Rationalisation and optimisation of solid state electro-reduction of SiO2 to Si in molten CaCl2 in accordance with dynamic three-phase interlines based voltammetry

Facile synthesis of freestanding Si nanowire arrays by one-step template-free electro-deoxidation of SiO2 in a molten salt

“…The first stage of high current may be caused by the surface SiO 2 consumption, 18 and may also correspond to the formation of the disordered silicon layer. To analyse the growth process, six samples were prepared in different batches and a linear fitting could be gained on the thickness of nanowire arrays versus the consumed electric quantity.…”

Difference in the Mechanism of Electrochemical Deoxidation of Conducting and Non-conducting Solid Oxide Preforms: An Experimental Demonstration with TiO2 and SiO2 Pellet Electrodes in CaCl2 Melt

“…the 3PI mechanism explained above [17][18][19][20][21][22]27,28] . The initiation-expansion-shrinking-disappearance (IESD) process of the solid (conductive product)/solid (oxide)/liquid (electrolyte) three-phase reaction boundary (TPB), proposed to explain the electro-deoxidation of insulating compounds [29] , fits well with the deoxidation pattern of insulating SiO 2 preforms [23,[30][31][32][33] .…”

“…[3,7,8] . Several studies have been reported on the electrochemical reduction of oxides such as TiO 2 [1,3,5,[8][9][10][11] , Nb 2 O 5 [7,12,13] , UO 2 [14][15][16] , SiO 2 [17][18][19][20][21][22][23][24][25][26] etc. The process is being pursued in view of production of solar grade silicon as well [27] .…”

In-situ synthesis of MoSi2 coating on molybdenum substrate by electro-deoxidation of a SiO2 layer in molten salt

“…6B and C. These features were resembled that of the irreversible thin-layer system controlled mainly by the slow rate of electron transfer [23]. Based on the theoretical model established in previous reports [15], if the electro-deoxidation process is charge transfer controlled, the equation is established as follows:…”

“…So far, most of the published works using the electrodeoxidation method have been focused on the fabrication of numerous metals and alloys powders, such as Ti [12], Cr [13], Ta [14], Si [15], Ti x Si y intermetallic compounds [16], TbFe 2 [17], AB 5 -type [18][19][20] and AB 2 -type [21] Hydrogen storage alloys, directly from their metal oxides. Meanwhile, functional coatings prepared by the electro-deoxidation method have also been demonstrated [22].…”