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易倍体育官网:易倍体育官网-研究生俞海杰,教师郑家广(通讯)、肖蓓蓓(通讯)、魏涛(通讯)等的研究成果“The effect of different Co phase structure (FCC/HCP) on the catalytic action towards the hydrogen storage performance of MgH2 ”在《 Chinese Journal of Chemical Engineering》上发表

发布时间:2021-12-30动态浏览次数:223

近期,易倍体育官网-研究生俞海杰,教师郑家广(通讯)、肖蓓蓓(通讯)、魏涛(通讯)等的研究成果The effect of different Co phase structure (FCC/HCP) on the catalytic action towards the hydrogen storage performance of MgH2在《 Chinese Journal of Chemical Engineering》上发表。

论文简介如下:

High hydrogen desorption temperature and sluggish reaction kinetics are the major limitations for the practical application of MgH2.In this study, Co particles with a face centered cubic (FCC)structure and a hexagonal close packed (HCP) structure were prepared facilely and proved to be good catalysts for magnesium hydride.Co particles with FCC structure presented better catalytic effect on MgH2 than that with HCP structure. Both 7wt% Co FCC and HCP particle modified MgH2 decreased the initial dehydrogenation temperature from 301.3 °C to approximately 195.0 °C, but 7wt% Co with FCC structure modified MgH2has a faster desorption rate, and around 6.5 wt% H2 was desorbed in 10 min at 325 °C. Hydrogen uptake was detected at 70 °C under 32.5 bar hydrogen pressure and 6.0 wt% H2 was recharged in 40 min at 150 °C. The hydrogen desorption and absorption activation energy for 7wt% FCC Co modified MgH2 was significantly decreased to 76.6±8.3 kJ mol?1 and 68.3±6.0 kJ mol?1, respectively. Thermodynamic property was also studied, the plateau pressures of MgH2+7 wt% FCC Co were determined to be 1.40, 2.80, 5.37 and 9.88 bar for 300 ℃, 325 ℃, 350 ℃ and 375℃. The decomposition enthalpy of hydrogen (ΔH) for MgH2+7 wt% FCC Co was 80.6±0.1 kJ mol-1 ,5.8 kJ mol-1 lower than that of as-prepared MgH2.Moreover, cycling performance for the first 20 cycles revealed that the reaction kinetics and capacity of MgH2-FCC Co composite remained almost unchanged.The result of density functional theory calculation demonstrated that cobalt could extract the Mg-H bond and reduced the decompose energy of magnesium hydride. Our paper can be presented as a reference for searching highly effective catalysts for hydrogen storage and other energy-related research fields.

全文下载:https://www.sciencedirect.com/science/article/abs/pii/S1004954121005681


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