Developing advanced nanocomposite integrating solar-driven thermal energy storage and thermal management functional microwave absorption can facilitate the cutting-edge application of phase change materials(PCMs).To c...Developing advanced nanocomposite integrating solar-driven thermal energy storage and thermal management functional microwave absorption can facilitate the cutting-edge application of phase change materials(PCMs).To conquer this goal,herein,two-dimensional MoS_(2) nanosheets are grown in situ on the surface of one-dimensional CNTs to prepare core-sheath MoS_(2)@CNTs for the encapsulation of paraffin wax(PW).Benefiting from the synergistic enhancement photothermal effect of MoS_(2) and CNTs,MoS_(2)@CNTs is capable of efficiently trapping photons and quickly transporting phonons,thus yielding a high solar-thermal energy conversion and storage efficiency of 94.97%.Meanwhile,PW/MoS_(2)@CNTs composite PCMs exhibit a high phase change enthalpy of 101.60 J/g and excellent lo ng-term thermal storage durability after undergoing multiple heating-cooling cycles.More attractively,PW/MoS_(2)@CNTs composite PCMs realize thermal management functional microwave absorption in heat-related electronic application scenarios,which is superior to the single microwave absorption of traditional materials.The minimum reflection loss(RL) for PW/MoS_(2)@CNTs is-28 dB at 12.91 GHz with a 2.0 mm thickness.This functional integration design provides some insightful references on developing advanced microwave absorbing composite PCMs,holding great potential towards high-efficiency solar energy utilization and thermally managed microwave absorption fields.展开更多
Neither pristine phase change materials(PCMs)nor metal-organic frame-works(MOFs)can be driven by optical/electrical/magnetic triggers for multiple energy conversion and thermal storage,which cannot satisfy the require...Neither pristine phase change materials(PCMs)nor metal-organic frame-works(MOFs)can be driven by optical/electrical/magnetic triggers for multiple energy conversion and thermal storage,which cannot satisfy the requirements of multi-scenario applications.Herein,a three-dimensional interconnected forest-type array carbon network anchored by Co nanoparticles serving as optical/electrical/magnetic multimode triggers was developed through in situ growth of two-dimensional MOF nanosheet arrays on pre-carbonized melamine foam and subsequent high-temperature carbonization.After the encapsulation of polyethylene glycol,the resulting composite PCMs simultaneously integrate fascinating photothermal,electrothermal,magnetothermal conversion and stor-age for personal thermotherapy.Benefiting from the synergistic enhancement of forest-type array carbon heterostructure and Co nanoparticles,composite PCMs exhibit high thermal/electrical conduction and strong full-spectrum absorption capacities.Resultantly,low-energy photoelectric triggers are sufficient to drive high-efficiency photothermal/electrothermal conversion and storage of compos-ite PCMs(93.1%,100 mW/cm^(2);92.9%,2.5 V).Additionally,composite PCMs also exhibit excellent encapsulation stability without liquid phase leakage,long-term thermal reliability and multiple energy conversion and storage stability after multiple cycles.The proposed photoelectromagnetic multimode triggers are aimed to inspire innovation and accelerate major breakthroughs in advanced responsive composite PCMs toward multiple energy utilization and personal thermotherapy.展开更多
In response to the rapid development of highly integrated multifunctional electronic devices,developing advanced multifunctional composite phase change materials(PCMs)that integrate thermal management,solar-thermal co...In response to the rapid development of highly integrated multifunctional electronic devices,developing advanced multifunctional composite phase change materials(PCMs)that integrate thermal management,solar-thermal conversion and microwave absorption has become increasingly essential.Herein,we propose a bionical strategy to design neural network-like(carbon nanofiber)CNF@Co/C aerogels by growing ZIF-67 in situ on bacterial cellulose(BC)and subsequent calcination strategies.After the encapsulation of thermal storage unit(paraffin wax,PW),the obtained multifunctional composite PCMs(PW-CNF@Co/C aerogel)are composed of“soma”(Co/C polyhedra),“axon”(porous CNF)and thermal storage unit(PW).Importantly,the composite PCMs show a high solar-thermal conversion efficiency of 95.27%benefiting from the synergism of“soma”with strong local surface plasmon resonance(LSPR)effect and“axon”with enhanced photon transmission path.More attractively,the composite PCMs also display good microwave absorption capacity with a minimum reflection loss(RL)of-26.8 dB at 10.91 GHz owing to the synergy of magnetic and dielectric components along with abundant polarization and multiple reflections.Our developed functionally integrated composite PCMs provide a prospective application of highly integrated and miniaturized electronic devices in complex and changeable outdoor environments.展开更多
Advanced multifunctional composite phase change materials(PCMs)for integrating energy storage,photothermal conversion and microwave absorption can promote the development of next-generation miniaturized electronic dev...Advanced multifunctional composite phase change materials(PCMs)for integrating energy storage,photothermal conversion and microwave absorption can promote the development of next-generation miniaturized electronic devices.Here,we report paraffin wax(PW)-based multifunctional composite PCMs with a hierarchical network structure assembled by two‐dimensional(2D)nickel-based metal-organic frameworks(Ni-MOFs)decorated carbon nanotubes(CNTs).The PW/CNTs@Ni-MOF composite PCMs yield an excellent photothermal energy conversion efficiency of 93.2%,as well as a good phase change enthalpy of 126.5 J/g and prominent thermal stability.Preferably,the composite PCMs also present great microwave absorption with-25.32 dB minimum reflection loss(RLmin)at 9.85 GHz.The remarkable features of the composite PCMs lie in their hierarchical network architecture and the synergistic enhancement of CNTs and MOFs,giving rise to the increased surface area,accelerated photon capture and transmission,and enhanced dielectric loss caused by polarization effects and multiple reflections,thus further boosting the latent energy storage capacity,photothermal kinetics,and microwave reflection loss.This work provides a facile and scalable approach to regulating the multifunction of composite PCMs.展开更多
基金supported by the National Natural Science Foundation of China (51902025)China Postdoctoral Science Foundation (2020T130060 and 2019M660520)。
文摘Developing advanced nanocomposite integrating solar-driven thermal energy storage and thermal management functional microwave absorption can facilitate the cutting-edge application of phase change materials(PCMs).To conquer this goal,herein,two-dimensional MoS_(2) nanosheets are grown in situ on the surface of one-dimensional CNTs to prepare core-sheath MoS_(2)@CNTs for the encapsulation of paraffin wax(PW).Benefiting from the synergistic enhancement photothermal effect of MoS_(2) and CNTs,MoS_(2)@CNTs is capable of efficiently trapping photons and quickly transporting phonons,thus yielding a high solar-thermal energy conversion and storage efficiency of 94.97%.Meanwhile,PW/MoS_(2)@CNTs composite PCMs exhibit a high phase change enthalpy of 101.60 J/g and excellent lo ng-term thermal storage durability after undergoing multiple heating-cooling cycles.More attractively,PW/MoS_(2)@CNTs composite PCMs realize thermal management functional microwave absorption in heat-related electronic application scenarios,which is superior to the single microwave absorption of traditional materials.The minimum reflection loss(RL) for PW/MoS_(2)@CNTs is-28 dB at 12.91 GHz with a 2.0 mm thickness.This functional integration design provides some insightful references on developing advanced microwave absorbing composite PCMs,holding great potential towards high-efficiency solar energy utilization and thermally managed microwave absorption fields.
基金National Natural Science Foundation of China,Grant/Award Number:51902025。
文摘Neither pristine phase change materials(PCMs)nor metal-organic frame-works(MOFs)can be driven by optical/electrical/magnetic triggers for multiple energy conversion and thermal storage,which cannot satisfy the requirements of multi-scenario applications.Herein,a three-dimensional interconnected forest-type array carbon network anchored by Co nanoparticles serving as optical/electrical/magnetic multimode triggers was developed through in situ growth of two-dimensional MOF nanosheet arrays on pre-carbonized melamine foam and subsequent high-temperature carbonization.After the encapsulation of polyethylene glycol,the resulting composite PCMs simultaneously integrate fascinating photothermal,electrothermal,magnetothermal conversion and stor-age for personal thermotherapy.Benefiting from the synergistic enhancement of forest-type array carbon heterostructure and Co nanoparticles,composite PCMs exhibit high thermal/electrical conduction and strong full-spectrum absorption capacities.Resultantly,low-energy photoelectric triggers are sufficient to drive high-efficiency photothermal/electrothermal conversion and storage of compos-ite PCMs(93.1%,100 mW/cm^(2);92.9%,2.5 V).Additionally,composite PCMs also exhibit excellent encapsulation stability without liquid phase leakage,long-term thermal reliability and multiple energy conversion and storage stability after multiple cycles.The proposed photoelectromagnetic multimode triggers are aimed to inspire innovation and accelerate major breakthroughs in advanced responsive composite PCMs toward multiple energy utilization and personal thermotherapy.
基金supported by the National Natural Science Foundation of China(No.51902025).
文摘In response to the rapid development of highly integrated multifunctional electronic devices,developing advanced multifunctional composite phase change materials(PCMs)that integrate thermal management,solar-thermal conversion and microwave absorption has become increasingly essential.Herein,we propose a bionical strategy to design neural network-like(carbon nanofiber)CNF@Co/C aerogels by growing ZIF-67 in situ on bacterial cellulose(BC)and subsequent calcination strategies.After the encapsulation of thermal storage unit(paraffin wax,PW),the obtained multifunctional composite PCMs(PW-CNF@Co/C aerogel)are composed of“soma”(Co/C polyhedra),“axon”(porous CNF)and thermal storage unit(PW).Importantly,the composite PCMs show a high solar-thermal conversion efficiency of 95.27%benefiting from the synergism of“soma”with strong local surface plasmon resonance(LSPR)effect and“axon”with enhanced photon transmission path.More attractively,the composite PCMs also display good microwave absorption capacity with a minimum reflection loss(RL)of-26.8 dB at 10.91 GHz owing to the synergy of magnetic and dielectric components along with abundant polarization and multiple reflections.Our developed functionally integrated composite PCMs provide a prospective application of highly integrated and miniaturized electronic devices in complex and changeable outdoor environments.
基金supported by the Beijing Natural Science Foundation(No.2232053)the National Natural Science Foundation of China(No.52002029)+1 种基金Natural Science Foundation of Guangdong Province(No.2022A1515011918)Scientific and Technological Innovation Foundation of Shunde Graduate School,University of Science and Technology Beijing(No.BK20AE003).
文摘Advanced multifunctional composite phase change materials(PCMs)for integrating energy storage,photothermal conversion and microwave absorption can promote the development of next-generation miniaturized electronic devices.Here,we report paraffin wax(PW)-based multifunctional composite PCMs with a hierarchical network structure assembled by two‐dimensional(2D)nickel-based metal-organic frameworks(Ni-MOFs)decorated carbon nanotubes(CNTs).The PW/CNTs@Ni-MOF composite PCMs yield an excellent photothermal energy conversion efficiency of 93.2%,as well as a good phase change enthalpy of 126.5 J/g and prominent thermal stability.Preferably,the composite PCMs also present great microwave absorption with-25.32 dB minimum reflection loss(RLmin)at 9.85 GHz.The remarkable features of the composite PCMs lie in their hierarchical network architecture and the synergistic enhancement of CNTs and MOFs,giving rise to the increased surface area,accelerated photon capture and transmission,and enhanced dielectric loss caused by polarization effects and multiple reflections,thus further boosting the latent energy storage capacity,photothermal kinetics,and microwave reflection loss.This work provides a facile and scalable approach to regulating the multifunction of composite PCMs.