ACS Catalysis
·
2026
·
IF 13.1
Jun Zuo,Mengjia Zhu,Jiamin Liu,Juncheng He,Xiaohua Li,Tiantian Liu,Zhuangzhuang Ren,Zuoxi Zhuo,Yu Tang,Lizhi Wu,Li Tan
Chemical recycling of polyester plastics such as polyethylene terephthalate (PET), by converting them into high value-added chemical products, represents a highly promising technological approach. However, persistent challenges remain in PET conversion, including unclear structure–activity relationships of catalysts, low conversion efficiency of hydrogenation-active metals, and insufficient selectivity toward target products. In this work, we developed a high-performance Ru/xNb-BEA (BEA represents dealuminated Beta zeolite) catalyst synthesized via a simple impregnation method. The optimized 1Ru/8Nb-BEA catalyst achieved the highest turnover frequency of 63.3 h–1 with a high selectivity of >95% for cycloalkanes (among all detected products) and demonstrated stable performance over five consecutive reaction cycles (240 °C, 3 MPa H2, 12 h) but also maintained a high reaction performance in practical applications. Combined with comprehensive characterizations, the structure-performance relationship of Ru/Nb-BEA was elucidated. Nb species occupying BEA zeolite T-site vacancies form Si–O–Nb units that disperse and stabilize the Ru0 species. The synergistic effect between distinct acidic site Nb species and hydrogenation-active Ru0 species is proposed as the critical determinant for enhanced catalytic activity. Furthermore, using in situ infrared spectroscopy, we detected the presence of aromatic alcohols and aldehydes during the reaction, providing insights into the plausible reaction mechanism. This study provides valuable insights for the future design of catalysts for the hydro-deoxygenation (HDO) of PET.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2017
·
IF 9.446
Lu Jiang,Shuang Ni,Gang Liu,Xiaoxiang Xu
In this work, we have applied Cr/Nb co-doping strategy to the wide band gap semiconductor Bi 3 TiNbO 9 and have performed a detailed investigation on the structure, optical and photocatalytic properties of these modified Aurivillius compounds Bi 3 Ti 1-2x Cr x Nb 1+x O 9 (x = 0, 0.1, 0.2, 0.3). Our results suggest that Cr/Nb doping slightly expand the unit cell of Bi 3 TiNbO 9 with a doping limit around 20%. The involvement of Cr/Nb dopants in the crystal structure significantly reduces the band gap of Bi 3 TiNbO 9 by nearly 1 eV. Photocatalytic experiments and photoelectrochemical measurements confirms the critical role of Cr/Nb dopants in improving photocatalytic hydrogen production and anodic photocurrent. More than two-fold enhancement in hydrogen production has been noticed for merely 10% Cr/Nb co-doping. The highest photocatalytic activity belongs to Bi 3 Ti 0.8 Cr 0.1 Nb 1.1 O 9 (x = 0.1) for full range illumination and to Bi 3 Ti 0.6 Cr 0.2 Nb 1.2 O 9 (x = 0.2) for visible light illumination, with apparent quantum efficiency (AQE) approaching 0.52% and 0.27%, respectively. DFT calculation discloses the role of Cr in forming a new valence band inside the band gap of Bi 3 TiNbO 9 . In addition, strong anisotropic phenomenon in charge transportation of Bi 3 TiNbO 9 is also verified by DFT, as both conduction band minimum (CBM) and valence band maximum (VBM) are buried in the [BiTiNbO 7 ] 2− perovskite slabs and charges are only allowed to migrate within the slabs.
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ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Congjie Lv,Jing Yang,Yi Peng,Xiaochuan Duan,Jianmin Ma,Qiuhong Li,Taihong Wang
The effect of niobium (Nb) doping in one-dimensional (1D) nanostructured LiNi 1/3 Co 1/3 Mn 1/3 O 2 (NCM) cathode has been investigated for this study. Nb-doped NCM nanofibres have been prepared through an electrospinning method followed by controllable sintering process . X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) results confirmed that Nb-doping can effectively reduce cation mixing, thus improve the structural stability . In addition, due to the valence compensation balance, Mn 4+ ions are partially reduced to Mn 3+ ions, which can further improve the conductivity and stable cycling performance. Therefore, increased discharge capacities, high first cycle efficiencies and superior cycling and rate behaviors are observed between normal voltage limits for the Nb-doped NCM compositions in electrochemical cells . Specifically, Nb-doped NCM nanofibres achieve a high discharge capacity of 200.4 mAh/g at 0.1 C with a high Coulombic efficiency of 92.3%. Moreover, a high discharge capacity of 118.7 mAh/g even at 5 C with 83.3% capacity retention after 200 cycles is also achieved. Also, cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) results demonstrate that Nb-doping can mitigate the electrochemical polarization of NCM and improve the lithium ion diffusion coefficient , leading to the improvement of electrochemical performances . It is highly expected that our findings can provide a general approach to improve the electrochemical properties of cathode materials for lithium-ion batteries.
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JOURNAL OF RARE EARTHS
·
2026
·
IF 9.6
Mao Zhang,Jiaqing Niu,Bo-Mei Liu,Rongfu Zhou,Haijiao Xie,Yingchun Liu,Wei Liu,Rui Zou,Hui Zhang,Jing Wang
Bioimaging is essential in medical diagnostics and research, yet conventional optical methods are limited by photobleaching and background interference. Although near-infrared (NIR) persistent luminescent (PersL) materials avoid in situ excitation and autofluorescence, their signal decay and shorter-wavelength emission restrict long-term repetitive imaging. Here, we report an oxygen-vacancy-tailoring strategy in LaInO 3 :Nb,Cr, which exhibits broad NIR emission centered at 845 nm, efficient X-ray charging, and repeatable red-light recharging. Benefiting from its high-atomic-number host, LaInO 3 exhibits strong X-ray absorption, while Nb 5+ doping modulates oxygen vacancy (V O ), thereby boosting Cr 3+ NIR PersL by approximately 13 times. In vivo imaging reveals that LaInO 3 :Nb,Cr nanoparticles can be reactivated with a low X-ray dose (0.20 Gy) and repeatedly recharged in situ by red light, highlighting their potential for deep-tissue imaging. This work provides insights into defect-property relationships via ion doping and offers guidance for the rational design of PersL materials for practical applications.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Liang Dan,Hui Wang,Xiaobao Yang,Jiangwen Liu,Liuzhang Ouyang,Min Zhu
The practical applications of MgH2 as a high-density hydrogen carrier depend heavily on efficient and low-cost catalysts to accelerate the dehydriding/hydriding reactions at moderate temperatures. In the present work, this issue is addressed by synthesizing Nb-doped TiO2 solid-solution-type catalysts that dramatically improve the hydrogen sorption performances of MgH2. The catalyzed MgH2 can absorb 5 wt % of H2 even at room temperature for 20 s, release 6 wt % of H2 at 225 °C within 12 min, and the complete dehydrogenation can be achieved at 150 °C under a dynamic vacuum atmosphere. Density functional theory calculations reveal that Nb doping introduces Nb 4d orbitals with stronger interaction with H 1s into the density of states of TiO2. This considerably enhances both the adsorption and dissociation ability of the H2 molecule on the catalysts surface and the hydrogen diffusion across the specific Mg/Ti(Nb)O2 interface. The successful implementation of solid solution-type catalysts in MgH2 offers a demonstration and inspiration for the development of high-performance catalysts and solid-state hydrogen storage materials.
研究领域:
材料科学
·
催化化学
·
能源存储
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Functional Materials Letters
·
2025
·
IF 1.1
Jie Zhao,Ming Guan,Can Cui,Saifang Huang
To enhance the room-temperature lithium-ion conductivity and interfacial stability of Li 7 La 3 Zr 2 O 1 2 (LLZO) solid-state electrolytes, a co-doping strategy with Ga 3 + and Nb 5 + was employed. By systematically optimizing the sintering protocol — including heating rate, temperature, and dwell time — highly dense and phase-pure cubic-phase LLZO ceramics were successfully synthesized. The co-doping approach effectively stabilized the cubic garnet structure and regulated the lattice framework to facilitate Li + transport pathways. Under optimized conditions, compared to undoped LLZO (0.31 mS cm − 1 , 0.362 eV), the co-doped ceramic exhibited significantly enhanced total ionic conductivity (0.81 mS cm − 1 ) and reduced activation energy (0.207 eV), confirming the superior transport performance enabled by the co-doping strategy. Furthermore, the electrolyte showed good wettability and interfacial compatibility with metallic lithium, enabling stable cycling performance in symmetric Li∥Ga/Nb-LLZO∥Li cells over short durations. These results confirm the practical potential of the co-doped LLZO electrolyte in all-solid-state lithium batteries. This study provides a viable pathway for the material design and processing of high-performance LLZO-based solid electrolytes.
研究领域:
材料科学
·
固体离子学
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储能技术
·
陶瓷工艺
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JOURNAL OF ELECTRONIC MATERIALS
·
2022
·Vol. 51
·期 12
·6885-6893
·
IF 2.047
Song Angang,Cao Guoqin,Zhu Di,Zhao Baofeng,Fu Zhenya,Cao Shuaiqi,Wang Qingjie,Hu Junhua
Nb-doped TiO 2 (NTO) thin films were sputtered on glass substrate followed by a simple annealing process in air. The photoelectric cooperative optimization was discussed based on the structural, optical and electrical characteristics. The influence of oxygen flow during deposition on materials chemistry and performance was analyzed. Hall measurement showed a strong dependence of transparent conductivity on the oxygen flow. Oxygen vacancies are related to the phase transitions from the rutile to anatase TiO 2 during annealing. The chemical states of Nb, Ti and O before and after annealing were discussed. The achievement of optimized transparent conductivity was resultant from the fine-tuning of the doped chemistry and special interplay of dopants and host lattice. Graphical
研究领域:
材料科学
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薄膜技术
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固体物理
·
光电材料
·
无机非金属材料
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高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2018
·
IF 1.712
Wenjuan Yan,Yuhui Wu,Xiang Feng,Chaohe Yang,Xin Jin,Jian Shen
Selective propylene epoxidation to propylene oxide (PO) with hydrogen peroxide (H 2 O 2 ) was carried out in a catalytic semi-batch reactor. High propylene epoxidation activity (44 h − 1 ) was observed over Nb based mesoporous silicate materials Nb-TUD-1 under mild operating conditions. The physical and chemical properties of the Nb based silicates characterized using BET, FTIR, TPD , TEM and UV–Vis revealed that the site isolation and surface acidity are crucial for PO production. Catalyst synthesis methods were investigated for their effects on PO productivity, PO selectivity and H 2 O 2 utilization efficiency. It is found that Nb-TUD-1 material synthesized by the sol–gel method is more active and selective than impregnated materials for liquid phase propylene epoxidation. Surface characterization confirms that thus synthesized Nb-TUD-1 catalysts have more Lewis acidity and less Bronsted acidity compared to the catalysts by impregnation.
研究领域:
催化化学
·
材料科学
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MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2021
·
IF 3.927
Yang Ren,Haiyan He,Yunwei Wang,Ying Gong,Gaoyang Zhao
In this study, the F–Nb co-doped TiO 2 films (TFNO) were prepared on soda lime glass using the sol-gel method. Multielement doping was carried out to further improve the conductivity of Nb-doped TiO 2 (TNO) thin films by increasing the carrier concentration. The effect of fluorine doping on the microstructure, chemical composition, and optoelectronic properties of the TFNO films was investigated. The results show that the obtained films are polycrystalline with an anatase structure. Both niobium and fluorine are present in the TiO 2 films (as Nb 5+ and F − ). With increasing fluorine doping, the visible-light transmittance of the film increases slightly, and the carrier concentration continues to increase until saturation. However, the carrier mobility decreases gradually. The TFNO film exhibits the optimal optoelectronic properties, when the F:Ti atomic ratio is 0.5:1, reaching a resistivity of 0.02 Ω cm and a visible-light transmittance of 81%.
研究领域:
材料科学
·
光学
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APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2018
·Vol. 124
·期 6
·1-8
·
IF 1.604
Lin Changwei,Tang Yu,Song Jun,Han Lei,Yu Jingbo,Lu Anxian
In the present study, series of garnet-type Li 6.75+ x La 3− x Sr
x
Zr 1.75 Nb 0.25 O 12 solid electrolytes [LLSZN with various Sr contents ( x = 0.05–0.25)] have been prepared via conventional solid-state method. The effects of Sr contents on their phase structure and ionic conductivity have been systematically investigated on the combined measurements of X-ray diffraction and scanning electron microscopy and alter current impedance spectroscopy. Our results reveal that a phase transition from tetragonal to cubic structure occurs when both Sr and Nb elements is introduced, and such a cubic structure can be stable over the whole Sr contents variation, which is suggested to provide a beneficial impact on the performance of LLSZN. Accordingly, both relative density and total ionic conductivity exhibit a favorable tendency of increasing first and then decreasing with increased Sr contents, wherein a peak value at 93.46% and 5.09 × 10 −4 S cm −1 , respectively, can be well achieved. Particularly, the maximum ionic conductivity is almost twice that of the compared sample (2.93 × 10 −4 S cm −1 ), and possess the minimum activation energy ~ 0.30 eV. Such a modification method, featured with higher efficiency and lower cost, is expected to be helpful for the development of solid electrolyte.
研究领域:
材料科学
·
电化学
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Ru-Yi Chen,De-Feng Zhou,Xiao-Fei Zhu,Ning Wang,Jing-He Bai,Chun-Qi Guo,Lian Ai
Cobalt-based perovskites are widely used as cathode materials for intermediate temperature solid oxide fuel cells (IT-SOFCs) due to their excellent catalytic activities. In this paper, a series of Nb-doped La 0.5 Sr 0.5 Co 0.8 Cu 0.2- x Nb x O 3–δ (LSCCu 0.2- x Nb x O 3-δ , x = 0.00 ≤ x ≤ 0.075) cathode materials with excellent electrochemical performance are prepared by a Pechini method, and the critical Nb-doping effect is studied in detail. In the new cathode material, the surface oxygen content increases with the Nb doping, while the segregation of Sr and the coefficient of thermal expansion (TEC) is reduced. The optimum LSCCu 0.15 Nb 0.05 O 3-δ shows the highest surface oxygen content, the lowest surface Sr content, and the highest oxygen reduced reaction (ORR) catalytic activity. At 700 °C, the polarization resistance (Rp) is 0.065 Ω cm 2 , and the peak power density (PPD) of single cells supported by the electrolyte is 518 mW cm −2 , which are promising for the IT-SOFCs. Therefore, the LSCCu 0.15 Nb 0.05 O 3-δ should be a promising cathode material for the high-performance IT-SOFCs.
研究领域:
材料科学
·
能源科学
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Jianguang Xu,Zhiyong Liu,Qiang Wang,Junsheng Li,Yuxiang Huang,Mengnan Wang,Linyu Cao,Wei Yao,Haijiang Wu,Chi Chen
MXenes show promising potential in supercapacitors due to their unique two-dimensional (2D) structure and abundant surface functional groups. However, most studies about MXenes have focused on tailoring surface structures by alternating synthesis methods or post-etch treatments, and little is known about the inherent relationship between surface groups and M elements. Herein, we propose a simple and novel strategy to adjust the surface structure of few-layered MXene flakes by adding a small amount of Nb element. Because of the strong affinity between Nb and O elements, the as-received V1.8Nb0.2CTx and Ti2.7Nb0.3C2Tx MXenes have much fewer −F functional groups and a higher O content than V2CTx and Ti3C2Tx MXenes, respectively. Thus, both V1.8Nb0.2CTx and Ti2.7Nb0.3C2Tx MXenes show enhanced pseudocapacitance performance. Especially, V1.8Nb0.2CTx delivers an ultrahigh volumetric capacitance of 1698 F/cm3 at a scan rate of 2 mV/s. Moreover, benefiting from the high activity of MAX precursors obtained through a fast self-propagating high-temperature synthesis, the etching time to produce V-based MXenes is much shorter than that in previous reports. Therefore, the results presented here are applicable to the surface engineering and rational design of 2D MXene materials and develop them into promising, cost-effective electrode materials for supercapacitors or other energy-storage equipment.
研究领域:
材料科学
·
能源存储技术
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高影响因子
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