The invention relates to methods for water surface floating friction generating, electric energy storage, water surface signal source electric quantity supply by stored electric energy, belonging to the field of rescue equipment generation. The methods are characterized in that for solving the problem of water surface generation, the inner surface metallic coating of a hollow big ball is taken asan electrode, and ZnO nanorods are growing on the electrode and form an array; the outer surface metallic coating of a hollow small ball is taken as an electrode, and the electrode adhered to PET (Polyethylene terephthalate) is taken as a friction material; and the hollow small ball is located in the hollow big ball, so that an interval allowing the hollow small ball to move is set between the twoballs, and in water, flowing of water enables the hollow small ball to move, and then the hollow small ball rubs the bumps the hollow big ball, thus realizing the effect of water surface generation.