Hydrogen absorption in carbon allotropes and talc

Abstract

Carbon is frequently used as an additive that facilitates fine ball-milling of hydrogen storage (HS) alloys. It is commonly supposed that the carbon does not take part significantly in HS above the room temperature. In the present paper, hydrogen sorption in three carbon allotropes (carbon black, graphite and modified carbon nano-plates) and in magnesium silicate monohydrate (talc) was studied in temperature interval from 423 to 623 K. HS capacity from about 0.4 wt.% H2 (talc) to about 1.1 wt.% H2 (carbon black) was observed at a hydrogen pressure of 25 bar. The HS in all the studied materials was very weakly temperature activated. K e y w o r d s : hydrogen absorption, hydrogen storage, ball milling, carbon

Significant decrease of hydride decomposition enthalpy in ordered Mg-In alloys induced by growing hydrogen concentration

“…Many diverse materials for HS were investigated up to now [9,10], but the magnesium hydride MgH 2 remains one of the most prospective ones [11][12][13][14][15][16][17][18][19][20][21] due to relatively high storage capacity, favorable production costs, abundance of Mg and, last but not least, to bio-neutral reaction and non-toxicity of Mg.…”