JOURNAL OF MOLECULAR LIQUIDS
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2022
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IF 6.633
Quan Chen,Lunan Wu,Xiaoli Zhao,Xiu-Jie Yang
Zn-Ti layered double oxide (LDO) nanosheets were synthesized by a simple co-precipitation-calcination process for the enhanced photocatalytic degradation of methyl orange (MO), rhodamine B (RhB) and methylene blue (MB). ZnTi-LDOs nanosheets present higher photocatalytic efficiency for MO, RhB and MB removal, which is 5.4, 4.4 and 6.7 times of that of Zn-Ti layered double hydroxide (LDH), respectively. The photocatalytic activity of synthesized ZnTi-LDOs is greatly affected by the mole ratio of Zn/Ti, calcination temperature and pH value. It is found that the formation of ZnO/ZnTiO 3 heterojunction in ZnTi-LDOs could effectively accelerate the rapid separation of charge carriers, and thus enhance the photocatalytic activity via enlarging the photoresponse range. The possible charge transfer mechanism for photocatalytic degradation of organic dyes by ZnTi-LDOs was proposed based on the active species test and UV–Vis diffuse reflectance spectra. The results of active species trapping experiments showed that ‧OH, ‧O 2 − , h + , e − all had effect on the degradation of RhB , and ‧OH played a major role. This study provides a new insight for the photocatalytic degradation of organic pollutants from wastewater by ZnTi-LDOs.
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高影响因子
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
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2022
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IF 3.752
He ZHANG,Zhi-bo LI,Xiao-chun DENG,Ben CHEN,Guo-hua ZHANG,Kuo-Chih CHOU
Ultrafine oxide dispersion strengthening (ODS)-Mo and ODS-W alloy powders containing different types of oxide nanoparticles were successfully synthesized by spraying method (solid−liquid mixing method) combined with the reductions with carbon black and hydrogen in sequence. It is concluded that the solution concentration and type of rare earth oxide have no effect on the grain size of ODS-Mo alloy powder, but have obvious effect on that of ODS-W alloy powder. The higher the concentration of rare earth solution is, the smaller the average grain size of ODS-W alloy powder is. Furthermore, compared with doping with CeO 2 , the grain sizes of reduction products of La 2 O 3 and Y 2 O 3 doped WO 3 are relatively larger. Compared with the undoped case, there is almost no change for grain size of ODS-Mo alloy powder, while the grain size of ODS-W alloy powder becomes much larger. This is probably due to the appearance of the composite oxide (such as La 2 WO 6 ) formed by the reaction between tungsten oxide and rare earth oxides, which promotes the heterogeneous nucleation and growth of tungsten grains during the reduction process of ODS-W, while there is no complex oxide composed of molybdenum and rare earth oxides in the reduction process of ODS-Mo.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Gaili Ke,Feng Duan,Binyao Liu,Xiaotian Liu,Jinyu Wen,Bi Jia,Xiaoyan Liu,Huichao He,Yong Zhou
In theory, suitable metal ions doping into the surface of BiVO 4 photoanodes could improve its water oxidation performance effectively. But the common homogeneous reaction strategy is not well applicable for the preparation of BiVO 4 film photoanodes with metal ions surface doping. Herein, a photoelectrochemical treating approach was reported to prepare BiVO 4 films with W or Mo surface doping in saturated tungstate and molybdate-containing electrolyte, respectively. The doping of W or Mo into the surface of BiVO 4 film was attributed to the following reactions. Firstly, the photocorrosion of BiVO 4 film photoelectrodes resulted in the dissolution of VO 4 3+ from BiVO 4 lattice under AM 1.5 G illumination. Then, the WO 4 2+ or MoO 4 2+ in the saturated electrolyte entered and occupied the dissolved sites of VO 4 3+ on BiVO 4 surface through ions exchange reaction . Due to the lower radiative recombination of carrier as well as higher electrocatalytic water oxidation activity, the resultant W or Mo doped BiVO 4 films as photoanodes showed better solar water oxidation activity, kinetics and stability, although their light harvesting property and morphological feature were close to the pristine BiVO 4 film photoanode. The present work provides a new and effective approach for the achievement of metal ions doping into the surface of BiVO 4 photoanodes, which could inspire the preparation of similar photoanode materials.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Guanghui Li,Changye Mang,Lang Xing,Pengxu Cao,Yongfeng Cai,Jun Luo,Hao Jiang
Methylene blue (MB) is extensively used in the textile industry; meanwhile, it is also one of carcinogenic and mutagenic pollutants. The removal of MB from wastewater by photocatalytic decomposition under visible light irradiation is a very important method. In this work, a photocatalyst of Mo-doped TiO 2 coated on fly ash cenosphere (CTAB-Mo-TiO 2 /FAC) was prepared by a sol-gel method and modified by hexadecyl trimethyl ammonium bromide (CTAB). Compared to TiO 2 /FAC and Mo-TiO 2 /FAC (without CTAB), it was featured by low bandgap and strong light absorption ability. More importantly, the light absorption range broadened from 200 to 400 nm to 200–800 nm, which could absorb visible light . Besides, after adding CTAB, the Mo 6+ could more easily dope into the TiO 2 lattice and cause crystal distortion, which exposed more oxygen vacancies . Oxygen vacancies could generate abundant reactive radicals to enhance the photocatalytic activity . At CTAB-Mo-TiO 2 /FAC dosage of 2 g/L, 99.75% of MB was removed in an initial MB concentration of 0.03 mmol/L with a pH of 7.0 under visible light irradiation of 60 min, whereas that of Mo-TiO 2 /FAC and TiO 2 /FAC was only 42 % and 24 %, respectively. The photodynamic parameter of CTAB-Mo-TiO 2 /FAC (0.066 min −1 ) is about 3 times of Mo-TiO 2 /FAC (0.023 min −1 ), 8.3 times of TiO 2 /FAC (0.008 min −1 ).
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MATERIALS & DESIGN
·
2024
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IF 7.6
Nana Zhu,Lu Zhu,Baojing Zhang,Peizhong Feng,Shiheng Li,Philipp V. Kiryukhantsev-Korneev,Evgeny A. Levashov,Xuanru Ren,Xiaohong Wang
An innovative two-step approach of self-propagating high-temperature synthesis (SHS) and spark plasma sintering (SPS) was developed to rapidly fabricate MoSi 2 and Mo(Al,Si) 2 ceramics for high-temperature anti-oxidation applications. The SHS process predominantly promoted the synthesis of high-purity and high-yield MoSi 2 and Mo(Si,Al) 2 phases in the alloyed powders. Subsequently, dense and crack-free MoSi 2 and Mo(Al,Si) 2 ceramics were produced using SPS. 1500 °C oxidation tests of the ceramics (100 h) revealed the formation of a protective SiO 2 oxide layer on the surface of MoSi 2 ceramics, while an Al-Si-O composite glassy oxide layer formed on Mo(Si,Al) 2 ceramics, which exhibited better thermal stability and lower oxygen permeability compared to the single SiO 2 oxide layer. However, an excessive Al content (>0.05 at.%) compromised the oxidation resistance due to the emergence of a Si-depleted Mo 5 (Si,Al) 3 layer with inferior oxidation resistance, which was caused by the high-temperature diffusion of Si. Therefore, via this novel two-step SHS-SPS technique compact and crack-free Mo(Si,Al) 2 ceramics can be rapidly synthesized at high temperatures. When trace amount of Al was added (0.05 at.%), Mo(Si 0.95 Al 0.05 ) 2 showed optimum high-temperature oxidation resistance.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Lin Zhang,Chenchen Wang,Yanchen Liu,Meng Ren,Juan Du,Aibing Chen,Fujun Li
Manganese-based layered oxides are one of the most promising cathode materials for sodium-ion batteries (SIBs) due to their high specific capacity and low cost of manganese and sodium. However, they are limited by the poor cycling stability caused by irreversible phase transitions and Jahn-Teller effect of Mn 3+ . Herein, Mo-doped P2-Na 0.67 Mn 1-x Mo x O 2 suppress the irreversible phase transition of P2-OP4 resulted from gliding of MnO 2 -slabs. It reveals that no phase transition occurs under high voltage via Mo elements doping into MnO 6 -layers. P2-Na 0.67 Mn 1-x Mo x O 2 displays high cyclic stability with a high capacity retention of 86.4% after 100 cycles and improved rate performance with an average working voltage of 2.61 V. The research provides a new perspective for designing novel layered oxide cathodes design toward high-performance SIBs.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2020
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IF 16.683
Peng Du,Kailong Hu,Juan Lyu,Huanglong Li,Xi Lin,Guoqiang Xie,Xingjun Liu,Yoshikazu Ito,Hua-Jun Qiu
Materials co-design of the single-atom catalytic centers and the supports can push the limits of the emerging wearable metal-air batteries. The metal single-atom catalysts are required to be bifunctional with high efficient electrocatalytic activities for both oxygen reduction and evolution reactions (ORR and OER), and preferably non-noble. The supports, on the other hand, in addition to the requirements of being free-standing, flexible and porous, are required to strongly interact with the metal species to prevent their aggregation. However, satisfying these requirements simultaneously is yet challenging. Here, a free-standing 3D nanoporous holey graphene with both N and single-atom Mo dopants is prepared. The nanoholes are created by chemical vapor deposition method on nanoporous NiMo alloy templates with their surface decorated with catalytically inert SiO 2 nanoparticles . The edge-rich graphene induced by the nanoholes facilitates the doping of pyridinic N and single-atom Mo in the fringe near the edges. The resulting N and Mo co-doped nanoporous holey graphene exhibits high bifunctional ORR and OER catalytic activities in alkaline electrolytes. The synergetic effects between N and Mo dopants are also revealed by density functional theory calculations. When incorporated in a solid-state zinc-air battery, the battery is bendable and can be continuously discharged/charged for 88 h with a high power density of 83 mW cm −2 . This work provides an efficient route to design metal single atom/cluster doped 3D freestanding nanoporous graphene as flexible electrodes.
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高影响因子
Materials Today Communications
·
2023
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IF 3.8
Jingxin Tian,Hongjun Zhang,Liwei Zhang,Dongliang Wang,Yong Huang,Elena Balashova,Boris Krichevtsov,Hua Ke
The effects of oxygen vacancies on electric properties of high valence ions (Mo/Zr/Ti) doped Bi 0.85 Nd 0.15 FeO 3 (marked as BNFM, BNFZ, BNFT) ceramics with morphotropic phase boundary (MPB) are investigated. MPB structures consisting of rhombohedral, intermediate and orthorhombic phases exist in all samples, which is confirmed by the XRD Rietveld refinements and TEM analyses. The BNFT has the maximum remnant polarization of 34.5 μC/cm 2 at 180 kV/cm, owing to its lowest paraelectric orthorhombic phase content. XPS and impedance results reveal that the BNFT ceramic has the relatively low oxygen vacancy contents and the largest impedance value, which is beneficial for the ferroelectric test. The best comprehensive properties of BNFT open wide prospects for improving BiFeO 3 -based ceramics.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2025
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IF 13.2
Wanchen Zhu,Zhongyang Luo,Feiting Miao,Longyi Liu,Akira Nakayama
Biomass hydropyrolysis (HP) vapor upgrading (VU) is highly promising for producing sustainable aviation fuel, yet challenges remain. This study focused on PdMo/γ-Al 2 O 3 and Mo/γ-Al 2 O 3 catalyzed HP-VU of biomass in a pressurized continuous fixed-bed and the reaction mechanism. The results demonstrated that the introduction of Pd enhanced the hydrodeoxygenation activity through multiple effects, including the generation of surface acidic sites, the formation of oxygen vacancies, and the effect of hydrogen spillover. Beyond this, the effects of upgrading temperature and pressure on the catalytic performance of PdMo/γ-Al 2 O 3 were also investigated. Under optimal conditions of 400 °C and 1.0 MPa, the organic phase achieved a mass yield of 12.03 wt%, with the selectivity of C4+ aliphatic hydrocarbons and monocyclic aromatic hydrocarbons reaching 77.01 %, leading to an HHV of 42.41 MJ/kg and high mass balance (98.71 %). Density functional theory calculations further provided insights into the role of defect sites in facilitating C–O/C=O bond cleavage and the contribution of Pd sites to C C bond activation. By integrating theoretical calculations with model compound experiments, the study revealed the potential reaction pathways including hydrodeoxygenation, hydrogenation, and C C coupling. This study provides practical and theoretical insights into the bimetallic-catalyzed HP-VU process of biomass.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2025
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IF 9.7
Min Xie,Xiaoying Li,Yufan Chen,Xiangyue Liao,Qiaoji Zheng,Heng Zhang,Kwok-Ho Lam,Dunmin Lin
Sodium superionic conductor (NASICON)-type phosphates cathodes have attracted considerable attention due to their high operational voltage and robust three-dimensional (3D) framework; however, the poor intrinsic electronic conductivity and low energy density hinder their broader application. Herein, a novel NASICON-type Na 3 V 1.44 Fe 0.5 Mo 0.06 (PO 4 ) 3 cathode was designed through Fe/Mo dual-doping at the V sites of Na 3 V 2 (PO 4 ) 3 and synthesized via a conventional high-temperature solid-state method. The introduction of Fe 3+ activates the V 4+ /V 5+ redox couple at a high voltage plateau (∼ 4.0 V), while also generates additional Fe 2+ /Fe 3+ and V 4+ /V 5+ redox pairs. Meanwhile, the doing of Mo 6+ creates cation vacancies, effectively modulating the electronic structure of vanadium and promoting ionic transport kinetics. Benefiting from this dual-doping strategy, the Na 3 V 1.44 Fe 0.5 Mo 0.06 (PO 4 ) 3 cathode delivers a high capacity of 123.4 mAh g −1 at 0.2C and an impressive energy density of 406 Wh kg −1 within 2.2–4.2 V. Moreover, it exhibits outstanding cycling stability, presenting a capacity retention of 92 % after 2500 cycles at 30C. This work highlights a viable strategy for advancing high-performance NASICON-type cathodes through complex metal ion doping.
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
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IF 13.3
Guangxun Sun,Shihuan Liu,Hongfu Shi,Peng Xue,Junxi Li,Wenwen Gao,Feiyang Li,Fuliang Chen,Yanpeng Fu,Zhi Liu,Yuan Pan,Yunqi Liu
Intensifying hydrogen spillover by regulating the atomic local structures catalysts is crucial for improving the hydrogenation performance, but still hugely challenging. Herein, we report a robust single-atom catalyst featuring Mo-S 4 sites in the first shell modulated with N atoms in the second shell (Mo-S 4 -N/C) by an efficient cyclodextrin supramolecular self-assembly pyrolysis strategy for intensifying hydrogen spillover in slurry-phase hydrocracking of vacuum residue (VR). We discovered that the H 2 is activated at the single-atom Mo-S 4 sites efficiently and the spillover of active hydrogen is accelerated by the reconfiguration of N species in the second shell. Remarkably, the Mo-S 4 -N/C catalyst demonstrates excellent catalytic hydrogenation activity with high turnover frequency calculated for total metals up to 0.46 s −1 , the VR per pass conversion of 61 wt.%, liquid product yield of 94 wt.%, and the low coke content of 0.6 wt.%, along with good stability, respectively. Theoretical calculations revealed that the N species in the second shell regulated the electronic structure of Mo-S 4 sites, promoting the migration of active hydrogen species by reducing the transfer energy barrier of hydrogen spillover, thus enhancing the hydrogenation performance. This work proposed a strengthened hydrogen spillover mechanism from the atomic scale for hydrogenation reaction, offering novel concepts for designing and developing high-performance hydrogenation catalysts.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
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IF 13.2
Huiyu Su,Chaofan Ma,Kechen Zhou,Chaoqi Zhu,Lu Tang,Lingfei Luo,Xiaoxia Wang,Dawen Zeng
All-solid-state batteries (ASSBs) have the advantages of wide temperature range and high energy density. However, Improper storage, transportation and use of ASSBs may produce cracks, leading the electrolytes exposed and reacting with moisture in air to generate toxic and harmful H 2 S, which seriously endangers the life and property safety of operators. Therefore, the design of an ultra-sensitive H 2 S gas sensor is expected to achieve safety warning of ASSBs. High-entropy oxides (HEOs) possess multiple cations and inherent oxygen vacancies making it’s possible for performance customization. Spinel HEOs have the advantages of low cost, simple synthesis, stable structure, and have been partially developed for gas sensing, catalysis, heat-resistant and other fields. In addition, the introduction of high-valence metals can further adjust the electronic structure, activate lattice oxygen, and bring significant performance improvements. In this work, (CoCrMnMoZn) 3 O 4 with high-valence Mo was synthesized and its morphology, structure and composition were analyzed. Through gas sensing tests, it proved to be an ideal candidate for H 2 S sensors due to its high sensitivity (1.03 to 10 ppb H 2 S), good selectivity, long-term and humidity stability. Simulation experiments show the applicability of the sensor for failure detection of ASSBs with multiple temperatures in the whole relative humidity range. Diffuse reflaxions infrared fourier transformations spectroscopy (DRIFTS) showed H 2 S was adsorbed at the Mo sites to form Mo-S bonds and decomposed into SO 2 and H 2 O. The study provides a promising approach for the safety warning of ASSBs.
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高影响因子
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