CARBON
·
2024
·
IF 10.5
Huiliang Wen,Wei Xu,Sen Lin,Aiguo Guan,Yingna Zhang,Xin Li,Chongbo Liu
As a representative magnetic oxide absorber, Fe 3 O 4 has attracted considerable research attention owing to its remarkable magnetic saturation strength as well as semiconducting properties. Doping Fe 3 O 4 with La 3+ leads to 3d-4f magnetic coupling and ion distribution changes due to the unique electron configuration and large ionic radius of La 3+ , thereby greatly enhancing the magnetic performance. However, high density, low dielectric loss, and low permeability at high frequencies inhibit the electromagnetic wave absorption (EMWA) performance of ferrites. In this study, stick-shaped Sn metal-organic framework (MOF) is in-situ grown on La 3+ -doped Fe 3 O 4 using a surfactant. After high-temperature annealing, the SnO 2 /porous carbon composites derived from Sn-MOF wrap the ferrite, forming a core-shell heterostructure, which not only prevents oxidation but also enhances the EMWA performance. Among the prepared La x Fe 3-x O 4 /SnO 2 /C (LFSC) samples, LFSC-2 (with La x Fe 3-x O 4 to Sn-MOF ratio of 1:2) exhibits strong absorption performance with a minimum reflection loss ( RL min ) of −44.1 dB. Furthermore, the gradient metamaterial based on LFSC-3 shows ultra-broadband EMWA with an effective absorption bandwidth ( RL min ≤ −10 dB) of 13.17 GHz. In addition, the LFSC-2 sample demonstrates excellent radar stealth capability in the radar cross section (RCS) far-field response, achieving an RCS reduction value of 20.4 dB∙m 2 .
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2023
·
IF 5.7
Juan Xie,Fang-Ze Han,Jing-Hui Zhang,Sheng Liu,Yu-Hua Tang,Cheng-Xin Li,Shan-Lin Zhang
La-doped SrTiO 3 (La x Sr 1−x TiO 3 , LST), as the promising ceramic-based interconnect material, usually needs to be sintered in reductive atmosphere at a temperature ≥ 1450 °C, such sintering condition is not friendly to cell fabrication and application. To reduce the sintering temperature of air-sintered LST, seven sintering additives, Bi 2 O 3 , Fe 2 O 3 , Li 2 O, MnO 2 , NiO, V 2 O 5 , and Co 3 O 4 , are added to the LST in this work. The results show that only Co 3 O 4 is conductive to remarkable sintering at the temperatures of 1250 °C. The relative density of LST-3%Co 3 O 4 reaches 92%, while that of the pure LST is only 48%. Moreover, the conductivity of LST-3%Co 3 O 4 achieves 8.2 S/cm at 800 °C in humidified hydrogen, which exceed 5.5 times that of the pure LST. Interestingly, LST-3%Co 3 O 4 exhibits an average TEC of 11.5 × 10 −6 K −1 between 400 and 900 °C, which is very close to that of other components of SOCs .
研究领域:
材料科学
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能源工程
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Baojia Qin,Yusen Wu,Ruijun Qiu,Jujun Ruan
For sustainable development of resources, pyrometallurgy, hydrometallurgy, and bioleaching have been widely employed in the recovery of waste lithium-ion batteries. Metallic resources have been successfully recovered by these technologies. However, high-value and comprehensive utilization technology of waste lithium-ion batteries is still in its infancy. In this paper, a combined technology of material molecular design and vacuum gasification deposition to prepare high-value optical materials (La-doped LiAl5O8) from the electrode materials of waste lithium-ion batteries is reported. The band gap of the designed La-doped LiAl5O8 was reduced by 1.077 eV compared to that of LiAl5O8. The La-d state caused a blue shift in the spectrogram so that the material can be excited by lower energy light. La-doped LiAl5O8 was successfully prepared by vacuum gasification deposition, and its strongest emission peak was at 450 nm. Photoluminescence intensity of La-doped LiAl5O8 was twice that of LiAl5O8. Chromaticity of the recovered La-doped LiAl5O8 was located at (0.17, 0.15), which indicated that La-doped LiAl5O8 was a highly efficient blue-emissive material and had great potential application in light-emitting diodes. This paper contributes to a new strategy in the value-added recovery of solid waste.
研究领域:
材料科学
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资源回收
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
Small Structures
·
2023
·Vol. 4
·期 11
·2300175
·
IF 15.9
Wenxian Li,Zulin Sun,Riyue Ge,Jiancheng Li,Yiran Li,Julie M. Cairney,Rongkun Zheng,Ying Li,Sean Li,Qian Li,Bin Liu
MoS 2 with 2D structure shows efficient hydrogen evolution reaction (HER) performance because undercoordinated Mo–S edges have ideal hydrogen adsorption free energy. MoS 2 usually does not satisfy the bifunctional catalysts because of the poor intrinsic oxygen evolution reaction (OER) catalytic activity. Herein, it is proposed to construct heterostructure with OER active components to induce efficient bifunctional catalytic activity along with heteroatom doping to modify the electronic structure to optimize the adsorption and desorption capabilities of reaction intermediates. La-doped Ni 3 S 2 /MoS 2 grown on nickel foam (La-NMS@NF) is synthesized as bifunctional catalyst taking advantage of the excellent OER performance of Ni 3 S 2 . La-NMS@NF evolves into nanoflower-like structures with the addition of La dopant, which provides abundant pore channels to facilitate mass transfer and exposure of active sites. Density functional calculations reveal that the La-doped Ni 3 S 2 /MoS 2 heterointerface can optimize the water adsorption and H * adsorption/desorption, improving the HER performance. The La-NMS@NF exhibits an overpotential of 154 and 300 mV for HER and OER at 100 mA cm −2 in 1.0 m KOH. Herein, a heteroatom-driven heterostructure activation strategy for electron rearrangement and structural evolution in electrocatalysts to decrease energy consumption in overall water splitting is demonstrated.
研究领域:
材料科学
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电化学
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Houde She,Suyue Cao,Jiufu Chen,Xiaoping Chen,Jingwei Huang,Lei Wang,Qizhao Wang
High indoor formaldehyde levels from residential decorations pose a pressing environmental concern, underscoring the urgency for effective catalytic degradation strategies. In this study, a La-doped ZnMn 2 O 4 catalyst with an oxygen-rich vacancy was successfully synthesized via a straightforward hydrothermal method. The experimental findings demonstrate that the L 0.5 ZMO catalyst, with a La doping amount of 0.5 mmol, exhibits a remarkable 100 % efficiency in degrading formaldehyde. Structural and spectroscopic analyses reveal that La doping in ZnMn 2 O 4 induces significant lattice expansion and an increased proportion of Mn 3 + species, both of which synergistically enhance the catalytic oxidation performance at room temperature. DFT results show that La doping concentrates the charge density near the Fermi energy level, significantly altering the charge distribution. This facilitates electron transfer, leading to enhanced photocatalytic performance. Furthermore, the introduction of oxygen vacancies generates abundant active sites, substantially improving the formaldehyde decomposition efficiency. This study highlights the critical role of La incorporation in modulating oxygen vacancies and surface properties of ZnMn 2 O 4 , yielding a cost-effective catalyst for efficient indoor formaldehyde abatement under ambient conditions.
研究领域:
环境科学
·
材料化学
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催化
·
纳米技术
·
室内空气质量
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2024
·Vol. 31
·期 14
·21632-21645
·
IF 0
He Yuanzhen,Zhong Dengjie,Xu Yunlan,Zhang Jiayou,Jiang Ran,Liao Pengfei
In this paper, La-doped Ti/SnO 2 -Sb 2 O 4 electrode was prepared by electrodeposition and used for electrochemical degradation of rhodamine B. The optimum preparation conditions of the electrode were optimized as deposition time of 15 min and calcination at 500 ℃ for 2 h. The water treatment conditions were selected as initial pH 3.0, electrolyte Na 2 SO 4 concentration 0.1 M, current density 30 mA cm −2 , and initial rhodamine B concentration 20 mg L −1 ; the color and TOC removal of RhB reached 99.78% and 82.41% within 30 min. The FESEM, XRD, XPS, CV, LSV, and EIS characterization studies demonstrated that Ti/SnO 2 -Sb 2 O 4 -1%La electrode had a dense structure and the highest oxygen evolution potential (2.14 V) and lowest charge transfer resistance (0.198 Ω cm −2 ), indicating that doped La has lower energy consumption. Moreover, La doping can expand the specific surface area, active site, performance of pollutant degradation, and service life of the electrode. Especially, the service life of Ti/SnO 2 -Sb 2 O 4 -1%La is increased by three times, and the maximum life span reaches 90 min (1000 mA cm −2 , 1 M H 2 SO 4 ). Free radical quenching experiments show that ·OH plays a major role in the degradation of RhB. The Ti/SnO 2 -Sb 2 O 4 -1%La electrode prepared in this paper and its results will provide data support and reference for the design of efficient electrocatalytic electrode. Graphical
研究领域:
电化学
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环境科学
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材料科学
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水处理技术
✓ 已验证
DOI
FUEL
·
2024
·
IF 6.7
Pengkai Shan,Hui Ye,Bin Qian,Yifeng Zheng,Guoping Xiao
Ruddlesden–Popper (R-P) oxides (A n+1 B n O 3n+1 ) are potential air electrodes for solid oxide electrolysis cells (SOECs) because of their good electrochemical performance. Among them, SrEu 2 Fe 2 O 7-δ (SEF) with n = 2 has received extensive attention because of its special structure and promising ionic–electronic conductivity. However, the SEF material is prone to degradation at high temperatures (600 °C–800 °C), and its long-term stability is easily affected. In this study, R-P oxide Sr 1-x La x Eu 2 Fe 2 O 7-δ (SLEFx; x = 0, 0.05, 0.1) was successfully synthesized using the sol–gel method. XRD results showed that La-doped SEF displayed good chemical and thermal compatibility with the gadolinia-doped ceria electrolyte. The SLEF0.05 electrode exhibited a polarization resistance of 0.075 Ω cm 2 at 800 °C, which was 88.2 % lower than that of SEF. The half-cell based on the SLEF0.05 air electrode exhibited improved performance under the long-term stability test at a current density of − 0.5 A cm −2 for over 110 h at 800 °C, indicating excellent stability. Moreover, an electrolysis current density as high as 0.712 A cm −2 at 1.5 V was obtained for the full cell with the SLEF0.05 air electrode, which was 45.8 % higher than the SEF electrode when the temperature and feed gas were 800 °C and 50 % CO 2 –50 % CO, respectively. The XPS and cell testing results confirmed that La with high valance and small radius promoted the formation of oxygen vacancies and effectively enhanced the electrochemical performance and structural stability of the SEF material. Therefore, the R-P oxide SLEF0.05 is a promising air electrode material for SOECs.
研究领域:
材料科学
·
电化学
·
能源材料
·
催化
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Yiran Zhang,Chunping Wu,Bang Xiao,Lin Yang,Anqi Jiao,Ke Li,Ting Chen,Reggie Zhan,Zhen Huang,He Lin
Detection of NO 2 attracted increasing interest to check the air quality and monitor exhaust emission of combustion facilities. In this study, the flame spray pyrolysis (FSP) method was used to prepare the La-doped WO 3 nanoparticles as NO 2 sensing materials for the first time. The FSP-made La-doped WO 3 nanoparticles showed that the doped La atoms were dispersed homogeneously on WO 3 particles in the form of La 2 O 3 . It was observed that in the concentration range of 150–1200 ppb at 125 ℃ , the WO 3 sensing responses were enhanced by La doping from 2.5 at% to 10 at%, and exhibited the highest sensing response when the La doping ratio was 7.5 at%. The 7.5 at% La-doped WO 3 shows the highest response (74.2) toward 900 ppb NO 2 at 125 ℃ with response/recovery times of 23 and 35 s. Then, the high-resolution XPS spectra and sensing mechanism were combined to investigate the La-doping effects, it can be found that the enhancement of La doping might result from the enriched vacancy oxygen and more absorption sites, as well as the p-n heterojunction that drives more electrons to react with NO 2 . Moreover, the sensor using 7.5 at% La-doped WO 3 presented an excellent anti-interference performance to single NH 3 , SO 2 , CO, CO 2 , and CH 4 , but were disturbed by ppm-level NH 3 and SO 2 coexisted with NO 2 . It also exhibited good resistance to RH fluctuation and good stability.
研究领域:
材料科学
·
环境监测
·
纳米技术
·
传感器
✓ 已验证
DOI
高影响因子
ChemistrySelect
·
2025
·Vol. 10
·期 29
·e02906
·
IF 2
Haojun Zhang,Gengrui Zhao,Shaoting Ma,Bin Zhang
Graphical A novel method enhances triboelectric nanogenerator (TENG) output by using La-doped bismuth ferrite nanoparticles as the triboelectric layer filler. Under the filler concentration threshold, the output performance of the TENG with 1.5 wt% La-doped BFO fillers is significantly enhanced compared to that with undoped BFO fillers. Additionally, a self-powered anticorrosion system is developed using this TENG as the energy source. Incorporating high-permittivity nanoparticles as fillers into triboelectric layers is an effective strategy to enhance the output performance of triboelectric nanogenerators (TENG). However, exceeding the critical filler concentration threshold causes nanoparticle aggregation, limiting further output performance enhancement of TENG. Here, a novel approach is proposed to enhance TENG output performance by doping lanthanum (La) into bismuth ferrite (BFO), forming La-doped BFO nanoparticle fillers (BLFO) to further improve the output performance of polyvinylidene fluoride (PVDF)-based TENG without increasing filler concentration. This approach overcomes the limitation of nanoparticle aggregation at high filler loadings while significantly enhancing the output performance of TENG. Below the critical concentration threshold, the dielectric constant of BLFO/PVDF composites increases by 32% compared to undoped BFO/PVDF composites. Consequently, the BLFO/PVDF-based TENG achieves a high output voltage of 329 V and short circuit current of 44 µA, representing 43% and 69% increases over the BFO/PVDF-based TENG, respectively. Notably, these values represent 219% and 193% increases compared to the pure PVDF-based TENG. Furthermore, a self-powered anticorrosion system powered by the BLFO/PVDF TENG demonstrates effective metal protection, as evidenced by open-circuit potential measurements and reduced average corrosion rates.
研究领域:
能量收集
·
材料科学
·
纳米技术
·
电化学
·
防腐保护
✓ 已验证
产品关联
DOI
高影响因子
IEEE TRANSACTIONS ON ELECTRON DEVICES
·
2025
·
IF 3.2
Qian Gao,Gang He,Bo He,Yanmei Liu,Yongli He,Shanshan Jiang,Huanhuan Wei,Can Fu
The development of high-performance neuromorphic phototransistors plays a fundamental role in advancing image perception systems by enabling low-latency, event-driven light sensing and accelerating the training of memory-efficient deep neural networks. Here, artificial synaptic phototransistors with synaptic plasticity are fabricated based on La-doped In2O3 nanofibers (InLaO NFs), demonstrating an integrated artificial synapse that mimics both central and visual neural functions. The device exhibits not only exceptional electrical performance, with a high field-effect mobility of 7.70 cm2V-1s-1, an ultralarge ON/OFF current ratio (>1 × 108), but also a strong photoresponse of 28.2 nA under light illumination. Through excitatory response modes, fundamental biological functions, including excitatory postsynaptic current (EPSC), paired-pulse facilitation (PPF), and the transition from short-term plasticity (STP) to long-term plasticity (LTP), are simulated by the synaptic transistor. Furthermore, in optoelectronic co-modulation, the high synaptic weights enable the device to emulate complex neural learning rules relevant to neuromorphic applications, such as classically conditioned reflexes and image recognition tasks. These results highlight the potential of InLaO NFs-based synaptic transistors as promising candidates for bio-inspired synaptic devices and advanced neuromorphic systems.
研究领域:
神经形态工程
·
纳米材料
·
光电子学
·
人工智能
·
合成生物学
·
神经科学
·
材料科学
·
电气工程
✓ 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）