Zhang Bing, Liu Ronghan, Kimura Hideo, Dou Yuming, Dai Ziyin, Xiao Lirong, Ni Cui, Hou Chuanxin, Sun Xueqin, Yu Ronghai, Du Wei, Xie Xiubo
School of Environmental and Material Engineering, Yantai University, No. 30 Qingquan Road, Yantai 264005, China.
Key Laboratory of Aerospace Materials and Performance (Ministry of Education), School of Materials Science and Engineering, Beihang University, Beijing 100191, China.
Nanomaterials (Basel). 2023 Apr 9;13(8):1321. doi: 10.3390/nano13081321.
ZnO nanoparticles in a spherical-like structure were synthesized via filtration and calcination methods, and different amounts of ZnO nanoparticles were added to MgH 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 MgH-2.5 wt% ZnO composite reveals excellent performance among the three samples. The results show that the MgH-2.5 wt% ZnO sample can swiftly absorb 3.77 wt% H in 20 min at 523 K and even at 473 K for 1 h can absorb 1.91 wt% H. Meanwhile, the sample of MgH-2.5 wt% ZnO can release 5.05 wt% H at 573 K within 30 min. Furthermore, the activation energies (E) of hydrogen absorption and desorption of the MgH-2.5 wt% ZnO composite are 72.00 and 107.58 KJ/mol H, respectively. This work reveals that the phase changes and the catalytic action of MgH 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.
通过过滤和煅烧方法合成了球状结构的氧化锌纳米颗粒，并通过球磨将不同量的氧化锌纳米颗粒添加到氢化镁中。扫描电子显微镜图像显示，复合材料的尺寸约为2μm。不同状态的复合材料由大颗粒组成，小颗粒覆盖在大颗粒上。经过吸氢和解吸循环后，复合材料的相发生了变化。在三个样品中，MgH-2.5 wt% ZnO复合材料表现出优异的性能。结果表明，MgH-2.5 wt% ZnO样品在523 K下20分钟内可迅速吸收3.77 wt% 的氢，甚至在473 K下1小时可吸收1.91 wt% 的氢。同时，MgH-2.5 wt% ZnO样品在573 K下30分钟内可释放5.05 wt% 的氢。此外，MgH-2.5 wt% ZnO复合材料吸氢和解吸的活化能（E）分别为72.00和107.58 KJ/mol H。这项工作揭示了添加氧化锌后氢化镁在循环中的相变和催化作用，并且氧化锌的简便合成可为更好地合成催化剂材料提供方向。
