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Related Concept Videos

Phase Changes01:19

Phase Changes

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Phase transitions play an important theoretical and practical role in the study of heat flow. In melting or fusion, a solid turns into a liquid; the opposite process is freezing. In evaporation, a liquid turns into a gas; the opposite process is condensation.
A substance melts or freezes at a temperature called its melting point and boils or condenses at its boiling point. These temperatures depend on pressure. High pressure favors the denser form of the substance, so typically, high pressure...
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Modulating Photons and Phonons in Graphene-Based Phase Change Materials for Solar-Thermal-Electrical Generation.

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  • 1School of Materials Design and Engineering, Beijing Institute of Fashion Technology, Beijing, China.

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Summary

This study developed advanced phase change materials (PCMs) for solar energy conversion. The new composite PCMs achieve high solar-thermal efficiency and stable electricity generation, enhancing solar power systems.

Keywords:
graphenemetal‐organic frameworksphase change materialssolar‐thermal conversionsolar‐thermal‐electrical generation

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Area of Science:

  • Materials Science
  • Renewable Energy Engineering
  • Nanotechnology

Background:

  • Solar-thermal-electrical generators are promising for solar energy conversion.
  • Conventional phase change materials (PCMs) have limitations in thermal conductivity and solar capture.
  • Integrating PCMs can improve generator reliability by buffering thermal fluctuations.

Purpose of the Study:

  • To develop novel composite PCMs with enhanced solar-thermal conversion and energy storage capabilities.
  • To improve the performance and stability of solar-thermal-electrical generators.
  • To explore the integration of these advanced PCMs into thermoelectric modules for power generation.

Main Methods:

  • Fabrication of photosensitive Co/C-anchored reduced graphene oxide (rGO) conductive framework using MOF pyrolysis-assisted zinc volatilization.
  • Encapsulation of paraffin wax (PW) within the rGO@Co/C framework to create composite PCMs.
  • Characterization of solar-thermal conversion efficiency, thermal conductivity, phase change enthalpy, and cycling stability.
  • Integration of the composite PCMs into a thermoelectric module for power output assessment.

Main Results:

  • The rGO@Co/C-PW composite PCMs achieved a solar-thermal conversion efficiency of 92.5% under 100 mW·cm⁻² irradiation.
  • Enhanced thermal conductivity, high phase change enthalpy, and excellent long-term cycling stability were observed.
  • The composite PCMs demonstrated regulated non-isothermal phase transition kinetics.
  • Integration into a thermoelectric module generated a sustained power output of 8.82 mW under 100 mW·cm⁻².

Conclusions:

  • The developed rGO@Co/C-PW composite PCMs effectively integrate solar-thermal conversion, thermal energy storage, and thermoelectric output.
  • The synergistic effects of graphitic carbon and cobalt nanoparticles are crucial for high solar-thermal efficiency.
  • This research offers a pathway for next-generation PCMs for efficient solar energy utilization and power generation.