2013
DOI: 10.1039/c3cc00101f
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Facile synthesis of freestanding Si nanowire arrays by one-step template-free electro-deoxidation of SiO2 in a molten salt

Abstract: This communication presents a novel kind of silicon nanomaterial: freestanding Si nanowire arrays (Si NWAs), which are synthesized facilely by one-step template-free electro-deoxidation of SiO 2 in molten CaCl 2 . The self-assembling growth process of this material is also investigated preliminarily.

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Cited by 52 publications
(41 citation statements)
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“…[3] To avoid the harsh temperature and carbon emissions,d irect molten-salt electrolysis of silicon dioxide and silicon halides has been proposed for the preparation of Si products,s uch as Si nanopowders,S in anowires,a nd Si films. [4][5][6][7][8][9][10][11] In particular, direct electrochemical bulk reduction of insulative SiO 2 to Si in molten CaCl 2 at 850 8 8Cw as first proposed by T. Nohira et al, [4] and the CaCl 2 -based molten-salt process has emerged as ap romising method for Si electrodeposition in recent years. [8,9] However,c ommonly,acarbon anode was used as ac onsumable anode in molten salt where the liberated oxygen ions react with the carbon electrode to generate CO and CO 2 , resulting in ad ecrease in the electrode size.A dditionally,i n the silicon-deposition process,a tl east % 0.19 kg of carbon must be used for every kg of silicon produced, implying large amounts of CO 2 generated in large-scale molten-salt silicon production.…”
Section: Introductionmentioning
confidence: 99%
“…[3] To avoid the harsh temperature and carbon emissions,d irect molten-salt electrolysis of silicon dioxide and silicon halides has been proposed for the preparation of Si products,s uch as Si nanopowders,S in anowires,a nd Si films. [4][5][6][7][8][9][10][11] In particular, direct electrochemical bulk reduction of insulative SiO 2 to Si in molten CaCl 2 at 850 8 8Cw as first proposed by T. Nohira et al, [4] and the CaCl 2 -based molten-salt process has emerged as ap romising method for Si electrodeposition in recent years. [8,9] However,c ommonly,acarbon anode was used as ac onsumable anode in molten salt where the liberated oxygen ions react with the carbon electrode to generate CO and CO 2 , resulting in ad ecrease in the electrode size.A dditionally,i n the silicon-deposition process,a tl east % 0.19 kg of carbon must be used for every kg of silicon produced, implying large amounts of CO 2 generated in large-scale molten-salt silicon production.…”
Section: Introductionmentioning
confidence: 99%
“…(b) Ellingham diagram indicating the Gibbs free energy of oxidation of reactants as a function of temperature. (c) Comparison between the thermal and electrochemical reduction of silica . Reproduced with permission from Ref.…”
Section: Preparation Of Nanostructured Simentioning
confidence: 99%
“…Unlike metallothermic reduction, electrochemical conversion ionizes oxygen in molten salt, as described in Equation (5) . In this technique, an alkaline earth chloride (often CaCl 2 ) is commonly used as the electrolyte because of its low cost and high solubility for ionized oxygen and calcium . The extraction of Si from SiO 2 occurs at voltages below the electrolysis voltage and is accompanied by the decomposition of molten salt and the generation of CO/CO 2 in graphite or the inert anode from the diffusion of ionized oxygen …”
Section: Preparation Of Nanostructured Simentioning
confidence: 99%
“…22,32,35,36,58,59 In particular, Si NWs have been successfully produced from SiO 2 powder in molten salts and the reaction mechanism of the electrodeoxidation process was proposed. 22,32,35,36,58,59 In particular, Si NWs have been successfully produced from SiO 2 powder in molten salts and the reaction mechanism of the electrodeoxidation process was proposed.…”
Section: Electrolytic Fabrication Of Sic Nwsmentioning
confidence: 99%