Fundamental Research
·
2021
·
IF 0
Huilin Wang,Xiaoxiao Han,Lingling Zhang,Ke Wang,Rui Zhang,Xiao Wang,Shuyan Song,Hongjie Zhang
The development of bifunctional electrocatalysts for overall water splitting is highly desired for converting electricity into chemical energy. However, the synthesis of high-performance bifunctional electrocatalysts remains a pressing challenge. Here, we found that both the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) performance of the Co 3 S 4 electrode can be significantly improved by integration with CeO 2 . Specifically, as-prepared 5% Ce-Co 3 S 4 and 1% Ce-Co 3 S 4 delivered low overpotentials of 290 and 257 mV to achieve 10 mA cm −2 for the OER and HER in 1.0 M KOH, respectively. The crucial role of CeO 2 originated from its unique surface with abundant oxygen vacancies, which were beneficial for the stabilization of Co 2+ sites with high OER activity and both the adsorption and dissociation of water molecules in the HER process. This work is expected to provide a general approach to prepare a wide range of high-performance electrode materials for energy-related applications.
研究领域:
电化学
·
材料科学
·
能量转换
✓ 已验证
产品关联
DOI
Small
·
2022
·Vol. 18
·期 23
·2201200
·
IF 15.153
Peng Jing,Peixin Liu,Minghao Hu,Xuan Xu,Baocang Liu,Jun Zhang
Electrochemical nitrogen reduction powered by renewable electricity is a promising strategy to produce ammonia. However, the lack of efficient yet cheap electrocatalysts remains the biggest challenge. Herein, hybrid Cu 2 O-CeO 2 -C nanorods are prepared on copper mesh through a metal-organic framework template route. The Cu-loaded Ce-MOF is thermally converted to Cu 2 O-CeO 2 heterojunctions with interfacial Cu-[O X ]-Ce structures embedded in carbon. Theoretical calculations reveal the lower formation energy of oxygen vacancies in Cu-[O X ]-Ce structures than in the Cu 2 O or CeO 2 phase. The Cu-[O X ]-Ce structures with oxygen vacancies enable the formation of interfacial electron-rich Cu(I) species which show significantly enhanced performance toward electrocatalytic nitrogen reduction with an NH 3 yield of 6.37 × 10 −3 µg s −1 cm −2 and a Faradaic efficiency of 18.21% in 0.10 m KOH at −0.3 V versus reversible hydrogen electrode. This work highlights the importance of modulation of charge distribution of Cu-based electrocatalysts to boost the activity toward nitrogen reduction.
研究领域:
电化学
·
材料科学
·
催化
·
可再生能源
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Engineering
·
2025
·
IF 11.6
Ying Zhu,Jingjing Liu,Guangzhi He,Shaohua Xie,Wenpo Shan,Zhihua Lian,Fudong Liu,Hong He
Catalytic activity and hydrothermal stability are both crucial for the application of the selective catalytic reduction of NO x with NH 3 (NH 3 -SCR catalyst) in diesel vehicles. In this study, a tin (Sn)-modified Ce–Nb mixed-oxide catalyst was synthesized as an NH 3 -SCR catalyst for NO x emission control. After the introduction of Sn, both the NH 3 -SCR activity and the hydrothermal stability of the catalyst were remarkably promoted. Even after hydrothermal aging at 1000 °C, the developed Ce 1 Sn 2 Nb 1 O x catalyst achieved more than 90% NO x conversion at 325–500 °C. Various methods, including N 2 -physisorption, X-ray diffraction, in-situ high-temperature X-ray diffraction, high-resolution transmission electron microscopy, X-ray photoelectron spectroscopy, X-ray absorption fine-structure spectroscopy, temperature-programmed reduction of hydrogen, temperature-programmed desorption of ammonia, and density functional theory calculations were used to investigate the promotional effects induced by the Sn species. The characterization results showed that the addition of Sn not only promoted the formation of the Ce–Nb active phase but also improved its thermal stability, contributing to the excellent NH 3 -SCR performance and hydrothermal stability. This study provides an excellent sintering-resistance catalyst for the application of diesel engine NO x emission control.
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
JOURNAL OF SOLID STATE CHEMISTRY
·
2025
·
IF 3.5
Lanlan Zhang,Qi Wang,Yuanhu Lei,Xixi Yin,Bing Lv,Qingping Dai,Yangfang Liao,Xiaolu Wang
This study fabricated a type-II heterojunction photoanode system via a two-step synthesis strategy, constructing ZnO/CeO 2 nanotube arrays (NTAs) heterostructures by using zinc oxide NTAs as the substrate with surface-loaded cerium dioxide quantum dots (QDs). Firstly, one-dimensional ZnO nanorod arrays (NRAs) structures were prepared via electrochemical deposition, followed by etching in an alkaline solution to fabricate ZnO NTAs. Subsequently, CeO 2 QDs were synthesized using a precipitation method and loaded onto the surface of ZnO NTAs through spin-coating, successfully fabricating ZnO/CeO 2 heterostructures. The ZnO/CeO 2 heterojunction exhibits a photocurrent density of 35 μA cm −2 in neutral electrolyte under zero bias,1.75 times that of pristine ZnO NTAs. Its hydrogen evolution rate increases from 9.9 μmol h −1 cm −2 to 12.8 μmol h −1 cm −2 , demonstrating enhanced photoelectrochemical performance. The enhancement mechanism of photoelectrochemical performance was analyzed through Mott-Schottky ((MS) measurements, X-ray photoelectron spectroscopy (XPS), and bandgap characterization. Theoretical simulations, including finite-difference time-domain (FDTD) and first-principles calculations, were employed to model surface electric field variations and photoexcited carrier transfer pathways, further elucidating the charge transfer mechanism within the heterostructure. The improved photoelectronic properties and hydrogen evolution performance were attributed to the synergistic effects between ZnO and CeO 2 QDs, including enhanced light absorption capacity, increased exposure of surface active sites, and efficient separation of photogenerated carriers driven by the type-II band alignment of the two semiconductors.
研究领域:
材料科学
·
纳米技术
·
能量转换
·
半导体物理
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Bing Wang,Yurou Huang,Fengxian Zhang,Jinyu Wang,Ke Wang,Cao Li,Zhenpeng Qiu,Xiaoying Wang,Ziqiang Xu
Aberrant fluctuation in Acetylcholinesterase (AChE) levels can be regarded as vital biomarkers for neurotoxicity induced by organophosphorus pesticides (OPs). The performance of 3,3′,5,5′-tetramethylbenzidine (TMB) based colorimetric detection of AChE heavily relies on catalysts with superior peroxidase (POD)-like activity. Moreover, regulation of POD-like activity through external light stimulation is gradually emerging as a promising strategy. Herein, we have fabricated AuNRs/CeO 2 hybrid catalysts with dumbbell-like structures and synthetic conditions for AuNRs/CeO 2 are also optimized in this work. The combination of AuNRs and CeO 2 impart the hybrid catalysts with near-infrared (NIR) induced photothermal effect and hot-electron injection from AuNRs to CeO 2 , thereby contributing to the NIR boosted POD-like activity. Moreover, the sensitive colorimetric detection of AChE activity is facilitated by the NIR boosted POD-like activity of AuNRs/CeO 2 hybrid catalysts. The detect principle is based on the hydrolysis of Acetylthiocholine (ATCh) by AChE to generate thiocholine (TCh) with active sulfhydryl (−SH), which contributes to the inhibition of NIR boosted POD-like activity of AuNRs/CeO 2 through aggregation. The linear range is determined to be 0.5 and 2.0 U/mL, and the LOD is estimated to be 1.122 μU/mL, which is much lower than previous work. Importantly, the activity of AChE in plasma and cerebrospinal fluid from OPs poisoned rats or pralidoxime-treated rats is accurately analyzed in this work, which is crucial for the clinical diagnosis and therapy of OPs poisoning-related disease.
研究领域:
生物化学
·
医学诊断
·
纳米材料科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Qin Zhang,Jiaqi Yang,Bo An,Ke Wang,Dongxing Song,Huijuan Su
Gd 0.1 Ce 0.9-x Ga x O 2-δ (x = 0, 0.04,0.07, 0.12) are synthesized via the citric acid-EDTA combustion method as an electrolyte material for intermediate-temperature solid oxide fuel cells. XRD and Rietveld refinement revealed that the material exhibits a single-phase cubic fluorite structure. SEM and EDS analyses demonstrated that the incorporation of Ga ions improved the sample's density, increased the grain size, and provided better element dispersion. XPS analysis confirms that Ga-Gd co-doping leads to increased oxygen vacancy concentration and modifies the oxidation states of Ce. Impedance spectroscopy results indicated that Ga-Gd co-doped ceria has higher ionic conductivity and lower activation energy compared to Gd single-doped ceria. In comparison to Gd 0.1 Ce 0.9 O 1.95 , the best-performing Gd 0.1 Ce 0.83 Ga 0.07 O 2-δ achieved nearly a 26-fold increase in ionic conductivity and a 66 % reduction in activation energy. The clearance coefficient of Gd 0.1 Ce 0.83 Ga 0.07 O 2-δ reached 100.95, while the blocking factor decreased by nearly 73 % compared to Gd 0.1 Ce 0.9 O 1.95 . The incorporation of Ga ions led to a nearly one order of magnitude reduction in the dissipation of oxygen vacancy concentration in the space charge layer, with the potential decreasing from 0.3971V (Gd 0.1 Ce 0.9 O 1.95 ) to 0.3117V (Gd 0.1 Ce 0.83 Ga 0.07 O 2-δ ). Dielectric studies clarified the contribution of the Gd-Ga synergistic effect on interfacial polarization. In terms of single-cell performance, the NiO-GDC| Gd 0.1 Ce 0.83 Ga 0.07 O 2-δ |LSCF cell exhibited higher power density and current density, particularly showing a 42.9 % performance improvement at 650 °C compared to NiO-GDC|Gd 0.1 Ce 0.9 O 1.95 |LSCF. Density functional theory calculations indicated that the incorporation of Ga ions effectively suppresses the electronic conductivity of CeO 2 and significantly reduces the formation energy, binding energy, and migration barrier of oxygen vacancies. Therefore, Ga-Gd co-doping can be regarded as an effective strategy for enhancing the performance of ceria-based electrolytes in IT-SOFCs.
研究领域:
材料科学
·
能源工程
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Symmetry-Basel
·
2025
·Vol. 17
·期 2
·224
·
IF 2.2
Yaohui Xu,Yong Li,Liangjuan Gao,Zhao Ding
CeO2has a potential application in the purification of organic dye wastewater because of the abundant oxygen vacancy (VO) defects in its crystals. In this study, a cubic CeO2microsphere with layered interleaved symmetrical 3D flower-like morphology was synthesized, and its adsorption capacity for acid orange 7 (AO7) was further enhanced by Y doping. The impact of varying amounts of Y ions on the phase composition, lattice parameters, and morphology of the product was investigated, revealing that 4 mol.% was determined as the doping level limit of Y ions in CeO2crystals. XPS, Raman, and H2−TPR techniques were employed to compare surface species changes before and after 4 mol.% Y doping in the CeO2crystals, including O−Ce(III), O−Ce(IV), O−Y(III), and VOcorrelation, yielding a rough quantitative assessment of these species. The 4 mol.% Y-doped CeO2(2.0 g/L) demonstrated the highest removal rate for 20 mg/L of AO7 dye within just 20 min to reach adsorption–desorption equilibrium, half the time required by undoped CeO2, achieving an impressive adsorption rate of 94.6%, compared to only 69.5% for undoped CeO2at 20 min. The adsorption capacity of undoped CeO2was enhanced by 19.05% through the doping of 4 mol.% Y, achieving a value of 16.56 mg/L. The feasibility of enhancing the adsorption capacity of CeO2by Y doping provides a reference for the application of CeO2and other metal oxides.
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
SURFACE & COATINGS TECHNOLOGY
·
2025
·
IF 6.1
Xiaona Ren,Zhipei Chen,Peng Wang,Wenchang Wang,Yao Wang,Changchun Ge
Rare earth oxide (CeO₂/Y₂O₃) reinforced AlCrFeNiCu high-entropy alloy coatings with a Mo interlayer (designated as Mo/CeO₂-AlCrFeNiCu and Mo/Y₂O₃-AlCrFeNiCu) were successfully deposited onto a Zr-4 substrate via high-speed laser cladding. The microstructural characteristics and properties of the composite coatings were comprehensively investigated. The results demonstrate that the Mo interlayer alleviates the thermal mismatch between the substrate and the HEA coatings and, to a certain degree, counteracts the grain refinement effect induced by the rare earth oxides. Overall, it plays a critical role in enhancing interfacial structural stability, mitigating thermal stress, and improving overall coating performance. It effectively optimizes the coating-substrate bonding integrity, reduces susceptibility to high-temperature fretting fatigue and plastic deformation, and significantly lowers the specific wear rate. Furthermore, the Mo interlayer enhances the compactness and continuity of the interface, suppresses the formation of corrosive pathways, and promotes the formation of a thicker, more stable passive film on the coating surface.
研究领域:
材料科学
·
表面工程
·
金属学与热处理
·
腐蚀与防护
·
先进制造技术
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2018
·
IF 3.927
Yalei Ding,Jiejie Wang,Shanshan Xu,Kun-Yi Andrew Lin,Shaoping Tong
In order to completely mineralization of contaminants, it is necessary to develop new methods which can effectively degrade final products of chemical oxidation. Acetic acid (HAc) has been considered one of the typical end products of chemical oxidation of pollutants and thus chosen as a representative target pollutant in the study. Nano-cerium oxide (CeO 2 ), an environment-friendly rare-earth material, was prepared to catalytic ozonation of HAc in acidic solutions. Experimental results show that the prepared CeO 2 could greatly enhance efficiency of H 2 O 2 /O 3 , and also have good stability and recyclability. The Raman spectra indicate that H 2 O 2 interacts with oxygen vacancies of CeO 2 to form peroxide-like species, which could effectively initiate the decomposition of ozone to produce hydroxyl radicals. A mechanism is proposed to explain the activity of peroxide-like species for the decomposition of ozone. The effects of different parameters such as initial pH value, catalyst dosage, and the concentration of H 2 O 2 are also investigated. The results indicate that the CeO 2 /H 2 O 2 /O 3 may provide a convenient and effective method for degrading refractory organic pollutants in acidic wastewaters.
研究领域:
环境科学
·
催化化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yuxiang Sun,Li Xu,Xin Liu,Yaodong Shen,Yu Zhang,Ning Gu,Fei Xiong
Superoxide anion (O 2 •-), hydrogen peroxide (H 2 O 2 ), hydroxyl radical (•OH) are the main components of endogenous reactive oxygen species (ROS), while •OH shows the most significant cytotoxicity to tumor cells. Thus effective and continuous •OH generation is critical to ROS-based tumor treatment. Herein, we assembled coronal-shaped Fe 3 O 4 @CeO 2 nanoparticles (NPs) to achieve relay conversion of O 2 •- → H 2 O 2 → •OH in acute myeloid leukemia (AML) cells, where CeO 2 NPs function as the mimetic enzyme of superoxide dismutase (SOD) to convert O 2 •- → H 2 O 2 and Fe 3 O 4 NPs act as the peroxidase (POD) mimetic enzyme to realize H 2 O 2 → •OH. We found that assembled Fe 3 O 4 @CeO 2 got an enhanced POD activity and SOD activity due to the mechanism of more efficient relay conversion at sub-nanometer distance. As a result, assembled Fe 3 O 4 @CeO 2 successfully promoted the relay conversion of O 2 •- → H 2 O 2 → •OH in vitro and in AML cells, causing a continuous generation of •OH by utilizing the oxygen source of endogenous O 2 •- and endogenous H 2 O 2 . In AML cells, reportedly, O 2 •- and H 2 O 2 were both in high levels and the generation of O 2 •- is sustainable. Furthermore, Fe 3 O 4 @CeO 2 -driven the endogenous ROS axial conversion exacerbated AML cells apoptosis and prolonged the survival time of systemic AML mice, showing the worth of this relay conversion mechanism. Therefore, assembled Fe 3 O 4 @CeO 2 provides an ideal tool for the directed conversion of intracellular ROS and continuous generation of •OH. Importantly, the targeted conversion of ROS by assembling multi-enzyme system is an effective strategy for the intervention of ROS.
研究领域:
纳米技术
·
癌症生物学
·
生物化学
·
治疗学
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 8
·3563-3572
·
IF 2.7
Wendi Lv,Ziyuan Gao,Huijuan Wu,Lizhi Liu,Huiyong Wang,Baozhan Zheng,Juan Du,Yong Guo
Highly efficient and low-cost materials for the degradation of organic dyes in wastewater remain the focus of environmental protection and water pollution control, in which, nanozymes have been at the forefront for the development of a new platform and aroused more and more attention. In this work, a nanoceria@shaddock peel-derived nanocomposite (Ce@CSP) with excellent peroxidase-like performance in methyl violet (MV) degradation as well as ascorbic acid (AA) detection was synthesized by a simple one step in situ pyrolysis of cerium ammonium nitrate (Ce(NH4)2(NO3)6) and pretreated shaddock peel. By means of the cooperative-reinforcing peroxidase-like activity of the porous carbon material originating from shaddock peel (CSP) and the loaded CeO2 nanoparticle, the obtained nanozyme Ce@CSP displayed a superior catalytic ability in the catalyzed oxidation of the chromogenic substrate 3,3′,5,5′-tetramethylbenzidine (TMB) in the presence of H2O2. Specifically, a synergetic absorbent property was also demonstrated by the porous carbon material, bringing the target molecules in close proximity to the nanozyme catalyst and therefore enabling effective decoloration of MV and colorimetric detection of AA with a linear range of 1.6–17.3 μM and a detection limit of 1.07 μM. The current work has realized effective decoloration of MV in real water samples and provided a wide range of potential applications of low-cost and eco-friendly materials in organic dye treatment.
研究领域:
环境科学
·
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES B-BIOINTERFACES
·
2024
·
IF 5.4
Mingyuan Chi,Jichun Liu,Lianxin Li,Yuewen Zhang,Meng Xie
Alzheimer’s disease (AD) is complex and multifactorial, and its pathogenesis involves multiple factors and processes. This study pioneered the in situ growth of cerium oxide nanoparticles on macrophage membranes (Ce-RAW). Further, carbon quantum dots (CQD) were biomimetically modified by Ce-RAW, leading to the synthesis of a multifunctional nanocomposite (CQD-Ce-RAW). Within the framework of this research, CQD-Ce-RAW was strategically combined with photothermal therapy (PTT), aiming to achieve a more significant therapeutic effect. The macrophage membrane confers the system with anti-phagocytic and anti-inflammatory biological functions. More importantly, the ultra-small size of cerium oxide grown on the membrane acts as a reactive oxygen species (ROS) scavenger and alleviates the degree of oxidative stress. Meanwhile, CQD as a photosensitizer helps dissociate amyloid-β (Aβ) aggregates and chelates excess copper ions, thus further inhibiting Aβ aggregation. Cell experiments showed that CQD-Ce-RAW combined with PTT could effectively degrade and inhibit the aggregation of Aβ, remove ROS, and improve cell survival rate. The results of in vivo photothermal experiments demonstrated that near-infrared light enhanced the efficiency of drug penetration through the blood-brain barrier and facilitated its accumulation in brain tissue. This comprehensive therapeutic approach can intervene in the disease progression from multiple pathways, providing a new prospect for treating AD.
研究领域:
生物医学工程
·
神经科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）