Anisotropically conductive Mg(NO3)2·6H2O/g-C3N4-graphite sheet phase change material for enhanced photo-thermal storage

Zhang, Wenbo; Ling, Ziye; Fang, Xiaoming; Zhang, Zhengguo

doi:10.1016/j.cej.2021.132997

Cited by 28 publications

(9 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Many semiconductors, such as CuS and MoS 2 , mainly realize solar-thermal conversion through a nonradiative relaxation effect. ,− When semiconductors are illuminated by light with energy larger than the bandgap, the electrons at a lower energy level (valence band) will be excited and transit to a higher energy level (conduction band), creating a large number of electron–hole pairs. The excited electrons will return to the valence band and all or part of the energy is dissipated in the form of radiation energy such as fluorescence and phosphorescence or in the form of thermal energy, causing radiative relaxation and nonradiative relaxation, respectively.…”

Section: Mechanismsmentioning

confidence: 99%

Phase Change Thermal Storage Materials for Interdisciplinary Applications

et al. 2023

View full text Add to dashboard Cite

Functional phase change materials (PCMs) capable of reversibly storing and releasing tremendous thermal energy during the isothermal phase change process have recently received tremendous attention in interdisciplinary applications. The smart integration of PCMs with functional supporting materials enables multiple cutting-edge interdisciplinary applications, including optical, electrical, magnetic, acoustic, medical, mechanical, and catalytic disciplines etc. Herein, we systematically discuss thermal storage mechanism, thermal transfer mechanism, and energy conversion mechanism, and summarize the state-of-the-art advances in interdisciplinary applications of PCMs. In particular, the applications of PCMs in acoustic, mechanical, and catalytic disciplines are still in their infancy. Simultaneously, in-depth insights into the correlations between microscopic structures and thermophysical properties of composite PCMs are revealed. Finally, current challenges and future prospects are also highlighted according to the up-to-date interdisciplinary applications of PCMs. This review aims to arouse broad research interest in the interdisciplinary community and provide constructive references for exploring next generation advanced multifunctional PCMs for interdisciplinary applications, thereby facilitating their major breakthroughs in both fundamental researches and commercial applications.

show abstract

Section: Mechanismsmentioning

confidence: 99%

Phase Change Thermal Storage Materials for Interdisciplinary Applications

et al. 2023

View full text Add to dashboard Cite

show abstract

“…Solar energy, as the most inexhaustible, renewable, and clean energy resource, has drawn widespread concerns in recent decades due to growing depletion of fossil energy and deteriorating environmental pollution. − Solar-thermal conversion, where solar irradiation is captured and converted to thermal directly, is considered the most fascinating approach to exploit solar energy because of its superior energy conversion efficiency, straightforward operation, and cost effectiveness. , However, broad application of solar-thermal utilization is severely limited by the intermittency and volatility nature of solar irradiation. − Phase-change materials (PCMs) are efficient thermal storage materials that can spontaneously absorb and release plentiful latent heat with little temperature alteration through phase transitions. − Incorporating PCMs into the solar-thermal utilization system is regarded as one of the most prospective approaches to overcome the intermittency of solar irradiation and improve solar-thermal utilization efficiency. − Among numerous PCMs, n -alkanes are recognized as the most advisable PCMs on account of their superior properties, such as superior energy storage capacity, excellent chemical stability, suitable operating temperature, and noncorrosiveness. − Nevertheless, the application prospect of n -alkanes for efficient thermal storage is extremely restricted due to their leakage issues of molten liquid during solid–liquid phase transformation. , …”

Section: Introductionmentioning

confidence: 99%

Flame-Retardant and Form-Stable Phase-Change Composites Based on Phytic Acid/ZnO-Decorated Surface-Carbonized Delignified Wood with Superior Solar-Thermal Conversion Efficiency and Improved Thermal Conductivity

Yue

Wang

et al. 2023

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

In order to efficiently exploit solar-thermal energy, it is essential to develop form-stable phase-change material (PCM) composites simultaneously with superior solar-thermal storage efficiency, excellent flame retardancy, and improved thermal conductivity. Herein, phytic acid (PA)-modified, zinc oxide-deposited, and surface-carbonized delignified woods (PZCDWs) were constructed by alkaline boiling, PA modification, ZnO deposition, and surface carbonization. Then, novel form-stable PCMs (PZPCMs) with superior solar-thermal storage efficiency, excellent flame retardancy, and improved thermal conductivity were fabricated by impregnating n-docosane into PZCDWs under vacuum. The PZCDW aerogels can well support the n-docosane and overcome liquid leakage owing to their superior surface tension and strong capillary force. Differential scanning calorimetry results showed that PZPCMs possessed superior n-docosane encapsulation yield and high phase-change enthalpy (185.2–213.1 J/g). Decorating delignified wood by surface carbonization and ZnO deposition significantly improved the solar-thermal conversion efficiency (up to 86.2%) and thermal conductivity (193.3% increased) of PCM composites. Furthermore, with the introduction of PA into PZPCMs, the peak heat release rate and total heat release of the PCM composites decreased considerably, indicating the enhanced flame retardancy of PZPCMs. In conclusion, the novel renewable wood-based PCM composites demonstrate promising potential in solar energy harnessing and thermal modulation technologies.

show abstract

“…The low thermal conductivity of TRIS impedes the efficient storage of heat generated by the photothermal conversion surface within the PCMs, resulting in significant parasitic heat loss from the photothermal conversion surface to the ambient. 13 Hence, the need to enhance its thermal conductivity is crucial. The prevalent approach involves incorporating high thermal conductivity particles, such as Al2O3, 14 Cu, 15 MWCNTs, 16 and graphene, 17 among others, into the PCM.…”

Section: Introductionmentioning

confidence: 99%

“…Li et al 28 found that by introducing 25% expanded graphite into pentaerythritol, the thermal conductivity and electrical conductivity of the phase change material reached 33.5 W/(m•K) and 323 S/cm, respectively. Zhang et al 13 utilized a cold-pressed multilayer strategy to fabricate multilayer composite phase change materials comprising expanded graphite and Mg(NO 3 ) 2 • 6H 2 O, which demonstrated a high oriented thermal conductivity of 15.70 W/(m•K). Li et al 29 reported a dual- encapsulation strategy to fabricate PEG@PU-RGNPs composites with a 30% filling rate of expanded graphite, which achieved a high thermal conductivity of 27.0 W/(m•K) and showed potential for effective thermal management of batteries.…”

Section: Introductionmentioning

confidence: 99%

Oriented High Thermal Conductivity Solid–Solid Phase Change Materials for Mid-Temperature Solar-Thermal Energy Storage

Dai

Gao

Wang

et al. 2023

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

As the global energy crisis intensifies, the development of solar energy has become a vital area of focus for many nations. The utilization of phase change materials (PCMs) for photothermal energy storage in the medium temperature range holds great potential for various applications, but their conventional forms face several challenges. For instance, the longitudinal thermal conductivity of photothermal PCMs is inadequate for effective heat storage on the photothermal conversion surface, and there is a risk of leakage due to repeated solid–liquid phase transitions. Here, we report a solid–solid phase change material, tris(hydroxymethyl)aminomethane (TRIS), which has a phase change temperature of 132 °C in the medium temperature range, enabling high-grade and stable solar energy storage. To overcome the low thermal conductivity problem, we propose a large-scale production of oriented high thermal conductivity composites by compressing a mixture of TRIS and expanded graphite (EG) using the pressure induction method to create in-plane highly thermally conductive channels. Remarkably, the resulting phase change composites (PCCs) exhibit a directional thermal conductivity of 21.3 W/(m·K). Furthermore, the high phase change temperature (132 °C) and large phase change entropy (213.47 J/g) enable a large-capacity high-grade thermal energy to be used. The developed PCCs, when combined with selected photo-absorbers, exhibit efficient integration of solar-thermal conversion and storage. Additionally, we also demonstrated a solar-thermoelectric generator device with an energy output of 93.1 W/m2, which is close to the power of photovoltaic systems. Overall, this work provides a technological route to the large-scale fabrication of mid-temperature solar energy storage materials with high thermal conductivity, high phase change enthalpy, and no risk of leakage, and also offers a potential alternative to photovoltaic technology.

show abstract

Anisotropically conductive Mg(NO3)2·6H2O/g-C3N4-graphite sheet phase change material for enhanced photo-thermal storage

Cited by 28 publications

References 29 publications

Phase Change Thermal Storage Materials for Interdisciplinary Applications

Phase Change Thermal Storage Materials for Interdisciplinary Applications

Flame-Retardant and Form-Stable Phase-Change Composites Based on Phytic Acid/ZnO-Decorated Surface-Carbonized Delignified Wood with Superior Solar-Thermal Conversion Efficiency and Improved Thermal Conductivity

Oriented High Thermal Conductivity Solid–Solid Phase Change Materials for Mid-Temperature Solar-Thermal Energy Storage

Contact Info

Product

Resources

About