Phase change materials (PCMs) are a class of materials that undergo reversible phase changes under the action of heat and can store and release large amounts of latent heat within a certain temperature range. PCMs, as the core of the phase change thermal storage technology, have excellent energy storage capacity, small temperature changes during the storage and release process, high energy utilization efficiency, and can be used in solar energy storage. However, PCMs themselves have low thermal conductivity, weak visible light absorption, solid-liquid phase change leakage and other problems, which cannot directly store solar energy and limit their applications. It has been found that the introduction of photothermal materials into PCMs can give ordinary PCMs photothermal conversion performance to meet specific requirements such as photothermal conversion in extreme environments, bringing some new potential to the field of PCMs. Photothermal composite phase change materials (CPCMs) demonstrate potential applications across diverse domains including catalysis, energy conversion, drug delivery, shape memory, and solar power generation through their abilities to leverage solar energy for thermal energy storage. A comprehensive overview of CPCMs for solar-thermal conversion and applications is lacking. Here, we comprehensively review the mechanism, classification, and recent applications of CPCMs for solar-thermal conversion and their multifunctional applications, and also highlight the bottlenecks in their current stage of development and further prospects.
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