Nanomaterials
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2023
·Vol. 13
·期 18
·2545
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IF 5.3
Lin Li,Qi Li,Dongqing Wang,Yubo Zhang,Fei Li,Yaru Zhang,Tifeng Jiao
The catalytic treatment of wastewater serves as an effective way to solve the problem of water pollution, in which non-homogeneous Fenton catalysts are widely used. However, the activity enhancement of non-homogeneous Fenton catalysts still remains a great challenge. Herein, self-assembled BiFeO3/CeO2nanocatalytic materials with different molar ratios were successfully fabricated by a suspension blending method, following which the structure evolution was determined by various characterizations. The catalytic degradation of methylene blue (MB), rhodamine B (RhB), and saffron T (ST) were performed over the BiFeO3/CeO2nanocatalytic materials. It was found that the 0.2BiFeO3:0.8CeO2nanocatalytic materials exhibited an 80.8% degradation efficiency for RhB. The 0.6BiFeO3:0.4CeO2nanocatalytic materials reached 81.1% and 48.7% for ST and MB, respectively. The BiFeO3/CeO2nanocatalytic materials also showed a good stability during several cycles. The combination of CeO2with BiFeO3led to an enhanced activity for dye degradation, probably due to the electron transfer from ≡Fe2+to ≡Ce4+. This study provides a new approach to dye degradation by using Fenton catalytic systems.Keywords:CeO2;BiFeO3;nanocatalytic materials;non-homogeneous Fenton catalysts;dye degradation
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
PubMed
高影响因子
Inorganic Chemistry Frontiers
·
2023
·Vol. 10
·期 10
·3091-3102
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IF 7
Jianping Liu,Guijun Li,Chuanlan Xu,Hongdian Chen,Rong Jin,Lingtao Sun,Chenyang Shu,Haifeng Chen,Chaozhong Guo,Honglin Li,Yujun Si
Non-precious metal Fe–N–C materials are considered one of the promising substitutes for the Pt/C catalyst toward the oxygen reduction reaction (ORR). However, they still suffer from rapid stability reduction caused by the severe Fenton reaction in the ORR process. Here we report a supramolecular-gel-pyrolysis (SGP) method to design a non-noble CeO2/Ce-N–C composite with a hierarchically porous carbon sheet-network structure, serving as an efficient Ce single-atom-site (Ce-N4O4) catalyst for the ORR in a zinc–air battery (ZAB). The prepared catalyst displays comparable ORR catalytic activity and stability to those of Pt/C in an alkaline electrolyte. The corresponding ZAB tests also show a higher energy density and better long-term cycling durability. Theoretical calculations indicate that the enhanced ORR activity may be attributed to the fact that the presence of oxygen vacancies and the Ce-N4O4|CeO2 coupling sites can largely favor the chemical adsorption and activation of O2. This work provides a new avenue for exploring rare-earth metal single-atom ORR electrocatalysts with coupled ORR catalytic sites.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
MATERIALS LETTERS
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2014
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IF 2.269
Jing Li,Yan Chen,Yongcai Zhang,Yanyan Zhao,Qian Zhang,Zhanjun Yang
This work reports an alternative preparation and evaluation of nanocrystalline N-modified CeO 2 as a visible-light-active photocatalyst . Nanocrystalline N-modified CeO 2 (which was abbreviated as CeO 2 –HNO 3 ) was synthesized directly via the solvothermal reactions of Ce(NO 3 ) 3 ·6H 2 O, concentrated (65–68 mass%) HNO 3 and toluene at 180 °C for 24 h. The composition, structure and optical property of CeO 2 –HNO 3 were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, transmission electron microscopy and UV–vis diffuse reflectance spectroscopy. The photocatalytic activity of CeO 2 –HNO 3 was tested in the reduction of aqueous Cr 6+ under visible-light ( λ >420 nm) irradiation, and compared with that of CeO 2 –NH 3 (which denoted the product prepared when 25-28 mass% NH 3 ·H 2 O replaced 65–68 mass% HNO 3 ). It was observed that CeO 2 –HNO 3 exhibited much higher photocatalytic activity than CeO 2 –NH 3 in the reduction of aqueous Cr 6+ under visible-light ( λ >420 nm) irradiation. CeO 2 –HNO 3 may be a new promising visible-light-active photocatalyst in efficient utilization of solar energy for treating Cr 6+ wastewater.
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
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2025
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IF 7.3
Shiyu Wu,Xincheng Cao,Peng Liu,Jiaping Zhao,Jianchun Jiang,Junming Xu
The selective hydrogenation of natural oils to produce fatty alcohols is a key process for synthesizing liquid alkanes and high-value chemicals. However, the development of catalysts capable of enhancing hydrodeoxygenation (HDO) selectivity while suppressing carbon–carbon (C–C) bond cleavage to minimize carbon loss remains a significant challenge. In this study, a FeReOx/CeO2 catalyst was developed, which was characterized by high selectivity to octadecanol (93.8%, 210 °C) and liquid alkanes from stearic acid under mild conditions. Notably, the FeReOx/CeO2 catalyst exhibited a higher hydrodeoxygenation selectivity in the production of liquid alkanes than decarboxylation (DCO) (C18: 84.2% vs C17: 15.8% at 240 °C). Detailed characterization of the FeReOx/CeO2 catalyst revealed that excellent catalytic activity originated from the synergistic interaction between Fe and ReOx. The introduction of ReOx not only enhanced the adsorption of stearic acid but also improved the dispersion of metallic Fe. The weak acidity of metallic Fe could inhibit the cleavage of the C–C bond to a certain extent to obtain alkane products with high hydrodeoxygenation selectivity. Furthermore, the catalyst exhibited strong stability without significant deactivation after five cycles.
研究领域:
催化化学
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能源化学
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产品关联
DOI
高影响因子
ACS Catalysis
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2019
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IF 12.221
Yanfu Ma,Banlan Chi,Wei Liu,Lina Cao,Yue Lin,Xiaohui Zhang,Xuxu Ye,Shiqiang Wei,Junling Lu
Atomically dispersed metal atoms on supports, so-called single-atom catalysts (SACs), have recently attracted extensive attention in the catalysis field. It has been found that besides the primary metal atom, the proximial atoms also contribute to the catalytic activity significantly. Here, we show that tailoring of the local coordination environment of Pt1 single atoms on CeO2 using phosphorus gives rise to an activity enhancement up to a 10 times higher than Pt1/CeO2 SAC in hydrogenation of styrene, cyclohexene, phenylacetylene, and nitrobenzene. X-ray absorption, photoelectron, and infrared spectroscopies showed that the Pt1 single atoms modulated by phosphorus have a higher valence state. Infrared spectroscopy and temperature-programmed reduction further unveiled that significantly stronger adsorption of reactant and facilitated hydrogen spillover on phosphorus-doped CeO2 both play important roles for the dramatic activity enhancement. These findings point out an avenue to design an advanced SACs with high activity.
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
ChemSusChem
·
2021
·Vol. 15
·期 13
·e202101983
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IF 8.928
Yanan Wei,Yunlei Zhang,Yao Chen,Fang Wang,Yu Cao,Wen Guan,Xin Li
Graphical Saving face : Catalytic performance of Au/CeO 2 with different exposed CeO 2 crystal faces for oxidation of 5-hydroxymethlfurural to 2,5-furandicarboxylic acid is dependent on the oxygen vacancy (V O ) concentration. Higher V O concentration of Au/rod-CeO 2 (110) is more beneficial for adsorption of oxygen and formation of active oxygen species than Au/cube-CeO 2 (100) and Au/oct-CeO 2 (111). Developing an efficient catalyst to upgrade 5-hydroxymethylfurfural (HMF) to high-value-added downstream chemicals is of great significance in biomass conversion. Nanorod (110)-, nanocube (100)-, and nanooctaheron (111)-CeO 2 -supported Au nanoparticles were prepared to investigate the intrinsic effect of CeO 2 crystal faces on the oxidation of HMF to 2,5-furandicarboxylic acid (FDCA). The experimental results and density functional theory calculation revealed that the concentration of oxygen vacancy (V O ) for exposed specific crystal faces was crucial to the oxygen adsorption ability, and Au/nanorod-CeO 2 with the highest V O concentration promoted the formation of more oxygen active species (superoxide radical) on CeO 2 (110) crystal face than (100) and (111) crystal faces. Besides, the higher V O concentration could provide a strong adsorption ability of HMF, greatly boosting the activation of HMF. Thus, these results led to a superior catalytic activity for HMF oxidation over Au/nanorod-CeO 2 (FDCA yield of 96.5 %). In-situ Fourier-transform (FT)IR spectroscopy uncovered the HMF oxidation pathway, and the possible catalytic mechanism was proposed. The deep insight into the role of regulation for crystal faces provides a basis for the rational design of highly active facets for the oxidation of HMF and related reactions.
研究领域:
催化化学
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材料科学
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生物质转化
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Baowei Cao,Dachuan He,Fei Rao,Qadeer Ul Hassan,Xiaolong Cai,Lingna Liu,Fan Xue,Gangqiang Zhu
BiOI-loaded flower-like CeO 2 (BiOI/CeO 2 ) p-n heterojunction was synthesized via a simple two-step chemical route. The phase structure and chemical states of the heterojunction were analyzed by X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS), respectively. The transmission electron microscopic (TEM) and the scanning electron microscope (SEM) reveal the close contact between BiOI and CeO 2 . The formation of the p-n heterojunction is verified by the Mott-Schottky curves. The p-type BiOI with a narrow band-gap when loaded on CeO 2 can not only improve the separation of photogenerated electron-hole pairs but also facilitate the absorption of visible light. The photo-oxidative removal efficiency of 9%BiOI/CeO 2 among other heterojunctions for NO reaches 45.49% and remains highly stable with an efficiency of 40.40% after the five cycles. Trapping experiments and ESR measurements were conducted to explore the contribution of charge carriers and the reactive oxygen species during the photocatalytic NO removal. This work highlights that constructing such p-n heterojunction by loading BiOI on CeO 2 microstructures can significantly enhance photocatalytic NO removal.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2022
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IF 4.326
Daoyun Zhu,Haiou Liu,Yangqiang Huang,Xiao Luo,Yu Mao,Zhiwu Liang
Rare earth metal oxides are known to have good catalytic effectiveness in the direct synthesis of dimethyl carbonate (DMC) from CO2 and methanol. In this work, we screened ceria (CeO2) catalysts by analyzing their capacity for CO2 adsorption. The effects of the crystal surface morphology and oxygen vacancy on the catalytic performance of the ceria catalyst were studied by using density functional theory (DFT). The results show that the (110) surface and higher oxygen vacancy content can better promote the synthesis of DMC and that the rod-shaped CeO2 catalyst has a better catalytic effect. The oxygen vacancy content on the catalyst was improved by freeze-drying and confirmed by thermogravimetric analysis, Raman spectroscopy, and electron paramagnetic resonance. The freeze-dried CeO2 (CeO2-FD) then showed a higher catalytic performance. The conversion rate of methanol and the yield of DMC were 33.95% and 584 mmol g–1cat, respectively, under mild conditions (140 °C and 1 MPa).
研究领域:
催化化学
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理论计算
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材料科学
✓ 已验证
DOI
高影响因子
NPG Asia Materials
·
2015
·Vol. 7
·期 5
·e179
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IF 10.118
Song Shuyan,Wang Xiao,Zhang Hongjie
Encapsulation of small noble metal nanoparticles has received attention owing to the resulting highly increased stability and high catalytic activity and selectivity. Among the types of inert metal oxides, CeO 2 is unique. It is inexpensive and highly stable, and, more importantly, the unique electronic configuration gives it a strong capability to provide active oxygen. The method of fabricating CeO 2 -encapsulated noble metal nanocatalysts is determined by the requirements of the application. In this review, we first describe the various types of encapsulated noble metals and then the current developments of synthesis in detail, including the types of hybrid nanostructures and successful synthetic strategies. The following section, concerning catalytic applications, is divided into three topics: anti-sintering capabilities, catalytic activities and selectivities. We hope that this review of the recent achievements and the proposed strategy for addressing the emerging challenges will inspire further developments in this research area.
研究领域:
材料科学
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催化化学
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
·
IF 9.965
Zhipeng Mao,Wei Hao,Wei Wang,Fubin Ma,Chengcheng Ma,Shougang Chen
As an influential antifouling material, photocatalytic materials have drawn attention increasingly over recent years owing to their potential bacteriostatic property in the domain of marine antifouling. Herein, a flower-like BiOI@CeO 2 @Ti 3 C 2 S-scheme photocatalyst was contrived and prepared by hydrothermal method . The innovative combination of Ti 3 C 2 and narrow band gap semiconductor BiOI was implemented to modify CeO 2 and the photocatalytic bacteriostatic mechanism of BiOI@CeO 2 @Ti 3 C 2 was elucidated. Schottky junction was formed between CeO 2 and Ti 3 C 2 , and a p-n junction was formed between CeO 2 and BiOI. By photoelectrochemical characterization, BCT-10 exhibits the best photoelectrochemical performance of which photogenerated carrier transport can be performed more readily at 10 % CeO 2 @Ti 3 C 2 addition. 99.76 % and 99.89 % of photocatalytic bacteriostatic efficiency of BCT-10 against Escherichia coli and Staphylococcus aureus were implemented respectively, which were 2.98 and 3.07 times higher than that of pure CeO 2 . The ternary heterojunction can suppress photogenerated electron-hole complexes more effectively and enhance the photocatalytic bacteriostatic effect of CeO 2 , which also provided a new concept to the further broadened application of CeO 2 in the marine bacteriostatic and antifouling field.
研究领域:
材料科学
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环境科学
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微生物学
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产品关联
DOI
PubMed
高影响因子
FUEL
·
2023
·
IF 7.4
Lin-Cong He,Hua-Hui Xu,Xing-Yue Leng,Ling-Yun Jin,Ai-Ping Jia,Meng-Fei Luo,Jian Chen
Selective catalytic oxidation of nitrogen containing volatile organic compounds (NVOCs) is very meaningful but still remains big challenge because it is very difficult to balance the oxidation activity and N 2 selectivity of available catalysts. In order to develop excellent catalysts with high N 2 selectivity in wide temperature window ( △T ) during NVOCs oxidation, CeO 2 modified CuO/ZSM-5 catalysts with different CeO 2 addition order were prepared for diethylamine (DEA) oxidation. Detailed characterizations of catalysts such as XRD, XPS, H 2 -TPR and NH 3 -TPD were conducted, it is found that addition of CeO 2 obviously changes the geometrical and electronic states of CuO active sites in the catalyst, and CeO 2 addition order affects the Ce 3+ ratio on the catalyst surface. Promotion of CeO 2 species enables the generation of more highly active Cu species (Cu + species and finely dispersed CuO clusters) for DEA oxidation; and synergistic catalysis of the Ce 3+ species, active Cu species and acid sites in ZSM-5 leads to the high N 2 selectivity in wide temperature window ( △T ). Compared to the CeO 2 /CuO/ZSM-5 and CuO-CeO 2 /ZSM-5 catalysts, the CuO/CeO 2 /ZSM-5 catalyst exhibits moderate high oxidation activity with T 99 of 230 °C and the widest △T of 150 °C for high N 2 selectivity. Our primary results in this work provide the efficient strategy for improving catalyst employed for NVOCs selective oxidation.
研究领域:
催化化学
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环境科学
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产品关联
DOI
高影响因子
ACS Applied Energy Materials
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2023
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IF 6.4
Yiwang Dong,M. A. K. Yousaf Shah,Muhammad Khalid,Yuzheng Lu,Changhong Deng
Enhancing ionic conductivity and catalytic activity for slow oxygen reduction at lower operating temperatures could revolutionize the widespread adoption of low-temperature ceramic fuel cells (LT-CFCs; 400–550 °C). In this study, we introduce a semiconductor heterostructure composite consisting of a spinelike structure of CuFe2O4 (CFO) and CeO2, which is an efficient electrolyte membrane for solid oxide fuel cells. To improve fuel cell performance at suboptimal temperatures, we developed the CFO-CeO2 heterostructure composite. Our results demonstrate that a button-sized SOFC fueled by H2 and ambient air can deliver 750 mW/cm2 of power at 550 °C, potentially operating down to 400 °C. Furthermore, the CFO-CeO2 heterostructure composite exhibits higher oxygen vacancy and lower activation energy than individual CFO and CeO2 components, facilitating ion transit. Enhanced ionic conduction of the CFO-CeO2 heterostructure composite was thoroughly investigated using various transmission and spectroscopic techniques, including X-ray diffraction (XRD), photoelectron spectroscopy (PS), ultraviolet–visible (UV–vis), and impedance spectroscopy (IS). These findings underscore the effectiveness of the heterostructure approach for LT-SOFCs.
研究领域:
材料科学
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能源技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）