ACS Applied Nano Materials
·
2021
·
IF 5.097
Jin Song,Fenglong Wu,Yulun Lu,Xinyan Zhang,Zhiwan Li
The effective separation of electron–hole pairs of the support plays an important role in improving the activity of a supported photocatalyst under visible-light irradiation. Herein, we constructed a CeVO4/CeO2 type-II heterojunction with strong electronic interactions and rich oxygen vacancies due to only minor lattice mismatch by the significantly changed crystal structure of two materials in the absence of an additional structure-directing agent in the calcination process. The CeVO4/CeO2 nanocomposites as supports for Co nanoparticles (NPs) exhibited remarkable photocatalytic performance for H2 evolution from ammonia borane (NH3BH3) at 25 °C. Experimental results clearly showed that a Co catalyst with a CeVO4/CeO2 nanocomposite in a 2:1 mol ratio had the best photocatalytic performance with a total turnover frequency (TOF) value of 90.9 min–1. The structure characterizations indicated that the excellent H2 evolution performance was attributed to the formation of type-II heterojunction with strong electronic interactions and rich oxygen vacancies between CeVO4 and CeO2 by the conversion of the crystal structure of two materials in the calcination process, which accelerated the separation and migration of electron–hole pairs, leading to increased electron density of Co NPs. This work underlines the importance of heterojunction construction and paves a way to designing heterostructure catalysts for photocatalytic H2 production from NH3BH3 under light irradiation with a wavelength range of 420–780 nm.
研究领域:
材料科学
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化学
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光催化
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能源材料
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纳米技术
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DOI
高影响因子
IONICS
·
2023
·Vol. 30
·期 3
·1457-1467
·
IF 2.8
Xu Wengang,Zhang Xiaonan,Li Junhao,Chen Xiaobo,Lan Lin,Zhang Jun,Ling Francis Chi-Chung,Ru Qiang
The scaffolded hierarchical CeVO 4 /V 2 CT x -MXene composite is harvested to boost the performance of vanadium oxides in aqueous zinc-ion batteries. Benefiting from the high electronic-ion conductivity of V 2 CT x -MXene and the multilayered structure of the composite, CeVO 4 /V 2 CT x -Mxene cathode depicts the advantages of the acceptable zinc storage and ionic reaction kinetics. Compared with pure CeVO 4 , CeVO 4 /V 2 CT x -MXene cathode shows a reversible discharge capacity of 295.0 mAh g −1 at 1 A g −1 , capacity retention of 81.6% over 3000 cycles at 5 A g −1 , and good high-rate performance of 233.5 mAh g −1 at 8 A g −1 . The quasi-solid-state batteries of CeVO 4 /V 2 CT x -MXene demonstrate well mechanical deformability and good cycling performance. This work provides a reference for solving the problem of vanadium-based materials for aqueous zinc-ion batteries.
研究领域:
材料科学
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能量存储
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电化学
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DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2026
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IF 9.2
Zeming Yuan,Yize Sun,Chenxu Liu,Tingting Zhai,Xia Li,Zhonggang Han,Yanghuan Zhang
A novel catalyst of Ni/CeVO 4- x @NC (nano carbon) was prepared via the coprecipitation-reduction method and then ball-milled with MgH 2 . During the precipitation process, elemental Ni was formed in situ. The catalyst was characterized to have a multiphase structure, with CeVO 3 as the main phase coexisting with the CeVO 4 phase; the latter contains abundant oxygen vacancies (denoted as CeVO 4- x ). Oxygen vacancy defects facilitate the efficient dissociation of MgH 2 and exert a synergistic catalytic effect with metallic Ni, as well as multivalent Ce and V species. The MgH 2 + 4 wt% Ni/CeVO 4- x @NC composite absorbs 5.36 wt% H 2 within 2 min at 553 K and releases 5.71 wt% H 2 within 78 min. This composite exhibits an initial hydrogen desorption temperature of 465 K, which contributes to the reduction of MgH 2 's thermodynamic stability. First-principles calculations were performed on the MgH 2 + Ni/CeVO 3 @NC model, encompassing the states of the composite both before and after hydrogen absorption and desorption. It was found that the introduction of metallic Ni provides additional quantum states and active sites for electron migration, thereby enhancing the electron transfer capability of the composite surface.
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DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 18
·14552-14558
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IF 3.289
Jimin Hou,Huihan Huang,Zhizhong Han,Haibo Pan
CeVO4 nanorods (NRs) were successfully synthesized via a one-step hydrothermal method using disodium edentate (EDTA) as a chelating agent. The CeVO4 NRs are assigned to the zircon-type tetragonal structure and exhibited pure single-crystals as determined by XRD analysis. FE-SEM images indicate that the as-prepared samples are present as square-section nanorods, and the length and sectional size of the CeVO4 NRs are found to be ∼1.5 μm and ∼100 nm, respectively. Moreover, the HRTEM images and SAED diffraction patterns confirm that the main exposed surfaces of the CeVO4 NRs were the (010) and (004) lattice planes with a high exposed percentage (ca. 96.77%) around the NRs and the growth direction was along the (200) lattice plane. The CeVO4 NRs presents a pure phase, with no other impurity phases identified from the FTIR and Raman spectra. XPS results indicate that the vanadium atoms on the surface exhibit a mixture of valence states, i.e., pentavalent state (V5+) and trivalent state (V3+), as dangling bonds around the oxygen vacancies were induced by EDTA desorption during hydrothermal process. An acetone gas sensor based on the CeVO4 NRs was fabricated, which exhibits a significant response (0.5 s) and recovery (80 s) with high selectivity at the optimum working temperature (108 °C). This is mainly due to the presence of the trivalent states (V3+), which serve as the active sites and provide a large number of oxygen vacancies (Vo) as identified by XPS and infrabar experiments at 300 ppm O2 (0.003 atm). Moreover, it has been demonstrated that the response to acetone for the gas sensor was crucially dependent on the adsorbed oxygen (Oads) on the (010) or (004) facets of the CeVO4 NRs, where the redox reaction with acetone occurred reversibly.
研究领域:
材料科学
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化学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
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IF 15.1
Jianghua Huang,Baikang Zhu,Debin Song,Bohong Wang,Lihui Chen,Lu Lu,Qingguo Chen,Limei Gai,Chunyang Zhai,Li Chen,Hengcong Tao
The construction of S-scheme heterostructure is a prospective strategy to remove polycyclic aromatic hydrocarbons (PAHs) from simulated seawater. In this study, a novel Bi 2 S 3 /CeVO 4 S-scheme heterojunction photocatalyst was prepared by solvent thermal method. The successful construction of S-scheme heterostructure is beneficial to the separation and migration of photogenerated carriers, thus achieving excellent redox capacity and efficient production of free radicals, which is conducive to promoting the photocatalyst to transform pollutants into H 2 O, CO 2 . In pure water, the optimized Bi 2 S 3 /CeVO 4 heterojunction (Bi/Ce-30) achieved a high degradation efficiency (97.39 %) for naphthalene (NAP). In simulated seawater, the degradation efficiency of NAP still reaches 87.20 % ( k = 0.01653 min −1 ), which is 7.58 folds higher than pure CeVO 4 . Furthermore, the effect (such as solution pH, pollutant concentration, etc.) on the photocatalytic performance of Bi 2 S 3 /CeVO 4 heterojunction was investigated. The possible photocatalytic degradation processes of NAP were qualitatively analyzed using 3D fluorescence spectroscopy and HPLC-MS to reveal the major degradation pathways. In addition, toxicity assessment software was used to demonstrate the gradual decrease in toxicity of the intermediate products. Furthermore, we elucidated the possible photocatalytic mechanism of Bi 2 S 3 /CeVO 4 S-scheme heterojunction for the degradation of NAP. This work provides new insights into the realization of S-scheme heterojunction for removing polycyclic aromatic hydrocarbons from natural seawater.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
ChemSusChem
·
2026
·Vol. 19
·期 12
·e70804
·
IF 5.9
Kening Xiang,Haoyu Wang,Yuhao Hong,Tao Liu,Cuizhu Li,Yared Daniel Reta,Yeshitla Tsegaw Gizaw,Dongfang Lu,Dong-Hau Kuo,Jinguo Lin,Xiaoyun Chen
Herein, a simple and environmentally benign synthetic strategy is developed to construct a hydrazine-regulated Bi/S co-doped CeVO 4 trimetallic sulfur-oxide photocatalyst (Bi/S-CeVO 4 ). The resulting material features abundant oxygen vacancy (Vo) defects and stabilized multivalent Ce 3+ /Ce 4+ and V 4+ /V 5+ states, which synergistically enhance photocatalytic hydrogen evolution reaction (PHER) performance under visible light irradiation. Band structure analyses indicate that Bi/S co-doping effectively modulates the electronic structure of CeVO 4 , leading to improved photocatalytic performance toward PHER. The coexistence of multivalent Ce 3+ /Ce 4+ and V 4+ /V 5+ species provides efficient electron-hopping pathways, facilitating photogenerated charge separation and transfer while prolonging carrier lifetime. In addition, Vo defects served as catalytic sites for water-molecule adsorption and activation, further accelerating surface reaction kinetics. Benefiting from these synergistic effects, the optimized Bi/S-CeVO 4 -3, featuring the highest electrochemically active surface area of 0.0015 cm 2 and Vo concentration of 24.5%, and suitable ratio of Ce 4+ /(Ce 3+ +Ce 4+ ) (41.8%) and V 4+ /(V 4+ +V 5+ ) (38.5%), delivers the highest PHER rate of 1514.7 μmol·h –1 , with an apparent quantum efficiency (AQE) x-ray diffraction of 15.28% at 420 nm. Moreover, the catalyst demonstrates excellent stability and durability. This work presents a feasible and effective strategy for electronic structure and defect engineering of CeVO 4 -based photocatalysts to achieve efficient solar-driven hydrogen evolution. Graphical Inspired by battery-material redox chemistry, hydrazine-regulated Bi/S co-doping constructs a defect-rich CeVO 4 sulfur-oxide with stabilized multivalent states, enabling a photocatalytic hydrogen evolution reaction rate of 1514.7 μmol·h –1 and an apparent quantum efficiency of 15.28% at 420 nm.
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DOI
PubMed
高影响因子
MATERIALS & DESIGN
·
2026
·
IF 8.2
Yang Yang,Jingjian Liu,Jiye Zhang,Shuya Zhang,Jiazhen Wu,Qizhang Wang,Guangyi Yang,Qinhua Chen
Refractory diabetic wound is characterized by excessive oxidative stress and inadequate angiogenesis, both of which are primarily caused by mitochondrial dysfunction. Although nanozymes exhibit multiple enzyme-mimicking antioxidant activities, challenges such as immune rejection, limited catalytic activity, and poor biocompatibility remain. Here in, a novel therapeutic system based on plant exosome nanovesicle-incorporated nanozymes was designed to mitigate oxidative stress and promote healing in diabetic wounds by targeting and restoring mitochondrial function. Titanium-doped cerium vanadate (CeVO 4 -Ti) nanozymes with multiple enzyme catalytic activities had been rationally designed. The surface of CeVO 4 -Ti was modified with triphenylphosphine (TPP) to endow mitochondrial targeting. To enhance biosafety and delivery, the nanozymes were further encapsulated within dendrobium officinale-derived nanovesicles (DOEVs) and integrated into a dopamine-methacrylated hyaluronic acid (DHM) hydrogel, forming a composite system (DOEVs@CTT/DHM). DOEVs@CTT/DHM could effectively mimic the activity of natural enzymes, eliminate reactive oxygen species, reconstruct blood vessels, and promote re-epithelialization, thereby facilitating wound healing from multiple perspectives. Crucially, it activated the Nrf2/Parkin/Pink1 pathway to regulate mitophagy, thereby revitalizing mitochondrial function and then alleviating oxidative stress. This study presents a novel strategy for mitochondrial regulation, advancing the development of multifunctional nanozyme-based biomaterials for wound healing.
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产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Pengkun Zhang,Yujie Lai,Xinghua Dai,Yunzhuo Xu,Xinru Wu,Baoqian Yang,Dong-Hau Kuo,Dongfang Lu,Qinhan Wu,Mengistu Tadesse Mosisa,Jinguo Lin,Xiaoyun Chen
Tetragonal wakefieldite (CeVO 4 )-like CeVOS catalysts with exceptional performance in catalytic reduction of Cr 6+ , MB, and RhB pollutants in the presence of NaBH 4 under dark was prepared via a green and facile method. Hydrazine reduces V 5+ ions to elevate the V 4+ contents, and sulfur-doped is employed to balance lattice deviations from electrical neutrality induced by high V 4+ concentrations, enhancing overall stability. Hydrazine modulation regulates the V 4+ /(V 4+ +V 5+ ) ratio, influencing sulfur doping, defect structure, and electron transfer efficiency. The CeVOS catalyst with an optimized V 4+ /(V 4+ +V 5+ ) ratio of 0.46 with abundant oxygen vacancies and exhibited exceptional catalytic performance. The 100 mL 50 ppm Cr 6+ , MB, and RhB solution were completely reduced in 10 min and durable stability, after six runs, it still achieved a 98.8% reduction of Cr 6+ within 10 min. Response surface methodology (RSM) elucidated variable interactions and their influence on catalytic reduction performance. The model’s robustness is underscored by a predicted R 2 of 0.9345. Optimal conditions for pollutant treatment in practical applications are 15 mg of catalyst, 25 mg of sacrificial agent, and a pH value of 6.8. Therefore, the green synthesis of efficient CeVOS catalysts bears excellent promise for industrial wastewater treatment .
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Beilei Li,Xiaoxiang Wang,Yaqing Wang,Weijia Wang,Shuguang Zhou,Shihan Zhang,Wei Li,Sujing Li
Elimination of NO x from the non-electric industrial boilers has become priority under the effective implementation of ultra-low emissions. A series of Ce-promoted FeVO 4 catalysts with improved acidity and reducibility have been synthesized in this work. Thereinto, 10Ce/FeVO 4 exhibited an optimum low-temperature performance with 90% of NO x conversion and 95% of N 2 selectivity at 200–300 °C which was kept nearly unchanged with different concentrations of SO 2 ranging from 50 ppm to 200 ppm, showing a superior sulfur tolerance. An array of well-designed experiments has demonstrated that Ce mainly existed as CeVO 4 under a low doping content (1 wt%) on FeVO 4 , which could efficiently increase the amount of acid sites. With more cerium (5–12 wt%) loading on FeVO 4 , the appearance of CeO 2 further resulted in a strong interaction between cerium species and ion species, thus significantly improving the low-temperature catalytic activity . Therefore, the optimum coexistence of CeVO 4 and CeO 2 over 10Ce/FeVO 4 modulated its Brønsted acid and enhanced its redox circulation of Fe 3+ species. Moreover, the NH 3 -SCR reaction pathways of 10Ce/FeVO 4 were broadened from only Eley-Rideal to both Eley-Rideal and Langmiur-Hinshelwood mechanisms after Ce loading on FeVO 4 catalyst. With the presence of SO 2 , the S O/S-O deriving from the generated Ce 2 (SO 4 ) 3 and NH 4 HSO 4 increased the Brønsted acid sites, inducing a satisfying SO 2 tolerance of 10Ce/FeVO 4 catalyst, although the Langmiur-Hinshelwood pathway of 10Ce/FeVO 4 was immediately cut off due to the competitive adsorption of gaseous SO 2 and NO x . This work exemplifies a promising strategy for developing an ideal low-temperature NH 3 -SCR catalyst with good SO 2 resistance.
研究领域:
催化
·
环境科学
·
化学工程
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DOI
高影响因子
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