JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2019
·
IF 3.218
Xiaolong Tu,Yu Xie,Xue Ma,Feng Gao,Lei Gong,Dingwen Wang,Limin Lu,Guangbin Liu,Yongfang Yu,Xigen Huang
Metal–organic frameworks (MOFs) as porous materials have been widely used in electrochemical sensing field. Unfortunately, their low electrical conductivity and poor stability in the aqueous solution limit their application. To overcome these shortcomings, in this study, a novel reduced graphene oxide-encapsulated Ce-MOF (RGO@Ce-MOF) composite was synthesized by using a simple and green method. Ce-MOF and GO were firstly casted onto glassy carbon electrode, respectively, and then GO was reduced to RGO through electrochemical reduction strategy. The proposed encapsulated structure of RGO@Ce-MOF effectively improved the stability of Ce-MOF by preventing decomposition of MOF in solution. The combination of RGO and Ce-MOF can also significantly promote the conductivity of composite. Then, the obtained RGO@Ce-MOF composite was utilized as electrode material for the detection of dichlorophen (Dcp), a halogenated phenolic intermediate for synthesis of pesticide. The electrochemical properties of the proposed sensor were investigated by electrochemical techniques in detail. Benefiting from the synergy between Ce-MOF and RGO, the RGO@Ce-MOF can be used to detect Dcp with a wide linear range from 0.02 μM to 10 μM and a low detection limit of 0.007 μM (S/N = 3). Furthermore, the RGO@Ce-MOF electrode showed acceptable reproducibility and good selectivity. This method was applied to detect Dcp in the real samples with satisfying results.
研究领域:
材料科学
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环境科学
·
分析化学
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DOI
高影响因子
iScience
·
2022
·
IF 6.107
Meng Wang,Yan Zhang,Wenpo Shan,Yunbo Yu,Jingjing Liu,Hong He
The thermal stability of the catalysts is of particular importance but still a big challenge for working under harsh conditions at high temperature. In this study, we report a strategy to improve the thermal stability of the ceria-based catalyst via introducing Sn. XRD, Rietveld refinement, and other characterizations results indicated that the formation of Sn-Co solid solution plays a key role in the thermal stability of the catalyst. The developed ternary 3%Co/Ce 0.5 Sn 0.5 O 2 catalyst not only exhibits outstanding thermal stability and resistance to SO 2 and H 2 O for soot oxidation from diesel vehicle exhaust but also remains extraordinary thermal stability for CO oxidation. Remarkably, even after thermal aging at 1000°C, it still possessed high catalytic activity similar to that of the fresh catalyst.
研究领域:
催化材料
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环境科学
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
CHROMATOGRAPHIA
·
2014
·Vol. 78
·期 1
·119-123
·
IF 1.37
Yang Xiujuan,Liu Cui,Chen Zuanguang
A novel and rapid method was developed for the determination of uric acid in human urine by capillary electrophoresis with an improved electromagnetic induction detector. Electrophoretic parameters affecting the separation efficiency, such as buffer composition, buffer pH, buffer concentration, and electroosmotic flow modifier, were systematically investigated. An electrolyte solution consisting of 8.5 mmol L −1 tris(hydroxymethyl)aminomethane (Tris), 1.5 mmol L −1 citric acid, and 0.2 mmol L −1 cetyltrimethylammonium bromide, pH 8.0, was found to be suitable for sample determination. Uric acid was separated and detected within 2.3 min, with a linear response range from 5 to 400 µg mL −1 and a correlation coefficient of 0.9998. Intraday and interday precision were 1.6 and 2.5 % ( n = 6), respectively. The recoveries were between 98.3 and 100.5 %. This simple, effective, and stable method is a good alternative to existing methods for uric acid determination. Also, the improved electromagnetic induction detector holds great promise in clinical analysis.
研究领域:
分析化学
·
临床分析
·
电泳技术
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DOI
高影响因子
FUEL
·
2018
·
IF 4.908
Bo Jiang,Lin Li,Zhoufeng Bian,Ziwei Li,Mazen Othman,Zhehao Sun,Dawei Tang,Sibudjing Kawi,Binlin Dou
This paper describes the synthesis of a series of x CeNi-PSNT (phyllosilicate nanotube) oxygen carriers (OCs) and presents the effect of Ce loading on the performance in chemical looping reforming (CLR) of glycerol. Various characterization techniques including N 2 adsorption-desorption, X-ray diffraction (XRD), transmission electron microscopy (TEM), H 2 temperature-programmed reduction (TPR), X-ray photoelectron spectra (XPS) and O 2 volumetric chemisorption were employed to investigate the physicochemical properties of the fresh and used OCs. The characterization results demonstrated that the PSNT structure possessed strong confinement effect and that the Ce promotion improved Ni dispersion and the reducibility of NiO particle and isolated Ni ions. The enhanced reducibility significantly shortened the dead time in the fuel feed step, resulting in the high H 2 generation efficiency. The reactivity and stability tests were conducted in a fixed-bed reactor. A Ce/Ni mass ratio of 0.5 was optimized for CLR with an average H 2 yield of 12.5 wt%, an average NiO conversion of 67%, and an accumulated coke deposition of 3.8 wt% in a 10-cycle stability test. The confinement effect of PSNT and Ce promotion both have positive effects on attaining the excellent performance.
研究领域:
材料科学
·
能源工程
·
催化化学
✓ 已验证
DOI
高影响因子
Catalysts
·
2016
·Vol. 6
·期 8
·112
·
IF 2.964
Xiaobo Wang,Lei Zhang,Shiguo Wu,Weixin Zou,Shuohan Yu,Ye Shao,Lin Dong
A series of Fe–Ce–Ti catalysts were prepared via co-precipitation method to investigate the effect of doping Ce into Fe–Ti catalysts for selective catalytic reduction of NO with NH3. The NO conversion over Fe–Ce–Ti catalysts was considerably improved after Ce doping compared to that of Fe–Ti catalysts. The Fe(0.2)–Ce(0.4)–Ti catalysts exhibited superior catalytic activity to that of Fe(0.2)–Ti catalysts. The obtained catalysts were characterized by N2adsorption (BET), X-ray diffraction (XRD), temperature programmed reduction (H2-TPR), temperature programmed desorption (NH3-TPD), Fourier transform infrared (FT-IR) spectrophotometry, thermogravimetric analysis (TGA), and X-ray photoelectron spectroscopy (XPS). The data showed that the introduction of Ce results in higher surface area and better dispersion of active components on the catalyst surface and enhances the amount of surface acid sites. The interactions between Fe and Ce species were found to improve the redox ability of the catalyst, which promotes catalytic performance at low temperature. The XPS results revealed that Fe3+/Fe2+and Ce4+/Ce3+coexisted on the catalyst surface and that Ti was in 4+ oxidation state on catalyst surface. Ce doping increased the atomic ratio of Fe/Ti and Ce/Ti and enhanced the surface adsorbed oxygen species. In addition, Fe(0.2)–Ce(0.4)–Ti catalyst also showed better tolerance to H2O and SO2and up to 92% NO conversion at 270 °C with 200 ppm SO2added over 25 h, which suggests that it is a promising industrial catalyst for mid-low temperature NH3–selective catalytic reduction (SCR) reaction.Keywords:SCR;denitration;catalytic activity;synergistic effect;SO2resistance
研究领域:
环境科学
·
催化化学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2026
·
IF 5.4
Lei Zhang,Tian Ai,Nan Zhang,Bo Peng,Ya Gao,Quanying Ma
To efficiently and economically remove phosphates from wastewater, this study employed a microwave–assisted hydrothermal method to successfully synthesise a bimetallic Ni/Ce organic framework composite supported on biochar. Compared to other adsorbents, this composite exhibits smaller particle size, more uniform morphology and greater defect density. Its unique structure facilitates electron transfer between the metals and the support while increasing the number of oxygen vacancies, thereby significantly enhancing adsorption performance. Adsorption experiments demonstrate that NiCe–BC–MOFs achieves adsorption equilibrium within 80 min, with a maximum adsorption capacity of 266.67 mg P/g – far exceeding most reported values in the literature. The material exhibits excellent adaptability and stability across a broad pH range (2 – 10), in the presence of multiple coexisting anions, and within diverse aquatic matrices. Its high efficiency was further validated in real phosphorus–containing wastewater. Its adsorption mechanism involves the synergistic action of hydrogen bonding, ligand exchange, ion exchange, and electrostatic attraction. Furthermore, the incorporation of biochar effectively reduces material costs, and after five cycles, the adsorption capacity remains above 82%, demonstrating good regenerability. Consequently, NiCe–BC–MOFs represent a phosphate adsorption material that combines high efficiency, low cost, and environmental friendliness, offering broad application prospects.
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产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2026
·
IF 19.7
Pengchao Ren,Xin Fu,Shihang Meng,Yehao Yu,Yujing Weng,Liang Si,Yulong Zhang,Yi-Fan Han
Ce-modified CuZn-based catalysts show promising performance in CO 2 hydrogenation to methanol. However, probing the nature of their active surface and elucidating the role of Ce in regulating reaction pathways at the molecular level remain challenging. In this study, a series of CuZnCe catalysts were prepared with varying CeO 2 contents. Kinetic tests reveal that CuZnCe catalysts exhibit significantly higher activity and methanol selectivity compared to the unmodified CuZn catalyst. In-situ AP-XPS analysis demonstrates that Ce species preferentially migrate toward the catalyst surface and exist predominantly in the form of Ce 3 + during CO 2 hydrogenation to methanol. In-situ DRIFTS confirms that the CuZn catalyst facilitates the direct hydrogenation of CO 2 to methanol via a formate intermediate. In contrast, the introduction of Ce shifts the reaction mechanism toward the reverse water-gas shift reaction followed by CO-hydrogenation (RWGS + CO-hydro), as Ce 3+ sites display a high propensity to stabilize carboxylate (CO 2 δ- ) intermediates derived from CO 2 . Meanwhile, the Cu-ZnO x interface remains essential for H 2 dissociation and supplying hydrogen species. The enhanced catalytic performance of the CuZnCe catalysts is primarily attributed to the synergistic effects between the Cu-ZnO x and Cu-CeO x interfaces. These findings highlight the pivotal role of metal-oxide interfaces in controlling reaction pathways and methanol selectivity during CO 2 hydrogenation to methanol, providing valuable insights for the rational design of high-performance catalysts.
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DOI
高影响因子
Materials Today Chemistry
·
2026
·
IF 6.7
Sara Adeeba Ismail,Wenqi Lei,Lulu Jiang,Donglin Han
Ba 7 Nb 4 MoO 20 is a pure oxide ion conductor in both dry and wet oxygen atmospheres at the operating temperature of solid oxide fuel cells and has the promising potential to be applied as electrolyte materials. In this work, donor-doping trivalent rare earth elements R ( R = Y, Ce, Nd, Ho, Er and Yb) to replace the divalent Ba cations increases oxygen content slightly, but effectively enhances oxide ion conduction. Although the solubility of these dopants is less than x = 0.02 in Ba 7- x M x Nb 4 MoO 20+0.5 x , the Ba 6.98 Er 0.02 Nb 4 MoO 20.01 composition exhibits the highest conductivity, reaching 0.0066 and 0.0085 S cm −1 at 700 and 800 °C, respectively, nearly 6 times higher than that of pristine Ba 7 Nb 4 MoO 20 . H 2 O/D 2 O isotope effect measurement verifies that these materials are essentially pure oxide conductors even in wet atmospheres. It is hard to believe that the trace-level dopant concentration can influence the conduction behavior effectively. However, the slight change in the oxygen content, particularly in the BaO 2 conduction plane, is possible to influence the conductivities. The oxygen occupancy in the O1 and O5 sites thereby seems to be highly sensitive to and dependent on the occupancy of the dopants over the Ba and Nb/Mo sites.
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产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2017
·
IF 3.454
Shuilin Chen,Benxue Jiang,Qinghua Yang,Yiguang Jiang,Pande Zhang,Qijun Gan,Ge Zhang,Jintai Fan,Xiaojian Mao,Long Zhang
A Ce-doped (Gd 2 Y)(Ga 3 Al 2 )O 12 ceramic with good performance was fabricated by sintering in an oxygen atmosphere and hot isostatic pressing . The microstructure as well as the optical and scintillation characteristics of the ceramic was investigated. The ceramic exhibited a high transmittance of 78% in the range of 500–800 nm. The radioluminescence intensity of the ceramic reached up to 30 times that of a bismuth germinate single crystal , and the light yield within 750 ns shaping time was approximately 25800 photons/MeV under 137 Cs γ-ray irradiation.
研究领域:
材料科学
·
陶瓷
·
光学材料
·
核探测
·
固态物理
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DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2024
·
IF 5.3
Jiaping Guan,Guomin Sun,Gaoyuan Yu,Yu Chen,Jiawen Wei,Xiaohui Zhu,Xiaogu Huang
Sodium-ion batteries (SIBs) have garnered significant interest due to their cost-effectiveness and operational similarities to lithium-ion batteries. Amongst the various components, the cathode plays a pivotal role in determining the energy density of these batteries. Mn-based layered oxides stand out as promising cathode materials, owing to their abundance and non-toxicity. However, these oxides tend to suffer from structural instability during high-voltage cycling, leading to a decline in capacity. In this work, we have designed Ce-doped Na 0.6 Li 0.2 Mn 0.79 Ce 0.01 O 2 cathodes through a solid-state reaction process. This innovation aims to inhibit undesirable phase transitions and enhance the electrochemical performance of the electrodes. By integrating electrochemical testing with a suite of characterization techniques, we have shown that 1 mol% Ce doping effectively suppresses the formation of birnessite and the irreversible oxygen redox reactions in the high-voltage region. Moreover, our findings indicate that the detrimental phase transitions can be significantly mitigated throughout the electrochemical cycling process, thereby bolstering structural stability. Notably, the capacity of the Ce-doping cathode after 20 cycles substantially exceeds its initial discharge specific capacity, reaching 169.3 mAh g –1 . This research introduces a strategy for stabilizing the cathode structure of P2-type Mn-based layered oxides through Ce-doping, offering valuable insights for the advancement of next-generation SIBs.
研究领域:
材料科学
·
电化学
·
能源存储
·
无机化学
·
固态化学
✓ 已验证
DOI
高影响因子
JOURNAL OF NON-CRYSTALLINE SOLIDS
·
2024
·
IF 3.2
Qi Zhang,Guoyu Zhao,Qingxian Zhao,Xian Wei,Wei Wei
Ultrathin and transparent scintillator films for X-ray microscopic imaging are urgently desired to accurately detect the internal tiny structure of objects in nondestructive way. However, it is great difficulty for the commercial scintillators (e.g., CsI:TI, LYSO:Ce) to obtain the ultrathin single crystal scintillators below 50μm. Additionally, scintillator powders such as Gd 2 O 2 S:Tb, when embedded in polymeric matrix, demonstrate significant scattering resulting from their opacity and substantial thickness. Here, we present a novel ultrathin (∼46μm) and transparent (∼90%) LaF 3 :Tb,Ce-polyvinyl alcohol (PVA) composite scintillator film with ultra-high loading content (∼85wt%) for high resolution X-ray microscopic imaging. It is obtained by thoroughly mixing directly precipitated LaF 3 :Tb,Ce nanocrystals (∼13nm) prepared by direct precipitation and PVA solution, followed by scraping and drying. The harmless solvent and low preparation temperature (below 100℃) contribute to its convenient and eco-friendly nature. More importantly, the film realizes high spatial resolution of 7μm thanks to its ultrathin and transparent feature.
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Tingliang Xie,Minxuan Chen,Cong Xu,Jing Chen
Microextractors are known to provide high mass transfer rates for the extraction and separation of rare-earth elements (REEs). High-throughput microextractors are essential for industrial-scale production of REEs, but few practical studies have been conducted to date. In this work, a chaotic advection microextractor, i.e., a three-stage microextractor, was designed and demonstrated to extract Pr(III) and Ce(III) efficiently from nitric acid media at high throughputs by using 2-ethylhexyl phosphoric acid-2-ethylhexyl ester (P507) and sulfonated kerosene as an extraction agent and a diluent, respectively. Flow visualization experiments showed that the dispersed phase could be effectively broken into small droplets owing to vortex and recirculation flows. Microextraction experiments performed under optimal extraction conditions indicated that at low throughputs, the concentration ratio D , extraction efficiency E , and separation factor β decreased with an increase in the throughput, whereas at high throughputs, D , E , and β increased with an increase in the throughput. An extraction efficiency close to that of co-current balanced extraction was successfully achieved, even at a high total throughput of 100 mL/min and a rather short residence time of 0.029 s. Thus, the chaotic advection microextractor features a high throughput and high extraction efficiency, which are appropriate for the high-efficiency extraction and separation of REEs.
研究领域:
化学工程
·
分离科学
·
稀土冶金
·
微流控技术
·
过程强化
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）