RSC Advances
·
2025
·Vol. 15
·期 13
·9997
·
IF 4.6
Zhendong Fu,Jiahe Qiu,Ping Gong,Danhong Zhang,Liping Wang
The precise and sensitive quantification of total antioxidant capacity (TAC) is indispensable for evaluating the quality of foods rich in antioxidants. In this investigation, a novel nanozyme exhibiting robust oxidase activity was synthesized via a sonochemical doping process utilizing copper ions and the modification of 2-propylimidazole onto nanoceria. Subsequently, a CeO2@Cu-PrIm/ox-TMB assay system was successfully formulated, furnishing a practical and highly sensitive analytical tool for TAC determination. The colorimetric sensor exhibited a linear response over a concentration range of 1 μM to 70 μM, accompanied by a limit of detection (LOD) of 1.26 μM under meticulously screened conditions. This assay displayed substantial practical utility for TAC analysis in fruits, attributed to its exceptional accuracy and selectivity. This research endeavor may offer a novel direction for the design of nanozymes and colorimetric biosensors possessing heightened oxidase activity, thereby advancing the field of analytical chemistry and food science. Schematic depicting the reaction system of CeO2@Cu-PrIm/ox-TMB assay for the determination of TAC.
研究领域:
分析化学
·
食品科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Zijian Wang,Yajing Chen,Jishun Guo,Dongzhi Zhang,Mingcong Tang,Yuehang Sun,Xingyan Shao
Hydrogen (H 2 ) is one of the most critical gases in transformer oil. In this paper, an H 2 sensor based on spindle-shaped multilateral CeO 2 rods in micron size and TiO 2 quantum dots (QDs) with an average size of 3.09 nm was designed. The sensor based on CeO 2 with 1 wt%TiO 2 has the best performance and is labeled as Ce–Ti1 sensor. The Ce–Ti1 sensor operates at 250 °C and has the better response value of 52.51% to H 2 of 1000 ppm. The response time is less than 1 s for 2000 ppm H 2 and the response time is 1 s. The Ce–Ti1 sensor has low response values for several dissolved gases in transformer oils (5.78 times than 1000 ppm C 2 H 6 , 9.28 times than 50 ppm CO, and 18.04 times than 1000 ppm CH 4 ). The response of the Ce–Ti1 sensor is affected by humidity, while it shows good long-term stability and repeatability. The response intensity can decrease by 50.21% in RH = 85% compared with sensing performance in RH = 33%. First-principle calculations are used to analyze the H 2 -sensing properties of TiO 2 , CeO 2 , and their composite heterostructures from a microscopic perspective. The adsorption mechanism between the Ce–Ti1 heterojunction and H 2 molecules is analyzed by the adsorbed oxygen mechanism. The construction of DFT calculations and H 2 -sensitive mechanism models can provide guidance for the subsequent construction of high-performance CeO 2 -based gas sensors.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 56
·44828-44834
·
IF 3.84
Yaohui Xu,Ruixing Li
A combined bottom-up and top-down route was developed for the template-free synthesis of mesoporous CeO2 powders using Ce(NO3)3·6H2O, NH4HCO3, H2O2, and H2O as starting reagents. The flake-like Ce2(CO3)3·8H2O precursor was etched by H2O2, and CeO2 nucleated in situ with built-in equiaxed particles. Pores formed on the flakes owing to the loss of by-products of H2O and CO2. The formation of the mesostructured CeO2 could also be explained by the large change in volume induced as a result of the difference in density between Ce2(CO3)3·8H2O and CeO2. Accordingly, the original flake-like morphology of Ce2(CO3)3·8H2O was not preserved upon pore formation and during continuous stirring in the synthesis. A subsequent hydrothermal treatment destroyed the loose aggregates of CeO2 derived from the reaction between H2O2 and Ce2(CO3)3·8H2O. Rearrangement of the CeO2 particles via a dissolution–recrystallization process occurred under certain temperatures and pressures. Consequently, CeO2 particles with coarser sizes, smoother surfaces, and mesoporous structures were obtained. The specific surface area of the particles was 166.5 m2 g−1 after hydrothermal treatment at 200 °C for 24 h. The mesoporous CeO2 particles possessed better adsorption capacities of acid orange 7 dye than basic orange 2 dye in the absence of pH pre-adjustments. The saturated adsorption amount of acid orange 7 dye was 510.2 mg g−1 at 298 K based on Langmuir linear fitting of the experimental data.
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DOI
高影响因子
ACS Catalysis
·
2024
·
IF 11.3
Pengfei Liu,Changlong Zheng,Wei Liu,Xiaodong Wu,Shuang Liu
Controlling the oxidative redispersion behavior of supported metal nanoparticles is of central importance in producing high-performance catalysts applied under industry-related oxidation conditions. So far, considerable efforts have been paid to understanding reactant (including O2)-induced disintegration, while much less is known about the influences of support defects like hydroxyl (OH) and oxygen vacancy (VO) on the stabilization of metal–reactant complexes. In this article, by using H2 as a reducing agent, the roles of OH groups and VO in oxidative redispersion of Ru over CeO2 nanorods were distinguished and further disentangled by comparison with the cases of CO-pretreated Ru/CeO2. Supported by electron microscopy, in situ diffuse reflectance infrared Fourier transform spectroscopy, in situ X-ray photoelectron spectroscopy, Raman, and other characterizations, we showed that the doubly bridging OH (II) groups on CeO2(111) steps (type II or III) played major roles in stabilizing Ru–Ox complexes and producing atomically dispersed Ru species, while the surface VO sites assisted dehydrogenation and prevented OH overcapping on the reactive Ru sites. The propylene combustion activity of the thus-obtained single-site Ru/CeO2 was far superior to that of a benchmark Pt/Al2O3 catalyst. The results suggested that well-designed H2 treatments could be used to maximize the effectiveness of (reactant-induced) metal redispersion over CeO2, and attention should be paid on possible metal redispersion when dealing with catalysis over systems accessible to reactants (e.g., hydrogen, water, and/or hydrocarbons) that give rise to CeO2 surface hydroxyls in working conditions.
研究领域:
催化化学
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材料化学
·
表面科学
·
纳米材料
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环境催化
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2017
·
IF 5.951
Yafu Tang,Yuechao Yang,Dongdong Cheng,Bin Gao,Yongshan Wan,Yuncong C. Li
Soil, air, and water pollution caused by lignite is considered a serious environmental problem. Activation methods thus have been developed to extract humic acid from lignite to support the agricultural production as the soil amendment or fertilizer synergist. The traditional activation methods of humic acid from lignite, however, are not environmentally friendly. As the first study, this work developed a novel solid-phase activation method with a Pd/CeO2 nanocatalyst for lignite-derived humic acid. This study analyzed the morphology and structures of the as-synthesized Pd/CeO2 nanocatalyst with various characterization tools. The mechanisms of the Pd/CeO2 nanocatalyst for lignite activation were determined. The Pd/CeO2 catalyst effectively promoted the production of water-soluble humic acids from lignite via KOH solid-phase activation at room temperature. It increased the amount of small molecular active groups and the corresponding small molecules of humic acid. The existence of a strong synergistic effect at the interface sites between Pd/CeO2 nanoparticles and lignite was one of the key factors for the outstanding catalytic performance. In conclusion, this study has great application perspectives for reducing lignite pollution and increasing humic acid utilization by crops, which can improve the sustainability of the environment and agricultural systems.
研究领域:
环境科学
·
催化化学
·
土壤科学
·
纳米技术
·
农业化学
✓ 已验证
DOI
高影响因子
Nanomaterials
·
2026
·Vol. 16
·期 2
·121
·
IF 4.3
Xianlian Mu,Tao Jin,Pengfei Xie,Rongcao Yu,Bin Li,Xin Yuan
Corrosion in harsh environments causes global economic losses exceeding 3 trillion US dollars annually. Traditional silicone epoxy (SE) coatings are prone to failure due to insufficient physical barrier properties and lack of active protection. In this study, cerium dioxide (CeO2) was in situ grown on the surface of hexagonal boron nitride (h-BN) mediated by polydopamine (PDA) to prepare BN-PDA-CeO2ternary nanocomposites, which were then incorporated into SE coatings to construct a multi-scale synergistic corrosion protection system. Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), and transmission electron microscopy (TEM) confirmed the successful preparation of the composites, where PDA inhibited the agglomeration of h-BN and CeO2was uniformly loaded. Electrochemical tests showed that the corrosion inhibition efficiency of the extract of this composite for 2024 aluminum alloy reached 99.96%. After immersing the composite coating in 3.5 wt% NaCl solution for 120 days, the coating resistance (Rc) and charge transfer resistance (Rct) reached 8.5 × 109Ω·cm2and 1.2 × 1010Ω·cm2, respectively, which were much higher than those of pure SE coatings and coatings filled with single/binary fillers. Density functional theory (DFT) calculations revealed the synergistic mechanisms: PDA enhanced interfacial dispersion (adsorption energy of −0.58 eV), CeO2captured Cl−(adsorption energy of −4.22 eV), and Ce3+formed a passive film. This study provides key technical and theoretical support for the design of long-term corrosion protection coatings in harsh environments such as marine and petrochemical industries.
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产品关联
DOI
PubMed
高影响因子
Catalysis Science & Technology
·
2026
·
IF 4
Jiming Wang,Min Ji,Min Wang
Photo-thermo-chemical dry reforming of methane (PTC-DRM) presents advantages over thermocatalytic DRM by storing solar and thermal energy as chemical energy, yet maintaining high efficiency and stability remains a challenge. Herein, we report an efficient PTC-DRM process on Ni–Co–Ce–Al catalysts and investigate the synergistic effect of Ni and Co on reaction performance. Characterization results revealed that the introduction of Co increases the concentration of acidic sites on the Ni-based catalyst surface. An appropriate number of acidic sites facilitates the DRM reaction. Co-incorporated catalysts demonstrate excellent light responsiveness, and generate more energetic hot charge carriers under light irradiation. Density functional theory (DFT) calculations confirm that the interfacial electronic structure of the Ni–Co–Ce–Al catalyst facilitates spontaneous electron transfer from CeO2 to NiCo bimetallic quantum dots (QDs), which is mediated by the built-in electric field at the metal–semiconductor interface—attributed to the inherent work function difference between CeO2 (5.45 eV) and NiCo alloys (4.93 eV). The incorporation of an optimal amount of Co significantly improves the catalytic performance, with the Ni0.9–Co0.1–Ce–Al catalyst exhibiting the highest thermal and photocatalytic activity. At 650 °C, the conversions of CH4 and CO2 increased from 55.8% and 60.1% under dark conditions to 65.1% and 67.9% under light irradiation, respectively. Accordingly, the yields of H2 and CO increased from 21.4 and 26.5 μmol min−1 g−1 to 23.6 and 27.7 μmol min−1 g−1. This study demonstrates that the synergy between bimetallic components coupled with photothermal integration can effectively enhance DRM efficiency and coke resistance, providing a valuable catalyst design strategy for solar-driven conversion of carbon resources.
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Haiyang Zhang,Xiujuan Ma,Hongyan Zhang
A CeO 2 /Zn 2 SnO 4 ammonia (NH 3 ) sensor with excellent sensing performance was prepared by a one-step hydrothermal method, and the effect of surface oxygen vacancies on the performance of the sensor was analyzed by density functional theory (DFT). Experimental results show that the construction of CeO 2 /Zn 2 SnO 4 heterojunction can improves the content of oxygen vacancies on the surface of Zn 2 SnO 4 , which provides more adsorption active sites for NH 3 molecules and effectively improves the gas sensing performance of the sensor. DFT results indicate that surface oxygen vacancies facilitate the charge transfer caused by the adsorption of NH 3 molecules by CeO 2 , thereby increasing the binding energy of NH 3 molecules. Additionally, the surface oxygen vacancies can cause the structure of Zn 2 SnO 4 to deform during the adsorption of NH 3 , leading to significant electron hybridization and thereby increasing the binding energy of NH 3 molecules. In addition, CeO 2 /Zn 2 SnO 4 sensor was successfully applied to detect the NH 3 gas concentration released by different levels of freshness of beef, providing an effective method for monitoring the freshness of high-protein foods.
研究领域:
材料科学
·
气体传感器
·
食品质量监测
·
纳米材料
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2022
·
IF 4.598
Mingyuan Chen,Yaxin Lv,Peilin Wu,Liuyan Dong,Xingquan He,Lili Cui
To obtain highly active electrocatalyst for the whole electrochemical water splitting is of importance to generate hydrogen. Co(OH) 2 is used as electrocatalyst towards OER, however, the performance can be improved further. Usually, to construct the interface and adjust the electronic environment of electrocatalysts are regarded as powerful ways to improve the activity. Herein, CeO 2 -Co(OH) 2 sheets supported on copper foam (CF) are fabricated by electrodeposition method. The morphology and the electron structure of metals are adjusted by changing the molar ratio of Co to Ce, thus, resulting in different electrocatalytic activity. The optimal hybrids of CeO 2 -Co(OH) 2 exhibits lower overpotentials of 188, 269 mV to reach 10 mA cm −2 towards HER and OER, respectively, and good stability. Notably, it is found that the electroactivity is extremely superior to that of bare CF as well as the counterparts in the literature. Also, we try to employ M(OH) 2 (M = Fe, Ni) to substitute Co(OH) 2 to investigate the effect of species of hydroxides on the electron interaction between CeO 2 and hydroxides, the XPS results indicate that Ce and Co shows stronger electron interaction compared to other two control hydroxides. As electrocatalysts for alkaline full water splitting, CeO 2 -Co(OH) 2 requires a cell voltage of 1.62 V to drive 10 mA cm −2 . Experimental results prove the advantages of the electron engineering and morphology control.
研究领域:
材料科学
·
电化学
·
能源化学
·
纳米材料
·
催化化学
✓ 已验证
DOI
高影响因子
CRYSTAL RESEARCH AND TECHNOLOGY
·
2014
·Vol. 49
·期 6
·383-392
·
IF 1.164
Xiufang Liu,Wei Liu,Xueying Zhang,Lu Han,Cong Zhang,Yanzhao Yang
Zirconium-doped ceria hollow slightly-truncated nano-octahedrons (HTNOs) (Ce 1-x Zr x O 2 ) were synthesized by a one-pot, facile hydrothermal method. The morphology and crystalline structure were characterized with powder X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM) and the high resolution transmission electron microscopy (HRTEM). The composition and chemical valence on the surface of the as-prepared Ce 1-x Zr x O 2 powders were detected by X-ray photoelectron spectroscopy (XPS) and energy dispersive spectrometry (EDS). The surface area and pore size distribution of as-obtained Zr-doped ceria HTNOs were measured by N 2 adsorption-desorption measurement. Mechanisms for the growth of Zr-doped ceria HTNOs are proposed as both oriented attachment and Ostwald ripening process and the formation of the hollow structure is strongly dependent on the addition of Zr 4+ ions. Furthermore, the as-obtained Zr-doped ceria HTNOs revealed superior catalytic activity and thermal stability toward CO oxidation compared to pure ceria. It may provide a new path for the fabrication of inorganic hollow structures on introducing alien metal ions.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2025
·
IF 6.2
Xiaohua Li,Zhufeng Liu,Shanshan Shao,Yongbo Yu,Weicheng Wang,Tianrui Sun,Shiliang Wu
Steam reforming of bio-oil is a promising technology for the industrial-scale conversion of biomass into hydrogen energy, in which the catalyst plays the crucial role. This study proposes a Ni-Ca-Al-Ce-O catalyst, prepared by CaO loading onto Ni/CeO 2 ·Al 2 O 3 , and tested in the two-stage adsorption-enhanced reforming of biomass pyrolysis oil for hydrogen production. The effects of carrier type and Ni loading on the physicochemical properties of the Ca modified Ni-based reforming catalyst and its reforming performance were investigated, and its reusability was tested finally. The results revealed that more Ni metal active sites are available on CeO 2 ·Al 2 O 3 compared to biochar as carrier. However, side reactions such as ketonization were significantly promoted due to the metal oxides in red mud (RM), resulting in a large amount of methane as a by-product over the Ni/RM catalyst. When Ca additive introduced on the well selected Ni/CeO 2 ·Al 2 O 3 , the selectivity of hydrogen in the reforming gas was enhanced. Meanwhile, more spinel NiAl 2 O 4 was formed due to the interaction between NiO and Al 2 O 3 , which enhanced the stability and activity of the Ni-Ca-Al-Ce-O catalyst. With a Ca/Al ratio of 1:1, Ni was more uniformly dispersed, and the yield and selectivity of hydrogen reached 73.35 % and 76.90 %. In the reusability tests, the yield of hydrogen remained above 60 % after six runs, which was superior to that of similar reforming catalysts, suggesting that the proposed Ni-Ca-Al-Ce-O catalyst is reliable in terms of reusability.
研究领域:
能源化学
·
催化材料
✓ 已验证
产品关联
DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2018
·Vol. 24
·期 19
·4902-4908
·
IF 5.16
Yu-Ping Qiu,Hui Yin,Hao Dai,Li-Yong Gan,Hong-Bin Dai,Ping Wang
Graphical Are two metals better than one? Surface modification of a Ni nanocatalyst by Ir results in remarkably improved catalytic properties towards H 2 generation from N 2 H 4 ⋅ H 2 O. Coupled experimental and theoretical studies reveal that the formation of Ni−Ir alloy on the catalyst surface plays a crucial role in determining the catalytic performance (see figure). Selective decomposition of hydrous hydrazine (N 2 H 4 ⋅ H 2 O) over metal catalysts provides a promising means for onboard or portable hydrogen source applications. Studies on N 2 H 4 ⋅ H 2 O decomposition catalysts mainly focus on the effects of bulk composition and structure on their performances, instead of the surface-composition-dependent properties. Herein, the synthesis of an Ir-modified Ni/ meso -CeO 2 catalyst is reported by using a combination of colloidal solution combustion synthesis and galvanic replacement methods. A combination of structural characterization, control experiments, and DFT calculations reveals that the Ni−Ir alloy resulting from calcination treatment exerts a profound effect on the catalytic properties. The resulting Ni@Ni−Ir/ meso -CeO 2 catalyst shows excellent catalytic performance towards hydrogen generation from N 2 H 4 ⋅ H 2 O, which compares favorably with the Ni−Ir bimetallic catalysts reported to date.
研究领域:
材料科学
·
催化化学
·
理论计算化学
✓ 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）