SURFACE & COATINGS TECHNOLOGY
·
2017
·
IF 2.589
Lianbo Wang,Ming Chen,Huabing Liu,Chuanhai Jiang,Vincent Ji,Florent Moreira
In present work, the ternary Ni-Ti-CeO 2 composite coatings were electrodeposited on Al matrix composite (CNT/7075) in traditional Watts' solution containing various concentrations of CeO 2 nanoparticles and constant concentration of Ti microparticles . The effects of CeO 2 nanoparticles on microstructure and corrosion resistance of the obtained composite coatings were comprehensively investigated. The incorporation of moderate CeO 2 nanoparticles (less than 10 g L − 1 in Watts' solution) gave rise to grain refinement, random-orientation growth of nickel deposit and smooth surface of the composite coating. Corrosion tests of the Ni-Ti-CeO 2 composite coatings in 3.5 wt% sodium chloride (NaCl) at 25 °C illustrated the optimised microstructure favoured the enhancement of corrosion resistance. Further analyses of the corrosion behavior demonstrated that the embedded CeO 2 nanoparticles facilitated the formation of a compact passive film on the surface of the composite coatings during corrosion and promoted the formation of TiO 2 on the surface of Ti microparticles. The formation of TiO 2 not only protected the Ti metal particles but also helped to improve the corrosion resistance of the composite coatings, because the TiO 2 coated Ti microparticles decreased the attack probability of nickel deposits by corrosive medium. Typically, the Ni-Ti-CeO 2 composite coating electrodeposited in Watts' solution containing 10 g L − 1 CeO 2 nanoparticles possessed the best corrosion resistance and excessive CeO 2 nanoparticles deteriorated the corrosion resistance.
研究领域:
材料科学
·
电化学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
·
IF 20.2
Chunmin Zhang,Chunli Wang,Qingyun Shi,Xiaoli Wang,Shaolei Zhao,Long Liang,Qingshuang Wang,Limin Wang,Yong Cheng
The high hydrogen release temperature and thermodynamic stability of the coordination hydride LiAlH 4 render it unsuitable for direct application. This work intends to improve the hydrogen release properties via compositing LiAlH 4 and AlH 3 with similar initial hydrogen release temperatures and introduce efficient additive Ni/CeO 2 composite. The thermal stability of the composite system LiAlH 4 -AlH 3 is enormously reduced compared to that of LiAlH 4 . In addition, the preferential release of hydrogen from LiAlH 4 in the composite system provides additional heat for the subsequent release of hydrogen from AlH 3 , accelerating the hydrogen release process. As a result, LiAlH 4 -AlH 3 -Ni/CeO 2 composite performs enhanced hydrogen release performance with a hydrogen release capacity of 8.27 wt% hydrogen within 300 ℃ and a dehydrogenation onset temperature as low as 72.9 ℃. The enthalpy change of the first step hydrogen release reaction decreases from −11.99 kJ mol −1 (LiAlH 4 ) to −2.02 kJ mol −1 (LiAlH 4 -AlH 3 ). Theoretical calculations indicate that both atomic dehybridisation and electron redistribution expedite the breaking of the Al-H bond and the consequent release of hydrogen.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Biomedical Materials
·
2023
·Vol. 18
·期 6
·065006
·
IF 4
Jing Zhang,Miaomiao Hu,Changchun Wen,Jian Liu,Fang Yu,Juan Long,Xiang-Cheng Lin
Single tumor treatment method usually has some defects, which makes it difficult to achieve good therapeutic effect. The ingenious combination of multiple tumor treatment methods on a single nanoplatform to achieve multifunctional treatment can effectively improve the efficiency of treatment. The targeted modification of nanomaterials can augment the precision of nanotherapeutic drugs in tumor treatment. Herein, a multifunctional nanoplatform (CeO2@CuS@PDA-FA) based on cerium dioxide nanoparticles engineered with copper sulfide (CeO2@CuS) has been constructed for synergistic photothermal therapy (PTT) and chemodynamic therapy (CDT). The CeO2@CuS were coated using polydopamine (PDA), and the modification of PDA surface by folic acid, in order to achieve the targeted effect for tumors. The localized hyperthermia induced by PTT can further improve the CDT efficiency of the nanoplatform, leading to a PTT/CDT synergistic effect. The nanoplatform possessed the capability of cancer cell-targeted and achieved better therapeutic efficacy in vitro. This work provided a new strategy for combined multifunctional theranostic platform and shows strong potential in practical applications.
研究领域:
纳米医学
·
癌症治疗
·
生物材料
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2020
·Vol. 9
·期 3
·1655-1662
·
IF 11.301
Mengjie Lu,Duo Chen,Boran Wang,Ruiqing Li,Dong Cai,Haoran Tu,Hang Yang,Yupu Zhang,Wei Han
Developing high-efficiency non-precious electrocatalysts for alkaline hydrogen evolution reaction (HER) is critical for practical application in water splitting. Abundant HER electrocatalysts exhibit high activity in acids, but deliver inferior performance in alkalis due to sluggish kinetics. Herein, motivated by the promoter CeO2 (rich in oxygen vacancies) that can modulate the electronic structure of materials, a high-efficiency catalyst of Co4N nanowires by coupling CeO2 vertically grown on Ni foam (Co4N–CeO2/NF) is prepared by composition control and interface engineering. Anchoring CeO2 into Co4N will endow the catalyst with superhydrophilic and superaerophobic properties, and simultaneously promote water adsorption/dissociation, which dramatically boost the alkaline HER performance. The as-synthesized self-supported Co4N–CeO2/NF electrode exhibits fairly low overpotentials of 52 and 149 mV at current densities of 10 and 100 mA cm−2 for HER in 1.0 M KOH electrolyte, respectively. Furthermore, after a long-time operation of 24 h at a fixed high current density of 100 mA cm−2, the required overpotential is increased only by 4 mV, showing the extraordinary long-time durability and promising potential in mass applications. This work will provide an effective strategy for rational design and activity enhancement of other non-precious metal-based HER electrocatalysts.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ADVANCED MATERIALS
·
2021
·Vol. 33
·期 42
·2102593
·
IF 30.849
Tengyuan Dai,Xin Zhang,Mingzi Sun,Bolong Huang,Nan Zhang,Pengfei Da,Rui Yang,Zidong He,Wei Wang,Pinxian Xi,Chun-Hua Yan
Structural engineering and compositional controlling are extensively applied in rationally designing and fabricating advanced freestanding electrocatalysts. The key relationship between the spatial distribution of components and enhanced electrocatalysis performance still needs further elaborate elucidation. Here, CeO 2 substrate supported CoS 1.97 (CeO 2 -CoS 1.97 ) and CoS 1.97 with CeO 2 surface decorated (CoS 1.97 -CeO 2 ) materials are constructed to comprehensively investigate the origin of spatial architectures for the oxygen evolution reaction (OER). CeO 2 -CoS 1.97 exhibits a low overpotential of 264 mV at 10 mA cm −2 due to the stable heterostructure and faster mass transfer. Meanwhile, CoS 1.97 -CeO 2 has a smaller Tafel slope of 49 mV dec −1 through enhanced adsorption of OH − , fast electron transfer, and in situ formation of Co(IV)O 2 species under the OER condition. Furthermore, operando spectroscopic characterizations combined with theoretical calculations demonstrate that spatial architectures play a distinguished role in modulating the electronic structure and promoting the reconstruction from sulfide to oxyhydroxide toward higher chemical valence. The findings highlight spatial architectures and surface reconstruction in designing advanced electrocatalytic materials.
研究领域:
材料科学
·
电催化
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Xiaodong Wei,Guoliang Hou,Yulong An,Pan Yang,Xiaoqin Zhao,Huidi Zhou,Jianmin Chen
6-8 wt% yttria-stabilized zirconia (YSZ) has been widely employed as thermal barrier coating (TBC) to protect the high-temperature components of aero-engine and gas-turbine. However, the phase transition and sintering densification at high temperature seriously limit its application above 1200 °C. On account of this, CeO 2 and Sc 2 O 3 were doped into the YSZ by solid-state reaction sintering method in this paper. The effects of doping on the crystal structure, phase transition behavior and sintering resistance were investigated on the basis of XRD, Raman and FESEM , and the evolution of thermal properties of the ceramics was also analyzed. The results indicated that doped CeO 2 increases the cell volume and tetragonal degree, but doped Sc 2 O 3 was opposite. Co-doping caused not only significant difference in atomic mass and radius but also the formation of a large number of oxygen vacancies in the ceramics. Therefore, CeScYSZ showed the lowest thermal conductivity (1.53 W‧m −1 ‧K −1 ), which was about 23% lower than that of YSZ (2.00 W‧m −1 ‧K −1 ). More importantly, the oxygen vacancy also effectively stabilized the octet lattice, while the increase of lattice energy caused by Sc-O bond made it difficult for ions to misplace, which finally well prevented the transformation from t phase to m phase. There was no detrimental m -ZrO 2 phase formation in the CeScYSZ after 120 h at 1500 °C. Besides, Co-doping could simultaneously overcome the poor sintering resistance caused by single CeO 2 doping and the lower thermal expansion coefficient caused by single Sc 2 O 3 doping, thus the CeScYSZ should be an ideal long-acting thermal protection material at higher temperatures.
研究领域:
材料科学
·
高温材料
·
陶瓷材料
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Xin Gao,Baodong Li,Shouwei Jian
The fabrication of visible-light-driven heterostructured photocatalysts has been regarded as a promising strategy to enhance the photocatalytic performance. Here, a wet chemical method was adopted to prepare step-scheme CeO 2 /CaIn 2 S 4 (CCIS) composites. The CeO 2 nanoparticles were deposited on the surface of CaIn 2 S 4 (CIS) to form a tight interface, namely, heterojunction , which was confirmed by the multiple characterization methods. The formed heterojunction between CeO 2 and CIS was advantageous to promoting the charge carrier separation and migration. The photocatalytic performance of the resulted CCIS composites were evaluated by the Cr(Ⅵ) reduction under visible light irradiation. The optimized CCIS-10 sample exhibited the highest photocatalytic Cr(Ⅵ) reduction activity with the efficiency of 95% within 105 min. The enhanced photocatalytic activity of CCIS was attributed to the construction of step-scheme heterojunction system, leading to the efficient charge separation and high redox potential . The proposed mechanism for the enhanced photocatalytic performance was fully discussed and confirmed. This work may provide a simple strategy to rationally design efficient photocatalyst for Cr(Ⅵ) removal.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2022
·
IF 5.304
Huan Jiang,Baihui Wang,Ruyi Tang,Yaoyu Tan,Mengyao Qi,Xia Zhang
Although thiourea and its derivatives are applied in medical, food, and chemical industries, sensitive thiourea detection remains a challenging and noticeable topic. Surface-enhanced Raman spectroscopy assay based on an enzyme-inhibition strategy is promising for the detection of thiourea residues. Therefore, in this study, Ag/CeO 2 nanomaterials with dual enzyme-Like Activities were synthesized to detection thiourea. We discovered that the Ag/CeO 2 nanozymes demonstrated strong peroxidase-like activity and oxidase-like activity, moreover they can accelerate and catalyze 3,3′,5,5′-tetramethylbenzidine enzymatic reaction , with significantly increasing the Raman signal. Instead, once thiourea was introduced into Ag/CeO 2 nanozymes, due to the influence of thiourea molecules occupation and nanozymes aggregation, the peroxidase-like activity and oxidase-like activity of Ag/CeO 2 decreased sharply, and the colorless substrate 3,3′,5,5′-tetramethylbenzidine would not undergo color changes. Based on this observation, a Raman method for detecting thiourea using oxidized 3,3′,5,5′-tetramethylbenzidine as a probe molecule was developed. The Raman intensity showed a good linearity for the concentration of thiourea in the range of 10 −11 M−10 −1 M with a correlation coefficient of R 2 = 0.9881, and the limit of detection is 2.4 × 10 −13 M. Therefore, the proposed Raman mode sensors exhibited excellent selectivity and anti-interference ability which offers a new avenue for exploiting environmental monitoring.
研究领域:
分析化学
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环境科学
·
生物医学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yu-Xuan Fu,Shu-Yi Huang,Ming-Shuai Sun,Yan Zhou,Dan-Dan Cai,Wen-Shuai Zhu,Wei Hui,Duan-Jian Tao
Current industrial catalysts for α-pinene hydrogenation suffer from harsh reaction conditions and poor selectivity to cis -pinane, primarily due to their inability to effectively adsorb α-pinene in a specific favorable configuration on the catalyst surface. In this study, a high-specific-surface-area, rod-shaped CeO 2 -supported ultra-fine Ru nanoparticle (average particle size of 4 nm) catalyst was synthesized via hydrothermal method for the highly stereoselective hydrogenation of α-pinene to cis -pinane. The resulting Ru/CeO 2 -H catalyst achieved an α-pinene conversion of 99.3 % and an impressive cis -pinane selectivity of up to 99.6 % under exceptionally low temperature (30°C), 0.6 MPa H 2 and 0.5 h with high TOF (1236 h −1 ). Density functional theory (DFT) calculations indicated that α-pinene preferentially adsorbs onto the Ru surface via the backside of its intramolecular dimethyl bridge. This particular adsorption mode lowers the energy barriers for further hydrogenation to generate cis -pinane. The oriented dimethyl-up configuration of α-pinene and ultra-low activation energy (12.04 kJ/mol obtained from kinetic tests) enable the highly selective production of cis -pinane at ambient temperature. Furthermore, the strong interaction between the CeO 2 -H support and highly dispersed Ru, combined with the ambient-temperature reaction conditions, effectively prevents metal nanoparticle agglomeration and coking, imparting the catalyst with exceptional stability. Notably, the catalyst was reused at least 15 times without observing any significant deactivation, demonstrating its significant potential for practical applications.
研究领域:
催化化学
·
材料科学
·
理论化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Xisong Mao,Xuewen Xia,Junqi Li,Chaoyi Chen,Xiaoying Gu,Song Li,Yuan-Pei Lan
In this work, various new-observed structured CeCO 3 OH were synthesized by a self-assembly hydrothermal method , and a novel tactic to produce CeO 2- x with excellent photocatalytic activity by decomposing CeCO 3 OH in H 2 was proposed and identified. By controlling the synthetic conditions, almond-like, subglobose shape and hollow-sphere of CeCO 3 OH, 3D-broom-like of Ce 2 O 3 · 2CO 2 · nH 2 O (n = (1–2)), and sheet-like of Ce 2 (CO 3 ) 3 · 6H 2 O were synthesized. The crystal growth and formation of the cerium carbonate compounds were carefully studied using XRD , SEM and TEM. TG, thermodynamic calculation and in-situ XRD were employed to reveal the decomposition behavior of almond-like CeCO 3 OH in air, Ar and H 2 . The results show that the decomposition temperatures of CeCO 3 OH in Ar and H 2 are higher than that of in air, and suggest that Ce 2 O 3 has a low thermodynamic stability during the decomposition of CeCO 3 OH in Ar and H 2 , and Ce 3+ will be mostly oxidized by H 2 O firstly and then by both of H 2 O and CO 2 . The ceria samples obtained by decomposing from CeCO 3 OH in different atmosphere maintain indistinguishable shape and particle size. The XPS , Raman spectra and ESR results indicate that the one obtained in H 2 has the richest surface oxygen vacancies (OVs), narrowest band gap of 3.12 eV, lowest intensity in PL spectra and a significantly enhanced photodegradation ratio of methylene blue. The MB photodegradation ratio after 120 min reaction with the catalysts of CeO 2 -Air, CeO 2 -Ar and CeO 2 -H 2 is 43.14%, 54.43% and 73.41%, with a calculated reaction rate constant of 0.00539, 0.00652 and 0.01097 min -1 , respectively. The offered novel tactic of decomposing CeCO 3 OH in H 2 is an efficient and facile technique for active CeO 2- x production.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2025
·
IF 6
Yunyun Li,Yuwei Zhang,Yihao Du,Yantu Zhang
Background Volatile organic compounds (VOCs) represent a major environmental concern due to their detrimental effects on atmospheric quality and public health. In response to this challenge, cataluminescence (CTL)-based sensing has emerged as a powerful analytical technique. This research focuses on engineering advanced CTL sensors through nanomaterial innovation, specifically the development of cerium oxide-based nanocomposites for enhanced VOC monitoring. The exceptional catalytic properties and rare-earth electronic effects of CeO 2 make it an ideal candidate for improving sensor performance. The work addresses a critical need for efficient VOC sensors by leveraging nanomaterial engineering to enhance CTL-based sensing platforms. Results The CeO 2 /M x O y nanocomposites (including CeO 2 /ZnO and CeO 2 /Sm 2 O 3 ) were successfully synthesized via a facile solvothermal method and systematically characterized using PXRD, FT-IR, SEM, and XPS. The CeO 2 incorporation significantly enhanced CTL responses compared to pure M x O y , due to cerium's exceptional catalytic activity and enhanced electron transfer. The optimized CeO 2 /ZnO system (λ = 440 nm, 300 °C, 270 mL min −1 ) demonstrated excellent linear response to diethyl ether with a remarkable detection limit of 6.29 × 10 −5 mol L −1 , while CeO 2 /Sm 2 O 3 (λ = 490 nm, 320 °C, 360 mL min −1 ) showed comparable performance for acetone detection. Both systems exhibited outstanding selectivity against over ten common VOC interferents and maintained stable responses through 11 operational cycles. Spike-recovery tests yielded satisfactory results (93–106 % recovery) with good precision (RSD 4.3–6.2 %), confirming the method's potential for environmental monitoring. Significance This study develops an innovative solvothermal approach for synthesizing CeO 2 /M x O y nanocomposites, significantly advancing CTL-based VOC detection through simultaneous improvements in selectivity, sensitivity, and operational stability. The established methodology offers a scalable platform for developing advanced gas sensors for environmental monitoring and industrial safety. By overcoming critical challenges in VOC sensing, this research facilitates the translation of CTL technology from laboratory research to practical air quality management.
研究领域:
环境科学
·
纳米技术
·
分析化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Huiao Liu,Yan Li,Ziying Hu,Xinhui Hao,Hongpeng Jia,Jing Chen,Can-Zhong Lu
A wire like CeO 2 catalyst (CeO 2 -w) was obtained after the calcination of the precursor at 400 °C, which was prepared by the freeze-drying method for the first time. It shows good performance for catalytic oxidation of toluene with T 90 of 220 °C, which is much better than the CeO 2 catalysts with other structures prepared by the different methods. The good performance of CeO 2 -w is due to the bigger pore volume, more active oxygen species, more oxygen vacancies, better low temperature reducibility, higher surface area normalized reaction rates and lower E a value. Additionally, the CeO 2 -w catalyst exhibits good water resistance and catalyst stability. In situ DRIFTS indicates the catalytic oxidation of toluene on CeO 2 -w undergoes the progress of toluene → benzaldehyde → benzoic acid → maleic acid → CO 2 and H 2 O. This work affords a new idea to prepare high active CeO 2 nanowire catalysts for catalytic oxidation of toluene, and open an efficient way for the construction of CeO 2 based composite catalysts for VOCs degradation.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）