Dielectric ceramics with outstanding energy-storage performances are nowadays in great demand for pulsed power electronic systems. Here, we propose a synergistic design strategy to significantly enhance the energy-storage properties of (1 - x)(0.94Na0.5Bi0.5TiO3-0.06BaTiO3)-xCaTi0.75Ta0.2O3 solid solution ceramics through introducing polar nanoregions, shifting rhombohedral to tetragonal phase transition below room temperature (stable antiferroelectric characteristic), as well as increasing the band gap in the system. Ultrahigh energy-storage properties with a record value of recoverable energy-storage density Wrec ∼ 9.55 J/cm3 and a high efficiency η ∼ 88% are achieved in Na0.5Bi0.5TiO3-based bulk ceramics with x = 0.24. Moreover, high Wrec (>3.4 J/cm3) and η (>90%) with a variation of less than 6% can be observed in a wide frequency and temperature frequency range of 5-200 Hz and 25-140 °C. Our research result not only indicates the great possibility of Na0.5Bi0.5TiO3-based lead-free compositions to replace lead-based energy-storage ceramics but also gives an effective strategy to design ultrahigh energy-storage performances for eco-friendly ceramics.

Ultrahigh Energy-Storage Performances in Lead-free Na0.5Bi0.5TiO3-Based Relaxor Antiferroelectric Ceramics through a Synergistic Design Strategy.

Skillfully grafted C O functional group to enhance the adsorption/photocatalytic mechanism of YMnO3/MgAl2O4 heterojunction photocatalysts

Dielectric capacitors have received growing interest for application in advanced electrical and electronic systems. However, the low energy density and poor thermal stability at high temperature severely hinder their practical applications. Herein, novel relaxor ferroelectric 0.4((Bi0.5Na0.5)TiO3)-0.6(0.87BaTiO3-0.13Bi(Zn2/3(Nb0.85Ta0.15)1/3)O3) (0.4BNT-0.6BTBZNT) multilayer ceramic capacitors (MLCCs) with low-cost 70 Ag/30 Pd inner electrodes were prepared via composite strategy design. The 0.4BNT-0.6BTBZNT dielectric materials combine the complementary advantages of both BNT and BTBZNT and enable a great improvement of the maximum dielectric constant and stable temperature range of the dielectric constant, leading to higher energy density and better thermal stability. Therefore, an ultrahigh discharge energy density (Ud) of 14.49 J cm−3 and an energy efficiency (η) of 84.9% have been obtained. Moreover, the MLCCs possess a good thermal stability with Ud variations of 85% from 25 to 170 °C, and an excellent cycling stability with minimal Ud variations <±3.3% (5.49 ± 0.18 J cm−3) after 100k charge–discharge cycles. Overall, the 0.4BNT-0.6BTBZNT MLCCs are highly promising and significant for practical commercial high energy storage applications, and the composite strategy design can play an effective role in designing high energy storage performance and high thermal stability dielectric capacitors for power electronic and pulse power applications.

Ultrahigh energy density with excellent thermal stability in lead-free multilayer ceramic capacitors via composite strategy design

Although relaxor ferroelectrics have been widely investigated owing to their various advantages, there are still impediments to boosting their energy-storage density (Wrec) and energy-storage efficiency (η). In this paper, we propose a cooperative optimization strategy for achieving comprehensive outstanding energy-storage performance in (Na0.5Bi0.5)0.7Sr0.3TiO3 (NBST)-based ceramics by triggering a nonergodic-to-ergodic transformation and optimizing the forming process. The first step of substituting NaNbO3 (NN) for NBST generated an ergodic state and induced polar nanoregions under the guidance of a phase-field simulation. The second step was to apply a viscous polymer process (VPP) to the 0.85NBST-0.15NN ceramics, which reduced porosity and increased compactness, resulting in a significant polarization difference and high breakdown strength. Consequently, 0.85NBST-0.15NN-VPP ceramics optimized by this cooperative two-step strategy possessed improved energy-storage characteristics (Wrec = 7.6 J/cm3, η = 90%) under 410 kV/cm as well as reliable temperature adaptability within a range of 20-120 °C, outperforming most reported (Na0.5Bi0.5) TiO3-based ceramics. The improved energy-storage performance validates the developed ceramics' practical applicability as well as the advantages of implementing a cooperative optimization technique to fabricate similar high-performance dielectric ceramics.

Enhanced Energy Storage Properties in Lead-Free (Na0.5Bi0.5)0.7Sr0.3TiO3-Based Relaxor Ferroelectric Ceramics through a Cooperative Optimization Strategy.

Ferroelectric-based photodetector has attracted much attention due to the suitable bandgap and unrestricted photovoltage. However, the low photocurrent, responsivity, and detectivity are still a big challenge. Herein, the BiFeO3/XTiO3 (X=Sr,...

Self-powered flexible UV-visible photodetector with high photosensitivity based on BiFeO3/XTiO3 (Sr, Zn, Pb) multilayer films

Large photocurrent density in polycrystalline hexagonal YMnO3 thin film induced by ferroelectric polarization and the positive driving effect of grain boundary

Stable photovoltaic output and optically tunable resistive switching in all-inorganic flexible ferroelectric thin film with self-polarization characteristic

Efficient Ultraviolet-Visible-Near Infrared Self-Powered Photodetector Based on Hexagonal YMnO3-Based Ferroelectric Thin Film by Multiscale Polarity Structure Optimization

Influence of different anionic polysaccharide coating on the properties and delivery performance of nanoliposomes for quercetin.

An unacceptable bitter taste limits the application of luteolin in healthier food systems. In this study, a bitterness-masking assessment was performed on whey protein isolate-coated liposomes loaded with luteolin (WPI-coated liposomes) using an electronic tongue and human sensory test. The physical properties of the WPI-coated colloidal nanocarrier were characterized by zeta potential, average diameter, distribution, and morphology analyses. The results indicated that WPI-coated nanocarrier systems exhibited a uniformly dispersed distribution and spherical morphology. After the comparison of the bitterness value, the bitterness-reducing effect of 5% WPI-coated liposomes was the most significant and reduced the bitterness of luteolin by 75%. Raman spectroscopy and X-ray diffraction analysis demonstrated that the decoration of WPI on the liposomes reduced the free motion of lipid molecules. This promoted the ordering at the polar headgroup area and hydrophobic core of the lipid bilayer, which explained why luteolin-loaded liposomes (uncoated liposomes) and WPI-coated liposomes could reduce the bitterness of luteolin from the perspective of bitter molecular groups. Combined with the Raman spectral data, the bilayer rigidity of 5% WPI-coated liposomes was positively responsive to the stabilization of uncoated liposomes against storage and resistance ability against surfactants. It was proven that the emergence of the surface modification of the WPI coating enhanced the stability of uncoated liposomes. These results may contribute to the use of WPI-coated liposomes as prospective candidates for effective delivery of the bioactive bitter substance in nutraceuticals and functional foods.

Mengwei Tian

Papers

Large photocurrent density in polycrystalline hexagonal YMnO3 thin film induced by ferroelectric polarization and the positive driving effect of grain boundary

Stable photovoltaic output and optically tunable resistive switching in all-inorganic flexible ferroelectric thin film with self-polarization characteristic

Efficient Ultraviolet-Visible-Near Infrared Self-Powered Photodetector Based on Hexagonal YMnO3-Based Ferroelectric Thin Film by Multiscale Polarity Structure Optimization

Influence of different anionic polysaccharide coating on the properties and delivery performance of nanoliposomes for quercetin.

Bitterness-masking assessment of luteolin encapsulated in whey protein isolate-coated liposomes.