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Issue 35, 2013
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Up-scalable and controllable electrolytic production of photo-responsive nanostructured silicon

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Abstract

The electrochemical reduction of solid silica has been investigated in molten CaCl2 at 900 °C for the one-step, up-scalable, controllable and affordable production of nanostructured silicon with promising photo-responsive properties. Cyclic voltammetry of the metallic cavity electrode loaded with fine silica powder was performed to elaborate the electrochemical reduction mechanism. Potentiostatic electrolysis of porous and dense silica pellets was carried out at different potentials, focusing on the influences of the electrolysis potential and the microstructure of the precursory silica on the product purity and microstructure. The findings suggest a potential range between −0.60 and −0.95 V (vs. Ag/AgCl) for the production of nanostructured silicon with high purity (>99 wt%). According to the elucidated mechanism on the electro-growth of the silicon nanostructures, optimal process parameters for the controllable preparation of high-purity silicon nanoparticles and nanowires were identified. Scaling-up the optimal electrolysis was successful at the gram-scale for the preparation of high-purity silicon nanowires which exhibited promising photo-responsive properties.

Graphical abstract: Up-scalable and controllable electrolytic production of photo-responsive nanostructured silicon

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Publication details

The article was received on 08 May 2013, accepted on 07 Jun 2013 and first published on 07 Jun 2013


Article type: Paper
DOI: 10.1039/C3TA11823A
Citation: J. Mater. Chem. A, 2013,1, 10243-10250
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    Up-scalable and controllable electrolytic production of photo-responsive nanostructured silicon

    W. Xiao, X. Jin and G. Z. Chen, J. Mater. Chem. A, 2013, 1, 10243
    DOI: 10.1039/C3TA11823A

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