Phase Transformation and Performance of Mg-Based Hydrogen Storage Material by Adding ZnO Nanoparticles
Bing Zhang,
Ronghan Liu,
Hideo Kimura,
Yuming Dou,
Ziyin Dai,
Lirong Xiao,
Cui Ni,
Chuanxin Hou,
Xueqin Sun,
Ronghai Yu,
Wei Du,
Xiubo Xie
Affiliations
Bing Zhang
School of Environmental and Material Engineering, Yantai University, No. 30 Qingquan Road, Yantai 264005, China
Ronghan Liu
School of Environmental and Material Engineering, Yantai University, No. 30 Qingquan Road, Yantai 264005, China
Hideo Kimura
School of Environmental and Material Engineering, Yantai University, No. 30 Qingquan Road, Yantai 264005, China
Yuming Dou
School of Environmental and Material Engineering, Yantai University, No. 30 Qingquan Road, Yantai 264005, China
Ziyin Dai
School of Environmental and Material Engineering, Yantai University, No. 30 Qingquan Road, Yantai 264005, China
Lirong Xiao
School of Environmental and Material Engineering, Yantai University, No. 30 Qingquan Road, Yantai 264005, China
Cui Ni
School of Environmental and Material Engineering, Yantai University, No. 30 Qingquan Road, Yantai 264005, China
Chuanxin Hou
School of Environmental and Material Engineering, Yantai University, No. 30 Qingquan Road, Yantai 264005, China
Xueqin Sun
School of Environmental and Material Engineering, Yantai University, No. 30 Qingquan Road, Yantai 264005, China
Ronghai Yu
Key Laboratory of Aerospace Materials and Performance (Ministry of Education), School of Materials Science and Engineering, Beihang University, Beijing 100191, China
Wei Du
School of Environmental and Material Engineering, Yantai University, No. 30 Qingquan Road, Yantai 264005, China
Xiubo Xie
School of Environmental and Material Engineering, Yantai University, No. 30 Qingquan Road, Yantai 264005, China
ZnO nanoparticles in a spherical-like structure were synthesized via filtration and calcination methods, and different amounts of ZnO nanoparticles were added to MgH2 via ball milling. The SEM images revealed that the size of the composites was about 2 μm. The composites of different states were composed of large particles with small particles covering them. After the absorption and desorption cycle, the phase of composites changed. The MgH2-2.5 wt% ZnO composite reveals excellent performance among the three samples. The results show that the MgH2-2.5 wt% ZnO sample can swiftly absorb 3.77 wt% H2 in 20 min at 523 K and even at 473 K for 1 h can absorb 1.91 wt% H2. Meanwhile, the sample of MgH2-2.5 wt% ZnO can release 5.05 wt% H2 at 573 K within 30 min. Furthermore, the activation energies (Ea) of hydrogen absorption and desorption of the MgH2-2.5 wt% ZnO composite are 72.00 and 107.58 KJ/mol H2, respectively. This work reveals that the phase changes and the catalytic action of MgH2 in the cycle after the addition of ZnO, and the facile synthesis of the ZnO can provide direction for the better synthesis of catalyst materials.
