Publication: Surface Physicochemical Treatment of Nickel Foam for Increasing Its Electrocatalytic Activity in Overall Water Splitting
Дата
2020
Авторы
Fominski, D. V.
Nevolin, V. N.
Romanov, R. I.
Fominski, V. Y.
Komleva, O. V.
Kartsev, P. F.
Novikov, S. M.
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© 2020, Pleiades Publishing, Ltd.Abstract: The possibility of using physicochemical methods for treating a nickel foam to increase its electrocatalytic activity in hydrogen and oxygen evolution reactions in an aqueous alkaline solution was studied. The modification of a 1-mm-thick sheet of the foam was carried out through its surface and included physical deposition of pulsed laser plasma for the formation of catalytic MoSx and MoSxSey films, followed by their annealing. The effect of foam pretreatment by sulfurization in H2S under varying conditions and formation of catalytic layers with different structures and compositions was studied. The best improvement in the electrocatalytic performance of the foam was exerted by thin-film coatings of molybdenum sulfide and sulfide/selenide with a nanocrystalline structure formed on the surface of a foam with a Ni3S2 underlayer. The possibility of a synergetic effect of the formed phases was analyzed by DFT calculations. For the optimum composition of the modified layers, the overvoltage of H2 evolution (for a current density of 10 mA/cm2) decreased to 155 mV, and the overvoltage of O2 evolution did not exceed 160 mV. The electrocatalytic characteristics obtained by this treatment are not inferior to those for the best modern electrocatalysts created on nickel foam by widely used methods of hydrothermal synthesis or electrodeposition.
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Surface Physicochemical Treatment of Nickel Foam for Increasing Its Electrocatalytic Activity in Overall Water Splitting / Fominski, D.V. [et al.] // Inorganic Materials: Applied Research. - 2020. - 11. - № 2. - P. 458-466. - 10.1134/S2075113320020124