Network Structural CNTs Penetrate Porous Carbon Support for Phase‐Change Materials with Enhanced Electro‐Thermal Performance

Abstract

Electro‐thermal phase‐change materials (PCMs) enable continuous operation of heating‐related processes, which is urgently required for modern thermal‐management devices. Driven by the unmet needs to develop promising electro‐thermal PCMs with low operation voltage and high electro‐thermal storage efficiency simultaneously, unique ZIF@MOF‐derived carbon‐nanotube (CNT)‐penetrated porous carbon supports for electro‐thermal PCMs are introduced. The network structure of the support decreases the resistivity of the composite and ensures a low operation voltage. Furthermore, abundant CNT cores in porous carbon shells facilitate interfacial interaction between the PCMs and the support and realize a rapid heat transformation. It is noted that low thermal conductive porous carbon shells prevent convective heat dissipation at the CNT‐air interface to a great degree which leads to enhanced electro‐thermal storage efficiency. Consequently, the obtained electro‐thermal PCMs exhibit a low operation voltage of 1.1 V and a record‐high electro‐thermal storage efficiency of 94.5%, which shows great potential in thermal management of electronic devices.

Phase Change Materials for Electro-Thermal Conversion and Storage: From Fundamental Understanding to Engineering Design

“…Our group (Li et al, 2020a) fabricated CNTs@porous carbon-based electrothermal PCMs through a gradient carbonization of zeolitic imidazolate framework@metal-organic frameworks (ZIF@MOFs) (Figure 14E). During the carbonization process, MOFs shells were decomposed to form porous carbon (PC) shells.…”

“…Generally, a small amount of carbon materials can form a conductive percolation network to enhance the conductivity of PCMs. In addition to the aforementioned conductive additives, some advanced conductive materials have recently emerged in the field of electro-thermal conversion PCMs, such as boron nitride (BN) (Yang et al, 2020), MXene (Lu et al, 2019), and MOFs-derived carbon (Li et al, 2020a). However, electrothermal composite PCMs-based BN, MXene, and MOFs-derived carbon are very rare, which need more exploration and research in the future.…”

Intrinsically Breathable and Flexible NO2 Gas Sensors Produced by Laser Direct Writing of Self-Assembled Block Copolymers

“…Meanwhile, block copolymer (BCP) self-assembly has been explored to construct hierarchically porous nanoscale structures, 8 which finds extensive applications in electrochemical sensors, [9][10][11][12] energy storage, [13][14][15] and electrothermal conversion. 16,17 As a result, coupling bottomup BCP self-assembly with top-down laser direct writing represents high interest to rapidly produce the hierarchically porous materials. 18 The porous 3D structures with pore sizes easily modulated by the mass ratio of BCP to resins have been explored for microfluidics, 19 microbatteries, 20,21 and supercapacitors.…”

Magnetically tightened form-stable phase change materials with modular assembly and geometric conformality features

“…The 3D structural substances act as not only the thermal conductivity promoter but also supporting materials, which signi cantly decreases the ller loading of PCMs. Among these substances, 3D carbon materials and metal foams are the most frequently used additives 18,19,20 .…”