Analytical Methods
·
2021
·Vol. 13
·期 14
·1672-1680
·
IF 2.896
Yalin Wu,Liping Lu,Zhihui Yu,Xiayan Wang
Based on the strategy of increasing the number of oxygen vacancies to improve the catalytic performance, we have developed a novel electrochemical sensor based on the multivalent metal oxides cerium dioxide and manganous oxide (Mn3O4/CeO2) for reliable determination of extracellular hydrogen peroxide (H2O2) released from living cells. The Mn3O4/CeO2 nanocomposite was characterized by high-resolution transmission electron microscopy, energy-dispersive X-ray spectroscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. The electrochemical performance of the Mn3O4/CeO2 nanocomposite modified glassy carbon electrode (Mn3O4/CeO2/GCE) was investigated. Owing to the abundant oxygen vacancies and strong synergistic effect between the multivalent Ce and Mn, the sensor exhibited excellent catalytic activity and selectivity for the electrochemical detection of H2O2 with a low quantitation limit of 2 nM. Moreover, Mn3O4/CeO2/GCE exhibited excellent reproducibility, repeatability, and long-term storage stability. Because of these remarkable analytical advantages, the constructed sensor was able to determine H2O2 released from living cells with satisfactory results. The results showed that the Mn3O4/CeO2 sensor is a promising candidate for a nanoenzymatic H2O2 sensor with the possibility of applications in physiology and diagnosis.
研究领域:
生物医学工程
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
BIOSENSORS & BIOELECTRONICS
·
2022
·
IF 12.545
Zhenxing Wang,Hongli Zhao,Kaicha Chen,Fangfang Zhou,Shlomo Magdassi,Minbo Lan
Two-dimensional (2D) porous carbon-based composite nanosheets loaded with metal oxide nanoclusters are expected to be promising electrocatalysts for high-performance electrochemical sensors . However, for this complicated composite material, strict reaction conditions and complex synthesis steps limit its general application in electrochemical detection . Here we present a facile method to fabricate 2D mesoporous nitrogen-rich carbon nanosheets loaded with CeO 2 nanoclusters (2D-mNC@CeO 2 ), for fabricating superoxide anions (O 2 •− ) electrochemical sensor. The method is based on block copolymers self-assembly and the affinity of polydopamine to metal ions to obtain organic-inorganic hybrid, which can be directly converted into 2D-mNC@CeO 2 through carbonization strategy without structural deterioration . Characterizations demonstrate that the 2D-mNC@CeO 2 owned the 2D N-doped carbon structure with an interlinked hierarchical mesoporous and the uniformly dispersed CeO 2 nanoclusters on the surface. Benefitted from the unique structure, the 2D-mNC@CeO 2 shortens electron transfer distance, enhances mass transfer efficiency, exposes numerous active sites, and obtain a high Ce 3+ /Ce 4+ ratio for improving electrocatalytic performance. The 2D-mNC@CeO 2 /SPCEs sensors for O 2 •− detection has a detection limit of 0.179 μM (S/N = 3) and sensitivity of 401.4 μA cm -2 mM -1 . The sensors can be applied to capture electrochemical signals of O 2 •− released from HepG2 cells, demonstrating the application potential of the sensors to monitor O 2 •− in biological fields.
研究领域:
材料科学
·
生物医学工程
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Jiabing Chen,Xiaowei Zhu,Mengheng Wang,Xingmao Jiang,Xiaojun Lu
The reaction rate of alkoxycarbonylation is typically lower when using heterogeneous catalysts compared to homogeneous catalysis, primarily due to the reduced ability of the active sites to activate the reactants. To address the insufficient activation of reactants on the Ru/CeO 2 catalyst for ethylene methoxycarbonylation, this study investigates the doping of CeO 2 with Pr 3+ ions. By substituting Ce 4+ with Pr 3+ in the CeO 2 , richer oxygen vacancies are generated, which enhance the activation of CH 3 OH. This doping significantly increases the reaction rate of ethylene methoxycarbonylation to methyl propionate (MP), achieving a rate of 86.1 g·g Ru -1 ·h −1 while maintaining a selectivity of over 99 %. Notably, Pr doping also induces the formation of Ru-O-Ce species in the catalyst, which hinders the reduction of Ru species. However, this hindered reduction is counterbalanced by the enhanced dispersion of Ru species, as Pr doping promotes the formation of smaller Ru nanoparticles. Thus, an optimal level of Pr doping exerts a synergistic effect by positively influencing both the CeO 2 support and the Ru metal, thereby improving their respective abilities to activate the reactants and enhancing the overall performance in the ethylene methoxycarbonylation reaction to produce MP.
研究领域:
催化
·
材料科学
·
化学反应工程
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
ChemNanoMat
·
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
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生物医学工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Energy Storage Materials
·
2021
·
IF 17.789
Qinghua Deng,Yong Yang,Siyu Qu,Wenjie Wang,Yinkai Zhang,Xinyan Ma,Wuwei Yan,Yiwei Zhang
Li-CO 2 batteries present considerable prospects both in resourcing CO 2 and remedying the unsatisfied performance of current energy storage devices. Herein, a porous self-supporting cathode for Li-CO 2 battery is fabricated through straightforward anchoring of two-dimensional (2D) cobalt-doped CeO 2 nanosheets on graphene aerogel , bypassing the addition of binder and the complicated manufacturing process. The combination of CeO 2 and Co 3 O 4 results in the reorganization of electronic structure by strongly coupled nanointerfaces, enhancing the reversible formation and decomposition of Li 2 CO 3 . Meanwhile, the unique porous structure facilitates the diffusion of CO 2 and electrolyte in Li-CO 2 batteries. The as-assembled Li-CO 2 battery achieves a superior discharge capacity (7860 mAh/g) and competitive cycling stability (>100 cycles). In particular, a flexible Li-CO 2 battery is developed with the freestanding cathode, which can provide a stable power output during multi-angle bending and folding. The improved conductivity, CO 2 adsorption ability and the electrochemical reaction pathway are revealed by density functional theory (DFT) calculations in detail. This work sheds new light on the development of advanced and flexible Li-CO 2 batteries for wearable electronics.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2019
·
IF 6.361
Dandan Ma,Diankun Sun,Yajun Zou,Siman Mao,Yixuan Lv,Yao Wang,Jun Li,Jian-Wen Shi
A series of dandelion-like Fe-CeO 2 /CdS (FeCe x /Cd y ) nanoflowers with different molar ratios of Fe-CeO 2 to CdS are synthesized by solvothermal method for the first time. The FeCe x /Cd y nanoflowers are assembled by a large number of nanoparticles with the diameter of about 3 nm, and the introduction of Fe ions and the couple of CdS quantum dots (QDs) efficiently enhanced the relative percentage of Ce 3+ in CeO 2 . The as-obtained FeCe 1 /Cd 1 heterostructure exhibits the highest photocatalytic H 2 evolution ability of 108.9 μmol/h, which is 20.5, 6.1 and 7.1 times higher than CeO 2 , Fe-CeO 2 and CdS, respectively. This significantly enhanced photocatalytic performance can be mainly attributed to the synergy between the electronic anchoring effect of Fe 3+ /Fe 2+ and Ce 4+ /Ce 3+ redox couples and the internal electric field constructed by the II-type heterojunction between Fe-CeO 2 and CdS. This work provides a new idea for the design of efficient photocatalysts by combining the advantages of heterostructure and ion anchoring effect.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Haiming Gu,Xuxing Shen,Minyu Yu,Miaomiao Niu,Shanhui Zhao,Siwen Zhang,Xiaolong Bi,Yadong Yu,Mofei Zhong,Lianggan Guan
Sorbent looping dry reforming of methane (SLDRM) represents a promising approach for CO 2 emission reduction and resource utilization, with its advancement hinging on the development of dual functional materials (DFMs) capable of simultaneous CO 2 capture and catalytic methane conversion. In this study, CaO-Ni based DFMs supported on various materials were synthesized via sol–gel method and characterized using SEM, XRD and TGA. Isothermal SLDRM experiments were performed in a fixed bed to evaluate the performance of these materials. Initial screening of support materials revealed that CH 4 conversion activity followed the order: CeO 2 >Al 2 O 3 >La 2 O 3 >MgO ≈ Y 2 O 3 , with CeO 2 emerging as the optimal support due to its superior performance. The synergistic effect of the Ni catalyst and CH 4 atmosphere significantly enhanced low-temperature decarbonization of the sorbent, mitigating sintering and enhancing cyclic CO 2 capture capacity. In-situ CO 2 conversion during CH 4 reforming disrupted the decarbonization reaction equilibrium, enabling efficient isothermal CO 2 capture and decarbonation. Ni decoration significantly enhanced CH 4 conversion, increasing from nearly 0% without Ni to 87% at 10% Ni loading, while higher loadings provided only marginal improvements. Although an increase in reaction temperature enhanced CH 4 conversion, it also increased CO 2 partial pressure, promoting the reverse water gas shift reaction and resulting in a H 2 /CO ratio below 1 when the temperature exceeded 650°C. Stability tests over 10 consecutive SLDRM cycles demonstrated good stability of CaO-10Ni/CeO 2 , maintaining a CH 4 conversion efficiency of 87% and a stable H 2 /CO ratio of approximately 1 at 650°C. Carbon deposition during the CH 4 step was effectively removed during carbonation, as confirmed by Raman spectroscopy, while SEM and XRD analyses revealed preserved surface morphology and phase composition. These findings highlight the excellent reactivity and stability of CaO-10Ni/CeO 2 , positioning it as a highly promising candidate for advancing CO 2 emission reduction and resource utilization strategies.
研究领域:
化学工程
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Shiju Yang,Xueshuang Yan,Fuzhi He,Zhuliang Chen,Kaizhu Chang,Wan Yang,Futing Xia,Jianjun Chen,Qiulin Zhang
Achieving remarkable activity in selective catalytic reduction of NO by NH3 (NH3-SCR) over CeO2-based catalysts was crucial for their industrial application but still faces a tough challenge, mainly owing to the insufficient acidity and overoxidation ability. Herein, the surface acidity and reducibility of CeO2 catalysts were finely tuned over Mn–W/CeO2 to efficiently eliminate NO and reveal the mechanistic origin of superior catalytic properties. Systematic surface and structure analyses revealed that Mn3O4 interacted with WO3 species in the possible form of Mn–O–W, which could enhance the dispersion of WO3 over the CeO2 surface. The resulting well-dispersed WO3 increased the concentration of both Brønsted acid sites and strong acid sites, effectively suppressing the generation of inactive nitrates and thus providing abundant catalytically active sites for the adsorption and activation of NH3. Importantly, the electron withdrawal from Mn by W atoms associated with the shortened Mn–O bond distance resulted in the appropriate reducibility over Mn–W/CeO2. Accordingly, the undesirable overoxidation of NH3 was weakened, thereby greatly increasing the high-temperature (250–400 °C) NH3-SCR activity. DFT calculations and detailed in situ DRIFTS analysis demonstrated that both “E–R” and “L–H” mechanisms contributed mainly to this superior performance.
研究领域:
催化
·
环境化学
·
表面科学
·
材料科学
·
化学反应工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Qianlin Zhang,Zhao Zhang,Yueer Ma,Wenchen Ren,Xiaomin Dai,Hui Chang,Xunjin Zhu
A series of Pt/CeO 2 compounds with hollow spheres (Pt/CeO 2 –S), wires (Pt/CeO 2 –W), and particle (Pt/CeO 2 –P) morphologies were prepared and further used for catalytic liquid organic hydrogen carrier (LOHC) dehydrogenation. The exposure and distribution of different crystal faces affected the nucleation process of crystals and then formed different microscopic morphologies. Compared with Pt/CeO 2 –W and Pt/CeO 2 –P, Pt/CeO 2 –S showed hollow spherical structures with significantly higher oxygen vacancy concentrations and specific surface areas. These structural differences not only affected platinum (Pt) dispersion, but also affected the activity and stability of the catalyst, thus promoting methylcyclohexane (MCH) conversion. The fixed bed reaction showed that Pt/CeO 2 –S had excellent catalytic activity, with the MCH conversion rate at 97.7 % and hydrogen release rate of 350.50 mmol/g (Pt) /min, and it still maintained stable activity after 72 h. Under the same conditions, the MCH conversion rates for Pt/CeO 2 –W and Pt/CeO 2 –P were only 77.23 % and 32.02 %, respectively. Therefore, through the growth pattern and morphology controls of catalyst supports, this was an effective means for improving the dehydrogenation performance of LOHC.
研究领域:
催化
·
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Analytical Methods
·
2017
·Vol. 9
·期 32
·4754-4759
·
IF 1.9
Jiaxin Lv,Qin Lei,Qiyou Xiao,Xiaomin Li,Yujie Huang,He Li
In this work, an “off–on” photoelectrochemical sensing strategy for the determination of trace kanamycin is proposed by using a kanamycin aptamer as the sensing unit, gold nanoparticles (AuNPs) and polypyrrole as the signal amplification unit and cerium dioxide as the photoelectric active material. The proposed method has a good linear range from 0.5–200 μg L−1 with a detection limit of 0.2 μg L−1 (S/N = 3). The present aptasensor showed excellent specificity and high sensitivity when it was used to determine the amount of kanamycin in milk and kanamycin sulfate injection.
研究领域:
分析化学
·
生物传感器
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Qing Huang,Chen-dong Ling,Wen-feng Zhuge,Wei Huang,Feng-ping Liu,Cui-zhong Zhang,Jin-yun Peng,Fu-xing Huang
An efficient electrochemical sensor for rutin determination based on CeO 2 /NiCo 2 S 4 acanthosphere-like microspheres and multi-walled carbon nanotubes (MWCNTs) modified electrode was proposed. In this work, we design an acanthosphere-like CeO 2 /NiCo 2 S 4 heterojunction by an “in situ growth” method of hydrothermal process. Then MWCNTs were introduced into heterostructured microspheres to form composites of CeO 2 /NiCo 2 S 4 /MWCNTs. The morphology and elemental properties of the electrochemical materials were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The redox mechanism of rutin on the working electrode surface and the electrochemical properties were investigated by cyclic voltammetry (CV), chrono coulometry (CC) and electrochemical impedance spectroscopy (EIS). The results show that the CeO 2 /NiCo 2 S 4 /MWCNTs modified glassy carbon electrode exhibited excellent electric conductivity and electrocatalytic activity toward rutin, and increased effective working area. Under the optimized condition, the fabricated sensor expressed a good linear response for rutin analysis ranging from 0.5 to 65.4 μM with a low detectable limit of 4.37 × 10 -2 μM (S/N = 3). The electrochemical sensor shows good reproducibility and reliable stability, high sensitivity and selectivity, and has been successfully applied for rutin determination in orange juice and human urine samples.
研究领域:
分析化学
·
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Frontiers of Environmental Science & Engineering
·
2018
·Vol. 12
·期 1
·1-8
·
IF 1.961
Gao Pan,Song Yuan,Wang Shaoning,Descorme Claude,Yang Shaoxia
The Fe 2 O 3 -CeO 2 -Bi 2 O 3 /γ-Al 2 O 3 catalyst, a novel environmental-friendly material, was used to investigate the catalytic wet air oxidation (CWAO) of cationic red GTL under mild operating conditions in a batch reactor. The catalyst was prepared by wet impregnation, and characterized by special surface area (BET measurement), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The Fe 2 O 3 -CeO 2 -Bi 2 O 3 /γ-Al 2 O 3 catalyst exhibited good catalytic activity and stability in the CWAO under atmosphere pressure. The effect of the reaction conditions (catalyst loading, degradation temperature, solution concentration and initial solution pH value) was studied. The result showed that the decolorization efficiency of cationic red GTL was improved with increasing the initial solution pH value and the degradation temperature. The apparent activation energy for the reaction was 79 kJ·mol –1 . Hydroperoxy radicals (HO 2 ·) and superoxide radicals (O 2 – ·) appeared as the main reactive species upon the CWAO of cationic red GTL.
研究领域:
环境科学
·
化学工程
✓ 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）