ChemNanoMat
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2017
·Vol. 4
·期 2
·213-219
·
IF 2.937
Xuan Cai,Libo Shi,Hongli Zhao,Minbo Lan
Graphical It's super ! The p-n junction was introduced to electrochemical catalysts for superoxide detection. Based on the superoxide dismutase mimic activity of CeO 2 and the high electrochemical catalytic activity of CuO, a non-enzymatic superoxide sensor was established. Owing to the construction of a p-n heterojunction, the sensing performances of p-CuO/n-CeO 2 composites were further enhanced. This method could serve as an effective strategy to overcome the intrinsic defects of semiconductor catalysts and improve their applications in electrochemical sensors. The performance of electrochemical sensors is mainly limited by the intrinsic properties of electrocatalysts fabricated on the electrode. Introducing a p-n heterojunction into semiconducing electrocatalysts is an effective strategy to enhance the sensing performance. In this paper, p-n-heterojunction-based CuO/CeO 2 nanocomposites were synthesized by a simple hydrothermal process, and the effect of different Cu/Ce molar ratios was explored. p-CuO/n-CeO 2 was found to exhibit higher conductivity and electrocatalytic activity toward the target superoxide anion (O 2 .− ) when compared to both bare CuO and CeO 2 . Characterization shows that different Cu/Ce ratios in p-CuO/n-CeO 2 materials result in a considerable variation in the Ce 3+ /Ce 4+ level, and energy band gap of CeO 2 , greatly affecting the electrochemical performance of p-CuO/n-CeO 2 . Under optimized conditions, these sensors exhibit high sensitivity and low detection limit toward O 2 .− . These results demonstrate that the performance of semiconductor-based electrochemical sensors may be enhanced by the electron-transfer process of p-n junction interfaces.
研究领域:
分析化学
·
生物医学工程
·
材料科学
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产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2024
·
IF 3.8
Ci Li,Conghui Che,Fang Li,Wei Xue,Jing Li,Xinqiang Zhao,Yanji Wang
Ce-based composite oxides were used for catalyzing the methyl N-phenyl carbamate (MPC) synthesis from aniline and dimethyl carbonate. Among them, CuO–CeO2 exhibited the best catalytic performance. Characterization results showed that the second metal (Cu, Zn, Mn, Co, and Zr) can be doped into the CeO2 lattice and led to strong interactions, modifying the content of Ce3+, oxygen vacancy, and acidity of the catalyst. Notably, Ce3+, oxygen vacancies, and weak Lewis acid sites are beneficial to MPC synthesis. Additionally, CuO–CeO2–M, prepared by mechanical mixing, exhibited better catalytic activity than CuO–CeO2–C prepared by co-precipitation. This was due to the preparation method affecting the interaction between CuO and CeO2. CuO primarily interacted with CeO2 through interfacial contact in CuO–CeO2–C, whereas the interaction in CuO–CeO2–M involves both this interfacial contact effect and the presence of solid solution structures, thereby influencing the content of Ce3+, oxygen vacancy, and acidity.
研究领域:
化学
·
催化材料科学
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DOI
高影响因子
ACS Omega
·
2023
·
IF 4.1
Yanghao Meng,Hongbiao Du,Shuai Lu,Yanwei Liu,Jinglai Zhang,Hualong Li
Hydrothermal liquefaction (HTL) is one of the most promising technologies for biofuel production. The preparation and application of catalysts for HTL have been the research focus in recent years. In this study, a new synergistic catalytic process strategy is proposed. CuO–CeO2/γ-Al2O3 was used as an in situ hydrogen donor catalyst and Ni–Co/SAPO-34 was synthesized for hydroprocessing to improve bio-oil production process. The results of XRD and XPS demonstrated that the metal components were well supported on the catalyst. When the two catalysts were mixed, the yield of bio-oil increased from 51.00% to 64.51%, the carbon recovery rate raised from 69.53% to 88.18%, the energy recovery rate grew from 63.42% to 80.22%, and the S content is relatively reduced by 83.3%. Also, TG analysis showed that the content of light components in bio-oil increased. Moreover, the hydrocarbons and alcohols were observed to a higher proportion from the GC-MS analysis. This new method still has high catalytic activity after repeated use for five times. This study provides a new idea for preparing higher yield and superior quality bio-oil.
研究领域:
能源生物学
·
催化化学
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产品关联
DOI
PubMed
高影响因子
FUEL
·
2023
·
IF 7.4
Yiqing Zeng,Weilong Rong,Shule Zhang,Qin Zhong,Zhaoxiang Zhong
Synergistic control of multiple pollutants has high benefits during the control of emissions from fuel utilization, and catalysis can contribute to efficient removal of multiple pollutants. In this work, Ti species regulated CuO/CeO 2 (Cu/Ce) catalyst was constructed to efficient simultaneous NH 3 -SCR denitration and CO oxidation under oxygen-rich conditions. It is found that the introduction of Ti species into Cu/Ce catalyst induces the formation of three-dimensional pore structure and promotes the phase transition from crystalline to amorphous, which significantly enhances the specific surface area and the dispersion of CuO and CeO 2 . The well dispersed CuO and CeO 2 species provide a larger number of adsorbed sites for CO and NO and enhance the Cu-Ce interaction, which can contribute to reducing the competitive adsorption between CO and NO and the formation of a richer surface oxygen vacancies. Owing to above improvements, the Ti species regulated Cu/Ce catalyst can achieve more than 90% removal efficiency of NO x and CO at 148–218 °C, and the active temperature windows widened by 36 °C in comparison with Cu/Ce catalyst. Through this work, we expect to shed some light on the synergistic control of CO and NO x under oxygen-rich conditions.
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DOI
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2026
·
IF 4.7
Huitian Zhi,Lingwei Bu,Ruhui Shang,Xujie Wang,Yingchao Yang,Wanyu Zhang,Zhengquan Yan,Lei Hu
Food health and safety is one of the hottest topics to affect human life nowadays. To reliably detect toxic S 2− and to normalize bioactive ascorbic acid (AA), a kind of tiny CuO/CeO 2 modified bovine serum albumin (CuO/CeO 2 @BSA) was prepared under microwave-assisted conditions. Not only did the modification of BSA to CuO/CeO 2 nanospheres endow CuO/CeO 2 @BSA with high stability and an average mesoporous pore of 3.88 nm, it exhibited outstanding oxidase-like activity to catalyze the oxidization of 3,3′,5,5′-tetramethyl benzidine (TMB) with V max / K m of 0.15 mM/5.96 × 10 −8 M·s −1 . The presence of trace S 2− or AA could exclusively deteriorate the characteristic UV–vis absorbance intensity at 652 nm ( A 652 ) of CuO/CeO 2 @BSA-TMB with obvious hypochromic effect from dark blue to light blue. Under the optimal oxidase-mimic conditions, CuO/CeO 2 @BSA-TMB was applied for potable UV–vis spectral/smartphones-assisted red-green-blue (RGB) monitoring of S 2− or AA in complex agricultural products with detection limits as low as 9.2 × 10 −9 /4.0 × 10 −8 M or 6.1 × 10 −8 /7.2 × 10 −8 M. The analysis accuracy was reliable from comparing their F and t values and the detection mechanisms were proposed. It will shed a potential for portable monitoring of analytes in food samples practically.
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DOI
高影响因子
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