ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Guibin Zhang,Xin Wang,Yaqian Du,Jun Wang,Xuebing Yang,Ta La,Jianbo Li
SrTiO3 exhibits promising potential in both thermoelectric and optical properties. However, research on these two properties has consistently been carried out in two relatively independent fields. In this work, the regulatory mechanisms of thermoelectric and optical properties were proposed based on photon-excited electron–phonon interactions. Er doping can enhance the photon absorption of SrTiO3 by introducing impurity energy levels, thereby promoting photoexcited electron generation. The introduction of oxygen vacancies (Vo) enhances the interaction between excited electrons and phonons through defect levels, facilitating the conversion of photon energy into thermal energy and subsequently into electrical energy. Additionally, Er–Nb codoping with Vo synergistically optimizes thermoelectric properties, thereby laying a foundation for the regulation of photothermoelectric properties. As a result, significant photothermoelectric conversion was obtained in the Sr0.85Er0.15Ti0.9Nb0.1O3 (Vo) sample. A maximum ZT value of 0.32 at 1073 K was achieved in this sample, representing a 60% improvement over previously reported Nb-doped SrTiO3 samples. The electrical output power of the Sr0.85Er0.15Ti0.9Nb0.1O3 (Vo) sample reaches 3.85 μW under portable 980 nm laser excitation at 260 mW incident power. These findings provide valuable insights into the conversion of light energy to electrical energy in highly absorptive SrTiO3-based thermoelectric materials.
研究领域:
材料科学
·
热电学
·
光电子学
·
能量转换
·
固体物理
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产品关联
DOI
PubMed
高影响因子
ChemSusChem
·
2023
·Vol. 16
·期 10
·e202300067
·
IF 8.4
Wenhao Liu,Xuanpeng Wang,Jinshuai Liu,Changyuan Guo,Fan Qiao,Xiaoling Ding,Xiaobin Liao,Chunhua Han
To better satisfy the increasing demands for electric vehicles, it is crucial to develop fast-charging lithium-ion batteries (LIBs). However, the fast-charging capability of commercial graphite anodes is limited by the sluggish Li + insertion kinetics. Herein, we report a synergistic engineering of uniform nano-sized T-Nb 2 O 5 particles on graphite (Gr@Nb 2 O 5 ) with C−O−Nb heterointerfaces, which prevents the growth and aggregation of T-Nb 2 O 5 nanoparticles. Through detailed theoretical calculations and pair distribution function analysis, the stable existence of the heterointerfaces is proved, which can accelerate the electron/ion transport. These heterointerfaces endow Gr@Nb 2 O 5 anodes with high ionic conductivity and excellent structural stability. Consequently, Gr@10-Nb 2 O 5 anode, where the mass ratio of T-Nb 2 O 5 /graphite=10/100, exhibits excellent cyclic stability and incredible rate capabilities, with 100.5 mAh g −1 after 10000 stable cycles at an ultrahigh rate of 20 C. In addition, the synergistic Li + storage mechanism is revealed by systematic electrochemical characterizations and in situ X-ray diffraction. This work offers new insights to the reasonable design of fast-charging graphite-based anodes for the next generation of LIBs. Graphical Bond together : Benefiting from the C−O−Nb heterointerfaces that can effectively enhance the structure stability and facilitate electron/ion transport, composite of T-Nb 2 O 5 particles decorated on graphite exhibits low interfacial resistance, high Li + diffusion coefficient (nearly 34 times higher than graphite), and a high discharge capacity of 100.5 mAh g −1 after 10000 cycles at 20 C.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
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锂离子电池
✓ 已验证
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Daiwu Chen,Fenfang Deng,Cong Ding,Yu Wang,He Li
A novel niobium doped nickel oxide nanoparticle (NbNiO) was synthesized by sol-gel method and was applied to fabricate DNA biosensor for detection of Pb 2+ in water sample for the first time. The amino-modified G-rich DNA probes were immobilized on the surface of CH-NbNiO-MWCNTs/ITO electrode by the covalent interaction between the amino of DNA and the carboxyl of MWCNTs. When the lead (II) ion (Pb 2+ ) interacted with the G-rich DNA, it will induce the DNA conformational to switch from a random-coil to a G-quadruplex resulting in an increase of alternating current impedance. On the basis of this, we developed an impedance biosensor for the detection of Pb 2+ . The results showed that the synergistic effect of the synthesized NbNiO nanoparticles and MWCNs could improve the performance of this DNA biosensor. Under optimal conditions, the fabricated DNA biosensor possess a wide linear range of 1.0×10 -10 to 1.0×10 -5 M (correlation coefficient, R=0.998) and a low detection limit of 7.51 ×10 -12 M (3σ).
研究领域:
分析化学
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环境科学
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Haofeng Chen,Chao Liang,Suhang Xun,Zhendong Yu,Cancan Wu,Minqiang He,Huaming Li,Wenshuai Zhu
Bimetallic oxide is a potential catalyst for oxidative desulfurization of fuel. Thus, an appropriate method is needed to improve its catalytic performance. Manufacturing defect is an effective means. In this contribution, an oxygen vacancies (OVs) regulation strategy for enhancing the catalytic activity of bimetallic oxide is proposed. Density functional theory (DFT) calculations show that the crystal phase has a huge influence on the generation energy of oxygen vacancies, so a series of V-Nb mixed oxide with different crystal phases are synthesized. Detailed characterizations show that the as-prepared tetragonal V-Nb mixed oxide ( T -VNbO x ) has lower OVs formation energy and larger OVs concentration (compared to orthorhombic V-Nb mixed oxides, O -VNbO x ). Owing to the activation of OVs, the catalytic activity of T -VNbO x was significantly enhanced to form ultra-deep oxidative desulfurization. In addition, T -VNbO x can be cycled eight times without significantly degrading the desulfurization performance.
研究领域:
催化
·
材料科学
·
环境化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 30
·期 15
·14391-14404
·
IF 2.195
Yu Xuemin,Wang Junchuan,Sun Ying,Zhang Xueqin,Lin Baoping
A series of nanocomposite films loaded with various concentrations of fillers were successfully synthesized by solution casting method (BSCTZS nanoparticles (NPs) as filler and polyimide (PI) as polymer matrix). To improve the dispersion and the physical–chemical properties of (Ba 0.87 Sr 0.04 Ca 0.09 )(Ti 0.86 Zr 0.08 Sn 0.06 )O 3 (BSCTZS) NPs surface, BSCTZS NPs were modified by Al 2 O 3 coating and modified Al 2 O 3 @Nb-BSCTZS NPs/PI nanocomposite films were prepared. The prepared modified Al 2 O 3 @Nb-BSCTZS NPs were characterized by X-ray diffraction (XRD) analysis, and scanning electron microscopy (SEM), and the dielectric properties of these composites were characterized in details. As a result, the nanocomposite films filled with 5 vol% Al 2 O 3 @0.4mol%Nb-BSCTZS nanoparticles exhibit an excellent energy density of 2.11 J cm −3 at 298 kV/mm, which is 48% over the original pristine PI (1.42 J cm −3 at 313 kV/mm). This work can provide a prospective solution for the preparation of composite film materials with high dielectric constant and high energy density.
研究领域:
材料科学
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纳米技术
·
电气工程
✓ 已验证
DOI
高影响因子
RENEWABLE ENERGY
·
2022
·
IF 8.634
Yiwei Tang,Xiaoning Liu,Ran Xi,Le Liu,Xinhua Qi
As one of the important chemical feedstocks and biofuels, ethyl levulinate (EL) can be produced from biomass-derived furfural by consecutive hydrogenation, etherification and ring-opening reactions. However, this process normally requires two separate steps in different reaction systems, which is complex and energy consumption. Herein, Nb–Ni bifunctional ordered mesoporous carbons (Nb/ [email protected] ) were synthesized by a two-step process where [email protected] was firstly synthesized by a solvent evaporation induced self-assembly (EISA) process using F127 as a template agent, polyphenol gallic acid as carbon precursor and Ni 2+ as cross-linker, following with the supporting of Nb species in the [email protected] by an incipient wetness impregnation method. The as-synthesized Nb/ [email protected] samples were applied for the one-pot catalytic transformation of furfural to EL, and exhibited good activity with the highest EL yield of 83% under an optimized condition. Two possible pathways for the one-pot production of EL were proposed according to two intermediates: (1) hydrogenation of furfural to form furfuryl alcohol (FFA) that is then etherified with ethanol to form 2-(ethoxymethyl)furan (2-EMF); and (2) acetalization and etherification of furfural with ethanol to produce 2-(diethoxymethyl)furan (2-DMF). Then both 2-DMF and 2-EMF are converted to EL through acid catalyzed ring opening reaction. The dominant reaction pathway varied with the properties of the catalyst and the applied reaction conditions.
研究领域:
化学工程
·
催化
·
材料科学
·
生物燃料
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2018
·
IF 4.521
Xiaoqiang Wang,Yue Liu,Qingji Ying,Weiyuan Yao,Zhongbiao Wu
In this paper, a series of Nb modified Cu-Ce-Ti mixed oxides (Nb y CCT) were synthesized using wetness impregnation method for the selective catalytic reduction of NO with ammonia (NH 3 -SCR). The activity tests indicated that Nb y CCT catalysts had shown superior SCR performances. Among which, Nb 0.05 CCT catalyst exhibited a NO conversion of more than 90% within a broad operation temperature window (180–360 °C) under the GHSV of 40,000 h −1 . After that, corresponding characterizations were performed to correlate the physical structures and surface properties to catalytic performances. These results revealed that the strong interactions among the active phases induced by Nb addition could not only enhance the redox property of the catalysts but also inhibit the over-oxidation of NH 3 , which would be beneficial to SCR performance within a wide temperature range and good reaction selectivity. Furthermore, DRIFTS results suggested that the doping of Nb could promote the formation of NO 2 , thereby enhancing the “fast” SCR reaction process (Langmuir-Hinshelwood reaction pathway). Moreover, the Nb 0.05 CCT catalyst showed a better sulfur tolerance compared to Nb free catalyst that over 85% NO conversion could be retained after 12 h SCR reaction in the presence of SO 2 and H 2 O.
研究领域:
催化
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2021
·
IF 3.171
Hao Zhou,Qi Yin
The construction of efficient photocatalysts has received much attention in wastewater treatment . In this study, Nb-doped NaTaO 3 was prepared with different doping ratio by a facile hydrothermal method. The prepared catalysts were analyzed by X-ray diffraction, scanning electron microscopy, Brunauer-Emmett-Teller (BET) theory, ultraviolet–visible diffuse reflectance spectroscopy. Then the synthesized catalysts were employed to degrade a model pollutant, methylene blue (MB), under a 250 W mercury lamp. The characterization tests confirm that Nb was successfully doped into the crystal structure of NaTaO 3 and the modified NaNb x Ta 1− x O 3 ( x is the doping ratio; x = 0.25, 0.5, 0.75) samples were formed, which were in regular cubic shapes just like pure NaTaO 3 . The synthesized NaNb x Ta 1− x O 3 ( x = 0.25, 0.5, 0.75) had improved specific surface area and narrowed band gaps compared with pure NaTaO 3 . In photocatalytic degradation experiments, NaNb 0.75 Ta 0.25 O 3 presented the best photocatalytic activity ascribed to the narrow band gap and the high surface area, degradating 95.7% of MB after 180 min of reaction, which was even twice the ability of pure NaTaO 3 . Besides, the effects of possible inorganic anions and cations in wastewater on photocatalytic degradation were investigated. Electron spin resonance (ESR) tests and capture experiments were also conducted and a possible photocatalytic mechanism was proposed. This work provides a direction for constructing superior NaTaO 3 -based photocatalysts to be widely utilized in environmental protection.
研究领域:
环境科学
·
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
Catalysts
·
2025
·Vol. 15
·期 6
·545
·
IF 4
Xiaohong Yao,Jian Zhang,Chao Long
This study explored how pore size engineering in Nb-Mn/MCM-41 catalysts affects plasma-catalytic toluene oxidation. Adjusting the pore diameter (2.49–3.98 nm) modulated metal-support interactions and oxygen dynamics, with pore expansion to 3.73 nm (M3) optimizing the Mn4+/(Mn2++ Mn3+) ratio (XPS: 36.8%), the amount of lattice oxygen species (O2-TPD: 0.222 mmol/g), and crystallite size control (1.5 ± 0.2 nm, TEM). Smaller pores (M1: 2.49 nm) enhanced toluene adsorption but limited active site accessibility, while oversized pores (M4: 3.98 nm) reduced oxygen storage capacity (0.600→0.412 mmol/g). The Nb-Mn/M3 catalyst achieved superior performance with 96.8% toluene conversion, 55.0% CO2selectivity, and 85.4% carbon balance, while minimizing organic byproducts (GC-MS). Mechanistic studies revealed pore-mediated oxygen storage-transport cycles as critical for decoupling adsorption and oxidation steps. This study reveals fundamental mechanisms linking pore architecture to plasma-catalytic synergy in toluene oxidation, offering critical insights for the systematic design of energy-efficient, plasma-catalytic systems targeting industrial VOCs remediation.
研究领域:
催化化学
·
环境化学
·
材料科学
·
等离子体化学
·
纳米技术
·
表面科学
✓ 已验证
产品关联
DOI
高影响因子
Surfaces and Interfaces
·
2025
·
IF 6.3
Xiaohong Yao,Jian Zhang,Chao Long
This study explored how the Si/Al ratio in Nb-Mn/MCM-41 catalysts affect toluene degradation via plasma catalysis. Adjusting the Si/Al ratio altered catalyst acidity and redox properties, decreasing the Si/Al ratio led to increased acidity, higher Mn 3+ /Mn 4+ ratio and greater O ads /O lat ratio as indicated by NH 3 -TPD, XPS, and O 2 -TPD analysis. Lower Si/Al (Nb-Mn/M(25)) boosted toluene removal efficiency to 98.2% under dry conditions due to increased oxygen vacancies and acidity. Moderate humidity enhanced conversion, but higher humidity levels proved detrimental, especially for low Si/Al catalysts. At a humidity level of 3.11 vol%, the toluene removal efficiency of Nb-Mn/M(25) exhibited a reduction of 15.3%, while Nb-Mn/M(200) with higher Si/Al ratio decreased only by 3%. Hydrophobic, higher Si/Al catalysts showed better resistance to humidity's negative impact. These findings offered insights into designing efficient catalysts for VOC removal by optimized Si/Al ratio and managing humidity.
研究领域:
环境催化
·
材料科学
·
化学工程
·
等离子体化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2022
·
IF 10.319
Tao Xiang,Peng Du,Zeyun Cai,Kun Li,Weizong Bao,Xinxin Yang,Guoqiang Xie
The contradiction between the strength and ductility of metallic materials is a major scientific problem that has been researched for a long time. Dual-phase equiatomic and non-equiatomic Ti-Zr-Nb-Ta high-entropy alloys (HEAs) with super-high strength and excellent ductility have been successfully developed via mechanical alloying (MA) combined with spark plasma sintering (SPS) technology. This is adjusted by altering the atomic ratios of the different phases. X-ray diffraction (XRD) and transmission electron microscopy (TEM) were performed to confirm the dual-phase microstructure. After the SPS process, the average grain size of the aforementioned equiatomic Ti 25 Zr 25 Nb 25 Ta 25 HEAs (134 ± 50 nm) evaluated by electron back-scattering diffraction (EBSD) is smaller than that of the Ti-Zr-Nb-Ta HEAs (150 µm), which were fabricated using arc melting. According to the Hall-Petch formula, the grain boundary strengthening contribution in the Ti-Zr-Nb-Ta system is 33-fold higher than those fabricated using the arc-melting process. When the alloy phase comprises the equivalent dual-phase, equiatomic Ti 25 Zr 25 Nb 25 Ta 25 HEAs have good comprehensive performance compared to non-equiatomic Ti-Zr-Nb-Ta HEAs prepared using the same process. The yield strength of equiatomic Ti 25 Zr 25 Nb 25 Ta 25 HEAs (2212 ± 38 MPa) is two-fold higher than that of Ti-Zr-Nb-Ta HEAs (1100 ± 90 MPa) fabricated via arc melting. This can be attributed to the ultra-fine grain size. Notably, the equiatomic Ti 25 Zr 25 Nb 25 Ta 25 HEAs possess approximately the same biocompatibility as commercial pure Ti (CP-Ti), indicating that the equiatomic Ti 25 Zr 25 Nb 25 Ta 25 HEAs are provided with a possibility as an advanced biomaterial for the applications of the medical field.
研究领域:
材料科学
·
冶金学
·
生物材料工程
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2024
·
IF 5.5
Shulin Li,Qiaoquan Lin,Han Yan,Qiaodong Li,Yu Yang,Xinlin Yan,Zhenyu Wang,Chuang Yu,Long Zhang
Cl-rich Li-argyrodites are one type of sulfide solid electrolytes (SSEs) with a high ionic conductivity and suitable mechanical properties for practical application. However, their tolerance against moisture in air and compatibility with metallic Li need further improvements. Here, we demonstrate that Nb-O dual-doping can be a good strategy for advanced Cl-rich Li-argyrodite SSEs, prepared by high energy ball milling and annealing method. Our results show that the Nb-O co-doping enhances the interface compatibility towards metallic Li and improves the moisture resistance, while maintains a fast ion transport. The Nb-O incorporation improves the Young's modulus and mitigates the side reaction of Li-argyrodite with Li. The doping-optimized sample demonstrates a high critical current density of 2.28 mA cm −2 and a long-term Li plating/stripping stability under a relatively high current density (1 mA cm −2 ) for nearly 3000 cycles. Notably, the corresponding all-solid-state lithium batteries (ASSLBs), using a Li metal electrode, can maintain a superior cycling stability for over 1000 cycles at 1 C.
研究领域:
材料科学
·
电化学
·
电池技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）