Super-flexible phase change materials with a dual-supporting effect for solar thermoelectric conversion in the ocean environment

Zhou, Yulong; Bai, Lu; Bao, Rui‐Ying; Yang, Ming‐Bo; Yang, Jie

doi:10.1039/d2ta07885f

Cited by 21 publications

(4 citation statements)

References 80 publications

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“…The developed STEGS in ice water also continuously generated output voltage and current for about 810 s without solar irradiation thanks to the latent heat release by the PEG component within the developed composite. According to the above results, the STEGS developed in this study exhibits higher output voltage and current than most of the other STEGSs reported in the literature at the same irradiation intensity as shown in Figure a ,,− ,− and Table S5 (Supporting Information). These results confirm the superior performance of the developed STEGS in solar-thermal-electric conversion and electricity generation.…”

Section: Resultssupporting

confidence: 74%

Unidirectionally Structured Magnetic Phase-Change Composite Based on Carbonized Polyimide/Kevlar Nanofiber Complex Aerogel for Boosting Solar-Thermo-Electric Energy Conversion

Shi,

Liu,

Wang

2024

ACS Appl. Mater. Interfaces

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To realize highly efficient solar-thermo-electric energy conversion for clean electricity power generation, we have developed a new type of unidirectionally structured magnetic phase-change composite comprising a carbonized polyimide (C−PI)/Kevlar nanofiber (KNF) complex aerogel as a 3D carbon skeleton porous supporting material, CoFe 2 O 4 nanoparticles as a magnetic additive, polyethylene glycol (PEG) as a phase-change material, and polypyrrole as a photothermal absorption coating layer. The as-fabricated C−PI/KNF complex aerogel exhibits a unidirectional microstructure, high porosity, robust skeleton frame, ultralight weight, and high thermal conductance. Featured with such unique structure and characteristics, the complex aerogel can offer an effective heat and electron transfer method to ensure highly efficient solarthermal conversion and photothermal energy storage of the developed composite. The developed composite exhibits a high latent heat capacity of over 150 J g −1 , outstanding shape stability along with a low leakage of 0.2 wt %, good thermal cycling stability, and high photothermal conversion efficiency of 84.8%. Based on the Seebeck effect, a solar thermoelectric generation system (STEGS) was constructed with the hot side coupled with the developed composite and the cold side immersed in air and ice water. Under 2.0 kW m −2 solar irradiation, the developed STEGS in ice water obtained maximum output voltage and current of 259.7 mV and 27.1 mA, respectively, which are significantly higher than those in air. The output power of the developed STEGS in an ice water environment is 50.6% higher than that in air under 4.0 kW m −2 solar irradiation. More importantly, the developed STEGS in ice water continuously generated output voltage and current for about 810 s without solar irradiation thanks to the latent heat release by the PEG component within the developed composite. In addition, the introduction of magnetic CoFe 2 O 4 can accelerate solar-thermal conversion through periodic electron motion by the Neél relaxation or Brownian relaxation. This resulted in an increase in the maximum output voltage and current by 13.7 and 11.5%, respectively, under an alternating magnetic field as a result of the magnetism-accelerated solar-thermo-electric conversion. This study offers an innovative approach for developing PCM-based advanced functional materials for solar energy utilization in clean and sustainable electricity generation.

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Section: Resultssupporting

confidence: 74%

Unidirectionally Structured Magnetic Phase-Change Composite Based on Carbonized Polyimide/Kevlar Nanofiber Complex Aerogel for Boosting Solar-Thermo-Electric Energy Conversion

Shi,

Liu,

Wang

2024

ACS Appl. Mater. Interfaces

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“…It is inevitable that a small amount of melt leakage still occurs on the surface of these PCMs. 51 Achieving complete leakage-proof performance of flexible PCMs remains a challenge. In this work, the obtained flexible PCMs exhibit excellent leakage resistance due to the dual-supporting effect of the elastic polyurethane (PU) shell of paraffin microcapsules and the three-dimensional NR network.…”

Section: Resultsmentioning

confidence: 99%

Flexible composite phase change materials with enhanced thermal conductivity and mechanical performance for thermal management

Li¹,

Zhou²,

Wang³

et al. 2023

J. Mater. Chem. A

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“…36,37 Preparing intrinsic flexible phase change materials typically requires the use of a large amount of toxic and harmful reagents (such as toluene), which causes environmental pollution, and the overall enthalpy of the obtained materials is not high. 38 Composite flexible PCMs are usually composed of flexible polymers as the supporting network (such as polyethylene, poly(methyl methacrylate), olefin block copolymers, etc. ), and PCMs are compounded with supporting materials by physical blending.…”

Section: Introductionmentioning

confidence: 99%

“…In this regard, flexible shape-stabilized phase change materials, which have the characteristics of flexible processability and nonleakage before and after phase change, have been paid more and more attention recently. − Flexible phase change materials (PCMs) can be mainly categorized into two types: intrinsic flexible PCMs and composite flexible PCMs. − Intrinsic flexible PCMs are formed by chemically connecting the molecular chains of PCMs with those of flexible polymers, resulting in PCMs with intrinsic flexible phase change properties. , Preparing intrinsic flexible phase change materials typically requires the use of a large amount of toxic and harmful reagents (such as toluene), which causes environmental pollution, and the overall enthalpy of the obtained materials is not high . Composite flexible PCMs are usually composed of flexible polymers as the supporting network (such as polyethylene, poly(methyl methacrylate), olefin block copolymers, etc.…”

Section: Introductionmentioning

confidence: 99%

Confined Crystallization Polyether-Based Flexible Phase Change Film for Thermal Management

Lu,

Huang,

Zhang

et al. 2024

ACS Appl. Mater. Interfaces

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Phase change materials (PCMs) possess the potential to regulate temperature by utilizing their thermal properties to absorb and release heat. Nevertheless, the application of PCMs in thermal management is constrained by issues such as liquid leakage and limited flexibility. In this study, we propose a novel approach to address these challenges by incorporating a pore structure within nanofibers to confine the crystallization of phase change molecules, thereby enhancing the flexibility of the composite material. Additionally, inspired by the adaptive mechanisms observed in plants, we have developed a form stable PCM based on polyether, which effectively mitigates the issue of liquid leakage at higher temperatures. Despite being a solid−liquid PCM at its core, this material exhibits molecular-scale flow and macroscopic shape stability as a result of intermolecular forces. The composite film material possesses remarkable flexibility, efficient thermal management capabilities, adjustable phase transition temperature, and the ability to undergo repeated processing and utilization. Consequently, it holds promising potential for applications in personal thermal energy management.

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Super-flexible phase change materials with a dual-supporting effect for solar thermoelectric conversion in the ocean environment

Abstract: Solar thermoelectric generators (STEGs) based on phase change materials (PCMs) are an emerging advanced technology to collect and utilize solar energy. However, it is still challenging for photo-driven PCMs to...

Cited by 21 publications

References 80 publications

Unidirectionally Structured Magnetic Phase-Change Composite Based on Carbonized Polyimide/Kevlar Nanofiber Complex Aerogel for Boosting Solar-Thermo-Electric Energy Conversion

Unidirectionally Structured Magnetic Phase-Change Composite Based on Carbonized Polyimide/Kevlar Nanofiber Complex Aerogel for Boosting Solar-Thermo-Electric Energy Conversion

Flexible composite phase change materials with enhanced thermal conductivity and mechanical performance for thermal management

Confined Crystallization Polyether-Based Flexible Phase Change Film for Thermal Management

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