RSC Advances
·
2024
·Vol. 14
·期 21
·15039-15047
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IF 3.9
Zhixiang Deng,Zhixuan Wu,Xinkuan Liu,Zhengai Chen,Yan Sun,Ning Dai,Meiying Ge
The influence of ambient humidity on the gas-sensing characteristics of metal oxide semiconductors has been one of the greatest obstacles for gas-sensing applications. In this paper, the pure WO3 and CeO2-modified WO3 nanocubes were prepared by a simple hydrothermal method, and their gas-sensing characteristics in dry and humid atmospheres were investigated. The results show that CeO2/WO3 demonstrated excellent gas-sensing properties toward H2S with high sensitivity and high selectivity at 115 °C. Noteworthy, the humidity independence of the CeO2/WO3 increased compared to the WO3. The response retentions over the whole humidity range of the CeO2/WO3-6 and CeO2/WO3-15 sensors were 70.3, and 76%, respectively, which were much higher than the WO3 sensor (17.9%). The gas-sensing mechanism of CeO2-modified WO3 is discussed based on the gas sensitivity properties. The obtained results provide a promising route to enhance the anti-humidity properties of metal oxide semiconductor gas sensors.
研究领域:
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2017
·
IF 2.858
Xuehui Liu,Chuanjun Gu,Zhehua Wen,Baorong Hou
Water-based epoxy coating containing CeO 2 nanocontainers was successfully applied on carbon steel for corrosion protection. CeO 2 nanocontainers were loaded with the corrosion inhibitor benzotriazole (BTA). Polyelectrolyte multilayers were deposited on the loaded nanocontainers by layer-by-layer assembly method. Responsive release of BTA molecules were studied in water media at different pH values using UV–vis spectroscopy. The anticorrosive performance of the epoxy coatings doped with 0.5 wt% of smart nanocontainers was tested by immersion of the coated carbon steel in 0.5 M NaCl solution. Electrochemical impedance spectroscopy (EIS) was used to estimate the influence of smart nanocontainers on the passive corrosion resistance. The self-healing performance of the coating with modified CeO 2 nanocontainers was studied by scanning Kelvin probe (SKP). From results of EIS and SKP , the addition of pH-sensitive nanocontainers into the epoxy resin inhibited the corrosion activities on the metal surface, showing a promising strategy for developing water-based epoxy coatings with long term protection performance.
研究领域:
材料科学
·
腐蚀防护
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2013
·
IF 5.825
Qizhou Dai,Jiayu Wang,Jie Yu,Jun Chen,Jianmeng Chen
A magnetic core/shell CeO 2 nanometer catalyst particle of Fe 3 O 4 @SiO 2 @CeO 2 for ozonation was prepared and the catalytic activity was evaluated by the degradation of acetylsalicylic acid (ASA). The characterizations of the magnetic nanoparticles, such as TEM, XRD and EDX, showed that Fe 3 O 4 @SiO 2 @CeO 2 had a ternary structure with a Fe 3 O 4 magnetic core, a silica membrane mid-layer and CeO 2 outer layer. The catalysts of Fe 3 O 4 @SiO 2 @CeO 2 showed an obviously high efficiency in catalytic ozonation on the degradation of ASA, and thus could also enhance the TOC removal. The ASA removal with Fe 3 O 4 @SiO 2 @CeO 2 catalyst at 60 min could reach 81.0%, while 67.3% with Fe 3 O 4 @SiO 2 , 66.1% with Fe 3 O 4 and only 64.1% with ozonation alone. Fe 3 O 4 @SiO 2 @CeO 2 catalysts could also enhance the ozone utilization during the reaction. The effect of radical scavengers showed that the high removal efficiency of catalytic ozonation over Fe 3 O 4 @SiO 2 @CeO 2 may be mainly attributed to surface reactions. According to stability and recyclability test of the Fe 3 O 4 @SiO 2 @CeO 2 catalysts, the results showed that the catalysts would be helpful in the separation and magnetic recyclability. In addition, based on the intermediates detected by GC/MS, a possible degradation pathway of ASA was proposed.
研究领域:
环境科学
·
催化材料
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产品关联
DOI
高影响因子
SOLID STATE SCIENCES
·
2024
·
IF 3.4
Ke Yang,Sisi Cheng,Ziqin Yao,Shijia Li,Yuting Yang
Researchers in the field of electrochemistry have recently become interested in the extraordinary features of ternary transition metal oxide nanostructures with spinel structure derived from metal-organic framework (MOFs). In this study, the zeolitic imidazolate framework (ZIF-67), which grows in situ on the surface of another metal organic framework (Ce-BTC), was created using the internal expansion growth method (IEGM), and the resulting complex was then used as a template to create the dumbbell-like nanocomposite. Due to the strong electron conduction of CeO 2 in composites, the electrode modified with composite material has good electrochemical activity in alkaline solution. As a glucose sensor, Co 3 O 4 /CeO 2 nanocomposite modified glass carbon electrode (Co 3 O 4 /CeO 2 /GCE) has better performance with a detection range of 83.75 μM–2796.84 μM, a reasonably good sensitivity of 790.746 μA mM −1 ·cm −2 , an estimated detection limit of 5.5 μA (S/N = 3) and a short response time less than 3s. The modified electrode can continue to function normally even when exposed to various interfering compounds for extended periods of time in the air. The successful use of this enzyme-free glucose sensor in fruit juice demonstrates its remarkable performance and provides ideas for future applications.
研究领域:
电化学
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材料科学
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分析化学
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产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2016
·Vol. 18
·期 34
·6513-6519
·
IF 3.849
Yuhang Wu,Congyan Li,Kaiwen Zhou,Yanhong Zhao,Xiaojing Wang
A novel catalyst, CeO2@Ag/Ag2Ta4O11, was successfully assembled via an in situ catalytic process for 4-nitrophenol reduction. As-prepared samples were characterized using high-resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), X-ray spectroscopy (XPS), and ultraviolet-visible diffuse reflection spectroscopy (DRS). The results showed the elementary substance Ag was produced from Ag2Ta4O11 after a circular reduction reaction and was homogeneously deposited on the surface of Ag2Ta4O11 nanoparticles, which were wrapped by octahedron-shaped CeO2. The as-prepared nanocomposites exhibited extremely accelerated catalytic activity toward the efficient reduction of 4-nitrophenol compared to pure CeO2 and Ag2Ta4O11 nanoparticles. 15 rounds of recycling experiments confirmed that the samples exhibited good reuse stability, assigned to the confined robust shield of CeO2. The shell of CeO2 efficiently prevented undesirable aggregation and leaching of Ag nanoparticles. The persistent ascending activity with an increasing number of experimental runs was related to the amount of metallic Ag gradually growing. Moreover, it was proposed that the active interfacial contact between ceria oxide/metallic Ag/the semiconductor Ag2Ta4O11 (CeO2@Ag/Ag2Ta4O11) in the core–shell structure facilitated the transfer of electrons, contributing to the enhanced activity.
研究领域:
材料科学
·
环境化学
✓ 已验证
DOI
高影响因子
ENERGY & FUELS
·
2015
·
IF 2.79
Yane Zheng,Kongzhai Li,Hua Wang,Xing Zhu,Yonggang Wei,Min Zheng,Yuhao Wang
Chemical-looping reforming of methane (CLRM) offers a potentially effective approach for the coproduction of syngas and pure hydrogen. Macroporous CeO2–ZrO2 solid solutions with different pore sizes were prepared as oxygen carriers for the CLRM system. The physical and chemical properties of the oxygen carriers were characterized by the techniques of scanning electron microscopy (SEM), mercury intrusion porosimetry (MIP), X-ray powder diffraction (XRD), N2 adsorption–desorption, Raman spectra, transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), temperature-programmed reduction (TPR), and temperature-programmed oxidation (TPO). The relationship among the structural features, the concentration of oxygen defect, and the oxygen mobility of the macroporous CeO2–ZrO2 solid solutions and the nonporous sample were also discussed. It is found that the specific surface area and oxygen mobility of such oxides are closed correlated to their performance for the CLRM process. Compared with the nonporous sample, the macroporous CeO2–ZrO2 solid solutions own lower specific surface area and better oxygen mobility due to the relatively high concentration of the oxygen vacancy. This allows such oxides to own both high conversion and selectivity for the oxidation of methane to syngas using a chemical-looping concept. The presence of the macroporous structure also improves the reoxidation rate and hydrogen yield (the hydrogen yield increased by 50%) in the water splitting step. This can be attributed to the abundant channels in the materials, which may improve the dynamic conditions of the gas–solid reactions, resulting in relatively high utilization rate of oxygen carriers. The pore size also affects the activity of the macroporous oxygen carriers. The increase of the pore size slightly reduces the reactivity of the oxygen carrier due to partial collapse of the macroporous structure. The macroporous Ce–Zr-100 oxygen carrier with a pore size of 100 nm exhibits excellent activity and stability in the coproduction of pure hydrogen and high-quality syngas, even after 40 times successive redox cycles.
研究领域:
能源材料学
·
催化化学
✓ 已验证
DOI
高影响因子
Catalysis Science & Technology
·
2021
·Vol. 11
·期 9
·3241-3250
·
IF 6.119
Ming Jiang,Xiaopeng Chen,Linlin Wang,Jiezhen Liang,Xiaojie Wei
Selective hydrogenolysis of aryl ethers to produce aromatic compounds is a key strategy for lignin valorization. The use of non-noble-metal catalysts to realize the cleavage of C–O ether bonds under mild conditions has been of considerable research interest recently. We herein report the synthesis of a nitrogen-doped porous-carbon-skeleton-supported Ni–CeO2 catalyst (Ni–CeO2/CN). The synergistic effect between Ni and CeO2 species led to the Ni–CeO2/CN catalyst having a high activity and selectivity for the cleavage of C–O ether bonds at a low reaction temperature. In particular, the Ni–CeO2/CN catalyst showed excellent effectiveness in the hydrogenolysis of benzyl phenyl ether (α-O-4 bonds), and the full conversion was achieved after 2 h at a temperature of 60 °C, with phenol and toluene as the sole reaction products. In addition, the conversion of more robust β-O-4 ether bonds in 2-phenoxy-1-phenylethanol reached up to 100% with the yield of ethylbenzene and phenol at 150 °C for 2.5 h being 60.2% and 68.3%, respectively. The reusability-experiment results indicate that Ni–CeO2/CN maintained a high catalytic activity in five reaction runs, making this a promising route for C–O ether bond cleavage under mild conditions.
研究领域:
催化化学
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生物质转化
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材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2024
·
IF 5.2
Jun Cai,Hua Wang,Hui Li,Kongzhai Li
Solar energy can be used to convert CO 2 into valuable chemical compounds. However, the low activity of photocatalysts has hindered their development. By using defective g-C 3 N 4 /CeO 2 heterojunctions, CO 2 was successfully photo-reduced with high performance under ambient water vapor conditions without adding additives. g-C 3 N 4 in this system has a significant impact on CO 2 conversion efficiency, with 5 wt% g-C 3 N 4 /CeO 2 exhibiting competitive performance, achieving 45.66 μmol/g CO in 6 h with nearly 100% selectivity. Photoactivity is attributed to the formation of g-C 3 N 4 /CeO 2 heterojunctions, which provide excellent electron transport and electron-hole separation. Additionally, light enhances the CO 2 adsorption capacity of the catalyst, thereby improving reaction properties. The photogenerated electrons generated under light excitation can quickly gather at the surface and defective parts of the sample, facilitating effective CO 2 adsorption and promoting the formation of *COOH, thus promoting the photoreduction process of CO 2 . Cycle tests also demonstrate long-term stability. Highly efficient charge separation and reduced free energy of CO 2 reduction both promote CO 2 conversion performance. This work can provide an important idea for designing CeO 2 -based CO 2 photocatalysts.
研究领域:
材料科学
·
环境科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
CATALYSIS LETTERS
·
2025
·Vol. 155
·期 5
·1-19
·
IF 2.4
Hu Xinyin,Xiao Guoqing,Chen Chunlin,Chen Chunyan,Zeng Xiang,Li Ruili,Yang Zhengwei
Recently, several emerging pollutants have caused increasing damage to aquatic ecosystems. Reducing antibiotic concentrations in water by visible light is one of the most promising strategies for sustainable development. Here, a Bi 2 S 3 /CeO 2 /Ni(OH) 2 Z-scheme heterojunction photocatalyst was prepared by the hydrothermal method, which could effectively utilize free radicals to degrade tetracycline. Ni(OH) 2 was used for co-catalysing in photodegradation experiments to improve electron transfer and enhance photocatalytic performance. The degradation rate of the Z-scheme heterojunction photocatalyst for 20 mg/L TC was 91.35% after reacting 60 min under visible light irradiation. Besides, it also investigated such operational parameters influencing the photocatalytic reaction as catalyst dosage, initial concentration of tetracycline hydrochloride (TC), and solution pH. Studies using free radical scavenging experiments and electron spin resonance (ESR) measurements demonstrated that hydroxyl radicals (·OH) and superoxide radicals (·O 2 − ) both contributed to the photodegradation of TC. Finally, with high-performance liquid chromatography-mass spectrometry (LC-MS), potential degradation pathways of the intermediate products were logically inferred as well as the photocatalytic mechanism. The experimental results surface that the prepared Z-scheme heterojunction photocatalyst Bi 2 S 3 /CeO 2 /Ni(OH) 2 exhibits superior photocatalytic performance, offering a novel approach to addressing TC contamination in environmental settings. Graphical
研究领域:
环境科学
·
材料科学
·
光催化技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2019
·
IF 5.108
Misganaw Alemu Zeleke,Dong-Hau Kuo
Methylene blue dye is among the toxic, mutagenic, and carcinogenic pollutants. Hence, its treatment via photocatalytic degradation is an important remediation method for the sake of a healthy environment. Herein, the V 2 O 5 -CeO 2 nanocomposite catalysts were synthesized via a simple precipitation-thermal decomposition approach and used for the photodegradation of methylene blue in the presence of H 2 O 2 as an effective electron scavenger under visible light illumination. The nanocomposite catalysts were systematically characterized to investigate the effects of V 2 O 5 with the aids of X-ray, morphology, light absorption , catalytic activity , and charge transfer properties of the nanocomposite catalysts. The VC-2 nanocomposite prepared with NH 4 VO 3 :CeO 2 molar ratios at 0.15:1 was found to be the best efficient catalyst where ≥98% of methylene blue was degraded within 25 min irradiation time. From the kinetics analysis, its rate constant was found to be higher than those of the pure V 2 O 5 and CeO 2 catalysts by a factor of 12.0 and 13.5, respectively. The plausibly mechanistic elucidation of charge transfer and utilization of reactive species are conspicuous allegations of the combined effects of the nanocomposite catalyst, H 2 O 2 sacrificial agent, and visible light for the photodegradation of the dye.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Yao He,Aiqin Liang,Danhua Zhu,Meihua Hu,Liming Xu,Shixing Chao,Weiqiang Zhou,Yanli Wu,Jingkun Xu,Feng Zhao
Although WO 3 with high theoretical capacitance has a future in the field of energy storage, its electrode processing to obtain high capacitance is still a challenge. Here, we propose an innovative electrode structure design by utilizing PEDOT and PEDOT:PSS to sequentially assemble with the oxygen vacancies-enriched WO 3 and WO 3 -CeO 2 hybrid nanowires on the glassy carbon (GC). As-prepared PEDOT:PSS/WO 3 /PEDOT/GC and PEDOT:PSS/WO 3 -CeO 2 /PEDOT/GC electrodes show high areal capacitance of 1139.6 and 1310 mF cm −2 at 2 mA cm −2 , respectively, greater than 822.3 mF cm −2 of the WO 3 -PTFE-C/GC. The asymmetric supercapacitor based on PEDOT:PSS/WO 3 -CeO 2 /PEDOT and PEDOT:PSS/RuO 2 /PEDOT electrodes works at 1.6 V high working voltage, delivers an energy density of 0.61 Wh m −2 at power density of 8.22 W m −2 . Therefore, the electrode structure design will be suitable to improve the capacitance performance of other low-conductivity active materials.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Bowen Lu,Tai Zhang,Liqi Zhang,Yongqing Xu,Zewu Zhang,Fan Wu,Xiaoshan Li,Cong Luo
CeO 2 -based catalysts have been widely used in the CO 2 hydrogenation process. The oxygen vacancies on CeO 2 resulted from Na ion incorporation play a vital role in CO 2 conversion activity, the effect of Na + ion-doped in CeO 2 during CO 2 hydrogenation was rarely studied. In this work, the LN-CeO 2 catalysts with different n NaOH :n Ce ratios were prepared with liquid nitrogen(Liquid Nitrogen-CeO 2 , LN-CeO 2 ), and the effect of the n NaOH :n Ce ratio on the microstructure of the LN-CeO 2 catalysts were evaluated. The best CO 2 hydrogenation performance was achieved by LN-CeO 2 -100 with a CO production rate of 3.90 mol/g cat· h at 800 °C (100% CO selectivity). The kinetic results indicated that the CO 2 hydrogenation performance difference among these LN-CeO 2 catalysts resulted from the CO 2 activation process. Oxygen vacancies could enhance CO 2 activation on the surface of LN-CeO 2 , and oxygen vacancies displayed a linear correlation relationship with the Na content doped in LN-CeO 2 . The highest concentration of oxygen vacancies resulted from Na ion incorporated and lower CO 2 reaction order was closely related to CO 2 hydrogenation performance of LN-CeO 2 -100. These results will give insight into the Na effect on the CO 2 hydrogenation mechanism over CeO 2 .
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）