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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.
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The internal energy of a substance—the total kinetic energy of all its molecules and the potential energy of their associated forces—depends on the strength of the intermolecular forces in the condensed phases and the pressure exerted on the substance. The internal energy of a substance is the highest in the gaseous state, the lowest in the solid state, and intermediate in the liquid state. Phase transitions are caused by changes in physical conditions, such as temperature and...
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MXene-Integrated Solid-Solid Phase Change Composites for Accelerating Solar-Thermal Energy Storage and Electric

Ali Usman1, Mulin Qin1, Feng Xiong1

  • 1Beijing Key Laboratory for Theory and Technology of Advanced Battery Materials, School of Materials Science and Engineering, Peking University, Beijing, 100871, P. R. China.

Small Methods
|February 7, 2024
PubMed
Summary

This study introduces MXene-integrated solid-solid phase change materials (PCMs) for efficient solar energy storage. The novel composite achieves high solar-thermal energy storage efficiency and capacity, overcoming traditional PCM limitations.

Keywords:
LSPR effectinterfacial interactionssolar‐thermal conversion and electric conversionsolid‐solid PCMs

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Area of Science:

  • Materials Science
  • Energy Storage
  • Nanotechnology

Background:

  • Phase Change Materials (PCMs) offer high thermal storage density for solar energy applications.
  • Traditional PCMs face challenges like leakage, poor solar-thermal conversion, and low thermal conductivity, limiting efficiency.
  • Developing advanced PCMs is crucial for effective solar energy utilization.

Purpose of the Study:

  • To present a novel MXene-integrated solid-solid phase change material (M-SSPCM) system for efficient solar-thermal energy storage and electric conversion.
  • To enhance the performance of PCMs by leveraging MXene's photothermal properties and PCM's phase transformation characteristics.
  • To demonstrate a proof-of-concept device for solar-thermal-electric energy conversion using the developed M-SSPCMs.

Main Methods:

  • Fabrication of MXene-integrated solid-solid phase change material composites.
  • Characterization of the composite system's solar-thermal energy storage efficiency, capacity, and thermal conductivity.
  • Evaluation of thermal cycling stability and performance in a proof-of-concept solar-thermal-electric conversion device.

Main Results:

  • The optimal M-SSPCM composite achieved a solar thermal energy storage efficiency of up to 94.5%.
  • The composite demonstrated an enhanced energy storage capacity of 149.5 J g⁻¹ even at a low 5 wt.% MXene doping level.
  • Improved thermal conductivity, high thermal cycling stability, and excellent energy conversion efficiency in a thermoelectric device were observed.

Conclusions:

  • MXene-integrated solid-solid PCMs offer a promising solution for high-efficiency solar energy storage and conversion.
  • The developed composite system overcomes limitations of traditional PCMs, enabling advanced photothermal systems.
  • This research highlights the potential of M-SSPCMs for efficient solar energy utilization.