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Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/217223
Synthesis and Optimisation of Layered Hybrid Organic-Inorganic Perovskites as Solid-State Thermal Energy Storage Materials
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[eng] The effective use of thermal energy storage (TES) systems has demonstrated their ability to enhance energy efficiency and sustainability across various sectors. These systems play a critical role in facilitating the integration of renewable energy sources and enhancing the overall efficiency of heating and cooling systems, thereby contributing to environmental conservation and energy savings. Among the different TES technologies, latent heat thermal energy storage (LHTES) has gained attention due to its ability to store and release large amounts of energy through phase change materials (PCMs).
The necessity of effective thermal management in electronic devices has become increasingly critical due to the tendency to develop thinner devices and increase their power density, which has led to significant challenges in dissipating excess heat. Overheating can severely affect electronic components’ performance, reliability, and lifespan. Current cooling technologies, such as passive heat sinks and active cooling systems, are often limited by size, weight, and energy consumption.
This doctoral thesis aims to develop novel solid-solid phase change materials (SS-PCMs) based on layered hybrid organic-inorganic perovskites (LHOIPs) for use in electronic devices. The implementation of these materials has the potential to significantly reduce heat peaks and thereby improve the efficiency and lifetime of electronic devices. This dissertation is presented as a collection of publications consisting of five papers that have been published or submitted to prestigious scientific journals. Each scientific publication includes relevant details of the outputs obtained from the synthesis to the characterisation of the selected SS-PCMs.
The thesis begins by outlining the energy storage (ES) and TES technologies, followed by a thorough analysis of the state-of-the-art of SS-PCMs focused on LHOIPs. The introduction concludes with an overview of existing technologies for managing thermal energy in electronic devices. This leads to the core of the thesis, starting with the evaluation of the synthesis of the bis(alkylammonium) tetrahalometallates.
In the first part of the thesis, the synthesis mechanism of the bis(alkylammonium) tetrahalometallates was investigated and optimised specifically for TES applications. This study established a new synthesis protocol, which significantly reduced the required time and the waste generated during the process. Additionally, the use of mechanical energy through ball milling was explored. Through this process, the synthesis was accelerated and optimised while enhancing the overall sustainability and opening the door to scaling up the process.
Following the synthesis evaluation, the characteristics of selected bis(alkylammonium) tetrahalometallates were analysed, and their tailoring properties were investigated. The research findings demonstrated that SS-PCMs can be customised for specific applications by modifying the length of the carbon chain. The results indicated that the core mechanism of the polymorphic transitions resides in the reorganisations of the organic chain. This outcome led to the final section of the investigation, where the
movement of the organic chain was evaluated. Various reordering mechanisms of the organic chains during phase transitions were proposed.
The present PhD thesis shows the potential of bis(alkylammonium) tetrahalometallates as alternative SS- PCMs. The optimisation and sustainability of the materials synthesis have been addressed, as well as the understanding of the polymorphic mechanism.
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SALGADO PIZARRO, Rebeca. Synthesis and Optimisation of Layered Hybrid Organic-Inorganic Perovskites as Solid-State Thermal Energy Storage Materials. [consulta: 26 de novembre de 2025]. [Disponible a: https://hdl.handle.net/2445/217223]