JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2023
·
IF 9.9
Shiming Zhang,Songyu Fan,Ting Liang,Jingwen Wei,Tingting Zhu,Yuxiang Shen,Zebin Yu,Hongxiang Zhu,Shuangfei Wang,Yanping Hou
Photocatalytic conversion of carbon dioxide (CO 2 ) into high value-added chemicals is an attractive yet challenging process, primarily due to the readily recombination of hole-electron pairs in photocatalysts. Herein, dual-oxygen-vacancy mediated Z-scheme Bi 2 Sn 2 O 7 /Sn/NiAl-layered double hydroxide (V O,O -20BSL) heterojunctions were hydrothermally synthesized and subsequently modified with Sn monomers to enhance photocatalytic activity toward CO 2 reduction. The abundance of oxygen vacancies endowed the V O,O -20BSL with extended optical adsorption, enhanced charges separation, and superior CO 2 adsorption and activation. The interfacial charges transfer of the V O,O -20BSL was demonstrated to follow a Z-scheme mechanism via photochemical deposition of metal/metal oxide. Under visible light irradiation, the V O,O -20BSL exhibited the highest yields of carbon monoxide (CO) and methane (CH 4 ), with values of 72.03 and 0.85 umol·g −1 ·h −1 , respectively, which were 2.66 and 1.57 times higher than that of the V O -NiAl-layered double hydroxide (V O -1LDH). In situ diffuse reflectance infrared fourier transform spectroscopy (DRIFTS) revealed that carboxylic acid groups (COOH*) and aldehyde groups (CHO*) were the predominant intermediates during CO 2 reduction, and accordingly, possible CO 2 reduction pathways and mechanism were proposed. This study presents a feasible approach to incorporate dual vacancies into Z-scheme heterojunctions for CO 2 reduction.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Hui-xin Wang,Hui Ren,Liu Yin,Ya-ru Li,Xin-zhou Wu
Boron has a high calorific value and good application prospects in energetic materials. However, further applications of boron are hindered by its incomplete combustion. MoO 3 has good catalytic properties, and its layered structure can provide good ion flow channels and embedding positions. In this study, mechanical mixtures of B/MoO 3 and B/Mo were prepared. The promotion of B combustion by MoO 3 and Mo was confirmed via combustion heat and burning rate tests. The mechanism by which Mo/MoO 3 promote B combustion was studied by thermal analysis, high-temperature in situ X-ray diffraction, X-ray photoelectron spectroscopy, and Raman spectroscopy . The maximum heat release and burning rate of B/MoO 3 and B/Mo were 2.49 and 2.62 and 2.67 and 2.55 times, respectively, those of raw boron. A pre-ignition reaction occurred when boron first came into contact with the surface of MoO 3 . The oxygen vacancies on the MoO 3 surface served as reaction sites for boron. MoO 3 promoted the combustion of B by opening up oxygen channels and improving the oxygen transport capability. Mo also effectively promoted boron combustion. B/Mo and B/MoO 3 have promising future applications as high energy release materials.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
LANGMUIR
·
2025
·
IF 3.9
Dexi Yu,Yuhong Lin,Wenhui Zhou,Xiaoyi Wang,Zhenzhen Yu,Yidong Hou,Masakazu Anpo,Jimmy C. Yu,Jinshui Zhang,Xinchen Wang
Photocatalytic oxidation of benzene to phenol using molecular O2 is one of the most promising sustainable approaches for the green synthesis of phenol. Introducing oxygen vacancies (OVs) on semiconductor surfaces by defect engineering is a promising strategy to enhance the efficiency of benzene oxidation to produce phenol due to the unique functions of OVs in facilitating the charge separation and activation of molecular O2. Herein, a vacuum-sealed annealing strategy has been well developed to generate abundant surface OVs on semiconductors, such as WO3. The well-sealed quartz vial creates a well-controlled low-pressure condition for the formation of OVs without the need for external energy for maintaining the vacuum state. Moreover, the gaseous species generated during the thermal annealing process help mitigate stress-induced defects, particularly bulk defects. The vacuum-sealed annealed WO3 with sufficient OVs and reduced bulk defects shows a better photocatalytic performance in the one-step oxidation of benzene to phenol with O2, compared to the WO3 synthesized through thermal annealing in Ar and H2 atmospheres. The present vacuum-sealed annealing strategy is found to be further applicable to engineer a wide range of semiconducting photocatalysts with abundant OVs to optimize their properties for efficient photocatalysis and other OV-promoted systems.
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Yachao Wang,Lingfang Liu,Yaxiong Wei,Xinsheng Xu,Guofeng Zhao,Rui Zhong,Cong Fu
Photocatalytic H2O2 production stands as a promising sustainable technology for chemical synthesis. However, rapid charge recombination and limited oxygen adsorption by photocatalysts often limit its efficiency. Herein, we demonstrate that the synergy of Ag and interfacial oxygen vacancies on TiO2 could overcome these challenges. The optimized Ag/TiO2-50 photocatalyst achieved an impressive H2O2 production rate of 12.9 mmol h–1 g–1 and maintained a steady-state concentration of 12.8 mM, significantly outperforming most TiO2-based photocatalysts documented in the literature. Detailed mechanistic studies, aided by TAS, in situ X-ray photoelectron spectroscopy (XPS), and in situ electron paramagnetic resonance (EPR) techniques, indicate that the oxygen vacancies at the Ag–TiO2 interface act as an interfacial hole trap, inducing a directional hole transfer. This, coupled with Ag acting as an electron acceptor, synergistically boosts the electron–hole separation. Additionally, the increased amount of oxygen vacancies at the Ag–TiO2 interface of Ag/TiO2-50 leads to enhanced O2 adsorption, thus contributing to its superior catalytic performance. This study provides valuable insights into interfacial traps in the charge transfer process and highlights the potential of interface regulation for achieving efficient photocatalytic conversion.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
·
IF 20.2
Shan-Shan Liu,Huifen Fu,Fei Wang,Yuwei Wei,Bingxin Meng,Peng Wang,Chen Zhao,Wen Liu,Chong-Chen Wang
Oxygen vacancies (OVs) play crucial role in peroxymonosulfate (PMS) activation, however, the corresponding catalytic mechanism is ambiguous. Herein, we constructed abundant interfacial asymmetric oxygen vacancies (As-OVs) in OVs-ZnO/Co 3 O 4 that displayed remarkable different catalytic behavior from the symmetric oxygen vacancies (S-OVs) in OVs-CoO x . Specifically, the As-OVs achieved ultra-fast contaminants degradation (∼ 1 min) through both radical attack and electron-transfer process (ETP), while S-OVs exhibited sluggish kinetics for both pathways. Experimental and theoretical analyses revealed that PMS was easily adsorbed on the As-OVs to form PMS* , then ETP immediately occurred once OVs-ZnO/Co 3 O 4 encountered with electron-rich bisphenol A. When electron-poor benzoic acid replaced bisphenol A, the peroxide bond was quickly broken to produce radicals due to the largely polarized PMS* on the asymmetric sites. Conversely, the S-OVs cannot realize rapid removal of both targets because the symmetric sites weakened ETP. This work provides atomic-level insights to understand the catalytic behaviors of OVs.
研究领域:
环境科学
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催化
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Hongming Liu,Jingxin Wang,Hai Xiong,Yue Chen,Jianzhong Xiao,Chao Wang
Restricted by an insufficient understanding of the compositional and structural characteristics of the sensing materials that affect the sensing performances, the YSZ-based CO gas sensor remains in a dilemma in terms of further promoting sensitivity, selectivity and long-term stability. In this work, two bimetallic oxides with different crystal structures, perovskite SmMnO 3 and mullite SmMn 2 O 5 , were prepared and adopted to elucidate the roles of the Mn 3+ , Mn 4+ and surface oxygen vacancies . Compared with SmMnO 3 , the coexisting coordination modes of Mn 3+ and Mn 4+ in SmMn 2 O 5 is conducive to generating oxygen vacancies. Furthermore, a SmMn 2 O 5 -based sensor with more oxygen vacancies demonstrates a relatively faster response/recovery speed and enhanced sensitivity of 2.05 times that of SmMnO 3 under the same operation conditions. Such work may broaden insight into the development of efficient sensing materials that introduce oxygen vacancies through the construction of phase structures without complicated operations. Overall, the sensor attached to SmMn 2 O 5 exhibits a low detection limit (5 ppm), a feasible response/recovery speed (24 s/28 s toward 40 ppm CO operating at 450 °C), satisfactory CO selectivity and long-term stability, highlighting its potential for CO monitoring in harsh environments.
研究领域:
材料科学
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传感器技术
✓ 已验证
DOI
高影响因子
Desalination and Water Treatment
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2024
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IF 1
Wen An,Shaomang Wang,Yang Fu,Yuan Guan,Zhongyu Li,Tao Xu,Haoran Wang
Bi 2 WO 6 nanosheets with gradient oxygen vacancies were synthesized by acetic acid solvothermal and subsequent calcination. The photocatalytic activity of the calcined Bi 2 WO 6 was significantly enhanced. The calcination regulated the oxygen vacancy in Bi 2 WO 6 . Oxygen vacancy defects helped to adjust the band structure and change the surface chemical state. At the same time, the electrons were the main charge carriers of the n-type semiconductor Bi 2 WO 6 . Part of the electrons was captured by the oxygen vacancies to promote the separation of the holes. Some of the electrons reacted with oxygen to generate • O 2 – . The h + and • O 2 – were the main active species that degraded rhodamine B. Among them, Bi 2 WO 6 with 1 h of calcination at 315°C (Bi 2 WO 6 -315°C 1 h) exhibited the optimal photocatalytic activity. The degradation velocity of rhodamine B over Bi 2 WO 6 was 21.4 times that of Bi 2 WO 6 under the same reaction condition.
研究领域:
材料科学
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化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
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IF 6.3
Lina Qin,Guorong Zhang,Taigen Liang,Lixian Sun,Fen Xu,Yongpeng Xia,Sergey P. Verevkin,Sergey V. Vostrikov,Anton Lvovich Maximovi,Xuezhang Xiao,Lixin Chen,Hongge Pan
As a prominent catalyst in the development of MgH 2 hydrogen storage materials, MXene can significantly enhance hydrogen storage performance. In this study, we investigated the impact of using molten salts instead of HF to treat Ti 2 NTi x and its impact on the hydrogen storage properties of MgH 2 . MgH 2 -10 wt% Ti 2 NTi x composite has been prepared via ball milling. The results showed that adding 10 wt% Ti 2 NTi x largely lowered the initial dehydrogenation temperature of MgH 2 from 300.2 ℃ to 173.5 ℃. Under isothermal conditions at 350 ℃, the composite released 6.11 wt% H 2 within 4 minutes. Furthermore, after dehydrogenation, the MgH 2 -10 wt% Ti 2 NTi x composite absorbed 3.4 wt% H 2 in 60 minutes at 100 ℃ and 30 bar hydrogen pressure. EPR found that there is a large number of oxygen vacancies on the Ti 2 NTi x surface introduced by molten salt treatment, providing abundant active sites and accelerating electron transfer. Additionally, the in-situ formation of titanium nitride compounds, the synergistic multivalent catalytic effect of titanium, and the multiphase interfaces in MgH 2 -10 wt% Ti 2 NTi x contributed to the composite’s improved catalytic activity and stability. This work provided valuable insights into the application of oxygen vacancy-rich, incompletely etched Ti 2 NTi x materials in magnesium-based hydrogen storage, demonstrating their great potential in hydrogen storage technologies.
研究领域:
材料科学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2018
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IF 4.439
Zhongwei Zou,Haiming Xu,Dongya Li,Jingyu Sun,Dongsheng Xia
The 2D BiOCl nanosheets with excellent photocatalytic activity were synthesized via the facile hydrothermal method by regulating the pH value of the precursor solution and using dulcitol (C 6 H 14 O 6 ) as the surfactant. The photocatalysts were characterized by XRD, FT-IR, SEM, TEM, BET, XPS, ESR, O 2 -TPD, EIS, DRS and PL. The results of morphological and structural characterization indicate that the pH has a large effect on the thickness of the nanosheets and the exposure ratio of {0 0 1} facets. The photocatalytic property of the sample prepared at pH 4 showed excellent visible-light photocatalytic performance to degrade RhB owing to the small thickness, the exposed {0 0 1} facets and the optimum concentration of oxygen vacancy. Moreover, the reasonable photocatalytic mechanism was revealed by the active species trapping experiments and ESR characterization, which suggested O 2 − and h + are the main active species in the present system.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
·
IF 19.503
Yingtong Zou,Yezi Hu,Andrej Uhrich,Zewen Shen,Baoxiang Peng,Zhuoyu Ji,Martin Muhler,Guixia Zhao,Xiangke Wang,Xiaoxiang Xu
We provide a distinct understanding on the role of oxygen vacancies (OVs) for visible light-triggered aerobic oxidation of alcohols via comparative studies on three kinds of Nb 2 O 5 , i.e., undoped, Ti-doped and Ce-doped Nb 2 O 5 . With benzyl alcohol and 5-hydroxymethylfurfural as representative alcohol substrates, we show that fast alcohol oxidation with high selectivity can be achieved on these doped Nb 2 O 5 containing abundant OVs. However, the functionality of OVs is dependent on the properties of dopants as Ce-doped Nb 2 O 5 exhibits a better performance than Ti-doped one. Investigations indicate that the Ce dopants incur little distortion to the structure of Nb 2 O 5 and induce more accessible OVs than Ti dopants for the dissociative chemisorption of alcohol molecules which supports favorable interfacial electron migration process. The present work not only reveals the difference of oxygen vacancies caused by varied metal doping but provides a unique insight in the relation between OVs structure and photocatalytic alcohol oxidation.
研究领域:
催化化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Biosensors-Basel
·
2022
·Vol. 12
·期 8
·592
·
IF 5.743
Tong Li,Qi Wang,Zhou Wang
Facet and defect engineering have achieved great success in improving the catalytic performance of CeO2, but the inconsistent reports on the synergistic effect of facet and oxygen vacancy and the lack of investigation on the heavily doped oxygen vacancy keeps it an attractive subject. Inspired by this, CeO2nanocrystals with selectively exposed crystalline facets (octahedron, cube, sphere, rod) and abundant oxygen vacancies have been synthesized to investigate the synergistic effect of facet and heavily doped oxygen vacancy. The contrasting electrochemical behavior displayed by diverse reduced CeO2nanocrystals verifies that oxygen vacancy acts distinctly on different facets. The thermodynamically most stable CeO2octahedron enclosed by heavily doped (111) facets surprisingly exhibited the optimum non-enzymatic H2O2sensing performance, with a high sensitivity (128.83 µA mM−1cm−2), a broad linear range (20 µM~13.61 mM), and a low detection limit (1.63 µM). Meanwhile, the sensor presented satisfying selectivity, repeatability, stability, as well as its feasibility in medical disinfectants. Furthermore, the synergistic effect of facet and oxygen vacancy was clarified by the inclined distribution states of oxygen vacancy and the electronic transmission property. This work enlightens prospective research on the synergistic effect of alternative crystal surface engineering strategies.Keywords:electrochemical H2O2sensing;oxygen vacancy;facet;cerium dioxide
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CATALYSIS
·
2023
·
IF 7.3
Guangmin Ren,Zehui Zhao,Zizhen Li,Zisheng Zhang,Xiangchao Meng
Herein, we applied a rapid Joule heating method to form oxygen vacancies and further induced the deposition of Ru clusters onto BiVO 4 . The rapid Joule heating method fabricated oxygen vacancy on BiVO 4 , resulting in the formation of electron-rich active Ru sites and unsaturated V sites. The pristine BiVO 4 was almost no activity in photocatalytic ammonia synthesis. The photocatalytic production rate of ammonia was increased to 3.88 μmol g - 1 h -1 after the formation of oxygen vacancies, and further increased to 16.57 μmol g -1 h -1 with Ru clusters loaded on BiVO 4 . It was indicated that unsaturated V sites near the oxygen vacancy and Ru clusters might act as the reactive sites for N 2 adsorption and activation. And the strong metal-support interactions between Ru and BiVO 4 resulted in charge redistribution between Ru clusters and BiVO 4 supports, thus reducing energy barrier of the rate-determining step for the N 2 hydrogenation. Furthermore, DFT confirmed that associative alternating pathway was suitable for this process.
研究领域:
材料科学
·
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）