Water
·
2022
·Vol. 14
·期 9
·1412
·
IF 3.53
Yixin Lu,Chenghan Tang,Yujie Liu,Jiao Chen
In phosphate buffer, the degradation of ATZ by ozone/(O3/H2O2) under various circumstance was explored and the degradation mechanism and dynamics were probed. The findings revealed that when maintaining the reaction temperature at 25 °C, the H2O2concentration and the O3concentration were 20 mol/L and 20 mol/L, respectively. Moreover, the degradation rate of 5 mol/L ATZ under the influence of O3/H2O2was 92.59% in phosphate buffer at pH7. The mechanism analysis showed that HO• and O3underwent co-oxidized degradation and that the HO• and O3oxidation degradation ratios were close to 1:1 under acidic conditions. Furthermore, HO• oxidative degradation dominated the ATZ degradation process. The kinetics analysis showed that the ATZ kinetics of O3/H2O2degradation were more compatible with quasi-second-order reaction kinetics under different temperatures, pH values, and H2O2concentrations.Keywords:ozone;hydrogen peroxide;atrazine;degradation mechanism;kinetics
研究领域:
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 6
·1-12
·
IF 2.8
Lin Wu,Yang Qingqing,Meng Bin,Ping Xinyu,Fang Congcong,Zhang Han,Chen Yingquan
A series of lead-free perovskite-structured dielectric ceramics of (1-x)Ba 0.6 Sr 0.4 Ti 0.7 Zr 0.3 O 3 -xBi(Li 0.5 Ta 0.5 )O 3 ((1-x)BSTZ-xBLT, x = 0, 0.10, 0.15, and 0.20) were prepared through solid-state reaction method combined with conventional sintering. Specifically, for x = 0, 0.10, 0.15, and 0.20, the samples of (1-x)BSTZ-xBLT were sintered in air for 8 h at 1500 °C, 1300 °C, 1200 °C, and 1150 °C, respectively. All samples possess a pure perovskite structure and achieve a high relative density of 93 ~ 95%. The average grain size of all samples falls within 1.74 ~ 2.67 μm, and all composition elements distribute uniformly. The addition of BLT is conducive to reduce the sintering temperature of BSTZ. The critical electric field corresponding to the saturation polarization intensity of BSTZ increases from 69.4 kV/cm to 88.9 kV/cm as x rises from 0 to 0.10. The dielectric permittivity of 0.85BSTZ-0.15BLT and 0.80BSTZ-0.20BLT keeps stable (∆ \(\varepsilon\) / \(\varepsilon\) 25 °C ≤ ± 15%) in the test temperature of − 100 ~ 350 °C. The activation energy ( \(E\) α ) of BSTZ enhances from 0.86 eV to 1.72 eV as x rises from 0 to 0.20, which contributes to the broadening of the band gap. These results suggest that (1-x)BSTZ-xBLT ceramics are promising candidates for high-temperature ceramic capacitors.
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
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yurong Wu,Haidi Yang,Mengzhao Zhu,Runguo Zheng,Zhishuang Song,Dan Wang,Yanguo Liu,Zhiyuan Wang
Sodium-ion batteries (SIBs) face a fundamental trade-off between high capacity and structural stability in layered oxide cathodes, where anion redox reactions (ARR) induce oxygen loss and irreversible phase transitions (e.g., detrimental P2-O2). To overcome this, we design a single-crystal P2/O3 biphasic high-entropy oxide cathode Na 0.67 (Fe 1/4 Co 1/4 Ni 1/4 Ti 1/4 ) 0.2 Mn 0.6 Li 0.2 O 2 (FCNTML20). This cathode design strategy integrated high-entropy TM-layer configuration for lattice stabilization, precisely controlled P2/O3 biphasic structure (95:5 ration) to suppress phase transitions, and large single-crystal morphology eliminating grain boundaries. Ex-situ XPS analysis demonstrates that Li substitution effectively enhances the redox activity of oxygen while increasing the Mn 4+ /Mn 3+ ratio, thereby mitigating the Jahn-Teller distortion induced by Mn 3+ . In-situ XRD reveals that Li substitution and configurational entropy minimize lattice variations and inhibit P2-O2 transitions in favor of a reversible P2-OP4 pathway, enabling highly reversible synergistic anion-cation redox. Consequently, FCNTML20 achieves a high specific capacity of 207.7 mAh g −1 at 0.1C and near-100 % capacity retention after 100 cycles (1.5–4.5 V ). Full cells paired with hard carbon deliver 185.2 mAh g −1 and an energy density of 491.7 Wh kg −1 . This work establishes a paradigm for high-energy SIB cathodes by concurrently stabilizing cationic/anionic redox through entropy-enhanced biphasic engineering.
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DOI
高影响因子
Nanomaterials
·
2025
·Vol. 16
·期 1
·50
·
IF 4.3
Xiumei Xu,Yi Zhou,Mengmeng Dai,Haijiao Zhang,Jing Xu,Gui Wang,Gang Yang,Yongsheng Zhu
Metal oxide semiconductor (MOS)-based chemiresistive gas sensors, attributable to their low cost, compact structure, and long operational lifetime, have been widely employed for the detection and monitoring of trace ozone (O3) in environmental air. Moreover, as ozone is a highly reactive oxidizing species extensively used in medical device sterilization, hospital disinfection, and food processing and preservation, accurate monitoring of ozone concentration is also essential in medical sanitation and food safety inspection. However, their practical applications are often limited by insufficient sensitivity and the requirement for elevated operating temperatures. In this study, Au-modified indium oxide (Au-In2O3) nanocomposite sensing materials were synthesized via a hydrothermal route followed by surface modification. Structural and morphological characterizations confirmed the uniform dispersion of Au nanoparticles on the In2O3surface, which is expected to enhance the interaction between the sensor and target gas molecules. The resulting Au-In2O3sensor exhibited excellent O3sensing performance under room-temperature conditions. Compared with pristine In2O3, the Au-In2O3sensor with 1.0 wt% Au modification demonstrated a remarkably enhanced response of 1398.4 toward 1 ppm O3at room temperature. Moreover, the corresponding response/recovery times were shortened to 102/358 s for Au-In2O3. The outstanding O3sensing performance can be attributed to the synergistic effects of Au nanoparticles, including the spillover effect and the formation of a Schottky junction at the Au-In2O3interface. These results suggest that Au-modified In2O3cauliflower represents a highly promising candidate material for high performance O3sensing at low operating temperatures.
研究领域:
材料科学
·
气体传感技术
·
纳米复合材料
·
环境监测
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2018
·
IF 4.427
Chaoqun Tan,Qinglong Xu,Haochen Zhang,Zheming Liu,Shuxin Ren,He Li
A high-efficient, eco-friendly and applicable oxidant of percarbonate (SPC, Na 2 CO 3 ·1.5H 2 O 2 ) is applied as oxidant in ozonation (O 3 ) process. In this work, coumarin (COU) decomposition by O 3 and O 3 /SPC was proposed in terms of diverse parameters, including ozone concentration, SPC dosage and pH, with regard to the pseudo-first-order kinetic model. About 96.5% of 25 mg L −1 COU was removed by 209.3 mg L −1 SPC and 2.08 mg L −1 O 3 within 30 min, whereas 49.8% of COU was exhausted in O 3 system alone. High ozone concentration and pH could enhance COU removal, and overdose SPC has an inhibition effect as CO 3 2− could react with ·OH. Furtherly, the generation of hydroxyl radicals ( OH) via a chain reaction in O 3 was ascertained based on indirect alcohols quenching tests and direct electron spin resonance (ESR) spin-trapping tests, though high initial SPC concentration led to no trapping of OH by 5,5-dimethyl-1-pyrroline-N-oxide (DMPO) in O 3 /SPC. According to the concentration of dissolved ozone and prior study, a fast reaction kinetic model was estimated firstly for O 3 /SPC system and well fitted with different condition. The hydroxylated intermediates of 7-hydroxylcoumarin and 6,7-hydroxylcoumarin were recognized and the degradation pathways were proposed. The findings of the study can broaden the research direction of SPC and provide a new application information for SPC in environmental pollution control .
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 19
·11681-11690
·
IF 10.7
Xuejiao Zhao,Lihan Zhang,Xiaoqi Wang,Jinhui Li,Lin Zhang,Di Liu,Rui Yang,Xu Jin,Manling Sui,Pengfei Yan
The high energy density and low-cost O3-layered NaNi1/3Fe1/3Mn1/3O2 (NFM) is a representative layered cathode for sodium-ion batteries (SIBs). However, its long-term cycling stability needs further improvement and its high voltage usage is highly desired, which is quite challenging. The lack of full understanding of the cycling-induced failures hinders material optimization. Herein, we utilize advanced microanalysis techniques to comprehensively investigate the failure mechanisms of the O3-NFM layered cathode upon low-voltage (2.0–4.0 V) and high-voltage (2.0–4.3 V) cycling. We found that surface degradations play a dominant role during low-voltage cycling, and bulk failures become prominent upon high-voltage cycling. Surface cracking, corrosion, and structure transition together lead to slow charge transfer kinetics, resulting in chronic capacity decay. Bulk degradations such as intragranular cracking, void formation, and interlayer cation mixing severely deteriorate Na storage performance and Na diffusion kinetics, causing rapid capacity decay and voltage fading issues, which are the main challenges of the NFM layered cathode for high voltage usage. High charging cutoff voltage activates the cation migration and condensation, causing a highly disordered layered structure but no phase transition occurs in the bulk. Synergistically stabilizing the surface and bulk structure of the high-voltage O3-layered cathode is essential for achieving superior electrochemical performance.
研究领域:
材料科学
·
电化学
·
储能
·
电池技术
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Yalin Qin,Peikun Yan,Fuxuan Han,Yongcheng Zhang,Zonglin Lv,Chunming Zhou
The enhancement of both transparency and piezoelectric properties in transparent ferroelectric ceramics is a challenge. In this work, we prepared transparent 0.75Pb(Mg 1/3 Nb 2/3 )O 3 -0.25PbTiO 3 : x Pr 3+ ceramics by oxygen atmosphere sintering together with hot pressing sintering. When x = 1.5 mol%, a transparency of 68% @ 900 nm (close to the theoretical value ~71%) was achieved, and the piezoelectric properties increased to twice as much as those in undoped ceramics ( x = 0). The small average domain size (below 200 nm) that far below the visible light wavelength was believed to benefit light transmittance. Meanwhile, the minute amount of tetragonal component induced by Pr 3+ irons, was supposed to be responsible for the improved piezoelectric properties. These merits make Pr 3+ -doped 0.75PMN-0.25PT transparent ceramics promising functional materials for transparent piezoelectric devices.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Xiao-Dong Jian,Biao Lu,Dan-Dan Li,Ying-Bang Yao,Tao Tao,Bo Liang,Sheng-Guo Lu
Barium zirconate titanate (Ba(Zr x Ti 1-x )O 3 ) thick film ceramics were prepared using a tape-casting method. Their structures, morphologies, and electric properties were characterized using XRD , SEM and impedance analysis approaches, respectively. The electrocaloric effects (ECE), i.e., isothermal entropy changes and adiabatic temperature changes, were calculated using a Maxwell relation. It was confirmed by XRD and SEM that the obtained thick film ceramics are pure and dense perovskite structures. The dielectric analyses indicate that the Ba(Zr x Ti 1-x )O 3 thick film ceramics show characteristics of transition from normal to relaxor ferroelectrics with the increasing Zr 4+ ionic content. The polarization – electric field (P-E) hysteresis loops reveal larger polarizations and the ceramics can withstand an electric field as high as 12 MV/m. The adiabatic temperature changes ΔT calculated via the Maxwell relation and the polarization as a function of temperature, which is extracted from the P-E hysteresis loops measured at 12 MV m −1 are from 3.7 to 0.28 K with the increasing Zr 4+ ionic content.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
ACS Applied Energy Materials
·
2024
·
IF 5.4
HanChi Hu,HongXia Chen,ShuangWu Xu,MengCheng Zhou,XinYu Zhang,Tao Shen,HaiChen Li,HongMing Zhou
As a leading sodium-ion battery cathode material, O3-type layered oxides combine excellent theoretical specific capacity and cost-effectiveness, offering potential solutions for the large-scale energy storage industry. However, they still struggle with significant capacity degradation and inferior battery performance due to the narrow Na+ diffusion channels and complex phase. In this paper, we introduce Sb ions into the NaNi0.3Fe0.2Mn0.5O2 cathode material to improve its electrochemical performance. Our findings demonstrate that doping Sb results in an expansion of the Na layer spacing and cell volume, contributing to faster diffusion of Na+. Furthermore, the Na+/vacancy ordering and undesirable phase transition under high pressure are inhibited in the synthesized Na(Ni0.3Fe0.2Mn0.5)0.98Sb0.02O2 cathode material, which obtains a more boosting structure and advanced electrochemical performance. Within the voltage range of 2.0–4.2 V, the cathode material possesses an initial discharge specific capacity of 127.71 mAh g–1 and maintains a capacity retention of 82.34% (64.33% before doping) after 100 cycles. Moreover, at a 10 C current density, a high discharge specific capacity of 90.26 mAh g–1 is observed in the doped material. These results contribute essential insights for the design and advancement of cathode materials for sodium-ion batteries with outstanding properties.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
IONICS
·
2025
·
IF 2.6
Wan ZiYi,Lv JingBo,Zhang YaXin
High-entropy perovskite oxides (HEPOs) have emerged as promising electrode materials for supercapacitors. In this study, we successfully synthesized a series of HEPOs La 1- x Sr x (Co 0.2 Mn 0.2 Fe 0.2 Ni 0.2 Cu 0.2 )O 3 , using the sol–gel method. We thoroughly investigated the impact of Sr doping on the electrochemical properties of HEPO materials. Our findings indicate that the incorporation of a small amount of Sr enhances ionic conductivity and promotes the formation of oxygen vacancies and ionic vacancies within the crystal structure. The incorporation of Sr significantly improves the electrochemical performance of HEPOs materials. La 0.9 Sr 0.1 (Co 0.2 Mn 0.2 Fe 0.2 Ni 0.2 Cu 0.2 )O 3 electrode exhibits a maximum specific capacitance of 204.33 F/g at a scan rate of 2 mV/s, a significant increase compared to the undoped La(Co 0.2 Mn 0.2 Fe 0.2 Ni 0.2 Cu 0.2 )O 3 sample. Furthermore, La 0.9 Sr 0.1 (Co 0.2 Mn 0.2 Fe 0.2 Ni 0.2 Cu 0.2 )O 3 electrode exhibits excellent rate performance, maintaining 74% of its capacity when the current density was increased from 1 to 5 A/g. It also exhibits good cycling stability, with nearly no attenuation after 1000 cycles. Therefore, these results underscore the potential of our synthesized high-entropy perovskite oxides as electrode materials for supercapacitors applications.
研究领域:
材料科学
·
电化学
·
储能技术
✓ 已验证
产品关联
DOI
高影响因子
IET Nanodielectrics
·
2020
·Vol. 3
·期 4
·131-137
·
IF 0
Zhi-Gang Liu,Peng-Zu Ge,Hui Tang,Xin-Gui Tang,Si-Ming Zeng,Yan-Ping Jiang,Zhen-Hua Tang,Qiu-Xiang Liu
PbHf 1− x Sn x O 3 (PSH) ceramics were synthesised by a conventional solid-state reaction method. Dielectric properties were investigated in the temperature range of 20–650°C. As the Sn 4+ content goes up, the phase transition temperatures of an antiferroelectric (AFE1) to another intermediate antiferroelectric (AFE2) phase and AFE2 to the paraelectric (PE) phase decrease gradually. When x ≥0.1 for PSH ceramics, the ferroelectric (FE) phase appears around 225°C, and phase transition temperature from FE phase to PE phase goes up with the increasing concentration of Sn 4+ . Moreover, high-temperature dielectric relaxation (HTDR) phenomenon can be seen from all samples. Mechanism of HTDR was discussed from impedance spectroscopy and conductivity for PSH ceramics. It was found that three dielectric responses were observed in complex impedance plots and HTDR was involved with the movement of oxygen vacancies. Activation energy calculated from dielectric data suggested that the HTDR was governed by the hopping conduction process.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
APL Materials
·
2020
·Vol. 8
·期 6
·
IF 3.819
Li Xiu,Chen Chen,Zhang Faqiang,Huang Xintang,Yi Zhiguo
Photostrictive effect that has been discovered for over half a century is getting renewed interest in recent years in view of the great potentials for optomechanical applications. Ferroelectric materials represented by lead lanthanum zirconated titanate have been widely studied in this field because of their relatively large photostriction and fast photoresponse, but their wide bandgaps with limit response to visible light hinder further practical application. Here, visible-light-driven photostrictions of the order of 10 −3 are discovered in Bi(Ni 2/3 Nb 1/3 )O 3 –PbTiO 3 (BNNPT) ferroelectric solid solutions. Three BNNPT compositions with different phase structures, exhibiting notably different piezoelectric and photovoltaic properties, are selected to conduct the photostriction investigation, and their analogous photostrictive behaviors contradict with previous acknowledgment that the photostriction of ferroelectrics originates from the photovoltage-induced inverse piezoresponse. The nonuniform shifts of the XRD diffraction peaks under external laser illumination and the redshifts of the laser power dependent Raman modes disclose that the photostriction is mainly attributed to the light-induced distortion of BO 6 octahedra. This study sheds insight into the mechanism of the photostriction of ferroelectrics.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）