Abstract
Phased energy storage technologies are highly advantageous and feasible for storing and utilizing clean renewable energy resources, for instance, solar energy and waste heat, and it is an effective method to improve energy efficiency and save energy. However, phase change energy storage has some problems, for example, low thermal conductivity and phase change leakage, which lead to limited application. In this paper, anisotropic graphene aerogels were prepared by ice crystal template method with high thermal conductivity of graphene, and silver was attached to the pore wall graphene sheets and the graphene sheet boundaries of the aerogels. The results show that anisotropic graphene aerogels were successfully prepared, and SEM and EDS indicate that up to 9.14 at % silver was successfully attached to the graphene sheets and boundaries. The anisotropic thermal conductivity of the PArGO phase change composites after adsorption of the paraffin is significant, with a maximum axial thermal conductivity of PArGO of 1.20 W/(mK) and radial thermal conductivity of 0.54 W/(mK), compared to the pure paraffin (0.26 W/(mK)) increased by 362% and 108%, respectively. The enthalpy of the composite has been reduced to 149.6 J/g due to the silver particles attached, but the thermal properties have been greatly improved. In experiments simulating real temperature changes, PArGO achieves phase transitions very fast, with a 74% improvement on thermal efficiency of storage and discharge over the pure paraffin.
Highlights
With the growing demand of energy consumption, the problem of shortages of common fossil fuels and the accompanying environmental pollution has become more serious
The enthalpy of the composite has been reduced to 149.6 J/g due to the silver particles attached, but the thermal properties have been greatly improved
Anisotropic graphene aerogels were prepared by directional freezing, and silver particles were attached on the sheet layers and boundaries of graphene by silver mirror reaction to improve the thermal conductivity of the phase change material
Summary
With the growing demand of energy consumption, the problem of shortages of common fossil fuels and the accompanying environmental pollution has become more serious. The need to find renewable and clean energy sources is becoming urgent. Thermal energy storage technology is one of the ideal solutions that offers clear economic advantages in terms of reducing energy wastage and costs. It is a clean and reusable technology. Phased energy storage technologies are highly advantageous and feasible for storing and utilizing clean renewable energy sources, such as solar energy and waste heat, and it is one of effective methods to improve energy efficiency and save energy. Phase change material (PCM) is a key factor in phase change energy storage technology
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
