TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The porous permeable metal substrate is made from nickel, nickel alloy, stainless steel, iron-nickel alloy or iron-chromium alloy. The porous permeable metal substrate has: a thickness of 0.6-2 mm; and a permeability of larger than 1 Darcy. The diffusion barrier layer is made of a compound with perovskite structure comprising lanthanum strontium manganese chromite, lanthanum strontium manganese cobaltite, lanthanum strontium chromite or lanthanum strontium cobaltite. The lanthanum-strontium-manganese-chromite is of formula (La(0.75)Sr(0.25)Cr(0.5)Mn(0.5)). The diffusion barrier layer has a thickness of 10-20 mu m. The diffusion barrier layer is a permeable layer and having pore size of less than 5 mu m. The metal nanoparticles are made from nickel or copper or cobalt. The metal oxide nanoparticle is made from yttrium stabilized zirconia, scandia stabilized zirconia, gadolinia-doped ceria or lanthanum-doped ceria. The size of the metal nanoparticle is 30-100 nm. The size of the metal oxide nanoparticle is 10-40 nm. The nano-composite film has a thickness of 20-30 mu m. The size of the nano gas pores and the size of the nano gas channel are less than 100 nm. The first powder cluster comprises an organic adhesive binder and powders of one compound comprising lanthanum strontium manganese chromite, lanthanum strontium manganese cobaltite, lanthanum strontium chromite or lanthanum strontium cobaltite. The organic adhesive binder is polyvinyl alcohol. The second powder cluster comprises metal oxide nanoparticles consisted of two kinds of anode materials and the organic adhesive binder. The second powder cluster is micron-sized, preferably 1-100 mu m. Preferred Method: The porous permeable metal substrate is preheated to 600-900 degrees C. The high temperature and high speed plasma flame produced in atmospheric plasma spray is generated in ambient air. The atmospheric plasma spray is performed by a robotic arm that scans at a scanning speed of 300-3000 cm/minute. In the method: an operating current of the atmospheric plasma spray is 318-400 ampere (A); an operating voltage of the atmospheric plasma spray is 100-110V; an operating power of the atmospheric plasma spray is 35-45 kW; a width of a path scanned by the robot arm is 0.5-3 cm; a gas mixture is used in the atmospheric plasma spray and the gas mixture includes a gas mixture of argon and hydrogen, a gas mixture of argon and helium, a gas mixture of argon and nitrogen, a gas mixture of argon, hydrogen and helium, a gas mixture of argon, nitrogen and helium or a gas mixture of argon, hydrogen, helium and nitrogen; a flow rate of the argon gas is 38-80 standard liter per minute (slpm), a flow rate of the hydrogen gas is 3-10 slpm, a flow rate of the helium gas is 8-40 slpm, and a flow rate of the nitrogen gas is 3-20 slpm; two kinds of anode materials for the metal oxide nanoparticles include one kind of material comprising yttrium stabilized zirconia, scandia stabilized zirconia, gadolinium-doped ceria or lanthanum-doped ceria and the other kind of material comprising nickel oxide, copper oxide or cobalt oxide; and a distance between the porous permeable metal substrate and the nozzle of a plasma torch for generating the high temperature high speed plasma flame is 8-12 cm. The hydrogen reduction has a temperature of 500-800 degrees C and a reaction time of 2-10 hours. The step of reducing the nano-composite film by hydrogen reduction, a mixed gas of 7% of hydrogen gas and 93% of argon gas is used. The method further comprises: coating other functional thin films of a solid oxide fuel cell over the nanocomposite film, after the step of reducing the nano-composite film by hydrogen reduction; and coating other functional thin films of the solid oxide fuel cell over the nanocomposite film, before the step of reducing the nano-composite film by hydrogen reduction.