Six-membered high-entropy foams for hydrogen production by water splitting and preparation methods thereof

A method for preparing a six-membered foam for hydrogen production by water splitting, wherein the six-membered foam consists of:

• 10 at %-25 at % of Ni, 10 at %-25 at % of Fe, 10 at %-25 at % of Cu, 10 at %-25 at % of Co, 10 at %-25 at % of Mo, and 10 at %-25 at % of Pt, the method comprising:
• operation (1), obtaining a colorless and transparent solution by dissolving complexes (NH4)2SO4, Na3C6H5O7, and H3BO3 in ultrapure water under stirring;
• operation (2), obtaining a mixed solution by dissolving metal salts NiSO4, Fe2(SO4)3, CuSO4, CoSO4, Na2MoO4, and K2PtCl4 in the colorless and transparent solution in sequence under stirring;
• operation (3), obtaining an initial six-membered foam by using a Ni sheet as a working electrode and a Pt sheet as a counter electrode, controlling a temperature to 25° C., and performing constant current electrodeposition on the mixed solution;
• operation (4), after the constant current electrodeposition is completed, obtaining a washed six-membered foam by immersing the initial six-membered foam in the ultrapure water to remove residual impurities on a surface of the initial six-membered foam and washing for three times;
• and
• operation (5), obtaining the six-membered (NiFeCuCoMoPt) foam by placing the washed six-membered foam in a freeze dryer and freeze-drying for 4 h.