ACS Applied Materials & Interfaces
·
2014
·
IF 5.9
Lingling Wang,Hui Huang,Songhua Xiao,Daoping Cai,Yuan Liu,Bin Liu,Dandan Wang,Chenxia Wang,Han Li,Yanrong Wang,Qiuhong Li,Taihong Wang
We report a room-temperature NH3 gas sensor with high response and great long-term stability, including CeO2 NPs conformally coated by cross-linked PANI hydrogel. Such core–shell nanocomposites were prepared by in situ polymerization with different weight ratios of CeO2 NPs and aniline. At room temperature, the nanohybrids showed enhanced response (6.5 to 50 ppm of NH3), which could be attributed to p–n junctions formed by the intimate contact between these two materials. Moreover, the stability was discussed in terms of phytic acid working as a gelator, which helped the PANI sheath accommodate itself and enhance the mechanical strength and chemical stability of the sensors by avoiding “swelling effect” in high relative humidity. The sensors maintained its sensing characteristic (response of ca. 6.5 to 50 ppm of NH3) in 15 days. Herein, the obtained results could help to accelerate the development of ammonia gas sensor.
研究领域:
材料科学
·
传感器技术
✓ 已验证
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Dandan Wang,Jing Li,Rong Zhang,Beiyu Xin,Xueru Huang,Yang Wang,Jifeng Guo
Microcystis aeruginosa (M. aeruginosa) is a typical harmful algal associated with eutrophication, making the study of its inactivation critical for water restoration. In this research, g-C 3 N 4 /CeO 2 composites with S-scheme heterojunctions were synthesized and incorporated into sodium alginate (SA) to successfully prepare photocatalytic gel beads with floating capabilities. A photocatalytic persulfate (g-C 3 N 4 /CeO 2 /SA/Vis/PMS) system was developed to systematically investigate the algal inactivation efficacy of floating catalysts. The g-C 3 N 4 /CeO 2 S-scheme heterojunctions significantly enhanced algal inactivation efficiency, achieving up to 96.65 % inactivation within 80 min. The alterations in algal cell properties during the inactivation process were examined. A decrease in the content of algal bile proteins indicated a disruption of the photosynthetic system within the algal cells, while an increase in the concentrations of K + , Ca 2+ , and Mg 2+ suggested further disruption of algal cell membranes and walls. Additionally, three-dimensional fluorescence spectroscopy (EEM) results indicated that the extracellular organic matter produced during the rupture of algal cells was degraded into humic acid-like substances. The energy bands and electronic structure of g-C 3 N 4 /CeO 2 were calculated using density functional theory (DFT) to analyze the electron transfer mechanism involved in this process, which is consistent with the S-scheme electron transfer pathway. The effective inactivation of M. aeruginosa was successfully achieved through the combined action of the non-radical 1 O 2 ,·O 2 – , and h + generated during the photogenerated carrier transfer process. This approach offers a promising strategy for the management of algal blooms in eutrophic waters.
研究领域:
环境科学
·
微生物学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2024
·
IF 6.7
Bin Fu,Yuqiong Zhao,Shipeng Zhang,Ying Wang,Jun Liu,Guojie Zhang
Nickel-based catalysts frequently encounter significant challenges in achieving both high CO 2 conversion and superior CO selectivity during reverse water gas shift (RWGS) reactions. To address this issue, we developed a facile strategy to prepare highly dispersed Ni/CeO 2 catalysts by forming Ce 1−x Ni x O 2−y solid solutions. Under conditions of 300–600 °C, 0.1 MPa, and a gas hourly space velocity (GHSV) of 40,000 mL g cat −1 h −1 , the 5Ni/CeO 2 -A catalyst exhibited outstanding selectivity, approaching 100 %. The RWGS reaction rate reached 1332 μmol CO g Ni −1 s −1 and maintained stable for 50 h almost without deactivation. The formation of Ce 1−x Ni x O 2−y solid solution uniformly disperses numerous Ni species in the CeO 2 lattice, effectively inhibiting Ni aggregation. This highly dispersed Ni weakens CO adsorption and facilitates its direct desorption without excessive hydrogenation. Moreover, the catalyst remains well-dispersed state even after reduction. The formed Ce 1−x Ni x O 2−y solid solution generates abundant oxygen vacancies on the catalyst surface, enhancing H 2 dissociation. The catalyst’s pore size distribution is also modified, creating stacked pores that favor reactant diffusion and expose more active centers. In-situ DRIFTS experiments demonstrate that Ce-OH plays a pivotal role in CO 2 adsorption on the 5Ni/CeO 2 -A catalyst, while the stabilization of bicarbonate and formate intermediates by the highly dispersed Ni further promotes catalytic performance. This study introduces a novel preparation method and provides valuable insights for designing Ni-based catalysts with exceptional CO selectivity.
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2018
·
IF 3.849
Yuanfeng Wu,Xianghai Song,Jiahui Zhang,Shuai Li,Xinghui Yang,Huazheng Wang,Ruiping Wei,Lijing Gao,Jin Zhang,Guomin Xiao
A series of Ce 1- x Cd x O mixed oxide catalysts prepared by co-precipitation method were tested for synthesis of glycerol carbonate (GC) from glycerol and diethyl carbonate (DEC). The microstructural and physicochemical properties of the bimetal catalysts were characterized by XRD, SEM, TEM, XPS, CO 2 -TPD, N 2 -adsorption, TG-DSC and 1 H NMR. The results show that the spherical particles of CdO were uniformly dispersed on the surface of lamellar CeO 2 . Besides, a noticeable increase was observed in the moderate basic sites concentration, because more oxygen atoms were adsorbed on the bimetal sample surface which was attributed to Ce 4+ doped into CdO lattice. The Ce 0.7 Cd 0.3 O sample annealed at 500 °C was observed with the highest catalytic activity. 96.84% of glycerol conversion and 100% selectivity to GC were obtained over this catalyst under the optimized conditions (5 wt.% catalyst of glycerol, 90 °C, 180 min, glycerol/DEC molar ratio of 1:3). Besides, it was found that the conversion of glycerol carbonate was synergistically accelerated by the moderate and strong basic sites.
研究领域:
催化化学
·
材料科学
·
绿色化学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Jinming Chen,Powei Gu,Yuting Guan,Haifeng Su
Herein, an effective solid-state pyrolysis method was employed to synthesize CeO 2 (Ce)/biomass carbon(C)@g-C 3 N 4 photocatalyst , which was then used to degrade methylene blue (MB) with high efficiency under visible light irradiation. After 60 min of visible light irradiation, the MB removal rate of Ce/C@g-C 3 N 4 composite photocatalyst reached 96.8%, while the MB removal rates of CeO 2 and g-C 3 N 4 were only 37.8% and 56.3%, respectively. According to the BET and PL results, the Ce/C@g-C 3 N 4 composite material possesses a specific surface area and a low electron-hole recombination rate. The findings of free radical capture experiments and ESR analysis indicated that electron-holes (h + ) and superoxide radicals (•O 2− ) are the most active groups in photodegradation reactions using Ce/C@g-C 3 N 4 composite. Furthermore, after five consecutive cycles, the photocatalytic activity of the Ce/C@g-C 3 N 4 composite material remained steady. This work provides a facile approach for the fabrication of highly stable Ce/C@g-C 3 N 4 photocatalyst with high photocatalytic activity making it a promising material for the photodegradation of methylene blue under visible-light conditions.
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
Energies
·
2024
·Vol. 17
·期 24
·6314
·
IF 3
Zhiyin Zhang,Huimin Hu,Jie Yang,Zhengguang He,Kai Yan,Tianyu Liu,Chang Wen
The photo-thermochemical cycle (PTC) for water splitting offers a sustainable method for hydrogen production by efficiently utilizing solar energy. This study explored the use of CeO2as a catalyst in the PTC system to enhance hydrogen yield. A nanostructured CeO2catalyst was synthesized via the sol-gel method, achieving an H2yield of 8.35 μmol g−1h−1. Stability tests over five cycles showed consistent yields between 7.22 and 8.35 μmol g−1h−1. Analysis revealed that oxygen vacancies (VOs) increased after the photoreaction and depleted during the thermal reaction, which aligns with the expected PTC mechanism for hydrogen production. Single-factor experiments highlighted that photoreaction duration mainly influenced VOs generation, while thermal duration and temperature impacted VOs consumption and intermediate reaction rates. A response surface methodology (RSM) model predicted optimal conditions for maximum H2yield (8.85 μmol g−1h−1) with a photoreaction duration of 46.6 min, thermal duration of 45.4 min, and thermal temperature of 547.2 °C.
研究领域:
材料科学
·
能源科学
·
催化化学
✓ 已验证
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2019
·Vol. 6
·期 11
·3255-3263
·
IF 5.934
Yue Yu,Xiaolei Peng,Usman Ali,Xianchun Liu,Yan Xing,Shuangxi Xing
Highly efficient bifunctional electrocatalysts for both the oxygen reduction reaction and oxygen evolution reaction are essential for the development of rechargeable metal–air batteries. Herein, we demonstrate a novel bifunctional electrocatalyst with CeO2 and Co nanoparticles being embedded in N-doped carbon, which is achieved via pyrolyzing CeO2@zeolitic imidazolate framework-67 particles. In 0.1 M KOH aqueous solution, CeO2/Co@N-doped carbon shows an excellent electrocatalytic performance with an oxygen reduction reaction onset potential of 0.998 V vs. a reversible hydrogen electrode with an oxygen evolution reaction overpotential of 474 mV at 10 mA cm−2. The liquid rechargeable Zn–air battery that is assembled by using CeO2/Co@N-doped carbon as the air cathode shows excellent charge/discharge performance, with an open-circuit potential of 1.42 V and a maximum power density of 102.69 mW cm−2. Furthermore, the rechargeable Zn–air battery exhibits stable cycling performance at a constant current density of 5 mA cm−2 after 70 hours, with a charge/discharge gap of only 0.8 V and round-trip efficiency of ca. 59%. The remarkable bifunctional properties are considered to arise from the synergistic effect between the N-doped carbon and CeO2 nanoparticles, where abundant Ce3+ and oxygen vacancies in CeO2 are generated and more defect sites are available in N-doped carbon.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Lu Ji,Conghui Che,Fang Li,Wei Xue,Xiaoshu Ding,Dongsheng Zhang,Jing Li,Xinqiang Zhao,Yanji Wang
Methoxycarbonylation of aniline (AN) with dimethyl carbonate (DMC) to produce methyl N-phenylcarbamate (MPC), a key intermediate in non-phosgene diphenylmethane diisocyanate (MDI) synthesis, is facilitated using a newly developed CuO–CeO2 catalyst. This catalyst demonstrated a high AN conversion rate of 95.1% and an MPC selectivity of 92.7% at an nDMC/nAN ratio of 10. The catalyst's effectiveness is attributed to the synergistic interaction between CuO and CeO2, which enhances oxygen vacancy generation and increases the acid amount, as well as Lewis acid sites. Weak Lewis acid sites are conducive to MPC synthesis. There are three distinct copper species present in the CuO–CeO2 catalyst, among which the copper species doped into the CeO2 lattice is beneficial to MPC synthesis. The deactivation of the catalyst, due to the reduction of CuO by methanol, and catalyst regeneration through calcination are discussed. The catalytic mechanism is explored with in situ FT-IR, providing deeper insight into the methoxycarbonylation process.
研究领域:
化学工程
·
催化材料科学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL TECHNOLOGY
·
2014
·
IF 1.197
Rui-tang Guo,Wen-long Zhen,Wei-guo Pan,Jie-nan Hong,Qiang Jin,Cheng-gang Ding,Shi-yi Guo
CeO2–CuO/Al2O3 catalysts were prepared by three different methods and their activities for selective catalytic reduction (SCR) of NO with NH3 were investigated. As can be seen from the experimental results, the catalyst prepared by the single-step sol–gel (SG) method showed the best SCR activity and resistance to SO2 and H2O. In order to investigate the relationship between the preparation method and the performance of SCR catalysts, the catalysts were characterized by using Brunauer–Emmett–Teller, X-ray diffraction, temperature programmed reduction with hydrogen, temperature programmed desorption with ammonia, X-ray photoelectron spectroscopy, Fourier transform infrared and thermo-gravimetric analysis techniques. It was found that the excellent performance of CeO2–CuO/Al2O3 catalyst prepared by the single-step SG method should be resulted from its large surface area, low crystallinity, high oxygen storage capacity, high NH3 adsorption capacity, high concentration of surface chemisorbed oxygen, weak sulphation process and weak water absorption.
研究领域:
环境科学
·
催化材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Functional Materials Letters
·
2020
·
IF 2
Quan Diao,Yuna Yin,Xiaomei Zhang,Jie Li,Mingli Jiao,Jian Cao,Qi Qin,Kai Yang,Genxing Zhu,Xiumei Xu
ZnO@CeO 2 core–shell hetero-structural nanofibers (NFs) were synthesized by a coaxial electrospinning method and the materials characterization results proved that the core–shell hetero-structure was formed. Furthermore, the sensing properties test indicated that the ZnO@CeO 2 NFs exhibited higher response values and enhanced selectivity to acetone in low concentration range (0.2–10 ppm) compared with ZnO and CeO 2 NFs, which showed the potential value in the field of diabetes diagnose. It is suggested that the enhanced sensitivity to acetone is attributed to the synergistic effect of one-dimensional (1D) structure and the formation of ZnO and CeO 2 hetero-structure.
研究领域:
材料科学
·
医学检测
✓ 已验证
产品关联
DOI
高影响因子
ACS Nano
·
2025
·
IF 16
Zhipeng Guo,Tingting Zhang,Zhao Chen,Junpeng Niu,Md Rasel,Enze Luo,Yuetong Li,Nan Xu,Mahmood Ul Hassan,Hafiz Abdul Kareem,Quanzhen Wang,Xuebing Yan,Yuxia Guo
“Nanophytovirology” is a potential management approach to combat plant viral diseases. Herein, the impact of foliar application of CeO2 nanoparticles (CeO2-NPs) on the growth, plant cell ultrastructure, and physiology of alfalfa mosaic virus (AMV)-infected alfalfa seedlings was explored at different concentrations and application strategies. In a solar greenhouse, 20 mL of CeO2-NP suspensions of 50, 100, 200, and 500 mg/L was sprayed onto the plant surface every other day for 9 days. As a result, the total volume applied per pot was 100 mL. It showed that the beneficial effects of CeO2-NPs on infected alfalfa seedlings were dependent on the concentration and application period. Compared to the infected control, foliar application with 100 mg/L CeO2-NPs before AMV infection (CeO2-NPs-BVI) showed the greatest virus suppression efficacy; significantly reduced the disease indices by 58.87%; improved growth, yield, and nutritional quality; and significantly increased plant height, plant dry biomass, crude protein, and crude fat contents and relative feeding value by 15.17, 37.12, 18.77, 71.19, and 10.09%, respectively. Moreover, CeO2-NPs-BVI maintained the chloroplast quantity and structure of leaf cells and significantly enhanced the chlorophyll content and photosynthesis rate of alfalfa leaves by 36.14 and 40.13%, respectively, as compared to infected control. Mechanistically, cell ultrastructure, physiology, and transcriptomic analyses revealed that (1) CeO2-NPs effectively mitigated AMV-induced chloroplast structure damage, subsequently enhancing photosynthesis and carbon fixation in photosynthetic organisms, providing sufficient energy and antiviral activities for maintaining plant growth and development; (2) CeO2-NPs reduced the AMV’s ability to bind to host receptors and evade host immune recognition, significantly activating and boosting plant systemic immunity by down-regulating ABA and ETH levels and upregulating SA, IAA, and BR levels; (3) CeO2-NPs activated the plant antioxidative systems to eliminate excess reactive oxygen species. These findings provide significant insight into the potential of CeO2-NPs as highly efficient antiviral agent.
研究领域:
植物学
·
病毒学
·
纳米生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2021
·Vol. 168
·期 4
·044516
·
IF 4.316
Lei Yanhua,Ning Tan,Da Huo,Mengchao Ding,Yuliang Zhang,Tong Liu,Ruixuan Yu,Sha Cheng,Runhua Fan
The oxygen reduction reaction (ORR) is a crucial cathodic process and a technology providing renewable energy. It is essential to create ORR catalysts not containing noble metals yet still affordable and possessing high-efficiency and long-term durability. Therefore, this work developed a highly porous N-doped carbon catalyst embedded with CeO2 nanoparticles (NPs). This composite catalyst was synthesized by pyrolysis of PANI-encapsulated CeO2 NPs (CeO2/PANI) combined with in situ polymerization. The resulting catalyst exhibited an outstanding ORR performance with 0.94 and 0.81 mV onset and positive half-wave potentials, respectively, and 5.52 mA cm−2 diffusion-limited current density. The catalyst also demonstrated excellent stability. These exceptional characteristics indicate that a synergy of the N-doped carbon and CeO2 NPs provide a novel strategy of fabrication of novel ORR catalysts without using noble-metals for applications related to fuel cells and metal-air batteries.
研究领域:
材料科学
·
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）