JOURNAL OF ALLOYS AND COMPOUNDS
·
2016
·
IF 3.014
Longwen Wu,Xiaohui Wang,Longtu Li
Core-shell BaTiO 3 @BiScO 3 (BT@BS) particles were fabricated via a facile sol-precipitation method, with which bulk ceramics were prepared via conventional sintering. Pure perovskite phases of the BT@BS ceramics were confirmed by XRD patterns. Grain sizes and DC conductivities of the BT@BS ceramics are suppressed in comparison with pure BT. Dielectric-temperature measurements show that with the addition of BS, the tetragonal-orthorhombic and orthorhombic-rhombohedral peaks sequentially disappear with gradual broadening and dispersion of Curie peaks. Wide and flat dielectric-temperature plateau is achieved in the ceramic with 3 mol% BS coatings, which is due to the formation of local compositionally graded structure from the modulated diffusion of Bi and Sc. Weakened polarization nonlinearity and reduced hysteresis are achieved in the BT@BS ceramics, which contribute to enhanced energy storage capability. This work provides a generic avenue for fabricating temperature-stabilized dielectrics with improved energy storage density.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2015
·
IF 4.772
Yanyan Fan,Xingyi Huang,Guanyao Wang,Pingkai Jiang
Flexible high-dielectric-constant (high-κ) nanocomposite dielectrics comprising polymer matrix and ceramic nanoparticles have important applications in the fields of electrical insulation and energy storage. However, most of the flexible high-κ nanocomposites are fabricated by using nonbiodegradable polymers as matrixes, which may not meet the increasing demands of society for environmental sustainability. In this study, using biodegradable polylactic acid (PLA) as a matrix and core–shell structured BaTiO3 (BT) nanoparticles as high-κ filler, we report the preparation and structure–property relationship of environmentally friendly flexible high-κ polymer nanocomposites. Two types of core–shell structured high-κ nanoparticles [polydopamine-encapsulated BT (BT@PDA) and PLA-encapsulated BT@PDA (BT@PDA@PLA)] as well as as-prepared BT nanoparticles were used as filler of the PLA-based high-κ nanocomposites. It was found that, compared with the as-prepared BT nanocomposites, the core–shell nanoparticle-based composites show enhanced dielectric constant, suppressed dielectric loss tangent, and enhanced breakdown strength. In addition, the BT@PDA@PLA nanocomposites have much higher dielectric constant and energy density. The nanoparticle–PLA compatibility and its influence on the dielectric and energy storage properties of the nanocomposites were also investigated. Because the polymer matrix is environmentally friendly and the preparation process of the core–shell nanoparticles is facile and nontoxic, the nanocomposites reported here may be used in the next generation of environmentally friendly high-performance energy storage devices.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
RENEWABLE ENERGY
·
2021
·
IF 8.001
Huanmei Yuan,Hao Bai,Hao Chen,Zefei Zhang,Haifei An,Weijian Tian
Phase change micro/nanocapsules with high thermal conductivity shells have extensive application prospects in solar energy storage systems and electronics cooling. To improve the heat transfer of the capsules, a method of preparing Ag-shell coated phase change micro/nanocapsules was developed, where the AgBr ultrafine solid particles are introduced to enhance the rigidity of emulsion droplets in the liquid-solid phase transition process, and by employing hydroquinone as the reductant to repeatedly reduce the AgBr that had been adhered to the surface of the emulsion droplets, an Ag shell is formed on the surface of the cores. In this work, palmitic acid (PA) is used as the core material, and the prepared PA/Ag nanocapsules (100–600 nm) exhibit high thermal storage capability and good thermal reliability. The bulk thermal conductivity of the nanocapsules can be as high as 4.072 W/(m·K), indicating that the Ag shell can effectively improve the thermal conductivity of the nanocapsules. Besides, the thermal response of the nanocapsules is estimated by simulating a single-particle heat transfer process considering nanoscale effects , and the results demonstrate that the thermal response time of PA/Ag nanocapsule (350 nm) in working fluid (water, 80 °C) could be as short as 150ns.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2017
·Vol. 9
·期 11
·596
·
IF 3.364
Zejun Pu,Xiaoyi Zheng,Yuhan Tian,Linqing Hu,Jiachun Zhong
In this report, flexible cross-linked polyarylene ether nitrile/functionalized barium titanate(CPEN/F-BaTiO3) dielectrics films with high permittivitywere prepared and characterized. The effects of both the F-BaTiO3and matrix curing on the mechanical, thermal and dielectric properties of the CPEN/F-BaTiO3dielectric films were investigated in detail. Compared to pristine BaTiO3, the surface modified BaTiO3particles effectively improved their dispersibility and interfacial adhesion in the polymer matrix. Moreover, the introduction of F-BaTiO3particles enhanced dielectric properties of the composites, with a relatively high permittivity of 15.2 and a quite low loss tangent of 0.022 (1 kHz) when particle contents of 40 wt % were utilized. In addition, the cyano (–CN) groups of functional layer also can serve as potential sites for cross-linking with polyarylene ether nitrile terminated phthalonitrile (PEN-Ph) matrix and make it transform from thermoplastic to thermosetting. Comparing with the pure PEN-ph film, the latter results indicated that the formation of cross-linked network in the polymer-based system resulted in increased tensile strength by ~67%, improved glass transition temperature (Tg) by ~190 °C. More importantly, the CPEN/F-BaTiO3composite films filled with 30 wt % F-BaTiO3particles showed greater energy density by nearly 190% when compared to pure CPEN film. These findings enable broader applications of PEN-based composites in high-performance electronics and energy storage devices materials used at high temperature.Keywords:polyarylene ether nitrile;surface functionalization;cross-linking;dielectric properties;energy storage capacity
研究领域:
材料科学
·
电气工程
·
高分子科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Polymers
·
2022
·Vol. 14
·期 23
·5161
·
IF 4.967
Jiawei Wang,Zihua Wu,Huaqing Xie,Tingting Wang,Yuanyuan Wang,Yueming Huang,Lan Dong
A series of polyurethane/graphene oxide (PU/GO) solid–solid phase change materials (SSPCMs) were synthesized by using GO as a light-absorbing filler and polyethylene glycol (PEG) as a phase change matrix. The effects of PEG content on the energy storage capacity, thermal stability and photo–thermal conversion performance of PU were investigated. The results show that the form-stability of PU/GO decreases while the phase change enthalpy and photo–thermal conversion efficiency of PU/GO increases with the increasing PEG content. The introduction of a very low content of GO can maintain comparable energy storage density and greatly improve light absorption by reasonably modulating the soft segment contents. The PU/GO composite with 92 wt% PEG has a phase change enthalpy of 138.12 J/g and a high photo–thermal conversion efficiency (87.6%). The composite solid–solid PCMs have great potential for effective energy storage and solar energy utilization.Keywords:photo–thermal conversion polyurethane;different soft segment content;energy storage capacity;shape-stabilized
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Today Communications
·
2024
·
IF 3.7
Zemin Zhou,Ming Li,Yu Hu,Zhipeng Chen
Employing a photoanode with energy self-storage capability is crucial to provide continuous photocathodic protection (PCP) for metal under intermittent irradiation. In this work, NiO, a hole collector, was coupled with WO 3 /BiVO 4 to improve photoelectrochemical properties and photocathodic protection ability for stainless steel (316 SS). The optimal WO 3 /BiVO 4 /NiO photoanode (WB2N2) exhibited 35.1% and 26.6% increase in energy storage capacity compared with WO 3 and WO 3 /BiVO 4 under illumination, respectively. The open-circuit potential (OCP) of 316SS coupled with irradiated WB2N2 was reduced from −143 mV (uncoupled OCP) to −726 mV, and the electrode potential can maintain at −540 mV after light was turned off. It was calculated that electrons of about 1.286×10 −2 C was transferred from WB2N2 to 316 SS after 50 s illumination, which was 11.7 and 5.1 times of that WO 3 and WB2 passed to 316SS, respectively, confirming the best persistent PCP performance of WB2N2 in the absence of light. The positive role of NiO on the PCP and persistent PCP performance was analyzed. The long-term OCP test and XRD analysis proved the stability of WO 3 /BiVO 4 /NiO in PCP performance and chemical composition .
研究领域:
材料科学
·
电化学
·
腐蚀科学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Guanyao Wang,Xingyi Huang,Pingkai Jiang
Rapid evolution of energy storage devices expedites the development of high-energy-density materials with excellent flexibility and easy processing. The search for such materials has triggered the development of high-dielectric-constant (high-k) polymer nanocomposites. However, the enhancement of k usually suffers from sharp reduction of breakdown strength, which is detrimental to substantial increase of energy storage capability. Herein, the combination of bio-inspired fluoro-polydopamine functionalized BaTiO3 nanowires (NWs) and a fluoropolymer matrix offers a new thought to prepare polymer nanocomposites. The elaborate functionalization of BaTiO3 NWs with fluoro-polydopamine has guaranteed both the increase of k and the maintenance of breakdown strength, resulting in significantly enhanced energy storage capability. The nanocomposite with 5 vol % functionalized BaTiO3 NWs discharges an ultrahigh energy density of 12.87 J cm–3 at a relatively low electric field of 480 MV m–1, more than three and a half times that of biaxial-oriented polypropylene (BOPP, 3.56 J cm–3 at 600 MV m–1). This superior energy storage capability seems to rival or exceed some reported advanced nanoceramics-based materials at 500 MV m–1. This new strategy permits insights into the construction of polymer nanocomposites with high energy storage capability.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
IONICS
·
2020
·Vol. 27
·期 1
·305-314
·
IF 2.394
He Yi,Liu Lijuan,Tao Shihan,Ye Jing,Wu Jun,Xu Cuiying,Guo Qiaohui
NiCo 2 S 4 nanostructures have been intensively investigated as supercapacitor electrode materials ascribing to its high conductivity and capacity. However, NiCo 2 S 4 -based electrodes suffer inferior cycling durability owing to its structural degradation during the redox process. Herein, NiCo 2 S 4 nanoneedles anchored on the graphitic carbon nanofiber mat (NiCo 2 S 4 /GCN) are synthesized via a two-pot hydrothermal method. The NiCo 2 S 4 /GCN composed of highly conductive graphitic carbon nanofiber (GCN) frameworks ensures the uniform dispersion of NiCo 2 S 4 and accelerate electron/ion transport, and NiCo 2 S 4 with porous and hollow nanostructure facilitates the diffusion of electrolyte. The NiCo 2 S 4 /GCN electrode reveals a high-energy storage capability (1775.2 F g −1 at 10 A g −1 ) and an amazing rate retention (1510.2 F g −1 at 50 A g −1 ). Furthermore, the NiCo 2 S 4 /GCN//active carbon device displays a superior energy density (52.3 W h kg −1 at 358.0 W kg −1 ) and preeminent cycle life (retention 94.7% after 10,000 cycles at 5 A g −1 ), suggesting a promising candidate in supercapacitor applications.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
ECS Journal of Solid State Science and Technology
·
2023
·Vol. 12
·期 4
·043009
·
IF 2.2
Hui Liu,Shuangcui Li,Lili Ma,Meng Xin,Xin Wen
Bronnitride nanosheets (BNNS) have attracted considerable interest in preparing high energy density (Ue) polymer nanocomposites due to its intrinsic high breakdown strength and thermal conductivity. However, efficient fabrication of BNNSs remains a challenge due to the low yield and complex fabrication process, which limits their further wide applications in polymer-based dielectrics. In this study, effectively stripped thin layer BNNS were prepared with high yield by urea-assisted ball milling combined with ultrasonic thermal stripping. The results showed that BNNS not only achieved efficient stripping and good dispersion in liquid solutions, but also effectively increased the energy storage capacity of the PVDF-based composites, with the highest Ue (7.5 J cm−3 at 450 MV m−1) achieved in 8 wt% BNNS/PVDF composites.
研究领域:
材料科学
·
电气工程
✓ 已验证
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2018
·Vol. 20
·期 7
·5001-5011
·
IF 3.906
Liwei Wang,Xingyi Huang,Yingke Zhu,Pingkai Jiang
Introducing a high dielectric constant (high-k) nanofiller into a dielectric polymer is the most common way to achieve flexible nanocomposites for electrostatic energy storage devices. However, the significant decrease of breakdown strength and large increase of dielectric loss has long been known as the bottleneck restricting the enhancement of practical energy storage capability of the nanocomposites. In this study, by introducing ultra-small platinum (<2 nm) nanoparticles, high-k polymer nanocomposites with high breakdown strength and low dielectric loss were prepared successfully. Core–shell structured polydopamine@BaTiO3 (PDA@BT) and core–satellite ultra-small platinum decorated PDA@BT (Pt@PDA@BT) were used as nanofillers. Compared with PDA@BT nanocomposites, the maximum discharged energy density of the Pt@PDA@BT nanocomposites is increased by nearly 70% because of the improved energy storage efficiency. This research provides a simple, promising and unique way to enhance energy storage capability of high-k polymer nanocomposites.
研究领域:
材料科学
·
电气工程
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
THERMOCHIMICA ACTA
·
2017
·
IF 2.236
Xia Gao,Tianbo Zhao,Guan Luo,Baohui Zheng,Hui Huang,Xue Han,Yuqiao Chai
A facile method was developed for encapsulating paraffin wax with St-DVB-SiO 2 organic−inorganic hybrid shells through the combination of suspension emulsion polymerization and hydrolysis and condensation reaction. In this work, the influence of TEOS/MPS mass ratios on the morphology, particle size distribution (PSD), content of core materials, latent heat storage capacity, thermal conductivity and stability of these microcapsules has been studied. SEM and PSD analysis showed that the fabricated microcapsules had a bowl-like shape with concaves on the shell. Moreover, SEM and TGA results jointly illustrated that the higher amount of MPS incorporated into the experimental process, the more SiO 2 particles bonded on the shell of microcapsules. DSC measurements revealed that the microcapsules had a melting temperature range of 44.36–55.03 °C and latent heat storage capacities of 38.90–95.67 J/g. It was suggested that microencapsulated paraffin wax with St-DVB-SiO 2 hybrid shells has been synthesized successfully.
研究领域:
材料科学
·
化学工程
·
热能存储
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 14
·8097-8103
·
IF 3.119
Wenbin Wang,Huimin Cao,Jingyi Liu,Shifang Jia,Lin Ma,Xi Guo,Weisheng Sun
Phase change energy storage wood (PCESW) was prepared by using microencapsulated phase change materials (MicroPCM) as thermal energy storage (TES) materials and wood as the matrix. The incorporation of MicroPCM and wood was realized using a vacuum impregnation method. The morphology and microstructure of MicroPCM, delignified wood (DLW) and PCESW were observed by scanning electron microscopy (SEM); the thermal properties including phase change temperature, enthalpy, thermal stability, thermal conductivity of MicroPCM and PCESW were characterized by differential scanning calorimetry (DSC), thermogravimetric analysis (TG) and laser flash analysis (LFA). The results showed that: (1) delignification improved the porosity of wood and enhanced the impregnation effect, MicroPCM got into the delignified wood successfully and mainly distributed in the vessels; (2) PCESW had excellent energy storage capacity and suitable phase transition temperature for regulating indoor temperature; (3) PCESW had prior thermal stability at room temperature and great durability after 100 heating–cooling cycles; (4) addition of graphene greatly improved the thermal conductivity of PCESW. The TES composite can be used as an indoor temperature regulating material for building energy conservation.
研究领域:
材料科学
·
热能工程
·
建筑科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）