Obtaining particles with the structure Mg@C and (Mg@C)@Pd, their properties and stability in the hydrogenation/dehydrogenation processes : научное издание

Описание

Тип публикации: статья из журнала

Год издания: 2021

Идентификатор DOI: 10.1016/j.ijhydene.2021.03.042

Ключевые слова: core-shell particles, Hydrogen-storage materials, magnesium hydride, Mg, С, Рd nanoparticles, Sorption capacity of hydrogen

Аннотация: In this work, we studied the change in the properties of powders with a core (magnesium) – shell structure (carbon and carbon/palladium) in the process of hydrogenation/dehydrogenation with hydrogen (99.995 wt%). Magnesium powders were obtained by plasma chemical synthesis in an atmosphere of argon containing a small amount of hydrogen (2–3 at.%) and nitrogen (8–9 at.%), when performing a low-frequency arc discharge between a tungsten electrode and a magnesium melt. The shell (carbon and carbon/palladium) was deposited in a plasma generator with vortex and magnetic stabilization. For all samples, a decrease in the sorption capacity of hydrogen was observed as a result of successive cycles of sorption and desorption reactions. It was found that the reason for this fall is associated with the formation of the MgO and Mg(OH)2 phase, which prevents the diffusion of hydrogen. The carbon shell provides a more complete hydrogenation of the magnesium particles, and an additional palladium shell increases the resistance to cyclic hydrogenation/dehydrogenation and reduces the temperature of these processes. According to the data obtained, powders with particles (Mg@C)@Pd can absorb the largest amount of hydrogen (6.9 wt%) for the duration of 5 cycles, after which the protective shell of the particles begins to collapse and a loss of sorption capacity is observed.

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Издание

Журнал: International Journal of Hydrogen Energy

ISSN журнала: 03603199

Издатель: Elsevier Science Publishing Company, Inc.

Персоны

  • Churilov G.N. (Siberian Fed Univ, Inst Engn Phys & Radio Elect, Svobodny 79, Krasnoyarsk 660041, Russia; Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Akademgorodok 50-38, Krasnoyarsk 660036, Russia)
  • Nikolaev N.S. (Siberian Fed Univ, Inst Engn Phys & Radio Elect, Svobodny 79, Krasnoyarsk 660041, Russia; Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Akademgorodok 50-38, Krasnoyarsk 660036, Russia)
  • Elesina V.I (Siberian Fed Univ, Inst Engn Phys & Radio Elect, Svobodny 79, Krasnoyarsk 660041, Russia; Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Akademgorodok 50-38, Krasnoyarsk 660036, Russia)
  • Glushenko G.A. (Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Akademgorodok 50-38, Krasnoyarsk 660036, Russia)
  • Isakova V.G. (Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Akademgorodok 50-38, Krasnoyarsk 660036, Russia)
  • Tomashevich Ye (Fed Res Ctr KSC SB RAS, Inst Chem & Chem Technol, Akademgorodok 50-24, Akademgorodok 660036, Russia)

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