Hamdy Esraa, Saad Laila, Abulfotuh Fuad, Soliman Moataz, Ebrahim Shaker
Materials Science Department, Institute of Graduate Studies and Research, Alexandria University, Alexandria, P.O:832, 21526, Egypt.
Renewable Energy Science and Engineering Department, Faculty of Postgraduate Studies for Advanced Sciences, Bani-Suef University, Beni Suef 62511, Egypt.
ACS Omega. 2020 Aug 20;5(34):21345-21354. doi: 10.1021/acsomega.0c01291. eCollection 2020 Sep 1.
Eutectic molten salts are the most studied medium-high temperature thermal energy storage material due to their potential use in concentrated solar power plants. The aim of this work is to investigate the effect of using reduced graphene oxide (RGO) and graphene quantum dots (GQDs) on the thermal properties of eutectic molten salts. A binary nitrate eutectic mixture of NaNO and KNO was selected as a base material (BM) for nitrate/carbon-derivative composites. RGO and GQDs were individually mixed with the BM with different fractions ranged from 0.1 to 1.5 wt %. The results showed that RGO enhanced the thermal conductivity, heat of fusion, and total thermal energy storage capacity by 52.10%, 44.48%, and 10.44%, respectively. GQDs slightly improved the specific heat capacity for both solid and liquid phases by 2.53% and 3.13%, respectively. In addition, GQDs promoted the heat of fusion by 31.72% and raised the total TES capacity by 12.26%.
共晶熔盐因其在聚光太阳能发电厂中的潜在应用，是研究最多的中高温热能存储材料。这项工作的目的是研究使用还原氧化石墨烯（RGO）和石墨烯量子点（GQDs）对共晶熔盐热性能的影响。选择NaNO和KNO的二元硝酸盐共晶混合物作为硝酸盐/碳衍生物复合材料的基础材料（BM）。RGO和GQDs分别与BM以0.1至1.5 wt%的不同比例混合。结果表明，RGO分别将热导率、熔化热和总热能存储容量提高了52.10%、44.48%和10.44%。GQDs分别使固液相的比热容略有提高，分别提高了2.53%和3.13%。此外，GQDs使熔化热提高了31.72%，并使总TES容量提高了12.26%。
