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Improved Dehydrogenation Properties of LiBH 4 Using Catalytic Nickel‐ and Cobalt‐based Mesoporous Oxide Nanorods
Author(s) -
Zang Lei,
Zhang Qiuyu,
Li Li,
Huang Yike,
Chang Xiaoya,
Jiao Lifang,
Yuan Huatang,
Wang Yijing
Publication year - 2018
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201701524
Subject(s) - dehydrogenation , nanorod , cobalt , materials science , nickel , mesoporous material , hydrogen storage , catalysis , chemical engineering , cobalt oxide , oxide , nickel oxide , inorganic chemistry , hydrogen , non blocking i/o , alloy , chemistry , metallurgy , nanotechnology , organic chemistry , engineering
Abstract Lithium borohydride (LiBH 4 ) with a theoretical hydrogen storage capacity of 18.5 wt % has attracted intense interest as a high‐density hydrogen storage material. However, high dehydrogenation temperatures and limited kinetics restrict its practical applications. In this study, mesoporous nickel‐ and cobalt‐based oxide nanorods (NiCo 2 O 4 , Co 3 O 4 and NiO) were synthesized in a controlled manner by using a hydrothermal method and then mixed with LiBH 4 by ball milling. It is found that the dehydrogenation properties of LiBH 4 are remarkably enhanced by doping the as‐synthesized metal oxide nanorods. When the mass ratio of LiBH 4 and oxides is 1:1, the NiCo 2 O 4 nanorods display the best catalytic performance owing to the mesoporous rod‐like structure and synergistic effect of nickel and cobalt active species. The initial hydrogen desorption temperature of the LiBH 4 ‐NiCo 2 O 4 composite decreases to 80 °C, which is 220 °C lower than that of pure LiBH 4 , and 16.1 wt % H 2 is released at 500 °C for the LiBH 4 ‐NiCo 2 O 4 composite. Meanwhile, the composite also exhibits superior dehydrogenation kinetics, which liberates 5.7 wt % H 2 within 60 s and a total of 12 wt % H 2 after 5 h at 400 °C. In comparison, pure LiBH 4 releases only 5.3 wt % H 2 under the same conditions.