LANGMUIR
·
2023
·
IF 3.9
Ruixin Song,Shifei Kang,Liangtao Yao,Lulu Zheng,Dechao Yu,Dawei Zhang
BiVO4 has been widely used in the field of photocatalysis due to its nontoxic and moderate band gap. However, single BiVO4 has the disadvantages of a high recombination rate of photogenerated carriers and weak response to visible light, inhibiting its photocatalytic applications. To explore viable solutions, a hybrid material composed of lanthanum-doped bismuth vanadate (La-BiVO4) and oxygen-doped porous graphite carbon nitride (O-doped g-C3N4), i.e., La-BiVO4/O-doped g-C3N4 powder, was prepared by a facile hydrothermal reaction and low-temperature calcination. Then, the powder was loaded on polyacrylonitrile nanofibers (NFs) through the electrospinning fiber technique. Various surface science characterizations, including transmission electron microscopy and nitrogen absorption and desorption analysis, confirmed the successful synthesis of a mesoporous heterojunction material. The La3+-doping as well as the porous morphologies and larger specific surface area of the O-doped g-C3N4 ultimately improve the photocatalytic abilities via a proposed Z-scheme heterojunction mechanism. The roles of La3+-doping and morphology modification in promoting the separation of the photogenerated carriers and broadening the optical absorption range were experimentally discussed. The RhB degradation experiment indicated that the La-BiVO4/O-doped g-C3N4 powder has excellent photocatalytic activity, which is about 2.85 and 2 times higher than that of the pure BiVO4 and O-doped g-C3N4, respectively. Meanwhile, the La-BiVO4/O-doped g-C3N4 NF shows good stability and recoverability after a 10-cycle testing. Such a hybrid photocatalyst with a proposed Z-scheme heterojunction mechanism and good plasticity might pave a feasible way to fabricate a new library of photocatalysts.
研究领域:
材料科学
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环境科学
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产品关联
DOI
PubMed
高影响因子
Catalysis Science & Technology
·
2015
·Vol. 6
·期 4
·1033-1041
·
IF 5.426
Yansong Zhou,Gang Chen,Yaoguang Yu,Lichen Zhao,Qilin Yu,Qiang He
In this work, lanthanum (La) has been proven as an effective space charge layer modifier to promote efficient photogenerated charge carrier separation for ZnO:GaN solid solution photocatalysts with enhanced photocatalytic water-splitting performance. Photogenerated electron–hole pairs are effectively separated due to the increase of the thickness of the space charge layer after La-doping. The stable photocatalytic activity of the ZnO:GaN solid solution photocatalysts for overall water-splitting was remarkably enhanced by about 3.4 times when the La-doping concentration was 3% in atom ratio. The maximum apparent quantum efficiency of the La-doped (3% in atom percentage) ZnO:GaN solid solution photocatalyst for photocatalytic water oxidation was up to 14.5% at 350 nm without loading of any co-catalyst.
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Chengyi Zhu,Jianxiong Liu,Xiaohua Yu,Yingjie Zhang,Peng Dong,Xiao Wang,Yannan Zhang
Spinel LiMn 2 O 4 is regarded as a promising positive material candidate for contemporary lithium-ion batteries (LIBs). However, its development is hindered by the poor Li + diffusion during high charge/discharge rates and unstable cyclic performance associated with Mn dissolution under elevated temperature. Herein, a facile hydrothermal method with solid-state calcination is introduced to design one-dimensional (1D) La-doped LiMn 2 O 4 nanorods and ultimately enhance their cathode utilization in high-temperature and long-cycling conditions. Surprisingly, LiLa 0.03 Mn 1.97 O 4 nanorods exhibit excellent high-temperature cyclic performance for over 1000 cycles, and deliver a promising discharge capacity of 87.2 mAh g −1 at 20C rate. Furthermore, theoretical calculations confirm that compared with the pristine sample, a lower bandgap and dispersed distribution of electrons are also strong evidence of the improved electrochemical performance of LiMn 2 O 4 after La doping. This research offers a new strategy to achieve high-performance LiMn 2 O 4 -based positive materials for the development of advanced LIBs.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
Nano Research
·
2018
·Vol. 11
·期 3
·1369-1378
·
IF 7.994
Yang Shenghong,Sun Xiaohan,Wang Zhaoyan,Wang Xiayan,Guo Guangsheng,Pu Qiaosheng
An anomalous enhancement of fluorescence of carbon dots (CDs) was observed via lanthanum (La) doping. La-doped CDs (La-CDs) were prepared through microwave pyrolysis within 4 min. With La 3+ doping, the emission band shifted from blue to green although La 3+ is non-fluorescent. The quantum yield and fluorescence lifetime improved by about 20% and 35%, respectively. All experiment results indicate that La 3+ doping is an effective way to tune fluorescence and improve the performance of CDs. Another unique attribute of La-CDs is high sensitivity to Fe 3+ . The La-CD-based fluorescence probe was established and used for sensitive and selective detection of Fe 3+ with a limit of detection of 91 nmol/L. The proposed fluorescence probe also was successfully employed to visualize intracellular Fe 3+ in live HeLa cells through cell imaging. It was also shown that yttrium exhibited the same fluorescence enhancement effect as La. The results may provide a new route for preparing CDs with special properties.
研究领域:
材料科学
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生物医学
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分析化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Zhao Li,Lei Wu,Min Chen,Qiwu Zhang,Shujuan Dai,Tonglin Zhao
Bismuth oxyiodide is one of the bismuth-based semiconductors which exhibits narrow band gaps and excellent visible light response, however modification strategies are usually desired for improving its photocatalytic reactivity. In this context, introduction of valuable components into the interlayer of BiOI is expected to work, considering its typical layered structure. In this case, mechanochemical synthesis of BiOI, with simultaneous introduction of lanthanum into its interlayer to form Bi 1-x La x OI, was conducted for the first time, and arsenic (As(III)) was selected to evaluate the photocatalytic reactivity, demonstrating excellent reaction efficiency for arsenic oxidation under a mild condition. Characterizations confirmed the incorporation of La and the presented well crystalline structure of Bi 1-x La x OI, and revealed its better visible light absorption capacity than raw BiOI. Besides the excellent electronic conductivity of Bi 0.9 La 0.1 OI, photogenerated holes (h + ) and superoxide radical species (· O 2 - ) were characterized by electron spin resonance (ESR) test, to act as predominant reactive groups during the photo-induced oxidation reaction. These findings provided a novel concept for the interlayer decoration of BiOI, and offered an alternative approach to develop its potential application for the removal of hazardous arsenic pollutants.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2014
·
IF 4.058
Hong Peng,Jie Cui,Hongju Zhan,Xu Zhang
Magnetic lanthanum doped TiO 2 (Fe 3 O 4 /SiO 2 /La-TiO 2 , referred to magnetic La-TiO 2 ) and undoped magnetic TiO 2 (Fe 3 O 4 /SiO 2 /TiO 2 , referred to magnetic TiO 2 ) hybrid microspheres with uniform magnetic cores (Fe 3 O 4 /SiO 2 ) were synthesized and characterized in this work. The results indicate that the photoactivity of the magnetic La-TiO 2 is much higher than that of the magnetic TiO 2 for the degradation of 2,4,6-trichlorophenol (10 μM) under UV–visible light irradiation ( λ ⩾ 340 nm). The initial degradation rate ( R 0 , μM/min) for the photodegradation of 2,4,6-trichlorophenol (10 μM) in a 2 g/L magnetic La-TiO 2 dispersion is 0.45 μM/min, which is 1.8 times larger than the value obtained in a 2 g/L magnetic TiO 2 dispersion. The activities of these two catalysts decreased after seven cycles use, probably due to the reduction of surface hydroxyl groups and reaction sites. Carboxylate acids and Cl − were detected as advanced oxidation products. Thus, after 120 min of degradation, the treated 2,4,6-trichlorophenol solution showed no toxicity to HeLa cells. The results clearly demonstrate that the magnetic TiO 2 particularly magnetic La-TiO 2 , would be an effective catalyst for the treatment of solutions polluted with chlorophenols.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2023
·
IF 22.1
Liuxin Xu,Ya Pan,Hongmei Li,Ruichao Xu,Zhihu Sun
The presence of interfacial sites between Pt-group metals and transition metal oxides can effectively improve the catalytic activity of Pt-group catalysts, but under moisture-rich conditions they suffer from severe deactivation due to water poisoning of the active sites. Here, we propose for the first time a Lanthanum (La)-doping strategy to improve the water-resistance of the Pt-based catalysts. We synthesized a Pt-CoO/Al 2 O 3 catalyst that is active for CO oxidation under dry conditions but deactivates rapidly under moisture. This rapid deactivation is overcome by La-doping, which delivers boosted activity (100 % CO conversion at 15 °C) and long-term on-stream stability. In situ X-ray absorption fine-structure and in situ diffuse reflectance infrared Fourier transform spectra revealed that the doped La, in the form of La 2 O 3 , plays dual roles of suppressing the carbonate formation on the active sites and modifying the electronic structure of Pt. The synergetic effects between La 2 O 3 and the active Pt−O−Co interfacial sites in La-doped Pt-CoO/Al 2 O 3 lead to the outstanding activity under the moisture-rich condition.
研究领域:
催化化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS CHARACTERIZATION
·
2020
·
IF 3.562
Yuping Wang,Shuying Shi,Qing Dong,Chonghe Xu,Silun Zhu,Xiaoqian Zhang,Yuk Tak Chow,Xinqiang Wang,Guanghui Zhang,Luyi Zhu,Dong Xu
As the pillar material of the electronic ceramic industry, BaTiO 3 (BTO) has superior dielectric and piezoelectric properties . In this present work, pure phase BTO and lanthanum-doped Ba (1–x) La x TiO 3 (BL x T) fibers (x=0.003, 0.006, 0.009 and 0.012) were prepared by electrospinning method with polyacetylacetonatotitanate (PAT). All the fibers after heat-treatment were tetragonal phase with good crystallinity; additionally, the tetragonal phase BTO ceramics have better dielectric properties than the cubic ones. BTO fiber (BTOF) and powder (BTOP) were pressed and sintered into ceramic sheets with BTOF having better formability. Compared with BTOP ceramics, BTOF ceramics had obvious micro-capacitance effect, so they had higher dielectric constants at low frequencies (f < 3000 Hz). Therefore, BTOF ceramics were excellent low frequency capacitor materials which could be applied to low frequency filters. The BTOFs were doped with La 3+ to further improve the dielectric properties. When the doping concentration was 0.9%, the dielectric constant of BL x T fiber ceramics reached the maximum value of 5100 (25 °C, f = 100 Hz). The downward trend of Curie temperature was more uniform with the increase of La 3+ doping amount, pointing to obvious advantages in the manufacturing of temperature-controlled capacitors.
研究领域:
电子陶瓷
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材料科学
·
介电材料
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Shan Gao,Haidong Yu,Yuewen Zhang,Hongan Ma,Xiaopeng Jia
Thermoelectrics (TE) have received a lot of attention for their ability to directly convert heat into electricity. This capability provides a promising solution for waste heat recovery and clean energy utilization. Strontium titanate (SrTiO 3 ) is a promising N-type oxide TE material. However, its practical application is limited by low electrical conductivity and high thermal conductivity. Here, we present a high-pressure synthesis technique aimed at simultaneously introducing defects as well as enhancing phonon scattering. Enhancing the thermoelectric properties of strontium titanate thermoelectric materials. SrTiO 3 samples doped with different concentrations of La were synthesized by high-pressure high-temperature (HPHT) synthesis, which effectively promotes the solid-phase reaction and thus allows for a more homogeneous and efficient doping of La atoms into the SrTiO 3 lattice as compared to the conventional synthesis method. The introduction of La 3+ creates a charge imbalance, which is compensated by the formation of oxygen vacancies. These oxygen vacancies act as donor defects, which in turn increase the carrier concentration and significantly improve the electrical conductivity of the samples. At the same time, the HPHT synthesis conditions induced severe lattice distortions, leading to grain refinement and the formation of dislocation networks and nanopores. By modulating the density and distribution of multiscale defects, La doping significantly improves the interfacial phonon scattering efficiency. This condition reduces the thermal conductivity and improves the thermoelectric properties. By combining defect engineering and interfacial phonon scattering, we achieved the decoupling of electrical and thermal transport properties in La-doped SrTiO 3 . Consequently, the thermoelectric figure of merit ( zT ) was significantly enhanced, reaching 0.18 at 973 K. This study introduces a new methodology and theoretical foundation for the development of high-performance oxide TE materials.
研究领域:
材料科学
·
热电材料
✓ 已验证
产品关联
DOI
高影响因子
Science China-Materials
·
2024
·
IF 6.8
He Xun,Xie Ting,Dong Kai,Nan Jue,Sun Hang,Yao Yongchao,Fan Xiaoya,Zheng Dongdong,Luo Yongsong,Sun Shengjun,Liu Qian,Li Luming,Chu Wei,Xie Lisi,Kong Qingquan,Sun Xuping
Electrocatalytic reduction of nitrate (NO 3 − ) can efficiently transform NO 3 − into ammonia (NH 3 ), enabling the simultaneous removal of NO 3 − pollutant from wastewater and the production of NH 3 . Here, we report the use of rare-earth lanthanum-doped Co 3 O 4 nanowires array on carbon cloth (La-Co 3 O 4 /CC) as an efficient electrocatalyst for the conversion of NO 3 − to NH 3 . The as-synthesized La-Co 3 O 4 /CC demonstrates a remarkable NH 3 Faradaic efficiency (96.36%) and NH 3 yield (537.44 µmol h −1 cm −2 ), markedly surpassing its Co 3 O 4 counterpart (87.78%, 279.4 µmol h −1 cm −2 ). Theoretical computations unveil that the incorporation of La doping promotes NO 3 − adsorption and optimizes the hydrogenation process, thus enhancing the electroreduction activity of Co 3 O 4 in NO 3 − conversion and NH 3 selectivity. Furthermore, a Zn–NO 3 − battery incorporating La-Co 3 O 4 /CC achieved a peak power density of 9.86 mW cm −2 . This work advances the application of Co 3 O 4 -based electrodes in electrocatalysis and highlights the effectiveness of rare earth element doping in NO 3 − reduction reactions.
研究领域:
环境科学
·
电化学
·
材料科学
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Xuping Li,Yanwei Li,Xingtang Xu,Xiaohua Wang,Guang Sun,Bo Zhang,Yan Wang,Jianliang Cao
Metal oxide semiconductor (MOS)-based hydrogen (H 2 ) sensor that can work at room or near room temperature has attracted an increasing concern owing to its potential application in hydrogen storage and utilization. Herein, a co-sensitization strategy by La doping and Pd decoration is proposed to realize the detection of H 2 at near room temperature (50 °C) on In 2 O 3 porous nanotubes (PNTs). The In 2 O 3 PNTs were prepared via a solvothermal method and then sequentially doped with La 3+ and decorated with Pd nanoparticles via an immersion, freeze-drying and calcination route and a chemical reduction method, respectively. The results of gas-sensing measurements indicated that after a compositional evolution from In 2 O 3 to La-doped In 2 O 3 (La-In 2 O 3 ) and Pd-decorated La-In 2 O 3 (Pd/La-In 2 O 3 ), the fabricated H 2 sensor showed a higher sensitivity at lower operating temperature. At a near room temperature of 50 °C, the response of the best Pd/La-In 2 O 3 sensor to 50 ppm H 2 was as high as 8.34, increasing about 4.85, 1.20 and 1.15 folds compared to the In 2 O 3 (1.72 at 160 °C), La-In 2 O 3 (6.97 at 150 °C) and Pd/In 2 O 3 (7.24 at 80 °C) sensors, respectively. The sensitization effects and mechanism of La dopant and Pd modifier as well as their synergistic effects were discussed in detail.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2025
·
IF 11.3
Chaolong Liu,Keng Xuan,Yaoping Guo,Hao Jiang,Wenjie Ma,Xuegang Wang,Zhongkui Zhou,Jun Li,Yadan Guo
WO 3 -based materials are theoretically promising photocatalysts for uranium(VI) removal due to their stability and narrow bandgap (∼2.8 eV), but they are limited by a lack of adsorption sites and a tendency for photogenerated electron-hole pairs to recombine. Herein, La-doped WO 3 (W 0.9 La 0.1 O 3-x ) rich in oxygen vacancies (OVs) was prepared via a facile hydrothermal method. La doping and the introduction of OVs provided abundant active sites, optimized the band structure, increased electron density, and inhibited electron-hole pair recombination of W 0.9 La 0.1 O 3-x , which resulted in a maximum U(VI) extraction capacity of up to 1199.73 mg/g through synergistic adsorption-photocatalytic reduction processes. Interestingly, W 0.9 La 0.1 O 3-x demonstrated excellent stability and increased recyclability, superior to that of most reported adsorbents and photocatalysts, probably owing to the strong stability of W and La atoms as well as the additional OVs formed from self-reduction of W 0.9 La 0.1 O 3-x during photocatalytic reaction process. Overall, this study expands the application of WO 3 -based materials for U(VI) removal from wastewater and provides valuable theoretical insights and technical guidance for addressing the challenge of balancing removal rate and stability of U(VI) extraction materials.
研究领域:
环境科学
·
材料科学
✓ 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）