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The article addresses the thermophysical properties of porous silicon (PS)samples produced through electrochemical (EC), metal-assisted chemical (MACE),and combined (MACE + EC) etching methods. The PS/MACE+EC sample'sthermophysical properties exhibited higher values than both the PS/EC andPS/MACE. The energy activity associated with the process of water splitting onthe surface of porous silicon (PS) formed by the metal-assisted chemicaletching (MACE) combined with the electrochemical etching (EC) method is foundto be more significant compared to the PS samples prepared using only EC orMACE techniques. The combined MACE/EC method is considered the most effectivetechnique for obtaining PS with a nanoporous silicon surface, which has thehighest energy activity in water-splitting processes. The activation energyrequired for water splitting, denoted as Ea (PS/MACE+EC), exhibits a highervalue compared to the activation energies observed for the Ea (PS/EC) and Ea(PS/MACE) samples. The inclusion of nickel (Ni) particles within the pores ofporous silicon (PS<Ni>) serves to stabilize the thermophysical properties ofthe material. Consequently, this prevents substantial alterations in thethermal characteristics of PS<Ni> compared to PS without nickel in its pores.The samples containing nickel (PS/MACE) and PS/MACE+EC exhibit long-termpreservation of their energy activity (Ea) for one year. This phenomenon occursdue to the presence of nickel-containing nanopores within the samples. Thearticle additionally examines the thermophysical properties of porous silicon(PS) in comparison to crystalline silicon (c-Si) and powdered silicon(powder-Si).

Thermophysical Characteristics of the Porous Silicon Samples Formed by Electrochemical, Chemical and Combined Etching Methods