APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Erbing Hua,Shu Jin,Xiaorong Wang,Shuang Ni,Gang Liu,Xiaoxiang Xu
In this work, novel 2D type-II p-n heterojunctions La 2 Ti 2 O 7 /In 2 S 3 have been fabricated. The heterojunctions exhibit much improved photocatalytic activity over individual moieties and their physical mixtures in which 18-fold increment in hydrogen production has been achieved under visible light illumination (λ ≥ 400 nm). Their superior activities stem from intimate face-to-face contact between La 2 Ti 2 O 7 and In 2 S 3 in the heterojunctions which guarantee facile charge interchange. Photoelectrochemical analysis suggests that efficient charge separations occur at the interfaces of the heterojunctions and contributes to a prolonged charge lifetime as well as the much enhanced photocatalytic activities. Such a simple strategy by fabricating ultrathin type-II p-n heterojunctions also warrant promising applications in other areas such as optoelectronics, sensors etc. whereby efficient charge separations are needed.
研究领域:
材料化学
·
光催化
·
纳米材料
·
能源科学
·
半导体物理
·
环境催化
·
可持续能源
✓ 已验证
DOI
高影响因子
Analytical Methods
·
2014
·Vol. 6
·期 20
·8314-8320
·
IF 1.938
Zhuo Guo,Yin Lu,Jian Li,Xian-feng Xu,Guo-qing Huang,Ze-yu Wang
A nano-complex of graphene and La(OH)3 nanowires (GR–La(OH)3) was prepared for the fabrication of a voltammetric sensor, which was used to simultaneously determine the two isomers of dihydroxybenzene, hydroquinone (HQ) and catechol (CC). The modified electrode exhibited excellent sensitivity and selectivity in the determination of HQ and CC mixed in a 0.1 M Na2HPO4–C4H2O7 buffer solution (pH 4.0). Both HQ and CC appear to be a pair of quasi-reversible redox peaks and the potential difference between oxidation peaks of HQ and CC was 112 mV. Under the optimized conditions, the oxidation peak current of both HQ and CC was linear in the range of 5 to 300 μM in the presence of 50 μM of the other one in the solution. The detection limit was found to be 0.015 μM for HQ and 0.01 μM for CC (S/N = 3). The proposed method was further successfully applied to the simultaneous determination of HQ and CC in artificial wastewater samples, and the results showed good stability and high reproducibility.
研究领域:
分析化学
·
环境监测
·
电化学
·
纳米材料
·
传感器技术
✓ 已验证
DOI
高影响因子
Journal of Macromolecular Science Part B-Physics
·
2024
·
IF 1.2
Mengmei Yin,Kangrui Yuan,Zhengqi Lv,Yiwen Yuan,Xichen Feng,Qinghua Wu
Lanthanide luminescent materials have rapidly emerged as potential candidates in the fields of drug delivery and bioimaging. In this study a spherical composite material theory with uniform particle size, good biocompatibility, fluorescence emission performance and an efficient targeted drug delivery system was proposed. To achieve this, a facile ultrasonic atomization approach to synthesize sodium alginate-lanthanum (SA-La) cross-linked microspheres at room temperature was developed, and then they were loaded with doxorubicin (DOX), yielding DOX@SA-La for targeted liver cancer cell treatment. Fluorescence studies indicated that the SA-La microspheres exhibited excellent fluorescence properties with intense blue fluorescence emitted. Moreover, the ability of drug release in-vitro of the SA-La and Calcium alginate (SA-Ca) microspheres were proved by UV-visible spectrophotometry, and the drug release values of these two drug carriers were considerable. In addition, cytotoxicity tests via the CCK-8 assay revealed that the DOX@SA-La delivery system considerably inhibited hepatocellular carcinoma cells growth. Conclusively, the SA-La fluorescent microsphere drug carriers enables real-time anti-cancer efficacy observations and analyses, having promise as a potent therapeutic and diagnostic tool for liver cancer treatments and drug tracing in the tumors.
研究领域:
药学
·
材料科学
·
生物医学工程
·
肿瘤学
·
生物化学
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2021
·
IF 9.127
Xuewen Zheng,Ting Yang,Jianghai Wei,Chengyang Wang,Mingming Chen
Solid electrolytes have been actively researched for rechargeable lithium batteries , but low ion conductivity ( σ ) and the growth of lithium dendrites hinder their practical applications. This study synthesizes a composite solid electrolyte combining polyethylene oxide (PEO) with Li 7 La 3 Zr 2 O 12 nanofibers (LLZO NFs) and quenching in liquid nitrogen . The LLZO NFs efficiently increase the σ and mechanical strength of composite polymer electrolytes (CPEs), thereby promoting the uniform deposition of lithium metal and inhibiting the growth of lithium dendrites. More importantly, the quenching markedly reduces the crystallinity of the electrolyte, which further enhances the ionic conductivity even at 30 °C. The CPEs exhibit high σ (1.09 × 10 −4 S cm −1 at 30 °C) and enlarged electrochemical window (up to 5 V vs . Li/Li + ). An integrated all-solid-state lithium metal battery (ASSLMBs) (labeled as LiFePO 4 |PEO/LLZO NFs/LiTFSI- q |Li) delivers high initial discharge capacity (138.8 mAh g −1 ) and excellent cycling stability (74.8% at 0.5C after 300 cycles) with remarkable capacity retention (84.0% at 1C after 200 cycles) at 45 °C. This strategy enables the promotion and application of ASSLMBs at room temperature.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
DOI
高影响因子
ENERGY & FUELS
·
2020
·
IF 3.421
Qiongqiong Jiang,Yali Cao,Xiangyu Liu,Hao Zhang,Hui Hong,Hongguang Jin
Chemical looping combustion (CLC) can achieve the benefits of efficient conversion of hydrocarbon fuels and zero-energy CO2 capture using oxygen carriers (OCs) with facilitated oxygen transport properties. The current study details the use of Cu- and Ca-doped lanthanum nickel perovskite-type materials as the OC in CLC processes. By incorporation of lanthanum nickel oxide with copper and calcium, the oxygen storage capacity and average transport rate of La1–yCayCuxNi1–xO3 are up to 7.8 wt % and 0.82 wt % min–1, respectively, during the methane CLC process at 400 °C, whereas undoped LaNiO3 cannot react with methane at a low temperature. Simultaneously, substituted lanthanum nickel oxides can decrease the oxygen transport temperature by about 70 °C compared to undoped lanthanum nickel oxide. X-ray diffraction, Brunauer–Emmett–Teller, and scanning electron microscopy of the samples were characterized in terms of particle properties and morphology to unveil the rational reasons of the high oxygen transport at lower temperatures. The enhancement of the specific surface area and stable porous morphology in La1–yCayCuxNi1–xO3 can both facilitate the oxygen transport in CLC processes. Experiments were executed to investigate the reactivity of the redox materials on the standpoints of oxygen capacity, stability, and regenerability. Hydrogen and methane as the fuels are both considered in this study. La1–yCayCuxNi1–xO3 showed favorable reactivity and stability in the successive redox cycles at low temperatures. These experimental results indicate that La1–yCayCuxNi1–xO3 can facilitate O2– transport and have the potential to be used as the promising OC for low-temperature CLC processes.
研究领域:
能源化学
·
材料科学
·
化学工程
·
环境科学
·
催化化学
✓ 已验证
DOI
高影响因子
KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2016
·Vol. 33
·期 6
·1837-1845
·
IF 1.408
Liu Dongjing,Zhou Weiguo,Wu Jiang
Performance of CeO 2 -La 2 O 3 /ZSM-5 sorbents for sulfur removal was examined at temperature ranging from 500 oC to 700 oC. The sulfur capacity of 5Ce5La/ZSM-5 was much bigger than that of CeO 2 /ZSM-5. H 2 had a negative impact on the sulfidation; however, CO had little influence on sulfur removal. The characterization results showed that CeO 2 and La 2 O 3 were well dispersed on ZSM-5 because of the intimate admixing of La 2 O 3 and CeO 2 , the major sulfidation products were Ce 2 O 2 S and La 2 O 2 S, the XRD and SEM results revealed that ZSM-5 structure could remain intact during preparation and sulfidation process, the H 2 -TPR showed that the reducibility of CeO 2 can be remarkably enhanced by addition of La.
研究领域:
材料科学
·
环境化学
·
催化化学
·
能源工程
·
无机功能材料
·
气体净化
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Kun He,Libin Zhang,Yuan Liu,Beibei Xu,Liang Chen,Gongxun Bai
The non-contact thermometry based on fluorescence intensity ratio of phosphors has been extensively investigated owing to its high sensitivity and fast response. However, most of them only use a single mode of upconversion or downconversion emission for temperature sensing and ignore the affection of the humidity. In this work, the Yb/Er ions doped La 2 Mo 3 O 12 microcrystals with nonhygroscopic property and multimode luminescence have been developed for temperature sensing. The optical thermometer could be based on not only luminescent intensity ratio of upconversion and downconversion, but also average fluorescence decay lifetime. The maximal absolute sensitivity can reach up to 6.2% K −1 and the maximal relative sensitivity is 1.63% K −1 . Moreover, the fluorescence emission intensity of the doped La 2 Mo 3 O 12 microcrystals will not be affected by the humidity compared to some doped molybdate and tungstate . These excellent performances suggest that the La 2 Mo 3 O 12 :Yb/Er microcrystals possess great potential for practical applications in temperature sensing.
研究领域:
材料科学
·
光学工程
·
无机化学
·
传感器技术
·
生物医学工程
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2015
·
IF 4.097
Cheng-Hui Zeng,Xiao-Ting Meng,Song-Song Xu,Li-Jun Han,Shengliang Zhong,Mei-Ye Jia
A rarely reported polymorphic lanthanide complex is prepared by acetylacetone (acac) tuning method. Luminescence properties of 1 are studied. Interestingly, 1 is proved to be a multifunctional material. It is a highly selective and sensitive Co 2+ sensor, among 24 species, only Co 2+ quenching the Tb 3+ centered luminescence. The possible sensing mechanism is the decomposition of 1 which induced by Co 2+ . The limit of detection (LOD) for sensing Co 2+ is as low as 330 nM, which is lower than the standard of Chinese environmental protection department. Mechanism study confirmed the luminescence quenching can be ascribed to the decomposition of 1 which induced by Co 2+ . Further investigations find 1 -Co 2+ can be applied as tunable luminescent timer, by tuning the ratio of 1 /Co 2+ . CIE coordinates of 1 -Co 2+ change regularly (has excellent linearity) from green to violet with the time increasing.
研究领域:
分析化学
·
无机化学
·
材料科学
·
环境监测
·
生物传感
·
分子探针
✓ 已验证
DOI
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2022
·
IF 6.267
Song-Tao Dong,Xin Ye,Zhuang Fu,Xiaoyun Jin,Junlin Wei,Lei Wang,Ya-Mei Zhang
In this study, a series of La 1−x Sr x AlO 3 (x = 0.0, 0.1, 0.15, and 0.2) nanotubes were prepared by electrospinning method, and their morphological and electrochemical properties were characterized. The results show that the La 1−x Sr x AlO 3 (x = 0.0, 0.1, 0.15, and 0.2) nanotubes exhibit a distinct hollow structure, the average diameters of the nanofibers are ∼75 nm, 70 nm, 95 nm, and 142 nm. The electrochemical results show that the La 1−x Sr x AlO 3 nanotubes have excellent electrochemical performance, and the maximum specific capacitance of 180 F/g for the La 0.9 Sr 0.1 AlO 3 . After 1500 charge–discharge cycles, the specific capacitance of the La 0.9 Sr 0.1 AlO 3 electrode retained ∼99%, indicating that it has good cycling stability and long service life. This provides a promising electrode material for supercapacitors.
研究领域:
材料科学
·
电化学
·
纳米材料
·
能源存储
·
功能陶瓷
·
电容器
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Man Tian,Hujun Cao,Laijun Liu,Jungu Xu
In this work, a series of multiple lanthanide and tungsten co-doped fluorite structured (Bi 2 O 3 ) 0.95- x (Ho 0.4 Er 0.4 Tm 0.4 Yb 0.4 Lu 0.4 O 3 ) x (WO 3 ) 0.05 ( x = 0.1, 0.2, 0.3, 0.4) and (Bi 2 O 3 ) 0.26 (Ho 0.5 Er 0.5 Tm 0.5 Yb 0.5 O 3 ) 0.48 (WO 3 ) 0.26 materials were prepared by traditional solid-state reaction method. The phases, stabilities, and electrical properties of these materials were thoroughly studied. The results revealed that under high oxygen partial pressure, CO 2 , or inert atmospheres, all these samples had excellent long term thermal stability and chemical stability, and the samples of (Bi 2 O 3 ) 0.95- x (Ho 0.4 Er 0.4 Tm 0.4 Yb 0.4 Lu 0.4 O 3 ) x (WO 3 ) 0.05 ( x = 0.1, 0.2, 0.3, 0.4) with low or mediate configuration entropies showed pure and high oxide ion conductivities, e.g. ∼2.6 × 10 −2 S/cm at 600 °C for the sample x = 0.2. Whereas, for the (Bi 2 O 3 ) 0.26 (Ho 0.5 Er 0.5 Tm 0.5 Yb 0.5 O 3 ) 0.48 (WO 3 ) 0.26 sample with high configuration entropy, pure ionic conduction occurred only within a narrow temperature range (700−750 °C) under the N 2 atmosphere. Under strong reducing condition, only the high-entropy sample (Bi 2 O 3 ) 0.26 (Ho 0.5 Er 0.5 Tm 0.5 Yb 0.5 O 3 ) 0.48 (WO 3 ) 0.26 showed high phase and chemical stabilities, but would introduce strong electronic conduction rise from the reduction of the high content W 6+ . While for (Bi 2 O 3 ) 0.95- x (Ho 0.4 Er 0.4 Tm 0.4 Yb 0.4 Lu 0.4 O 3 ) x (WO 3 ) 0.05 with low or mediate configuration, phase decompositions with impurities of Bi metal and HoH 2 were observed under strong reducing atmosphere, accompany with obviously decreased conductivities. Therefore, we provided here a comprehensive understanding for the multiple components doped Bi 2 O 3 -based materials with configuration entropy from low to high on their phases, stabilities, and electrical properties, and suggested a new strategy for designing and stabilizing bismuth-oxide-based materials.
研究领域:
材料科学
·
固体化学
·
电化学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2012
·Vol. 2
·期 27
·10330-10336
·
IF 0
Jungang Hou,Chao Yang,Zheng Wang,Shuqiang Jiao,Hongmin Zhu
Large-scale hydrogen production through water splitting using photocatalysts with solar energy can potentially produce clean fuel from renewable resources. In this work, photocatalytic hydrogen evolution with a high efficiency was achieved using CdS nanocrystal decorated CdLa2S4 microspheres (CdS/CdLa2S4) successfully prepared by a two-step hydrothermal process. The obtained CdS/CdLa2S4 composite was characterized by X-ray diffraction (XRD), electron microscopy (EM), X-ray photoelectron spectroscopy (XPS), UV-vis diffuse reflectance absorption spectroscopy (DRS), and photoluminescence spectroscopy (PL). XRD demonstrated that highly crystalline hexagonal CdS was obtained in CdS/CdLa2S4. EM results revealed that CdLa2S4 microspheres assembled from a large number of nanoprisms, were intimately enwrapped by the surrounding CdS nanocrystals with a particle size below 20 nm. This unique architecture resulted in the appropriate dispersion of CdS nanocrystals and intimate multipoint contacts between the CdS nanocrystals and CdLa2S4, which led to significant enhancement of charge separation in CdS/CdLa2S4. Especially, the CdLa2S4 microspheres decorated with 3 wt% CdS nanocrystals containing 0.4 wt% of Pt showed a high rate of H2-production at 2.25 mmol h−1 with an apparent quantum efficiency of 54% under 420 nm monochromatic light. The rate of hydrogen evolution from water splitting was 9 times faster in comparison with the rate observed on pure CdLa2S4, which is ascribed to the presence of CdS nanocrystals that alter the energy levels of the conduction and valence bands in the coupled semiconductor system.
研究领域:
材料科学
·
光催化
·
能源化学
·
纳米材料
·
半导体物理
·
可再生能源
·
催化化学
✓ 已验证
DOI
TRANSACTIONS OF TIANJIN UNIVERSITY
·
2020
·Vol. 26
·期 2
·142-147
·
IF 0
Zhang Chang,Wu Cong,Zhang Zhiwei,Shen Yanran,Liu Wei
Lithium-ion batteries (LIBs) have been developed for over 30 years; however, existing electrode materials cannot satisfy the increasing requirements of high-energy density, stable cycling, and low cost. Here, we present a perovskite-type LaNiO 3 oxide (LNO) as a new negative electrode material. LNO was successfully synthesized by a sol–gel method. The microstructure and electrochemical performance of LNO calcined at various temperatures have been systematically investigated. The LNO electrode shows a high rate capability and long cycling stability. In a C-rate test, a specific capacity of 77 mAh/g was exhibited at 6 C. LNO can also deliver a specific capacity of 92 mAh/g after 200 cycles at 1 C. This paper presents a type of binary metal oxide as a new anode material for high-performance LIBs.
研究领域:
材料科学
·
电化学
·
能源存储
·
无机功能材料
·
固态化学
✓ 已验证
DOI
危险品化学品经营许可证（带存储）