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首页> 外文期刊>Journal of Energy Storage >Synthesis of Hybrid Graphene/TiO_2 Nanoparticles Based High-Temperature Quinary Salt Mixture for Energy Storage Application
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Synthesis of Hybrid Graphene/TiO_2 Nanoparticles Based High-Temperature Quinary Salt Mixture for Energy Storage Application

机译：基于高温静态盐混合物的杂化石墨烯/ TiO_2纳米粒子的合成

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High temperature and low melting point eutectic mixtures play a significant role in thermal energy storage (TES) and as a heat transfer fluid (HTF). These eutectic mixtures, when dispersed with nanoparticles, further enhance their thermophysical properties. The hybrid Graphene Oxide and titanium (GO/TiO2) nanoparticles (0.01-0.1 wt %) were synthesised using the hydrothermal technique at 180 degrees C for 12 hours in an autoclave. Eutectic salts from a system of nitrate salt mixture composed of sodium (0.558 wt%), potassium (2.118 wt%), lithium (0.738 wt%), calcium (2.478 wt%), and cesium (4.098 wt%) were dispersed into nanosuspension to form a hybrid eutectic mixture for high-temperature applications via series of sonication and heating procedure. The eutectic point (65 degrees C) was predicted using the phase diagram and validated with experimental value observed at 61 degrees C using differential scanning calorimetry (DSC). The enhancement in specific heat in the presence of hybrid nanoparticles ranged from 9.8-19.6% compared to the base salt. Moreover, the addition of 0.05 wt% of hybrid nanoparticle showed the highest specific heat improvement (19.6%) compared to other single nanoparticle concentrations in the literature. The eutectic mixtures showed excellent thermal stability over a temperature range of 580 degrees C, with no significant decomposition in the presence of hybrid nanoparticles. The samples were characterised for structural and morphological changes using ESEM and EDX that showed well-dispersed nanoparticles into the eutectic mixture. FTIR studies confirmed the presence of O-N-O, NO3, and C=N stretching. The interaction between all the nitrate salts and the addition of hybrid nanoparticles did not alter the morphology of the base salts. Raman spectroscopy highlighted the increase in I-D/I-G ratio from 0.91 to 1.05 due to the presence/binding of TiO2 nanoparticles on the graphene sheet. Therefore, a new hybrid GO/TiO2 based high temperature quinary salt mixture showed better reliability and stability for energy storage applications.
机译：高温和低熔点共晶混合物在热能储存（TES）中起着重要作用，作为传热​​液（HTF）。当用纳米颗粒分散时，这些共晶混合物进一步增强了它们的热物理性质。在高压釜中在180℃下使用水热量技术合成杂化石墨烯和钛（GO / TiO 2）纳米颗粒（0.01-0.1wt％）。由钠（0.558wt％），钾（2.118wt％），锂（0.738wt％），钙（2.478wt％）和铯（4.098wt％）组成的硝酸盐混合物系统中的共晶盐分散到纳米皂期中通过一系列超声波和加热程序形成用于高温应用的混合共晶混合物。使用相图预测共晶点（65摄氏度）并使用差示扫描量热法（DSC）在61摄氏度下观察到的实验值进行验证。与基础盐相比，杂交纳米粒子存在下的特定热量的增强范围为9.8-19.6％。此外，与文献中的其他单一纳米颗粒浓度相比，添加0.05wt％的杂化纳米粒子表现出最高的比热改善（19.6％）。共晶混合物在580℃的温度范围内显示出优异的热稳定性，在杂交纳米粒子存在下没有显着分解。使用ESEM和EDX表征样品的结构和形态学，所述ESEM和EDX显示出分散的纳米颗粒进入共晶混合物。 FTIR研究证实了O-N-O，NO3和C = N拉伸的存在。所有硝酸盐之间的相互作用和杂交纳米颗粒的添加并未改变基础盐的形态。拉曼光谱突出显示由于石墨烯片上的TiO 2纳米颗粒的存在/结合，因此I-D / I-G比的增加为0.91至1.05。因此，新的杂交GO / TiO 2的高温静态盐混合物显示出储能应用的更好的可靠性和稳定性。

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