Analysis of heat conducting enhancement measures on the composite for hydrogen storage by incorporation of activated carbon with MOFs. (1st February 2023)

• Record Type: Journal Article
• Authors: Wu, Mengbo; Zheng, Qingrong; Sun, Tingquan; Zhang, Xuan
• Is Part Of: International journal of hydrogen energy. Volume 48:Number 10(2023)
• Page Start: 3994
• Page End: 4005
• Publication Date: 2023-02-01
• Subjects: MOFs -- Activated carbon -- Incorporation -- Hydrogen storage -- Heat conducting enhancement; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2022.10.245
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: Experiments and numerical simulations were conducted for evaluating measures for enhancing adsorption capacity and heat conducting of an on board MOFs hydrogen storage system by cryo-adsorption. Solvothermal method was employed to synthesize MIL-101(Cr) composite by incorporating activated carbon. The composite was undergone structure characterization, structural morphology observation, thermal conductivity measurement and measurement of isotherm of hydrogen adsorption at 77.15 K within 0–6 MPa. Effect of adding expanded natural graphite (ENG) and equipping a honeycomb heat exchanging device (HHED) on mitigating the thermal effect on a 0.5 L hydrogen storage vessel packed with composite was investigated within a flow rate of hydrogen required by a ship's power unit. It shows that the sample incorporated by 1 wt% activated carbon respectively obtained about 14.5%, 26.2% and 5.7% increment in specific surface area, micropore volume and the maximum excess adsorption amount. Results also reveal that, within the flow rate 5 L·min −1 -25 L min −1, the mean relative error between the experimental data and those from simulations is less than 1.61%, and the reduction in temperature fluctuation of the storage system is about 5 °C and 4 °C on charge and discharge process while equipping the HHED, which accordingly brought about 17%, 24.3%, 18.5% increment in accumulated amount of charge and discharge as well as the useable capacity ratio (UCR) of the system. It suggests that equipping a HHED is a more promising method for weakening the thermal effect on MOFs-hydrogen storage systems. Highlights: Relationship between incorporated amount of AC and hydrogen adsorption capacity of composites. Relationship between added ENG and the thermal conductivity of the composite. Toth equation is suitable for analyzing adsorption equilibrium of hydrogen on composites. Equipping HHED is a better measure than adding ENG for managing thermal effect on storage systems.