Premium
Catalytic De/Hydrogenation in Mg by Co‐Doped Ni and VO x on Active Carbon: Extremely Fast Kinetics at Low Temperatures and High Hydrogen Capacity
Author(s) -
Jia Yi,
Cheng Lina,
Pan Nan,
Zou Jin,
Max Lu Gaoqing,
Yao Xiangdong
Publication year - 2011
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201000025
Subject(s) - catalysis , materials science , hydrogen , hydrogen storage , activation energy , carbon fibers , metal , desorption , inorganic chemistry , doping , chemical engineering , nuclear chemistry , chemistry , metallurgy , adsorption , composite number , alloy , organic chemistry , composite material , engineering , optoelectronics
A multi‐component catalyst Ni‐VO x /AC (VO x is comprised of V 2 O 5 and VO 2 , x = 2.18) was synthesized by a wet impregnation method. The synthesized Ni‐VO x /AC shows a superior catalytic effect on de/hydrogenation of Mg. The MgH 2 +Ni‐VO x /AC composites can absorb 6.2 wt.‐% hydrogen within only 1 min at 150 °C under a hydrogen pressure of 2 MPa and desorb 6.5 wt.‐% hydrogen within 10 min at 300 °C under an initial hydrogen pressure of 1 KPa, which overcomes a critical barrier for practical use of Mg as a hydrogen storage material. A significant decrease of activation energy ( E a ) indicates that Ni‐VO x /AC catalyst is highly efficient for Mg de/hydrogenation, which may be ascribed to the synergistic effect of bimetals (metal oxides) and nanocarbon.