Phase changing materials (PCM) release or absorb heat in high quantity when there is a variation in phase. PCMs show good energy storage density, restricted operating temperatures and hence find application in various systems like heat pumps, solar power plants, electronic devices, thermal energy storage (TES) systems. Though it has extensive usage in such a diverse range of systems, PCMs have some limitations like poor thermal conductivity, susceptibility to leakage during phase transformations. To overcome these shortcomings, phase changing composites (PCCs) were fabricated. PCCs are an amalgamation of filler material with PCMs to form a composite with those anticipated or desired properties. There are multiple factors like porosity, sealing performance, leaking holding capacity, shape stability, thermal conductivity that should be taken into consideration/account while fabricating PCCs. Having considered such factors, graphene, which has high thermal conductivity (2000–4000 W/m K) and high specific surface area (~ 2630 m2 g−1), acts as a suitable candidate for synthesizing an effective and efficient PCC. In its aerogel form, it is used as a conductive filler or form-stabilizer, to improve the thermal conductivity (~ 5.89 W/m K) and heat transfer of PCMs like reduced graphene oxide. Graphene aerogels, thus, are used in PCM as latent heat storage (LHS) for thermal energy storage systems. Many of the researchers have based their work focus on graphene aerogels in PCMs, significant roles of such PCCs, their advantages and disadvantages; this paper is an effort to elucidate those and provide further insight into TES systems in which LHS is explicitly used in PCMs and their practical aspect.

中文翻译：

---

用于热能存储系统的石墨烯气凝胶基相变复合材料

当相发生变化时，相变材料 (PCM) 会释放或吸收大量热量。PCM 显示出良好的储能密度、受限的工作温度，因此可应用于各种系统，如热泵、太阳能发电厂、电子设备、热能储存 (TES) 系统。尽管它在如此多样化的系统中得到了广泛的应用，但 PCM 有一些局限性，例如导热性差、相变过程中容易泄漏。为了克服这些缺点，制造了相变复合材料（PCC）。PCC 是填充材料与 PCM 的混合物，以形成具有那些预期或所需特性的复合材料。有多种因素，如孔隙率、密封性能、泄漏保持能力、形状稳定性、制造 PCC 时应考虑/考虑的热导率。考虑到这些因素，石墨烯具有高热导率（2000-4000 W/m K）和高比表面积（~2630 m2 g-1），是合成有效 PCC 的合适候选者。在其气凝胶形式中，它用作导电填料或形状稳定剂，以提高 PCM 的热导率 (~ 5.89 W/m K) 和热传递，如还原氧化石墨烯。因此，石墨烯气凝胶在 PCM 中用作热能存储系统的潜热存储 (LHS)。许多研究人员的工作重点是 PCM 中的石墨烯气凝胶、这种 PCC 的重要作用、它们的优缺点；