ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Jiajun Ma,Donghai Zhang,Fei Ying,Xiongjie Li,Ling Li,Shun Guo,Yu Huan,Ji Zhang,Jing Wang,Shan-Tao Zhang
Dielectric capacitors have attracted growing attention because of their important applications in advanced high power and/or pulsed power electronic devices. Nevertheless, the synergistic enhancement of recoverable energy storage density (Wrec > 10 J/cm3) and efficiency (η > 80%) is still a great challenge for lead-free dielectric bulk ceramics. Herein, by introducing complex perovskite compound (Bi0.9Na0.1)(Fe0.8Ti0.2)O3 with a smaller tolerance factor into an NaNbO3 matrix (NN-BNFT), we have achieved and explored stable relaxor antiferroelectric ceramics with enhanced relaxor behavior. Of particular importance is the composition of 0.88NN-0.12BNFT, which exhibits a large electric breakdown strength Eb of 87.3 kV/mm, an ultrahigh Wrec of 12.7 J/cm3, and a high efficiency η of 82.5%, as well as excellent thermal reliability and an ultrafast discharge speed, resulting from the dense microstructure, the moderate dielectric constant, the reduced grain size, the dielectric loss, and the sample thickness. The outstanding energy storage properties of NN-BNFT display great promise in advanced dielectric capacitors for energy storage applications.
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Small Methods
·
2021
·Vol. 5
·期 11
·2100787
·
IF 14.188
Rui Huang,Hongye Wang,Cheng Tao,Minghe Cao,Hua Hao,Zhonghua Yao,Hanxing Liu
Dielectric film capacitors are considered as potential candidates for advanced power electronics technology due to their extremely high-power densities and outstanding mechanical and thermal stability, but the further improvement of energy storage density is still needed. Here, a strategy is proposed to enhance the energy storage properties by introducing nanoscale polarization regions into amorphous films, which can significantly improve the maximum polarization and maintain a high breakdown strength. The (1− x )BaTiO 3 - x Bi(Ni 0.5 Zr 0.5 )O 3 ((1− x )BT- x BNZ) thin films are fabricated by the sol–gel method and the amorphous films with nanoscale polarization regions are obtained by adjusting the preparation process. Consistent with the conjecture, amorphous phase and nanoscale polarization regions in the (1− x )BT- x BNZ films are clearly observed by electron diffraction. Results show that giant recoverable energy density of 103.7 J cm −3 with high energy efficiency of 88.3% are simultaneously achieved at 8.3 MV cm −1 in 0.92BT-0.08BNZ thin films. Furthermore, the 0.92BT-0.08BNZ thin film exhibits excellent thermal stability in a wide temperature range of 20–200 °C, ∆ W rec / W rec20 °C < 2.2%. This work provides a novel method for dielectric thin film capacitors applied in high temperature and electric field.
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Haochen Sun,Yingzhi Meng,Feifei Han,Silin Tang,Xiuyun Lei,Qingqing Ke,Dingyuan Wang,Yisong Bai,Biaolin Peng,Xue Chen,Xiang Niu,Shengguo Lu,Laijun Liu
Electrocaloric refrigeration technology has garnered significant attention due to its potential for next-generation solid-state cooling, which is miniaturized and efficient. However, achieving a substantial electrocaloric effect (ECE) and a wide working temperature range at low electric fields remains a challenge. In this study, a synergistic approach combining domain and defect engineering was used in transparent 0.88 Pb(Mg 1/3 Nb 2/3 )O 3 -0.12PbTiO 3 - x Sm(0.88PMN-0.12 PT- x Sm) ceramics to improve ECE and temperature stability. Finally, a notable adiabatic temperature change ( ΔT ) of 2.07 K in the x = 0.01 ceramic, with ΔT exceeding 1.0 K across a broad temperature range from 30 to 180 °C was achieved. Piezoresponse force microscopy (PFM) and X-ray photoelectron spectroscopy revealed the presence of small domains and appropriate oxygen vacancies as contributors to the enhanced ECE and broad operation temperature range. This work introduces a promising candidate material for electrocaloric refrigeration.
研究领域:
材料科学
·
物理学
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Journal of Water Process Engineering
·
2024
·
IF 6.3
Feng Liu,Huanhuan Zhang,Nian Liu,Junxia Wang,Maolin Chen,Feiyue Qian
Wafer surface treatment is a crucial step in the integrated circuit packaging process, which would generate high-strength organic wastewater using propylene glycol monomethyl ether (PGME) as a photoresistor thinner. This study investigated the performance of Fenton oxidation and catalytic ozonation (O 3 /H 2 O 2 /FeOOH) for removing refractory organics in wafer surface treatment wastewater by optimizing operation and combining utilizations. Gas chromatography–mass spectrometry was employed to analyze intermediates composition in the effluents treated by various advanced oxidation processes , and the toxicity of organics was predicted using the Quantitative Structure-Activity Relationship tool. Fenton oxidation outperformed O 3 /H 2 O 2 /FeOOH in the removal efficiencies of chemical oxygen demand (COD) and PGME, but produced 9.60 kg·m −3 of chemical sludge . Additionally, 3-hydroxy- N -phenylaniline, an acutely toxic compound, was dominant in the intermediates of Fenton oxidation, indicating the ecological risks of chemical sludge. O 3 /H 2 O 2 /FeOOH followed by Fenton oxidation (O 3 /H 2 O 2 /FeOOH + Fenton) exhibited higher total organic carbon removal (77.7 %) with less chemical sludge production (8.47 kg·m −3 ) than the reverse combination (Fenton + O 3 /H 2 O 2 /FeOOH). Although the intermediates of aniline, ketone, and ester exhibited considerable acute and developmental toxicity , the significant improvement in biodegradability of the effluents (BOD 5 /COD ratio of 0.36 > 0.02 for raw wastewater) favored subsequent biological treatment. These findings provide guidance for the cost-effective treatment of wafer surface treatment through rational designing combined processes.
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PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
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2025
·
IF 7.8
Yanting Dong,Qiang Wang,Jie Yang,Nanwen Zhu
Sulfadiazine (SDZ), a type of antibiotics with refractory and high-mobile characteristics, can accumulate and be detected out in aquatic ecosystems all over the world. SDZ can be destroyed by ozonation, but the degradation effect is easily and negatively affected by carbonate ions (CO 3 2- ) which be eliminated by introduction of Ca 2+ in ozonation systems. Experimental results manifested that the maximum removal rate of 100 % and 94.15 % corresponding to SDZ and chemical oxygen demand (COD) were achieved under the optimum Ca(OH) 2 addition without pH adjustment. In addition, the presence of Cl - and humic acid inhibited the SDZ degradation to some extent. It could be found that Ca 2+ and OH - jointly played great roles in increased oxidation of ozonation. For one thing, quenching effect of CO 3 2- on •OH was eliminated through combination of Ca 2+ and CO 3 2- and low molecular intermediate forming insoluble precipitates. For another, OH - caused alkaline condition which was instrumental in existence of •OH. Moreover, successive addition of Ca(OH) 2 was proposed and proved to be feasible to elevate the •OH generation and oxidizing ability in O 3 /Ca(OH) 2 system. Ultimately, the three potential degradation pathways of SDZ were speculated basing on density function theory (DFT) calculations and identification of several intermediate products. Overall, this study provided promising insights for promotion of antibiotics removal and ozonation efficiency by alleviating the inhibitory effect of carbonate ions in aqueous environment.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2025
·
IF 9.7
Miaoyan Song,Lin Xu,Kemeng Wang,Guohu Chen,Zhaohong Tang,Kaiwen Zhou,Wenwei Wu,Xuehang Wu
O3-type NaNi 1/3 Fe 1/3 Mn 1/3 O 2 (NFM) is considered as a promising cathode material for sodium-ion batteries (SIBs) due to its high theoretical energy density and low production cost. However, the applications of NFM are restricted owing to detrimental interfacial side reactions and phase evolution during cycling. Herein, a three-in-one modification strategy, including Na 2 MoO 4 coating, surface reconstruction from layered to spinel phase, and Mo 6+ doping, is proposed to design NFM. A uniform and tight Na 2 MoO 4 coating layer formed via reactive wetting mechanism can effectively inhibit the unfavorable side reactions between cathode and electrolyte. The formation of nanoscale spinel layer can anchor the interior layered structure, leading to a decrease in volume change during the sodiation/desodiation process. The incorporation of Mo 6+ with a high valence state and strong Mo O bonds into the O3 phase promotes the expansion of transition-metal layer spacing and enhances the structural stability. As a result, tri-modified NFM exhibits superior cycling stability with a capacity retention of 85.20 % after 300 cycles at 100 mA g −1 and rate performance with a discharge capacity of 56.9 mAh/g at 2000 mA g −1 , outperforming those of pristine NFM (61.76 % and 39.4 mAh/g). This synergistic modification approach provides a new avenue to improve the performance of layered-oxide cathode materials for SIBs.
研究领域:
材料科学
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电化学
·
储能
·
电池技术
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
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IF 5.8
Wenxu Wang,Yue Sun,Pengcong Wen,Yueqiang Zhou,Dongyun Zhang,Chengkang Chang
This study presents a novel modification strategy involving the replacement of Mn with Sc in the cathode of NaNi 1/3 Fe 1/3 Mn 1/3 O 2 (NFM). The results of this study confirmed that Sc doping introduced strong Sc–O bonds to enhance the bonding between transition metal ions and O 2− . Additionally, Sc doping reduced the proportion Mn 3+ in the material (from 50.23% to 47.46%), thereby inhibiting the material structural distortion due to the Jahn–Teller effect induced by Mn 3+ . These factors were the main contributors to the improved cycling performance of the modified material. Furthermore, the introduction of Sc decreased the band gap of the material (1.7416–1.6706 eV) and the Na + activation barrier energy (0.773–0.732 eV). These changes not noly facilitated the de-embedding of Na + in the material lattice but also significantly enhanced the material electronic conductivity, leading to an excellent rate performance of the modified material. These results indicate that the NFM-Sc0.01 sample maintained an ultra-high capacity retention of 86.45% after 200 cycles at 1 C. At 5 C, the discharge capacity of NFM-Sc0.01 significantly increased from 79.3 mAh g −1 in NFM to 93.4 mAh g −1 , demonstrating great potential for industrialized applications.
研究领域:
材料科学
·
电化学
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CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Yingquan Chen,Rui Li,Yan Zhang,Yanping Long,Na Liu,Haijun Xia,Xiong Luo,Bin Meng
A series of lead-free perovskite-structured high-entropy dielectric ceramics with a composition of (La 0.25 Sr 0.25 Ba 0.25 Na 0.25 )(Ti 0.5 Me 0.5 )O 3 (Me = Sn, Zr, Hf) were designed by doping at both the A and B sites. Specifically, these ceramics were prepared via a solid-state reaction method combined with conventional sintering at 1500 ° C for 10 h. All high-entropy ceramics were consisted of a perovskite-structured single solid solution with an average grain size of 2.78–3.85 μm. Of the three samples, (La 0.25 Sr 0.25 Ba 0.25 Na 0.25 )(Ti 0.5 Sn 0.5 )O 3 exhibited the highest dielectric constant, which remained stable from in 25–312 ° C. All three groups of high-entropy ceramics showed typical relaxor behaviour. The discharge energy density ( W d = 0.31 J/cm 3 ), energy storage efficiency ( η = 90.88%) and breakdown strength ( BDS = 300 kV/cm) of (La 0.25 Sr 0.25 Ba 0.25 Na 0.25 )(Ti 0.5 Sn 0.5 )O 3 were much higher than those of BaTiO 3 ( W d = 0.08 J/cm 3 , η = 46.09%, BDS = 30 kV/cm) and other reported lead-free dielectric ceramics. These results demonstrate that high-entropy (La 0.25 Sr 0.25 Ba 0.25 Na 0.25 )(Ti 0.5 Me 0.5 )O 3 ceramics are promising new candidates for high-performance, lead-free dielectric ceramics.
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Ceramics-Switzerland
·
2024
·Vol. 7
·期 1
·426-435
·
IF 2.7
Yuan-Bin Chen,Yu Fan,Shiuan-Ho Chang,Shaobing Shen
In this study, we used solid-state synthesis to prepare Ba[(ZnxCo1−x)1/3(Nb0.5Ta0.5)2/3]O3microwave ceramics for mobile communications. Compared with Ba[Zn1/3(Nb0.5Ta0.5)2/3]O3, in the prepared materials, Co2+substitution with Zn2+improved the Q × f value and enabled densification and sintering at a lower temperature. We used X-ray diffraction (XRD) and scanning electron microscopy (SEM) to analyze the obtained microstructure. Ba[(ZnxCo1−x)1/3(Nb0.5Ta0.5)2/3]O3was found to have a 1:2 ordered hexagonal structure, and its Q × f value increased with the increase in sintering temperature. In this work, excellent microwave dielectric properties—τf= −0.7 ppm/°C, εr= 34.5, and Q × f = 110,000 GHz—were obtained by sintering Ba[(Zn0.3Co0.7)1/3(Nb0.5Ta0.5)2/3]O3at 1400 °C for 5 h.
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JOURNAL OF POWER SOURCES
·
2024
·
IF 8.1
Fang-Ze Han,Yu-Fei Wan,Cheng-Xin Li,Shan-Lin Zhang
The development of solid-oxide cells requires fuel electrodes capable of promoting highly catalytic activities for CO 2 electrochemical reduction (CO 2 R). This study develops a fuel electrode material, Sr(Ti 0·3 Fe 0·63 Ru 0.07 ) O 3-δ (STFR) perovskite, enhance with in-situ exsolved Fe–Ru nanoparticles (STFR–FeRu), demonstrating excellent electrochemical catalytic activity for CO 2 R, considerable stability, and high selectivity for CO 2 electrolysis. Notably, the study discovered for the first time that STFR–FeRu exhibits significantly enhanced catalytic activity in a CO 2 -containing atmosphere compares to that in hydrogen-based fuels. At 800 °C and 1.3 V, La 0·8 Sr 0.2 Ga 0.8 Mg 0·2 O 3-δ electrolyte-supported cells with STFR–FeRu fuel electrode, for direct CO 2 electrolysis, realizes a current density of 1.77 A cm −2 . This current density is 50 % higher than that of H 2 O electrolysis under the same conditions. Additionally, the cell achieves a current density of 1.54 A cm −2 for CO 2 –H 2 O co-electrolysis, with a high CO 2 electrolysis selectivity (CO concentration exceeding 60 % in the electrolysis products).
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