JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Yongjie Zhou,Cheng Liu,Xinlin Wei,Junxiao Liu,Liang Shi,Hao Li,Yuanxun Li,Huaiwu Zhang
In this study, BaZnP 2- x Mo x O 7+ x /2 (BZPM x , 0 ≤ x ≤ 0.03) ceramics were successfully sintered at low temperatures via the solid-state reaction. Rietveld refinement, surface morphology characterization, and Raman spectroscopy were employed to clarify the effects of Mo 6 + substitution on the crystallology and microstructure evolution of the BZPM x ceramics. Dielectric properties were evaluated in both microwave and terahertz frequencies. Optimal microwave dielectric properties were obtained at x = 0.02, sintered at 825 ℃ for 4 h: ε r = 8.073(±0.012), Q×f = 73,172(±1187) GHz (@13.687 GHz), and τ f = -31.9(±1.6) ppm/℃. Compared with the pure BaZnP 2 O 7 ceramic sintered at 875 ℃ ( Q×f = 47,984 GHz and τ f = −40.2 ppm/℃), the incorporation of Mo 6+ could reduce the dielectric loss and improve the thermal stability while reducing the sintering temperature simultaneously. In the terahertz frequency range of 0.2 ∼ 1.2 THz, the ε r values decreased to 5.35 ∼ 7.24 while the tan δ values were within the range of 0.0105 ∼ 0.0319. All experimental results indicated that the BZPM x ceramics are promising for LTCC devices in both microwave and terahertz frequencies.
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JOURNAL OF POWER SOURCES
·
2026
·
IF 8.4
Yuhan Wang,Yihao Qu,Min Yu,Ji Yang
Proton-exchange-membrane water electrolysers require active and stable anodic oxygen evolution catalysts. RuO 2 offers high intrinsic activity but dissolves rapidly in acid. Here, high-valence molybdenum is introduced into rutile RuO 2 to regulate the local Ru-O chemical and electronic environment. The sample labels Mo-x-RuO 2 refer to nominal Mo/(Mo + Ru) precursor ratios. XRD, EDS, XPS and DFT analyses support Mo incorporation within the rutile framework and reveal an altered local Ru/O chemical environment, providing insights into the electronic regulation induced by Mo incorporation. Mo-17-RuO 2 requires 207 mV at 10 mA cm −2 , with a Tafel slope of 56.2 mV dec −1 . After 75 h of acidic half-cell operation, it shows 6.64% cumulative Ru dissolution based on the nominal initial Ru loading. The commercial RuO 2 reference exhibited 27.95% cumulative Ru dissolution after approximately 17 h of operation. For the selected computational models, the AEM- and LOM-like pathways exhibit comparable thermodynamic limiting steps, with theoretical overpotentials of 275 and 262 mV, respectively, suggesting that Mo incorporation modulates oxygen reaction energetics without exclusively favoring a single pathway. These findings provide insight into composition-dependent Mo engineering for improving the performance and Ru retention of acidic OER catalysts.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Xianglong Zhang,Xiao Fengb,Wei Zhou,Huai Liu,Wenlong Jia,Dan Li,Rui Zhang,Lincai Peng
The catalytic conversion of concentrated glucose to mannose is of considerable interest due to the latter's therapeutic value, yet it is constrained by low catalytic efficiency. Herein, a Mo/NC-300 catalyst was constructed by introducing active Mo species into a nitrogen-doped carbon (NC) matrix via pyrolysis. The resulting catalyst demonstrated outstanding activity in the epimerization of high-concentration glucose (50 wt%) to mannose, achieving a high yield of 33.4 % and selectivity of 94.6 %, alongside an excellent productivity of 123.7 mmol·g cat −1 ·h −1 . Catalyst characterizations and density functional theory calculations revealed that the NC layer modulates the electronic structure of Mo species, shifting the d-band center upwards. This preferentially enhances glucose adsorption and lowers the epimerization energy barrier. Isotope labeling experiments further confirmed the reaction follows an intramolecular 1,2‑carbon shift mechanism. The catalyst also exhibited excellent stability and reusability, primarily attributed to the hydrophobicity imparted by the NC layer. This work not only provides a catalytic system that simultaneously overcomes the challenges of concentration, stability, and efficiency, but also offers insights into the role of electronic metal-support interaction in glucose epimerization.
研究领域:
催化化学
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材料科学
·
绿色化学
·
理论与计算化学
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碳水化合物化学
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DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Juanjuan Wang,Yuxuan Xiao,Jinxian Feng,Chunfa Liu,Lun Li,Youpeng Cao,Chengcheng Zhong,Ziwen Feng,Wendi Zhang,Zhi-Quan Liu,Hui Pan
The development of efficient and durable electrocatalysts for the hydrogen evolution reaction (HER) in alkaline media remains a major challenge due to sluggish reaction kinetics and structural instability of non-noble metal catalysts. Herein, we report a phosphorus-incorporated cobalt molybdate (CoMoO-P) catalyst for regulating the dynamic reconstruction process of Mo-based materials during alkaline HER. Notably, the incorporated P not only enhances electron density at Mo/Co active sites to optimize intermediate adsorption but also regulates the Mo leaching-redeposition dynamics, distinguishing from prior P-doping strategies with a focus solely on electronic modulation. Importantly, the controlled leaching of Mo facilitates the Co(OH) 2 formation that enhances HER kinetics. As a result, CoMoO-P delivers a low overpotential of 42 mV at 10 mA cm −2 and exhibits outstanding durability at various current densities of 100, 500, and 1 A cm −2 for total of 500 h. This study offers a promising strategy for regulating catalyst reconstruction and advancing the design of high-performance non-noble metal HER electrocatalysts.
研究领域:
电化学
·
材料科学
·
催化
·
能量转换
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高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Wucan Liu,Junxing Wang,Xiang Sun,Ming Cheng,Jiamin Jin,Dang-Guo Cheng,Fengqiu Chen
Vinylidene fluoride (VDF) is a fundamental fluorinated olefin in the fluorochemical industry, and innovation in its production holds significant importance for sustainable development. Traditional routes involving the dehydrohalogenation or dehalogenation of halogenated alkanes suffer from issues such as substantial waste emissions and severe equipment corrosion. The one-step catalytic dehydrogenation of 1,1-difluoroethane (HFC-152a) to produce VDF offers notable advantages. To accomplish this goal, this work innovatively aims to construct an oxidative dehydrogenation system with a highly dispersed Mo/Ti catalyst for HFC-152a. Through systematic characterization techniques, such as XPS, XRD, Raman spectroscopy, and TPD, the reaction mechanism is thoroughly investigated. These results prove that more abundant O2– species are related to improved activity, achieving 21.1% VDF selectivity and modest stability for at least 20 h.
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PubMed
高影响因子
INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Ning Li,Wenwen Zhao,Linping Li,Yangqin Gao,Lei Ge
Photocatalysts with hollow structures have drawn great interest owing to their high specific surface area, which can enhance the photocatalytic performance. Herein, we designed the hollow cubic Cu2–xS@Ni–Mo–S nanocomposites by vulcanizing from the Cu2O template and loading the Ni–Mo–S lamellas. The Cu2–xS@Ni–Mo–S composites greatly improved the photocatalytic hydrogen performance. Among them, Cu2–xS–NiMo-5 achieved the optimal photocatalytic rate of 1326.07 μmol/g h, which is approximately 3.85 times higher than that of hollow Cu2–xS (344 μmol/g h) and had good stability for 16 h. The enhanced photocatalytic property was attributed to the metallic behavior of bimetallic Ni–Mo–S lamellas and the LSPR (localized surface plasmon resonance) effect of Cu2–xS. The bimetallic Ni–Mo–S can effectively capture the photogenerated electrons and quickly transfer-diffuse to produce H2. Meanwhile, the hollow Cu2–xS not only provided many more active sites to take part in the reaction but also introduced the LSPR effect to increase the solar utilization. This work provides valuable insights into the synergistic effect of using non-precious metal co-catalysts and the LSPR materials to assist in the photocatalytic hydrogen evolution.
研究领域:
材料化学
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光催化
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能源科学
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纳米材料
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半导体物理
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可再生能源
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表面科学
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International Journal of Minerals Metallurgy and Materials
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2022
·Vol. 29
·期 11
·2012-2019
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IF 3.85
Hu Weiqiang,Gong Fengming,Liu Shaocun,Tan Jing,Chen Songhua,Wang Hui,Ma Zongqing
The oxide dispersion strengthened Mo alloys (ODS-Mo) prepared by traditional ball milling and subsequent sintering technique generally possess comparatively coarse Mo grains and large oxide particles at Mo grain boundaries (GBs), which obviously suppress the corresponding strengthening effect of oxide addition. In this work, the Y 2 O 3 and TiC particles were simultaneously doped into Mo alloys using ball-milling and subsequent low temperature sintering. Accompanied by TiC addition, the Mo−Y 2 O 3 grains are sharply refined from 3.12 to 1.36 µm. In particular, Y 2 O 3 and TiC can form smaller Y−Ti−O−C quaternary phase particles (∼230 nm) at Mo GBs compared to single Y 2 O 3 particles (∼120 nm), so as to these new formed Y−Ti−O−C particles can more effectively pin and hinder GBs movement. In addition to Y−Ti−O−C particles at GBs, Y 2 O 3 , TiO x , and TiC x nanoparticles (<100 nm) also exist within Mo grains, which is significantly different from traditional ODS-Mo. The appearance of TiO x phase indicates that some active Ti within TiC can adsorb oxygen impurities of Mo matrix to form a new strengthening phase, thus strengthening and purifying Mo matrix. Furthermore, the pure Mo, Mo−Y 2 O 3 , and Mo−Y 2 O 3 −TiC alloys have similar relative densities (97.4%–98.0%). More importantly, the Mo−Y 2 O 3 −TiC alloys exhibit higher hardness (HV 0.2 (425 ± 25)) compared to Mo−Y 2 O 3 alloys (HV 0.2 (370 ± 25)). This work could provide a relevant strategy for the preparation of ultrafine Mo alloys by facile ball-milling.
研究领域:
材料科学
·
金属合金制备
·
微观结构调控
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SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2020
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IF 6.984
Xue Yu,Shuying Cheng,Qiong Yan,Junjie Fu,Hongjie Jia,Quanzhen Sun,Zhiyuan Yang,Sixin Wu
Cation substitution has an important impact on the power conversion efficiency (PCE) of Cu 2 ZnSn(S,Se) 4 (CZTSSe) solar cells. Herein, a significant PCE enhancement of flexible indium-doped CZTSSe solar cells has been achieved by partially substituting Sn 4+ with In 3+ . Systematic measurements indicate that In doping in CZTSSe film effectively improves the crystallinity and carrier concentration of the absorber layer . Meanwhile, the treatment reduces interface recombination and band tailing by passivating deep defects and increases the open-circuit voltage ( V oc ) of the solar cells. By physical analysis, the key parameters for the solar cell diode such as A , J 0 , R s and R sh are significantly improved after In-doping, indicating better PN junction quality. Under the optimal In-doping (x = In/(Sn + In) = 9%), the flexible Cu 2 ZnSn 1- x In x (S,Se) 4 solar cell has been successfully obtained with the best efficiency of 7.19% and the V oc enhancement of 62 mV due to reduced V oc deficit and band tailing.
研究领域:
材料科学
·
半导体物理
·
光伏技术
·
无机功能材料
·
能源材料
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高影响因子
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
·
2021
·
IF 3.871
Weiqiang Hu,Zongqing Ma,Zhu Qian,Jin Wu,Ji Dong,Hui Wang,Yongchang Liu
The Mo based alloys with minor Ti additive were fabricated by successive processes of simple ball-milling and low-temperature sintering. Different from traditional titanium oxides additive, the minor Ti additive will adsorb nearby oxygen impurities to form TiO 2 or Ti 8 O 15 during above process, thus purifying Mo matrix. The size of formed titanium oxides (approximately 540 nm) is also close to that reported in relevant literatures. What's more, the Ti additive could availably refine the Mo powder particles during ball-milling process and improve its sintering activity. While maintaining high densit (> 99%), the sintered Mo based alloys with minor Ti additive possess finer grain (13.17 μm → 4.44 μm) and higher hardness (249 HV 0.2 → 332 HV 0.2 ) compared with pure Mo.
研究领域:
材料科学
·
冶金学
·
机械工程
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高影响因子
Catalysis Science & Technology
·
2026
·
IF 4
Jian Yang,Fan Lin,Shaojie Lei,Zichen Li,Hui Zhang,Zhibao Huo,Dezhang Ren
The development of efficient and low-energy-consumption electrocatalytic decarboxylation (Kolbe electrolysis) is of great significance for the conversion of biomass-derived carboxylic acids into high-grade hydrocarbon fuels. RuO2 is considered a promising anode material. However, its intrinsic high activity towards the oxygen evolution reaction (OER) poses challenges in terms of reaction selectivity and high driving potentials in practical applications. This study investigated the modulation of RuO2 electrode performance through the systematic screening of various metal dopants (Mo, Ta, Zr, W, Sn). Results show that while doping generally enhances OER, certain dopants sustain decarboxylation under high potentials by suppressing OER via hydrocarbon product coverage. Among them, the Mo-doped RuO2 coating improved decarboxylation selectivity and Faradaic efficiency to some extent while facilitating product desorption to inhibit interface resistance increase. By further optimizing the doping ratio and calcination temperature, the resulting RuO2-5%Mo anode achieved a remarkable reduction in cell voltage (by approximately 1 V) in the presence of OA during constant-current electrolysis, leading to a ~20% decrease in energy consumption per unit product compared to undoped RuO2, alongside good stability over 10 cycles. This work provides new material design strategies and mechanistic insights for developing Kolbe electrolysis anodes with high selectivity and low energy consumption.
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高影响因子
SOLID STATE SCIENCES
·
2023
·
IF 3.5
Guo-li Chen,Huai-yao Wang,Yong-zhi Liu,Xiao-ming Huang,Guang-ming Yin
In this paper, nanowool ball Ni 3 Se 2 , rod NiSe and multistage Ni 3 Se 2 were prepared. Multilevel Ni 3 Se 2 was doped with Fe, Co and Mo respectively to prepare composite catalysts. The prepared materials were characterized by UV, XRD, SEM-EDS and XPS . The results show that the composite catalysts with multi-level Ni 3 Se 2 and Mo have special morphology and high purity. The HER performance of the composites was tested using an electrochemical workstation, and the results show that at a current density of 10 mA cm −2 , the overpotentials of Ni 3 Se 2 , Ni 3 Se 2 /Fe, Ni 3 Se 2 /Co and Ni 3 Se 2 /Mo are 71, 71, 3 and 37 mV, respectively; At a current density of 100 mA cm −2 , their overpotentials are 396.9, 373.6, 321.8 and 290.1 mV, respectively. Their Tafel slopes are 227, 169, 145 and 137 mV dec −1 , respectively. The R ct s of Ni 3 Se 2 , Ni 3 Se 2 /Fe, Ni 3 Se 2 /Co and Ni 3 Se 2 /Mo are 1.63, 1.47, 1.15 and 0.90Ω, respectively. After the comparison of the electrochemical HER performance, it is found that the Ni 3 Se 2 /Mo composite catalyst has good HER performance.
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Petroleum Science
·
2023
·
IF 5.6
Wei-Wei Feng,Ye-Gui Qian,Ting-Hai Wang,Qing-Yan Cui,Yuan-Yuan Yue,Pei Yuan,Xiao-Jun Bao
To deeply understand the effects of support properties on the performance of Mo-based slurry-phase hydrocracking catalysts, four Mo-based catalysts supported on amorphous silica alumina ( ASA ), γ -Al 2 O 3 , ultra-stable Y (USY) zeolite and SiO 2 were prepared by the incipient wetness impregnation method, respectively, and their catalytic performances were compared in the vacuum residue (VR) hydrocracking process. It is found that the Mo/ASA catalyst exhibits the highest VR conversion among the different catalysts, indicating that both the appropriate amount of acid sites, especially B acid sites and larger mesoporous volume of ASA can enhance the VR hydrocracking into light distillates. Furthermore, Mo catalysts supported on the different supports show quite different product distributions in VR hydrocracking. The Mo/ASA catalyst provides higher yields of naphtha and middle distillates and lower yields of gas and coke compared with other catalysts, it is attributed to the highest MoS 2 slab dispersion, the highest sulfuration degree of Mo species, and the most Mo atoms located at the edge sites for the Mo/ASA catalyst, as observed by HRTEM and XPS analyses. These features of Mo/ASA are beneficial for the hydrogenation of intermediate products and polycyclic aromatic hydrocarbons to restrict the gas and coke formation.
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高影响因子
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