Sun Lei, Sun Rong, Liu Jianjun, Zhu Mengzhou, Zhang Xiaoqin, Guo Dongliang, Yin Kangyong, Zhuang Zhiyun, Zhu Xueqiong, Xiao Peng
State Grid Jiangsu Electric Power Co., Ltd Research Institute, Nanjing 211103, Jiangsu, P. R. China.
Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, Suzhou, 215213, Jiangsu, P. R. China.
Nanoscale. 2024 Oct 31;16(42):19873-19880. doi: 10.1039/d4nr02868f.
MgH used in solid-state hydrogen storage still suffers from high thermal stability and slow hydrogen absorption-desorption kinetics. Here, we report a hybrid of MgH-TiC/graphene prepared through a facile wet chemical method followed by a ball-milling method. It was confirmed that the coupling of TiC and graphene possesses a synergistic effect on the hydrogen desorption and absorption reactions of MgH/Mg. The initial temperature of MgH-TiC/graphene to desorb hydrogen was reduced to 169 °C significantly and it could desorb 6.8 wt% H within 6 min at a constant temperature of 300 °C. Moreover, the desorbed sample could start to absorb hydrogen at room temperature and achieve a capacity of 6.0 wt% when the temperature was gradually increased to 350 °C. These results are far superior to pristine MgH, disclosing that the addition of two-dimensional TiC/graphene is an efficient strategy to boost the hydrogen storage performance of MgH.
用于固态储氢的氢化镁仍然存在热稳定性高和氢吸附-解吸动力学缓慢的问题。在此，我们报道了一种通过简便的湿化学方法然后球磨法制备的MgH-TiC/石墨烯复合材料。证实了TiC与石墨烯的耦合对MgH/Mg的氢解吸和吸收反应具有协同作用。MgH-TiC/石墨烯解吸氢的起始温度显著降低至169℃，并且在300℃恒温下6分钟内可解吸6.8 wt%的氢。此外，解吸后的样品在室温下即可开始吸氢，当温度逐渐升至350℃时吸氢容量可达6.0 wt%。这些结果远远优于原始的氢化镁，表明添加二维TiC/石墨烯是提高氢化镁储氢性能的有效策略。
