Preparation method for composite porous structure and composite porous structure made thereby

A preparation method for a composite porous structure, comprising the following steps:

• step (a):
• preparing a porous substrate having multiple pores, a first surface and a second surface opposite to the first surface;
• and
• step (b):
• continuously feeding a cooling fluid to contact the first surface and to flow continuously to the second surface through the pores of the porous substrate, and heating a coating material to multiple molten particles by a heat source and spraying the molten particles onto the second surface of the porous substrate, so as to form a coating layer having multiple micropores on the second surface of the porous substrate and obtain the composite porous structure;
• wherein a flow rate of the cooling fluid is between 0.1 L/min and 10 L/min, and a ratio of inflow volume to outflow volume of the cooling fluid is between 1:0.9 and 1:1;
• wherein the coating material is an organic polymer coating material or an inorganic coating material;
• the coating layer having multiple micropores has an average thickness of 5 μm to 500 μm;
• and an average pore size of the micropores is between 0.01 μm and 5 μm.