Nanoflake-Constructed Supramolecular Hierarchical Porous Microspheres for Fire-Safety and Highly Efficient Thermal Energy Storage

Abstract

The leakage and fire hazard of organic solid–liquid phase change material (PCM) tremendously limit its long-term and safe application in thermal energy storage and regulation. In this work, novel nanoflake-fabricated organic–inorganic supramolecular hierarchical microspheres denoted as BPL were synthesized through the electrostatically driven assembly of poly­(ethylene ammonium phenylphosphamide) (BP) decorated layered double hydroxides using sodium dodecyl sulfate as a template. Then the BPL was simultaneously utilized as a porous supporting material and flame retardant for polyethylene glycol to fabricate shape-stabilized PCM (BS-PCM). Benefiting from the structural uniqueness of the BPL microsphere, the BS-PCM possessed a high latent heat capacity of 116.7 J g–1 and excellent thermoregulatory capability. Moreover, the BS-PCM had no apparent leakage after a 200-cycle heating/cooling process and showed excellent thermal reversibility, superior to similar solid–liquid PCMs reported in recent literature. More interestingly, unlike flammable PEG, BS-PCM showed excellent fire resistance when exposed to a fire source. The unique BPL porous microsphere provided not only a microcontainer with high storage capacity for solid–liquid PCM, but also a fire resistant barrier to PEG, supplying a promising solution for highly efficient and fire-safe thermal energy storage.

Intelligently Thermoresponsive Ionic Liquid toward Molecular Firefighting and Thermal Energy Management

“…The O 1s spectra illustrate that the peaks of P–O (531.1 eV), P–O–C (532.4 eV), and P–O (532.9 eV) for [DP]­[MI] and [DP]­[TEA] shift to lower binding energy than those of DP, which should be due to the generation of ion (P–O δ− M δ+ ) (Figure S3c). In Figure S3d, the peaks located at 134.5 and 133.8 eV for [DP]­[MI] and [DP]­[TEA] can be assigned to the PO and P–O δ− M δ+ bonding, respectively . All results indicate DP, [DP]­[MI], and [DP]­[TEA] were synthesized successfully.…”

“…Latent heat storage based on phase change materials (PCMs), as one of the efficient technologies for the utilization of energy, has been actively pursued to relieve energy crisis and increasing pollution caused by fossil fuels. , Among them, organic PCMs possess several typical advantages, such as high-energy storage density, no phase segregation, constant phase transition temperature, and small volume change in phase change process, so they are ideal candidate materials for thermal energy storage. − However, large-scale application of organic PCMs is restricted by their intrinsic drawbacks such as highly volatile and flammable features. , …”

“…3−5 However, large-scale application of organic PCMs is restricted by their intrinsic drawbacks such as highly volatile and flammable features. 6,7 To overcome the above defect of organic PCMs in fire hazard, adding flame retardants to PCMs to enhance the fire safety is an effective method. In a previous work, 8 palmitic acid (PA)/melamine/silicon dioxide (SiO 2 ) composites with flame retardancy were prepared using a sol−gel method.…”

Flame‐Retardant PEDOT:PSS/LDHs/Leather Flexible Strain Sensor for Human Motion Detection

“…LDHs can be produced via different methods, including co-precipitation, [28][29][30] hydrothermal, [31,32] calcination-reconstruction, [33,34] ion exchange, [35] and template methods. [36] Hydrothermal method was selected to prepare LDHs in this work because the produced LDHs had high crystallinity and narrow particle size distribution. [37,38] The structural and morphology characterizations of prepared MgAl-LDHs and MgAlV-LDHs were conducted by using XRD and SEM, respectively.…”

Model-driven development of durable and scalable thermal energy storage materials for buildings

“…The goal of the study is to accelerate ss-PCM development for durable TES in building envelopes by considering the detailed phase change properties of PCMs. Among the current solid-liquid PCM compounds, such as organic polyethylene glycols (PEG), paraffin, and fatty acids as well as inorganic hydrated salts [20], we selected PEG as the PCM candidate because it is environmentally benign and exhibits less phase segregation [21]. PEGs with a molecular weight (MW) of 1,000, 800, and 600 g/mol-which are less-studied PCMs for TES for buildings (especially the latter two) -are utilized for fabricating ss-PCMs by fine-tuning the transition temperature suitable for building envelope applications.…”