TALANTA
·
2024
·
IF 5.6
Lulu Cui,Houshen Li,Weijie Shi,Yingying Jing,Shuhong Sun,Shiyun Ai,Zeyi Guo
Reducing the size of active species is a powerful means to improve the utilization rate of active metals and enhance the properties of bimetallic nanozymes. In this work, Fe was introduced into Ce-MOF through the coordination of Fe 3+ and organic ligands, and the coordination effect resulted in atomically dispersed Fe in the derived Fe/CeO 2 nanozyme. Due to the atomically dispersed Fe embedded in the lattice of CeO 2 , a large number of defect sites were generated, endowing the nanozyme with excellent peroxidase (POD)-like activity. The constructed total antioxidant capacity (TAC) sensor based on the POD-like activity of Fe 1.01 /CeO 2 nanozyme displayed a very wide linear concentration range for AA, Cys, Glu and Trolox. More importantly, this TAC sensor can be applied to the TAC detection in vitamin C tablets and beverages. This work provides theoretical guidance for the synthesis of high-performance bimetallic nanozymes for TAC detection.
研究领域:
材料科学
·
生物医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Carbon Energy
·
2024
·
IF 19.5
Fangfang Chang,Zhenmao Zhang,Yan Zhang,Yongpeng Liu,Lin Yang,Xiaolei Wang,Zhengyu Bai,Qing Zhang
Electrochemical CO 2 reduction reaction (CO 2 RR) offers a promising strategy for CO 2 conversion into value-added C 2+ products and facilitates the storage of renewable resources under comparatively mild conditions, but still remains a challenge. Herein, we propose the strategy of surface reconstruction and interface integration engineering to construct tuneable Cu 0 –Cu + –Cu 2+ sites and oxygen vacancy oxide derived from CeO 2 /CuO nanosheets (OD-CeO 2 /CuO NSs) heterojunction catalysts and promote the activity and selectivity of CO 2 RR. The optimized OD-CeO 2 /CuO electrocatalyst shows the maximum Faradic efficiencies for C 2+ products in the H-type cell, which reaches 69.8% at −1.25 V versus a reversible hydrogen electrode (RHE). Advanced characterization analysis and density functional theory (DFT) calculations further confirm the fact that the existence of oxygen vacancies and Cu 0 –Cu + –Cu 2+ sites modified with CeO 2 is conducive to CO 2 adsorption and activation, enhances the hydrogenation of *CO to *CHO, and further promotes the dimerization of *CHO, thus promoting the selectivity of C 2+ generation. This facile interface integration and surface reconstruction strategy provides an ideal strategy to guide the design of CO 2 RR electrocatalysts.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2024
·
IF 5.2
Shihai Cao,Haocheng Yang,Cheng Cheng,Jinheng Dai,Shuaishuai Lu,Yao Lu
Photocatalytic technology has been proven to be a simple and effective method for degrading recalcitrant organic pollutants. In this study, a series of Z-scheme heterojunction nanocomposites composed of CeO 2 and terephthalic acid-modified WO 3 was prepared and further used as photocatalysts for perfluorobutane sulfonate (PFBS) degradation. In this design, terephthalic acid was used as an electron recombination center and heterojunction mediator, which effectively enhances the migration ability of electron–hole pairs and the physicochemical stability of the catalyst. In addition, in situ synthesis of CeO 2 onto the WO 3 surface by the coordinate bond between terephthalic acid and Ce ions can avoid CeO 2 agglomeration. As a result, the CeO 2 @WO 3 photocatalyst exhibits excellent PFBS degradation ability (94% for CeO 2 @WO 3 vs. 19% for CeO 2 ). After the fifth cyclic degradation experiment, the CeO 2 @WO 3 photocatalyst still maintains stable degradation efficiency. Furthermore, the reaction mechanism of the PFBS in CeO 2 @WO 3 photocatalytic process was analyzed by free radical trapping experiment and liquid chromatography tandem mass spectrometry (LC-MS) technique. This study provides new insights for constructing Z-scheme heterojunction and demonstrates that CeO 2 @WO 3 photocatalysts possess a promising prospect for degrading PFBS pollutants.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Manyi Chen,Jianquan Luo,Yinhua Wan,Xiangrong Chen,Xinquan Liang
Constructing an interlayer in the thin-film nanocomposite (TFN) membranes has been proved to be an effective strategy to break the trade-off between permeability and selectivity. The interlayer plays an important role in the formation of polyamide (PA) layer. In this study, cerium oxide (CeO 2 ) nanoparticles with three shapes, including sphere, rod and flake were used to fabricate the interlayers of TFN membranes. The effects of nanoparticle shape and loading on the morphologies and properties of the interlayers and resultant TFN membranes were systematically investigated. The results showed the morphologies and physicochemical properties of the PA layers could be regulated well by the shape and loading of CeO 2 nanoparticles. The surface morphologies of the TFN membranes exhibited the transformation from nodule structure to ridge-valley structure. At the same time, the introduction of interlayer made PA layer coarser, the pore size smaller and the pore distribution more uniform. Under the same loading conditions, the rodlike CeO 2 nanoparticles tended to form a homogeneous network-like interlayer due to the large specific surface area and good dispersion. The interlayer reduced the transport path of water molecules in the PA layer based on the “gutter” effect, thus improving the permeability of TFN membrane. The water permeability of the TFN membrane with rodlike CeO 2 interlayer could be 124% higher than that of the control, while the rejection of salts did not significantly change. This study deepens our understanding on the role of nanoparticle in regulating the morphologies and properties of interlayer and TFN membrane, and provides an effective method to enhance separation performance of nanofiltration membrane.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Yongji Xia,Tianle Mao,Xuefeng Jin,Le Wang,Jian Yan,Sheng Lin,Dong-Liang Peng,Zhaoju Yu,Guanghui Yue
The development of efficient catalysts to accelerate the three-phase reaction at the cathode side represents a crucial step in enhancing the performance of lithium-oxygen batteries (LOBs) with high energy density. In this study, NiFe 2 O 4 /CeO 2 composites with an appropriate Ce concentration were prepared as cathode catalysts for LOBs, and the unique micro-flower structure maximally exposed the active sites of the materials. The catalyst cleverly integrates the excellent oxygen evolution reaction (OER) activity of NiFe 2 O 4 and the outstanding oxygen reduction reaction (ORR) activity of CeO 2 . The high concentration of oxygen vacancies and the composite structure synergistically enhanced the charge transfer ability, altered the charge distribution of the active sites, and modulated the electronic structure of the material, thereby achieving an appropriate adsorption energy for oxygen-containing intermediates. Consequently, the composite material displays 343 stable cycles, a round-trip efficiency of 97.8 %, and a discharge specific capacity of 7478 mAh/g. Additionally, it exhibits fast charging and slow discharging capabilities for up to 726 h. This work offers insights into the design of efficient bifunctional cathode catalysts for LOBs.
研究领域:
材料科学
·
电化学
·
能源存储与转换
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2024
·
IF 0
Wang Fei,Jin Yulong,Xue Yun,Yu Shuihang,Liu Na,Ma Qingxiang,Xu Jie,Xue Bing,Wei Xuejiao
It is desirable but challenging to develop highly-efficient catalysts for the direct synthesis of dimethyl carbonate (DMC) from methanol and CO 2 . The vacancy-mediated incorporation of heteroatom into surface reconstruction is an efficient method of defect engineering for enhancing the catalytic properties. In this work, manganese-doped cerium oxide porous nanoribbons (Mn/CeO 2 -BTC) were prepared derived from a Ce-BTC by a sacrificial template approach. It is found that the catalytic activity of Mn/CeO 2 -BTC catalysts can be readily controlled by varying the amount of Mn dopants and the as-synthesized 0.1-Mn/CeO 2 -BTC exhibited an outstanding activity for the synthesis of DMC from CO 2 and methanol, which reached a high DMC yield (6.53 mmol DMC /g cat. ) without any dehydrating agents. Based on characterization results, the enhanced performance may be attributed to the defective structures caused by Mn doping and the porous nanoribbons of the CeO 2 crystals, which provide more surface oxygen vacancies and acidic-basic sites, favoring adsorption and activation of CO 2 and methanol.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2018
·
IF 4.229
Laifei Xiong,Jinglei Bi,Liqun Wang,Shengchun Yang
Developing cheaper but efficient electrocatalysts toward hydrogen evolution reaction (HER) are highly desirable for the sustainable energy conversion techniques. The nanostructured CoP has been proved to be one of the most efficient non-noble metal HER catalyst. However, to further improve their performance in hydrogen evolution reaction (HER) is still a challenging task. In the present work, we prepare the nanohybrid CeO 2 -CoP-C catalyst with high porosity through a co-ionic-exchange with Co and Ce ions using the metal-organic frameworks (MOFs) as template followed with a low-temperature phosphorization route. The high porosity of the catalysts is conductive to the diffusion and mass transfer of the reactants on the catalyst surface . Meanwhile, the doping of rare earth (RE) element modulates the electronic structure of the CoP nanoparticles , and the carbon skeleton left over from the annealed MOF is beneficial to the electronic conduction in the catalyst. Electrochemical tests showed that the ternary CeO 2 -CoP-C/CC hybrid nanostructure presented overpotential of 71 mV at 10 mV cm −2 (η 10 ), which is much higher than that of the binary CoP-C/CC catalysts (i.e., 132 mV). In addition, the ternary catalyst also presented a superior long-term durability in an acidic electrolyte. This work opens up a potential strategy for designing more efficient CoP-based catalysts toward electrochemical water splitting.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 67
·38641-38647
·
IF 2.936
Tianyu Guo,Xiaorong Nie,Jianping Du,Jinping Li
A series of Pd/CeO2-nanorods catalysts modified with alkaline-earth metals were prepared by the incipient impregnation method. Their catalytic properties in low-concentration methane oxidation were also investigated. The catalysts were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy and H2-temperature-programmed reduction techniques. The catalytic results show that the Ca element doped in Pd/CeO2, with optimum molar ratio of Pd to Ca of 2 and calcination temperature of 450 °C, improved the properties of the Pd-based catalyst remarkably, which is attributed to strong Pd–support interaction and high oxygen mobility. Therefore, calcium is more suitable as a promoter for enhancing the activities of the Pd/CeO2 catalyst in methane oxidation.
研究领域:
化学工程
·
催化材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Hao Tang,Zi Ang Chen,Muchen Wu,Shunbo Li,Ziran Ye,Mingjia Zhi
Tuning the size of Au nanoparticles is always an interesting task when constructing Au/semiconductor heterojunctions for surface plasmon resonance-enhanced photocatalysis. In particular, the size of Au nanoparticles in the newly emerging “plasmonic aerogel” photocatalyst concept could approach the size of the semiconductor phase. This work provides an alternative route to realize the size tuning of Au nanoparticles in Au-CeO 2 composite aerogels to some extent, within the framework of the well-established epoxide addition sol–gel method. The size tuning is achieved by exploiting the multi-functionalities of a mixed organic acid additive containing a thiol group in the gelation step. The obtained aerogel photocatalysts are composed of a porous backbone of interconnected CeO 2 nanoparticles and Au nanoparticles, and the size of Au nanoparticles ranges from ∼30 nm to sub-10 nm, while the size of CeO 2 remains at ∼15–10 nm. The surface plasmon resonance peak position and intensity contributed by the Au nanoparticles then vary accordingly. Photocatalytic CO 2 reduction at the gas–solid interface is chosen as a model reaction to study the effect of Au nanoparticle size on the photocatalytic activity of composite aerogel photocatalysts. The addition of Au nanoparticles undoubtedly enhances the overall activity of the CeO 2 aerogel photocatalyst, while the degree of enhancement (in terms of total charge consumption) and product selectivity (CH 4 or CO) are different and correlated with the size of the Au nanoparticles. The best performance can be achieved in a composite in which the Au sizes are the smallest.
研究领域:
材料科学
·
化学工程
·
环境科学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Catalysis Science & Technology
·
2021
·Vol. 11
·期 13
·4581-4595
·
IF 6.119
Xuelong Lv,Songcai Cai,Jin Chen,Dongxu Yan,Mingzhu Jiang,Jing Chen,Hongpeng Jia
Enhancing the surface acidity has been seen as an effective strategy to optimize the performance of catalysts for the degradation of chlorinated volatile organic compounds (CVOCs). Herein, a series of catalysts are constructed by introducing Lewis and Brønsted acid sites into the skeleton surface of three-dimensional ordered macroporous (3DOM) CeO2. By a systematic study, we find that the introduction of Lewis acid sites can enhance the redox capacity of CeO2, while the surface Brønsted acid sites of the material promote chlorobenzene (CB) degradation through hydrolysis that is an effective degradation route to generate less chlorinated organic by-products. The optimal S–Ce0.7Zr0.3O2 with both abundant surface Lewis and Brønsted acid sites presents a stable activity and only 1.2% Cl2 selectivity with ∼90% CB conversion at 410 °C for 24 h. This work reveals the different roles and synergistic effects of Lewis and Brønsted acid sites to develop environmentally friendly CVOC combustion catalysts.
研究领域:
环境科学
·
催化
·
化学工程
·
污染控制
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2020
·Vol. 30
·期 45
·2004692
·
IF 16.836
Sheng Zhao,Yixuan Li,Quanyi Liu,Sirong Li,Yuan Cheng,Chaoqun Cheng,Ziying Sun,Yan Du,Christopher J. Butch,Hui Wei
Safe, effective, and convenient administration of therapeutic nanomaterials is one of the greatest difficulties in nanomedicine. To tackle this challenge, a system which couples multi-enzyme mimicking CeO 2 nanoparticles with clinically approved montmorillonite (MMT) for inflammatory bowel disease (IBD) therapy is reported. CeO 2 exhibits superoxide dismutase- and catalase-like activities, and hydroxyl radical scavenging activity, making it more efficient at scavenging reactive oxygen species (ROS) than non-catalytic antioxidants while being more stable than free enzymes. In addition, negatively-charged MMT can be orally administered and specifically adsorbed onto positively-charged inflamed colon tissue via electrostatic interactions for targeted delivery. When the two are assembled together by in situ growth of CeO 2 onto MMT, the optimized CeO 2 @MMT(1:9) is stable in the stomach for oral delivery, targets the inflamed colon through electrostatic interactions, and reduces inflammation through ROS scavenging, all without any significant systemic exposure as demonstrated by the relief of murine IBD in vivo.
研究领域:
纳米医学
·
药理学
·
炎症研究
·
治疗递送系统
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Meisheng Zhang,Baofang Jin,Yan Liu,Wei Liu,Duan Weng,Xiaodong Wu,Shuang Liu
In this work, O 3 activation was performed at 200 °C over two types of Ag/CeO 2 catalysts with nanocube- and nanorod-like morphologies, respectively. The O 3 -indcued surface O x − species (“O x − injection”) accelerated soot combustion over both catalysts temporarily. In contrast, the depletion of CeO 2 surface oxygen vacancies (Ce 3+ -V O-s ) caused by ozonization conferred to long-term activation. Specifically, the ozonized nanocubic Ag/CeO 2 with low initial Ce 3+ content not only benefited more from the “O x − injection”, but also exhibited good redox stability and high practical potential. Therefore, the combination of this catalyst with O 3 activation may result in efficient soot elimination in the particulate filters of vehicles.
研究领域:
催化
·
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）