Preparation method and application of three-dimensional dendritic crystal porous silicon

The invention provides a preparation method and application of three-dimensional dendritic crystal porous silicon, and belongs to the field of porous silicon preparation. The preparation method has the technical scheme that the preparation method comprises the following steps of Step 1, preparing a precursor alloy; Step 2, putting the precursor alloy, with the thickness being 5 mum to 500 mum, obtained in the Step 1 into corrosion liquid to be subjected to dealloying treatment for obtaining a dealloyed specimen; and Step 3, performing subsequent treatment to obtain a three-dimensional micrometer/nanometer dendritic crystal structure porous silicon material. The preparation method and the application of the three-dimensional dendritic crystal porous silicon have the beneficial effects thatcasting aluminum-silicon alloys commonly used in production are used as raw materials, so that the production cost is greatly reduced; meanwhile, the difficult problem that for powder materials, precursor alloy metallographic