【摘 要】
：
Metal foams with hierarchically porous structures are highly desirable in energy applications as active materials or their host substrates.However,conventional preparation methods usually have a quite lim-ited flexibility of adjusting pore size of metal f
【机 构】
：
Shenyang National Laboratory for Materials Science,Institute of Metal Research,Chinese Academy of Sc
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Metal foams with hierarchically porous structures are highly desirable in energy applications as active materials or their host substrates.However,conventional preparation methods usually have a quite lim-ited flexibility of adjusting pore size of metal foams.Herein,an alternative new method based on gaseous thermal oxidation-nitridation-denitridation processes was developed to prepare metal(copper and nickel)foams with adjustable pore size by controlling the thermal nitridation temperature.Moreover,this environment-friendly method is independent of the shape of starting pure metal substrates and can be repeatedly applied to the metal substrates to create hierarchical porous structures containing dif-ferent size pores.As a demonstration of the advantages of the resultant foams with abundant pores by this method,compared with its starting material(commercial Ni foam with the pore size of several mil-limeters),the resultant hierarchical porous Ni foam gives the remarkably enhanced performance of elec-trochemical water splitting as HER/OER electrodes and electrochemical energy storage as the host substrate of capacitive material MnO2.The metal foams with adjustable pore size prepared by the devel-oped method will find a wide range of important applications in energy storage and conversion areas.
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