Nanotechnology Reviews
·
2021
·Vol. 10
·期 1
·385-400
·
IF 7.848
Shengli Liang,Shuang Liu,Yi Zhang,Meng Zhou,Baohong Tian,Yongfeng Geng,Yong Liu,Yanlin Jia,Xu Li,Alex A. Volinsky
The graphene oxide (GO)-doped nano-CeO 2 was introduced into Cu30Cr10W electrical contact composites by ball milling dispersion, freeze-drying, and spark plasma sintering, resulting in excellent mechanical strength and high arc erosion resistance. The effects of GO and CeO 2 on the microstructure and properties of the composites were investigated. The arc erosion behavior was investigated by the JF04C electrical contact testing apparatus. Consequently, the uniform distribution of CeO 2 nanoparticles hinders the movement of dislocations, GO transformed into reduced graphene oxide (rGO) during high-temperature sintering, and the in situ formation of Cr 3 C 2 between trace carbon atoms and chromium particles at the C–Cu interface, which enhanced the interface combination. Compared with Cu30Cr10W composites, the tensile strength of the two composites was increased by 47 and 36% by importing GO and nano-CeO 2 , respectively. Finally, electrode material migrated from the cathode to the anode, and the rGO delayed the formation of pits and sharp bumps on the contact surface of the electrode and inhibited diffusion of molten metal; when compared with Cu30Cr10W, the GO/CeO 2 –Cu30Cr10W composites have better welding force.
Graphical abstract
研究领域:
材料科学
·
电气工程
✓ 已验证
产品关联
DOI
高影响因子
NANO
·
2017
·
IF 1.025
Longfeng Li,Chengyu Li,Mingzhu Liu,Cheng Wang
The catalytic performance of ceria oxide (CeO 2 ) was greatly influenced by the materials’ structure and surface area. In this paper, CeO 2 porous nanospheres (PNS) with tunable pore and sphere sizes were synthesized by a solvothermal method using diethylene glycol as reaction media. All the as-synthesized CeO 2 PNS presented good adsorption capacity for methyl orange, which makes them potential application in waste water treatment conveniently and economically. The control over the sphere and pore sizes of CeO 2 PNS was achieved by regulating the volume of water bubble in the reaction system, which supplied limited room for the assembling of preformed CeO 2 small nano-precursors.
研究领域:
材料科学
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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
Pengchao Ren,Weifeng Tu,Chanchan Wang,Sifan Cheng,Wenqi Liu,Zhenzhou Zhang,Yun Tian,Yi-Fan Han
This study investigated the Cu-CeO 2 interactions for CO hydrogenation to methanol by applying rate measurements, chemical titration/desorption, together with in-situ/operando spectroscopy techniques under realistic reaction conditions. Ce components were enriched in the surface region of Cu/CeO 2 catalysts while Ce 3+ and Ce 4+ atoms co-existed during CO hydrogenation. The ratio of Ce 3+ to Cu 0 in the surface region of catalysts increased linearly with the Ce content. The turnover rates of CH 3 OH formation increased as a single-valued function of the ratio, irrespective to the individual contact extent between Cu and CeO 2 clusters or Ce content in the Cu/CeO 2 catalysts, indicating that the Cu 0 -Ce 3+ sites pair acts as active sites for CO hydrogenation to methanol over Ce-CeO 2 samples. This study also unraveled that formyl and formate species, as reactive surface intermediates, were co-adsorbed on the Cu 0 -Ce 3+ sites, and their hydrogenation routes occurred concurrently for CH 3 OH formation during CO-H 2 reactions.
研究领域:
催化
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化学工程
·
表面科学
✓ 已验证
产品关联
DOI
高影响因子
Applied Materials Today
·
2019
·
IF 8.013
Jiachen Ge,Xuanyu Yang,Jiahang Luo,Junhao Ma,Yidong Zou,Jichun Li,Wei Luo,Xiaowei Cheng,Yonghui Deng
With increasing requirements of replacing the high-cost and unstable natural enzymes, the rational design of highly efficient inorganic mimetic enzymes (nanozymes), as one of the most important bioactive materials, has attracted more and more attention in recent years. In our work, using the solvent evaporation induced co-assembly strategy with high-molecular weight poly(ethylene oxide)-block-polystyrene (PEO- b -PS) diblock copolymer as the template and two metal salts as the co-precursors in one-pot system, we synthesized ordered mesoporous heteroatom-doped CeO 2 with high surface area, bimodal pore sizes and highly crystallized walls. The composite materials were then constructed as the mimetic enzymes to investigate their peroxidase-like catalytic performance and detect H 2 O 2 and glucose as bioactive materials in diverse systems including complex biological samples. It was demonstrated that mesoporous 5%CoO/CeO 2 catalyst was the best peroxidase mimic, following the typical Michaelis–Menten kinetics and exhibiting the excellent peroxidase-like catalytic performance toward 3,3′,5,5′-tetramethylbenzidine (TMB) with comparable K m and V m values to horseradish peroxidase (HRP) enzyme. A highly sensitive and selective colorimetric assay was developed to detect H 2 O 2 and glucose with detection limits of 0.88 and 19.6 μM, respectively. The promising catalytic behavior of mesoporous 5%CoO/CeO 2 as the peroxidase-like bioactive catalyst could be ascribed to its interconnected large mesopores, rich exposed surface defects and oxygen vacancies introduced by the heterojunction interface of ultrasmall CeO 2 and CoO nanocrystals within pore walls.
研究领域:
材料科学
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生物催化
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纳米医学
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2025
·
IF 3.7
Runze Dong,Wenhao Li,Qiyu Yang,Ping Li,Pan Zhang,Lemeng Wang,Dong Fu
How to achieve low energy consumption and high degradation efficiency (DRE) under mild conditions is an important issue in the field of sulfur hexafluoride (SF 6 ) treatment. In this work, a new route of SF 6 degradation promoted by Ni-doped ceria (NiO-CeO 2 ) in a packed bed dielectric barrier discharge (PB-DBD) was proposed. The effects of Ni/Ce molar ratio, input power, SF 6 concentration and flow rate on the DRE of SF 6 were investigated. Compared with DBD or CeO 2 -DBD alone, the combination of DBD and NiO-CeO 2 can significantly promote the SF 6 degradation at lower input power. The Experimental results show that when the dosage of catalyst 1.5NiO-CeO 2 (Ni/Ce mole ratio is 1.5%) is 5 g, DBD input power is 50 W and SF 6 (1.5% SF 6 /98.5% Ar) flow rate is 100 ml·min −1 , the highest DRE can reach 97.7% and the energy yield can reach 11.5 gSF 6 ·(kWh) −1 . Adjusting the catalyst dosage according to the flux of SF 6 ( e.g., using 10 g catalyst to degrade SF 6 with a concentration of 1.5% and a flow rate of 80 ml·min -1 ), the DRE of nearly 99% can be achieved for a long time, which is crucial for industrial application. The mechanism deduction shows that the rich surface and mesopores of the catalyst are beneficial to the adsorption of SF 6 and intermediates, while the doping of Ni can significantly increase the content of oxygen vacancies to improve the degradation. Meanwhile, when NiO-CeO 2 is activated by DBD, the free O· can further promote the degradation. It is this coupling effect that leads to the high efficiency and low energy consumption of SF 6 degradation under mild conditions. It can be expected that this coupling technology route will have a good application prospect in the field of SF 6 treatment.
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
LIQUID CRYSTALS
·
2024
·
IF 2.4
Yuzhen Zhao,Yongle Wu,Xiangke Jiao,Ruijuan Yao,Zhun Guo,Jianjing Gao,Yang Zhao,Dong Wang
In this manuscript, the triple-layer PDLC device with progressive driving function was prepared by integrating three single-layer PDLCs with different electro-optical properties. In comparison with conventional single-layer PDLC, triple-layer PDLC is capable of achieving controllable transmittance by regulating the applied voltage under low-voltage conditions. The optimal ratio and polymerisation conditions were explored by introducing oleic acid modified CeO2 nanospheres and adjusting the polymerisation temperature as well as the UV light intensity. It was found that the polymer network morphology was affected by CeO2 nanospheres content, polymerisation temperature, and UV intensity, which led to changes in the electro-optical properties of the triple-layer PDLC. The samples obtained under the optimal ratio and process conditions exhibited a 77% acceleration in rise response time (ton) compared to the original conditions, while still maintaining excellent progressive driving performance. Its potential for application in the field of intelligent display windows has been significantly enhanced by these advantages.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
junhai Wang,ruoxuan Peng,Yuan-Hao Zhu,changjun You,yuan Yin,boyi Yang,yitao Si,Jiancheng Zhou
Photothermal catalytic conversion of CO2 with H2O has exhibited improved performance in solar-to-chemical (STC) energy conversion efficiency. However, the limited rate of photocatalytic half reactions has generally hindered the full exploitation of solar energy. To address this issue, we developed a CeO2/WO3 catalyst to facilitate the photoconversion process. Under concentrated light irradiation, the energy conversion efficiency of STC was increased to 0.356 ‰, which is 27.9 times higher that under non-concentrated light irradiation. The product amount of C2H4 increased from 4.36 µmol·g-1·h-1 to 124.21 µmol·g-1·h-1, representing a 27.5-fold increase. This success could be attributed to the photo-thermal synergistic effects which provided the photoexcited carriers with additional kinetic energy. Besides, the abundance of active sites at the heterojunction interfaces shortened the charge transfer distance and facilitated C-C coupling. This research contributes to the efficient and environmentally friendly use of solar energy to drive CO2 conversion with photothermal catalytic systems, and highlights the critical importance of heterojunction interfaces during the photocatalytic reactions.
研究领域:
催化化学
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能源科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Mengxue Wang,Ziliang Jia,Xintong Ji,Yuxuan Zhou,Shuning Li,Miao Wang,Meisheng Liang,Xi Chen
Compared to noble metal catalysts at the nanoscale, single-atom catalysts are more likely to be poisoned then lead to the loss of activity during the catalytic oxidation of chlorinated volatile organic compounds (CVOCs) due to their unique coordination environment. Additionally, the commonly used low loading single-atom catalysts often suffer from limited active sites and low catalysts activities. Therefore, it is of great significance to synthesize stable and high-loading single-atom catalysts for CVOCs oxidation. In this study, a highly loaded (2.4 wt%) atomically dispersed 4RuCeO 2 -AA catalyst was synthesized through defect designing for the catalytic combustion of chlorobenzene (CB). By introducing defect sites on the CeO 2 supports using ascorbic acid, more atomically dispersed Ru were strongly anchored, significantly increasing the number of active sites and oxygen vacancies. With the same noble metal contents, the 4RuCeO 2 -AA catalyst exhibited superior performance in both CO 2 selectivity (99.6 % at 240 °C) and catalytic stability (no decay for 20 h). This enhanced performance can be attributed to the high dispersion of RuO x , strong Ru-O-Ce bonding energy, and an increased of chemically adsorbed oxygen, as well as the presence of strong Brønsted acid sites.
研究领域:
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2019
·Vol. 10
·期 3
·788-800
·
IF 5.726
Rong Ji,Zhi Zhu,Wei Ma,Xu Tang,Yang Liu,Pengwei Huo
A new 2D/2D heterojunction of MoS2/CeO2 is successfully prepared by a facile hydrothermal method. The MoS2/CeO2 heterojunction demonstrates superior photocatalytic performance for the degradation of ciprofloxacin (CIP) to that of pure MoS2 and CeO2. The enhanced degradation efficiency of the MoS2/CeO2 heterojunction is on account of the 2D/2D structure, which not only accelerates the interfacial charge separation but also endows the heterojunction with numerous reactive sites to facilitate the degradation reaction. Meanwhile, the Ce4+ ions in 2D CeO2 serve as the redox centers and utilize the photogenerated carriers to generate more oxygen vacancies. In addition, this paper also carefully discusses the possible photocatalytic reaction mechanisms for the transfer behaviors of charge carriers, generation of reactive species and intermediate degradation products by electrochemical impedance spectroscopy (EIS), electron spin resonance (ESR) and HPLC-MS analysis. This work may provide a promising approach for synthesizing 2D/2D heterojunctions in photocatalytic degradation.
研究领域:
材料科学
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环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2022
·Vol. 24
·期 18
·3369-3379
·
IF 3.756
Yang Xu,Xiaodong Hao,Xishuo Zhang,Tong Wang,Zhuangzhuang Hu,Yujiao Chen,Xinyi Feng,Wen Liu,Fangyuan Hao,Xingang Kong,Chaozheng He,Shufang Ma,Bingshe Xu
Oxygen vacancy (VO) engineering has proved to be an effective approach for improving the hydrogen evolution reaction (HER) performance of low-cost metal oxide electrocatalysts. Cerium dioxide (CeO2), an abundant rare-earth metal oxide, is famous for its easy formation of VO and high oxygen mobility, which is believed to be conducive to its application in electrocatalytic HER. Herein, this study reports a facile modification strategy using rGO as a conductive support for CeO2 nanocrystals and introducing the transition metal Ni as the active dopant, resulting in the construction of the Ni–rGO/CeO2 electrocatalyst. It is found that rGO decoration prevents the aggregation of CeO2 NCs and increases the VO concentration in the CeO2 nanocrystals as well, while the introduced Ni leads to further formation of VO and serves as the active site for the HER reaction. Thus, the Ni–rGO/CeO2 electrocatalyst shows relatively low overpotential, a low Tafel slope, and great stability for HER, which is attributed to the synergistic effect of rGO decoration and Ni doping. This kind of facile strategy is promising for the design of noble-metal-free and low-cost electrocatalysts by the functional modification of CeO2-based nanocatalysts.
研究领域:
材料科学
·
电催化
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Yun Wu,Rui Yao,Kaiyang Zhang,Qiang Zhao,Jinping Li,Guang Liu
The use of proton exchange membrane (PEM) hydrolysis technology holds promise for eco-friendly hydrogen production using renewable energy sources. However, developing efficient, cost-effective, and durable bifunctional electrocatalysts for the acidic oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) remains challenging. Here, we synthesized RuO 2 /CeO 2 heterojunction loaded on carbon spheres (RuO 2 /CeO 2 @C) via hydrothermal and annealing techniques to address this issue. Our experiments demonstrate exceptional catalytic activity of RuO 2 /CeO 2 @C for both OER and HER, with overpotentials of 170 and 120 mV, respectively, at 10 mA/cm 2 in 0.5 M H 2 SO 4 . Moreover, the electrocatalyst enables overall water splitting at 1.54 V and maintains stability for over 100 h at 10 mA/cm 2 . Density functional theory (DFT) calculations suggest that RuO 2 /CeO 2 heterojunction modifies d-band center of Ru, balances H adsorption/desorption behavior, accelerates reaction kinetics, and lowers the energy barrier, thereby enhancing electrocatalytic activity. These findings provide valuable insights for future efficient bifunctional water splitting electrocatalyst design.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CATALYSIS COMMUNICATIONS
·
2019
·
IF 3.674
Bowen Lu,Fengjiao Quan,Zheng Sun,Falong Jia,Lizhi Zhang
Photothermal reverse-water-gas-shift is realized with high conversion rate and selectivity of CO in the case of Au/CeO 2 catalyst. Moreover, photothermal reaction rate is much higher (>10 times) than that performed under thermal condition. As indicated by the results of in-situ infrared spectroscopy and kinetic experiments, the special role of light is found to be related with the promotion of hydrogen-splitting step. The robust Au/CeO 2 catalyst exhibits stable activity and CO selectivity under long-term light irradiation. It is expected that the combination of catalysts and light may afford new perspectives for the CO 2 hydrogenation.
研究领域:
化学工程
·
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）