In situ synthesized one-dimensional porous Ni@C nanorods as catalysts for hydrogen storage properties of MgH2.
We have demonstrated an extremely facile procedure for the preparation of 1D porous Ni@C nanostructures by pyrolysis of Ni-based coordination polymer nanorods. The highly aligned Ni-based polymer nanorods were prepared using nitrilotriacetic acid (NTA) as a chelating agent by a one-step solvothermal approach. The obtained precursors are demonstrated to have a well-designed 1D nanostructure and a 3D interconnected mesoporous texture. After thermal treatment, 1D porous Ni@C nanorods were obtained, which basically preserved the morphology of the precursors. In addition, the carbon in the porous Ni@C nanorods is in both crystalline and amorphous states. The as-prepared Ni@C sample displays nanorod-like morphology with about 3 μm length and about 200 nm diameter. With a large surface area of 161.4 m(2) g(-1), this novel material had a good catalytic effect on de/hydrogenation of MgH2. The desorption peak temperature of MgH2-5 wt% Ni@C composites can be lowered more than 57 °C than the pure as-milled MgH2. The MgH2-5 wt% Ni@C composite could desorb 6.4 wt% H2 within 10 min at 300 °C, in contrast, only 2.3 wt% H2 was desorbed even after 100 min for pure MgH2. In addition, an activation energy of 108 kJ mol(-1) for the as-milled MgH2-5 wt% Ni@C composites has been obtained, which exhibit an enhanced kinetics.
Institute of New Energy Material Chemistry, Key Laboratory of Advanced Energy Materials Chemistry (MOE), Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin Key Lab on Metal and Molecule-based Material Chemistry, Nankai University, Tianjin 300071, China. wangyj@nankai.edu.cn.
Cuihua
C
An
Guang
G
Liu
Li
L
Li
Ying
Y
Wang
Chengcheng
C
Chen
Yijing
Y
Wang
Lifang
L
Jiao
Huatang
H
Yuan
D002244:Carbon / Q000737:chemistry*; D002384:Catalysis; D006859:Hydrogen / Q000737:chemistry*; D008274:Magnesium / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry*; D043942:Nanotubes / Q000737:chemistry*; D009532:Nickel / Q000737:chemistry*; D010316:Particle Size; D016062:Porosity; D013499:Surface Properties; D013696:Temperature; D013816:Thermodynamics
D002244:Carbon; D009532:Nickel; D006859:Hydrogen; D008274:Magnesium