Electrical device with silicon nano-particles

An electrical device, comprising:

• an electrically-conductive substrate having a flexible structure and porous silicon nano-particles, wherein the flexible structure is formed by coating, encapsulating, and entangling the electrically-conductive substrate with the porous silicon nano-particles, and wherein the porous silicon nano-particles are produced according to steps of:
• (I) alloying a raw silicon material with at least one distillable alloying metal selected from zinc and magnesium to form an alloy;
• (II) milling the alloy to form alloy nano-particles of 100 nm-150 nm in diameter, the milling being performed in an inert environment to alleviate oxidation of the alloy;
• (III) distilling the alloying metal from the alloy nano-particles so that a porous silicon structure is produced, the distilling being performed in a vacuum furnace;
• and
• (IV) milling the porous silicon structure in an inert environment to break the porous silicon structure apart, thereby to produce the porous silicon nano-particles.