My watch list  

Low‐Temperature Molten‐Salt Production of Silicon Nanowires by the Electrochemical Reduction of CaSiO3


Silicon is an extremely important technological material, but its current industrial production by the carbothermic reduction of SiO2 is energy intensive and generates CO2 emissions. Herein, we developed a more sustainable method to produce silicon nanowires (Si NWs) in bulk quantities through the direct electrochemical reduction of CaSiO3, an abundant and inexpensive Si source soluble in molten salts, at a low temperature of 650 °C by using low‐melting‐point ternary molten salts CaCl2–MgCl2–NaCl, which still retains high CaSiO3 solubility, and a supporting electrolyte of CaO, which facilitates the transport of O2− anions, drastically improves the reaction kinetics, and enables the electrolysis at low temperatures. The Si nanowire product can be used as high‐capacity Li‐ion battery anode materials with excellent cycling performance. This environmentally friendly strategy for the practical production of Si at lower temperatures can be applied to other molten salt systems and is also promising for waste glass and coal ash recycling.

Altglas zu Batterien: Eine neue Methode zur Produktion von Silicium‐Nanodrähten basiert auf der direkten elektrochemischen Reduktion von CaSiO3 bei 650 °C. Die Methode verwendet niedrig schmelzende ternäre Salze CaCl2‐MgCl2‐NaCl, die eine hohe Löslichkeit für CaSiO3 aufweisen, sowie einen Hilfselektrolyten, CaO, der die Reaktionskinetik verbessert und die Elektrolyse bei vergleichsweise niedrigen Temperaturen ermöglicht.

Authors:   Yifan Dong, Tylor Slade, Matthew J Stolt, Linsen Li, Steven N Girard, Liqiang Mai, Song Jin; Yifan Dong, Tyler Slade, Matthew J. Stolt, Linsen Li, Steven N. Girard, Liqiang Mai, Song Jin
Journal:   Angewandte Chemie
Volume:   129
edition:   46
Year:   2017
Pages:   14645
DOI:   10.1002/ange.201707064
Publication date:   18-Oct-2017
More about Angewandte Chemie
  • News

    Spectroscopically Controlled Quantum Bits

    Molecules could make useful systems for quantum computers, but they must contain individually addressable, interacting quantum bit centers. In the journal Angewandte Chemie, a team of researchers has now presented a molecular model with three different, coupled qubit centers. As each center ... more

    Fuel from a Greenhouse Gas

    One step toward carbon dioxide (CO2) neutrality and the mitigation of both the greenhouse effect and the energy crisis would be to convert CO2 into hydrocarbon-based fuels like methane using light. In the journal Angewandte Chemie, a Chinese research team has introduced a highly effective p ... more

    Economical PEF Production

    One possible replacement for drink containers made from PET is polyethylene furandicarboxylate (PEF), made from renewable resources. However, the production of the raw material for PEF from biomass is still rather inefficient. A new titanium-based photocatalyst could be about to change this ... more

More about Wiley
Your browser is not current. Microsoft Internet Explorer 6.0 does not support some functions on Chemie.DE