O'connor, M. J.; Curzon, Eirian H.; Howarth, Oliver W.

doi:10.1016/0022-2364(84)90239-7

Cited by 23 publications

(26 citation statements)

References 4 publications

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“…Up to 4M Si content in the electrolyte, nevertheless, the discharge profiles were not affected considerably; above this limit, viscous solutions were obtained. The corrosion reaction products were also analyzed by means of in-situ 29 Si nuclear magnetic resonance (NMR) and formations of the silicates were identified by following the studies of Engelhardt et al [158,159] and Harris et al [160,161,162].…”

Section: Silicon-air Batteriesmentioning

confidence: 99%

Silicon and Iron as Resource-Efficient Anode Materials for Ambient-Temperature Metal-Air Batteries: A Review

et al. 2019

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Metal-air batteries provide a most promising battery technology given their outstanding potential energy densities, which are desirable for both stationary and mobile applications in a “beyond lithium-ion” battery market. Silicon- and iron-air batteries underwent less research and development compared to lithium- and zinc-air batteries. Nevertheless, in the recent past, the two also-ran battery systems made considerable progress and attracted rising research interest due to the excellent resource-efficiency of silicon and iron. Silicon and iron are among the top five of the most abundant elements in the Earth’s crust, which ensures almost infinite material supply of the anode materials, even for large scale applications. Furthermore, primary silicon-air batteries are set to provide one of the highest energy densities among all types of batteries, while iron-air batteries are frequently considered as a highly rechargeable system with decent performance characteristics. Considering fundamental aspects for the anode materials, i.e., the metal electrodes, in this review we will first outline the challenges, which explicitly apply to silicon- and iron-air batteries and prevented them from a broad implementation so far. Afterwards, we provide an extensive literature survey regarding state-of-the-art experimental approaches, which are set to resolve the aforementioned challenges and might enable the introduction of silicon- and iron-air batteries into the battery market in the future.

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Section: Silicon-air Batteriesmentioning

confidence: 99%

Silicon and Iron as Resource-Efficient Anode Materials for Ambient-Temperature Metal-Air Batteries: A Review

et al. 2019

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“…PANACEA. [17] Some of the coupling values in the silicates were determined by groups of Harris, [18,19] Knight [18,20] and Marsmann [21] but until recently only very few values of 2 J( 29 Si-O- 29 Si) values were reported [3,22,23] for oligosiloxanes despite that 29 Si NMR has proved to be the most powerful method for the analysis of these industrially important compounds with global annual production in 2002 estimated at 850 thousand metric tons. [24] The very first representative set of values was reported in our preliminary communication on these couplings in oligomethylsiloxanes [25] ; their signs, to the best of our knowledge, have not yet been determined.…”

Section: Silicon-silicon J(mentioning

confidence: 99%

Geminal²J(²⁹Si‐O‐²⁹Si) couplings in oligosiloxanes and their relation to direct¹J(²⁹Si‐¹³C) couplings

Kurfürst¹,

Blechta²,

Schraml³

2011

Magnetic Reson in Chemistry

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Absolute values of (79) geminal (2)J((29) Si-O-(29)Si) couplings were measured in an extensive series of (55) unstrained siloxanes dissolved in chloroform-d. Signs of (2)J((29)Si-O-(29)Si) in some (9) silicon hydrides were determined relative to (1)J((29)Si-(1)H) which are known to be negative. It is supposed that positive sign of the (2)J((29)Si-O-(29)Si) coupling found in all studied hydrides is common to all siloxanes. Theoretical calculations for simple model compounds failed to reproduce this sign and so their predictions of bond length and angle dependences cannot be taken as reliable. Useful empirical correlations were found between the (2)J((29)Si-O-(29)Si) couplings on one side and the total number m of oxygen atoms bonded to the silicon atoms, sum of (29)Si chemical shifts or product of (1)J((29)Si-(13)C) couplings on the other side. The significance of these correlations is briefly discussed.

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“…vs. Na ? ) on the mechanical strength of the composites containing alkali silicates [8,16] have demonstrated a higher mechanical strength of potassium silicate-based materials versus those based on sodium silicate. However, these studies lack analysis and discussions of the hydrolytic stability and porosity of these binders, which are critical for their industrial application.…”

Section: Introductionmentioning

confidence: 99%

Alkali silicate binders: effect of SiO2/Na2O ratio and alkali metal ion type on the structure and mechanical properties

Skorina

Тихомирова

2012

J Mater Sci

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The influence of SiO 2 :Na 2 O molar ratio and the nature of an alkali metal (Na vs. K) in commercial aqueous alkali silicate on the microstructure, textural properties, phase composition, and hydrolytic stability of an alkali silicate binder have been investigated using scanning electron microscopy, nitrogen adsorption/desorption technique, X-ray diffractometry, thermal analysis, and dissolution tests. It has been found that microstructure and textural properties of the alkali silicate binder depend both on silica to alkali molar ratio and type of alkali metal (Na vs. K). Sodium silicate binder obtained from commercial silicate solution with lower SiO 2 :Na 2 O molar ratio (2.2) exhibits a globular microstructure of silica xerogel with high content of micropores, whereas the binder formulated with SiO 2 :Na 2 O molar ratio 3.2 is characterized by more open cluster structure with lower content of micropores. It is observed that surface specific area estimated by Brunauer, Emmett, and Teller method and mesopore volume obtained by the Barrett-Joyner-Halenda method for sodium silicate binder are substantially higher than those for potassium silicate binder. The ultimate hydrolytic stability of the sodium silicate binder increases slightly with increase in the silica to alkali molar ratio within the studied range. Decreasing in SiO 2 :Na 2 O molar ratio and replacement of sodium silicate solution by potassium silicate solution in the corresponding filled composition lead to the improvement of mechanical properties and decrease in open porosity.

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Two-dimensional silicon-29 NMR studies of aqueous silicate solutions

Cited by 23 publications

References 4 publications

Silicon and Iron as Resource-Efficient Anode Materials for Ambient-Temperature Metal-Air Batteries: A Review

Silicon and Iron as Resource-Efficient Anode Materials for Ambient-Temperature Metal-Air Batteries: A Review

Geminal²J(²⁹Si‐O‐²⁹Si) couplings in oligosiloxanes and their relation to direct¹J(²⁹Si‐¹³C) couplings

Alkali silicate binders: effect of SiO2/Na2O ratio and alkali metal ion type on the structure and mechanical properties

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Two-dimensional silicon-29 NMR studies of aqueous silicate solutions

Cited by 23 publications

References 4 publications

Silicon and Iron as Resource-Efficient Anode Materials for Ambient-Temperature Metal-Air Batteries: A Review

Silicon and Iron as Resource-Efficient Anode Materials for Ambient-Temperature Metal-Air Batteries: A Review

Geminal2J(29Si‐O‐29Si) couplings in oligosiloxanes and their relation to direct1J(29Si‐13C) couplings

Alkali silicate binders: effect of SiO2/Na2O ratio and alkali metal ion type on the structure and mechanical properties

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Geminal²J(²⁹Si‐O‐²⁹Si) couplings in oligosiloxanes and their relation to direct¹J(²⁹Si‐¹³C) couplings