Magnetically accelerated thermal energy storage within Fe_(3)O_(4)-anchored MXene-based phase change materials

Inherent weak photon-capturing ability is a long-standing bottleneck for pristine phase change materials(PCMs)in photothermal conversion application.To conquer this difficulty,herein,magnetic Fe_(3)O_(4) nanoparticles were in situ anchored between the layers and the surface of two-dimensional MXene for the infiltration of myristic acid(MA)by an in situ chemical anchoring strategy.Benefiting from the synergistic localized surface plasmon resonance effect of MXene and Fe_(3)O_(4) nanoparticles,our designed MXene@Fe_(3)O_(4)-MA composite PCMs harvested an ultrahigh photothermal conversion efficiency of 97.7%.During the photothermal conversion process,MXene can capture photons and convert solar energy into heat energy efficiently,and the in situ anchored Fe_(3)O_(4) nanoparticles further enhanced the photothermal conversion efficiency.Moreover,the introduction of Fe_(3)O_(4) nanoparticles improved the thermal energy storage density(144.17 J/g)of MXene-MA composite PCMs since Fe_(3)O_(4) nanoparticles provided more heterogeneous nucleation sites for MA.Simultaneously,MXene@Fe_(3)O_(4)-MA composite PCMs were endowed with excellent paramagnetism,and realized efficient magnetic-thermal conversion.Additionally,MXene@Fe_(3)O_(4)-MA composite PCMs exhibited excellent energy conversion stability,thermal stability,and reliability after undergoing multiple thermal cycles.Therefore,high-performance MXene@Fe_(3)O_(4)-based energy conversion composite PCMs are promising candidates to accelerate efficient utilization of the practical solar energy and magnetic energy.