JOURNAL OF RARE EARTHS
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2020
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IF 3.104
Weili Li,Qi Wang,Lei Wang,Xian-Zhu Fu,Jing-Li Luo
The development of direct methanol fuel cells (DMFCs) is partially limited by the poor kinetics of methanol oxidation reaction (MOR) at the anode side. It was reported that the interaction between Pt and CeO 2 enhances the electrocatalytic performance of Pt catalyst for MOR. In this work, a hybrid material (CeO 2 –C) composed of CeO 2 and carbon was successfully prepared by a simple hydrothermal method followed by calcination in inert atmosphere . The hierarchically porous nanostructure and especially good electronic conductivity of CeO 2 –C make it an excellent support for Pt particles for application in electrocatalytic process. TEM investigation reveals that triple-phase interface of Pt, carbon and CeO 2 forms in Pt/CeO 2 –C catalyst. Performance of the as-prepared catalyst for MOR was studied in alkaline medium. The Pt/CeO 2 –C catalyst shows superior catalytic performance for MOR compared with Pt/CeO 2 and the physical mixture of Pt/CeO 2 and acetylene black (Pt/CeO 2 +C). The significantly improved performance can be attributed to the synergetic effect between Pt particles and CeO 2 –C support, and the better conductivity of CeO 2 –C. This study provides a possible method to expand the application potential of CeO 2 materials in MOR, and may also be used in other electrocatalytic process.
研究领域:
材料科学
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电化学
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能源科学
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产品关联
DOI
高影响因子
Journal of Energy Chemistry
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2020
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IF 7.216
Shuangxi Lin,Ziwen Hao,Jindong Shen,Xiao Chang,Shouying Huang,Maoshuai Li,Xinbin Ma
The metal-support interaction is of critical importance to enhance the catalytic activity and selectivity. However, it is still challenging to construct an appropriate interaction starting from the catalyst fabrication and/or activation. We herein established low-temperature treatment of Ni 2+ ions impregnated on ceria in reductive atmosphere and reduction–oxidation cycles as effective approachs to regulate the metal-support interaction and raise the catalytic performance in the CO 2 methanation. The proposed construction approach yielded Ni/CeO 2 that displayed highly dispersed Ni nanoparticles in contact with CeO 2 (111) and (100) facet, higher density of surface oxygen vacancies and larger amounts of weak basic sites relative to the reference samples, which increased the capacity for H 2 and CO 2 adsorption/activation. The interaction resulted in appreciably (2–3 fold) higher activity in the CO 2 methanation with maintaining almost full selectivity to CH 4 and high stability. Coverage of Ni surface by CeO 2− x thin layer as a typical structure of strong metal-support interaction resulting from high-temperature reduction, can be alleviated via reduction–oxidation cycles. We also demonstrate the activation treatment-determined metal-support interaction effect can generally extend to (TiO 2 and ZrO 2 ) supported Ni catalysts.
研究领域:
催化化学
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材料科学
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产品关联
DOI
高影响因子
RSC Advances
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2016
·Vol. 6
·期 102
·100427-100436
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IF 3.289
Binbin Ding,Yuming Zhou,Man He,Tingyuan Huang,Shiwei Li,Shuang Huang,Wenlu Pan
We report uniform hollow CeO2/Au/C nanocatalysts with hierarchical structures fabricated successfully via an etching process. The whole preparation method involves the synthesis of SiO2 spheres, a sequential deposition of CeO2, Au NPs of 2–5 nm and then C layers through hydrothermal processes, crystallization of C by calcination and finally etching of the inner silica spheres to construct the hollow structures. The as-obtained nanostructures are characterized by transmission electron microscope (TEM), scanning electron microscope (SEM), X-ray diffraction (XRD), UV-Vis spectroscopy and energy dispersion X-ray spectroscopy (EDX). The CeO2/Au/C composite shows a multilayer structure including the hollow ceria spheres and the C layers, where Au NPs are located between the two layers. In this work, the reduction of 4-NP is employed as a model reaction to test the catalytic performance. The results indicate that the hollow CeO2/Au/C nanospheres exhibit a higher catalytic performance, comparing with the hollow CeO2/Au and Au/C nanospheres. The presences of the C shells and CeO2 layers can improve the catalytic activity. In addition, the hollow CeO2/Au/C structures can be easily recycled without an obvious decrease of the catalytic activities in the reaction.
研究领域:
材料科学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
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2019
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IF 6.97
Kirill A. Alferov,Zhongwei Fu,Shuxian Ye,Dongmei Han,Shuanjin Wang,Min Xiao,Yuezhong Meng
A new one-pot synthesis method of dimethyl hexane-1,6-diyldicarbamate (HDC), a potential intermediate compound in the synthesis of polyurethanes, from CO2, methanol, and 1,6-hexanediamine (HDA) is disclosed. The starting materials are renewable, stable, easily available, and cheap. The process was implemented in 1-methyl-2-pyrrolidinone (NMP) solvent over CeO2 catalysts. Three different CeO2 catalysts (commercial nanospheres, CeO2(c) obtained by direct calcination of (NH4)2Ce(NO3)6, and CeO2 nanorods) were tested in this reaction and their micromorphology and physical–chemical properties were characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), and N2 adsorption. CeO2 nanorods proved to be the most active catalytic material. The influence of different parameters on reaction outcome was studied. The yield of HDC was about 80% under optimized reaction conditions. Experiments for better understanding of reaction mechanism were also performed.
研究领域:
化学工程
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催化
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材料科学
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有机化学
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可持续化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
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2022
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IF 6.14
Haiyan Ruan,Shaofang Zhang,Hongguang Wang,Jiahui Pei,Ruoli Zhao,Xiaoyu Mu,Hao Wang,Xiaodong Zhang
The construction of nanozymes at the atomic level that hold structural stability and high enzyme-like activity is now a key factor in the optimization of an artificial enzyme. Single-atom metal/cerium oxide (CeO2)-based nanozymes have been demonstrated to possess a variety of enzymatic activities and radical scavenging abilities, which are mainly attributed to the single-atom active site, redox valence states, and abundant defect chemistry. Here, we developed a single-atom Pd/CeO2 nanostructure by aqueous phase synthesis that exhibits the advantages of high yield and good stability. The Pd/CeO2 nanostructure possesses peroxidase (POD), superoxide dismutase (SOD), and catalase (CAT) activities as well as reactive nitrogen species free-radical scavenging activity, exhibiting multienzyme-like activities and stability compared with CeO2 and other metal-based nanozymes. It is worth mentioning that the Pd/CeO2 nanostructure exhibits high POD-mimicking activity with a reaction rate of 0.88 μM/min, about 5 times higher than that of the CeO2 nanozyme. In addition, the CAT-like activity of the Pd/CeO2 nanostructure is excellent, and its scavenging rate of hydrogen peroxide reached nearly 100% at a concentration of 50 ng/μL. The present work shows that single-atom Pd substitution is a promising strategy for the design of CeO2 nanozymes to exert better effects on biomedical applications, especially with diseases related to oxidative stress.
研究领域:
纳米技术
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生物化学
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材料科学
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生物医学工程
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产品关联
DOI
高影响因子
Nanoscale
·
2021
·Vol. 13
·期 5
·3227-3236
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IF 7.79
Yinqing Sun,Yi Guan,Xiaochao Wu,Wanqing Li,Yongliang Li,Lingna Sun,Hongwei Mi,Qianling Zhang,Chuanxin He,Xiangzhong Ren
The rational design and construction of the efficient and robust non-noble metal bifunctional oxygen electrocatalysts is of critical significance due to the attention given to reversible metal–air batteries. In this paper, we report novel two-dimensional “senbei”-like Co9S8/CeO2/Co-NC nitrogen-doped carbon nanosheets (Co9S8/CeO2/Co-NC) derived from a unique 2D Co/Ce bimetallic ZIF. The phase transition from 3D spherical Co-ZIF to 2D Co/Ce-ZIF was achieved through the introduction of Ce ions. Profiting from the successful construction of the unique Co9S8/CeO2 heterostructure and the synergetic effect of two components, the as-prepared Co9S8/CeO2/Co-NC exhibited excellent electro-performance in both the oxygen evolution reaction (Ej=10 = 1.60 V) and oxygen reduction reaction (E1/2 = 0.875 V). Furthermore, when used as a bifunctional air electrode for Zn-air batteries, Co9S8/CeO2/Co-NC reached a high peak power density of ≈164.24 mW cm−2 at a high current density of ≈351 mA cm−2 and displayed an outstanding cycling stability of more than 668 h at 5 mA cm−2. This research provides new guidelines for preparing hybrid materials from cobalt-based sulfide species and CeO2 for electrocatalysis and energy storage or other fields.
研究领域:
材料科学
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能源化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Huaiyu Dong,Shuailong Gao,Chen Yu,Zhichen Wang,Haofeng Zhang,Yixing Huang,Tian Zhao,Ying Li
Traditional microwave absorbing materials struggle to balance wideband absorption with mechanical properties, particularly in multifunctional applications. This study explores the effects of short carbon fibers (CF), cerium dioxide (CeO 2 ), and reduced graphene oxide (rGO) on the electromagnetic and mechanical properties of 3D-printed composites. The ABS@CF/CeO 2 /rGO composite with a thickness of 2.2 mm exhibited exceptional microwave absorption, achieving an effective absorption bandwidth (EAB) of 6.6 GHz and a minimum reflection loss (RL min ) of −40.9 dB. The Whale Optimization Algorithm (WOA) was employed to design a load-bearing, microwave-absorbing superstructure, which significantly improved wideband absorption. Experimental results confirmed the superstructure’s isotropy and wide-angle absorption capabilities. The calculated electromagnetic parameters were applied to evaluate the radar cross-section (RCS) of large targets, demonstrating enhanced stealth performance for unmanned aerial vehicles (UAVs). Mechanical tests revealed that rGO improved interlayer bonding strength, while CF negatively impacted bending performance. The superstructure also showed excellent mechanical stability in load-bearing tests, underscoring its potential for practical engineering applications. This study offers insights into designing advanced composite materials with balanced electromagnetic and mechanical properties, guiding future multifunctional material development.
研究领域:
材料科学
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电磁学
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机械工程
✓ 已验证
产品关联
DOI
高影响因子
POLYMER TESTING
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2021
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IF 4.282
Zhicheng Zhao,Yanjun Ma,Hongqi Wan,Yinping Ye,Lei Chen,Huidi Zhou,Jianmin Chen
CeO 2 nanoparticles prepared by the in-situ synthesis method were used to strengthen the polyamide-imide/polytetrafluoroethylene (PAI/PTFE) lubricating coatings. The crystalline phases and micro-structure of the lubricating coatings were characterized by XRD and SEM. A CSM friction machine was used to test the tribological properties of the coatings. The experimental results showed that CeO 2 nanoparticles synthesized in-situ in the PAI/PTFE coatings had good dispersion and a narrow range of particle size (about 80 nm–110nm). The addition of CeO 2 nanoparticles could effectively promote the micro-hardness and anti-wear performance of the coatings. Furthermore, the PAI/PTFE lubricating coating filled with 5 wt% CeO 2 nanoparticles exhibited superior micro-hardness and wear resistance. In practical applications, The PAI/PTFE lubricating coating filled with 5 wt% CeO 2 nanoparticles is more suitable for high max sliding velocity and low applied load.
研究领域:
材料科学
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摩擦学
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2019
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IF 4.084
Xuecheng Liu,Linxin He,Ximin Chen,Liqiong Du,Xingxing Gu,Song Wang,Ming Fu,Fan Dong,Hongyu Huang
Ceria dioxide supported on graphitic carbon nitride (CeO 2 /g-C 3 N 4 ) composites were facilely synthesized to be application for photocatalytic hydrogen (H 2 ) generation in this present work. The physical and chemical properties of CeO 2 /g-C 3 N 4 nanocomposites were determined via a series of characterizations. The CeO 2 /g-C 3 N 4 composites prepared by facile thermal annealing and rotation-evaporation method exhibit excellent photocatalytic H 2 evolution with visible-light illumination. The best hydrogen generation rate of CeO 2 /g-C 3 N 4 composite with 1.5 wt% Pt is 0.83 mmol h −1 g −1 , which is almost same as that of composite with 3 wt% Pt prepared by simple physical mixing method. The significantly developed photocatalytic activity of CeO 2 /g-C 3 N 4 composite is majorly ascribed to the stronger interfacial effects with the more visible-light absorbance and faster electron transfer . This work reveals that construction of the CeO 2 /g-C 3 N 4 composite with high disperse and close knit by the facile thermal annealing and rotation-evaporation method could be an effective method to achieve excellent photocatalytic hydrogen evolution performance.
研究领域:
材料科学
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能源化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
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2021
·
IF 9.229
Weimo Li,Lusi Zhao,Ce Wang,Xiaofeng Lu,Wei Chen
The development of highly efficient and cheap electrocatalysts for the oxygen evolution reaction (OER) is highly desirable in typical water-splitting electrolyzers to achieve renewable energy production, yet it still remains a huge challenge. Herein, we have presented a simple procedure to construct a new nanofibrous hybrid structure with the interface connecting the surface of CeO2 and CoO as a high-performance electrocatalyst toward the OER through an electrospinning–calcination–reduction process. The resultant CeO2–CoO nanofibers exhibit excellent electrocatalytic properties with a small overpotential of 296 mV at 10 mA cm–2 for the OER, which is superior to many previously reported nonprecious metal-based and commercial RuO2 catalysts. Furthermore, the prepared CeO2–CoO nanofibers display remarkable long-term stability, which can be maintained for 130 h with nearly no attenuation of OER activity in an alkaline electrolyte. A combined experimental and theoretical investigation reveals that the excellent OER properties of CeO2-CoO nanofibers are due to the unique interfacial architecture between CeO2 and CoO, where abundant oxygen vacancies can be generated due to the incomplete matching of atomic positions of two parts, leading to the formation of many low-coordinated Co sites with high OER catalytic activity. This research provides a practical and promising opportunity for the application of heterostructured nonprecious metal oxide catalysts for high-efficiency electrochemical water oxidation.
研究领域:
材料科学
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能源化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CATALYSIS LETTERS
·
2024
·
IF 2.3
Ren Zongli,Zhao Zhongwei,Ma Xin,Zhang Weiwei
Construction of multi-interface contact step-scheme (S-scheme) photocatalyst is a promising pathway to achieve high-electron transfer efficiency for photodegradation estrone and congo red. In this paper, g-C 3 N 4 is chosen as the main photocatalyst, CeO 2 nanosheet with the unique Ce 4+ → Ce 3+ conversion performance and Fe 3 O 4 -Reduced graphene oxide are loaded onto the g-C 3 N 4 surface to bulid 2D-2D magnetic photocatalyst. The 2D–2D magnetic photocatalyst structure imparts reusability by magnetic retrieval and at the same time Fe 3 O 4 -Reduced graphene oxide acts as an efficient host for g-C 3 N 4 /CeO 2 composite photocatalyst. The photocatalytic performance is examined using etsrone and congo red. Photodegradation studies show the CeO 2 /g-C 3 N 4 / Fe 3 O 4 - Reduced graphene oxide a composite catalyst can degrade 71% of estrone, 92% of congo red and 89% phenanthrene, Free radical scavenger test shows superoxide and hydroxyl radical species play a major role in the degradation. Furthermore, it is demonstrated that the magnetic CeO 2 /g-C 3 N 4 / Fe 3 O 4 -Reduced graphene oxide possesses strong antibacterial properties against Proteus mirabilis and Escherichia coli. A three-factor-three-level Box–Behnken design (BBD) was selected to optimize three greatly influential parameters: light irradiation time (min), The quality of photocatalyst(mg) and pollution concentration(ppm) by response surface methodology. It is expected that CeO 2 /g-C 3 N 4 / Fe 3 O 4 - Reduced graphene oxide can be used as a 2D–2D magnetic photocatalyst for to achieve its valorization, which have very broad development prospects in the field of environmental remediation or catalysis. Graphical Abstract
研究领域:
环境科学
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材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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2022
·
IF 6.76
Jie Huang,Xuhua Ye,Wenjun Li,Anqi Shi,Xini Chu,Ziwen Cao,Chao Yao,Xiazhang Li
Developing low cost and efficient strategy to eliminate volatile organic compounds (VOCs) are quite urgent and challenging. Herein, CeO 2 nanoparticles co-doped with Yb 3+ and Er 3+ were immobilized on attapulgite clay (ATP) for photothermal catalytic oxidation of toluene. The CeO 2 :Yb 3+ , Er 3+ /ATP exhibited outstanding catalytic activity with low T 90 of 295 °C (temperature at 90% degradation), satisfactory stability and highly water resistance. The enhanced photothermal catalytic performance can be attributed to the optimal introduction of Yb 3+ and Er 3+ , which promoted the up-conversion of near-infrared light (NIR) to visible light increasing the light utilization. The defects caused by Yb 3+ /Er 3+ doping facilitated the adsorption of O 2 , while the active oxygen species generated from the defects and the photoinduced reactive species not only favored the oxidation of toluene in photothermal catalytic process, but also accelerated the reoxidation of reduced catalyst. Notably ATP support provided large specific surface area and abundant adsorption sites for toluene molecules to promote the deep oxidation and hindered the deactivation of catalysts caused by the accumulation of intermediates. In-situ DRIFTS test revealed that the alkoxide and benzoate appeared as the main intermediates, which can be deeply oxidized under light irradiation. Current work provides a new alternative for photothermal catalytic degradation of VOCs.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）