COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2020
·
IF 3.99
Nan Wang,Wangqiang Li,Yadong Ren,Jizhou Duan,Xiaofan Zhai,Fang Guan,Lifei Wang,Baorong Hou
Developing environmental and cost-effective antifouling technologies is essential to solve serious biofouling problems. Recently, enzyme mimics and halogenating enzymes have caught progressively attention as valuable tools to combat biofilm formation. In this work, the core-shell structure of CeO 2 @C, as one effective haloperoxidase-like enzyme mimics, was successfully synthesized using the carbon sphere as template through a simple coprecipitation method. Through the UV–vis absorption spectra and kinetic measurements, the CeO 2 @C displays intrinsic haloperoxidase-like activity via catalyzing the bromination of organic signaling compounds. Meanwhile, the prepared CeO 2 @C catalyst process high catalytic stability and recyclability, corresponding to a well catalytic performance repeatability after refresh of raw substrates (at least 10 times). The antibactrial property of CeO 2 @C as haloperoxidase mimicry is evaluated by immersing titanium plate/CeO 2 @C modified titanium plates into bacterial suspensions with different conditions for 4 h at 37 °C. It can catalyze the oxidation of Br − with H 2 O 2 to the corresponding hypobromous acid (HBrO), which exhibits strong antibacterial activity against Gram-negative ( Escherichia coli ), Gram-positive ( Staphylococcus aureus ) bacteria and typical marine ( Pseudomonas aeruginosa ) bacteria. This study introduces a stable, non-poisonous and inexpensive biomimetic material for antibacterial, antifouling and disinfection applications based on novel sustainable and conservation methods.
研究领域:
生物化学
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材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Shuqiang Wang,Yanpeng Xue,Feifei Huang,Zhigang Yu,Ying Jin
Fine-tuning the surface structure of transition metal oxides at the atomic level is a promising way to improve the catalytic properties of materials . However, the influence of crystal surface structure on electrode reaction kinetics is still limited. In this study, we propose an in-situ synthesis strategy to obtain two-dimensional carbon/cerium oxide core–shell nanosheets by thermal decomposition of Ce-MOF nanosheets grown on the surface of carbon nanostructures , and fine-tuning the surface structure by introducing oxygen vacancies through defect engineering during the oxide nucleation process is conducted to obtain controllable exposed {1 1 1} and {1 1 0} surface CeO 2 @C composites. Both experiments and theoretical calculations show that the {1 1 0} -dominated nanocomplex (CeO 2 @C-350S) has better kinetic behavior and catalytic activity due to its abundant surface defects , which is manifested in higher active surface area , richer carrier concentration, and better promotion of diffusion and adsorption. In addition, CeO 2 @C-350S electrode has an extremely wide linear range and good stability in the electrochemical detection of nitrite. After 1000 times of the accelerated cycle experiments, CeO 2 @C-350S electrode still maintains 79.3 % of its initial current response, and recovers to 87.3 % after 10 min of stopping the test. The electrode stability is excellent, which is attributed to the clever carbon shell structure of the material. This synthesis strategy can be extended to other carbon-based oxide composite catalysts to improve the electrocatalytic performance and overall stability by adjusting the surface structure.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF RARE EARTHS
·
2020
·
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
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Raji Govindan,Xu-Jia Hong,Palanivel Sathishkumar,Yue-Peng Cai,Feng Long Gu
Metal-organic framework (MOF)-derived hybrids are promising electrode materials in electrochemical energy storage , owing to their high surface area that offers enormous redox sites and excellent conductivity. In this work, MOF-derived cerium oxide/carbon integrated with molybdenum disulfide (CeO 2 /C/MoS 2 ) hybrid is developed as an electrode material for supercapacitor . Remarkably, integration of CeO 2 /C with small amount of MoS 2 has considerably enhanced the electrochemical performance. Moreover, CeO 2 /C/MoS 2 hybrid exhibited both surface and diffusion-controlled mechanism towards charge storage. The CeO 2 /C/MoS 2 hybrid showed an outstanding specific capacitance (specific capacity) of 1325.67 F g −1 (397.70 C g −1 ) and excellent cyclic stability with capacitance retention of 92.8% after 1000 charging-discharging cycles, which is significantly higher than that of CeO 2 /C (727.49 F g −1 ) or else that of MoS 2 (300.33 F g −1 ) at 1 A g −1 . In addition, asymmetric supercapacitor (ASC) fabricated with CeO 2 /C/MoS 2 hybrid and activated carbon (AC) showed remarkable electrochemical performance with high specific capacitance (110.55 F g −1 ), excellent cyclic stability (even after 1000 cycles) and high energy density of 34.55 Wh kg −1 at a power density of 666.7 W kg −1 . Thus, MOF derived CeO 2 /C integrated MoS 2 hybrid is a potential electrode material for the ASCs.
研究领域:
材料科学
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电化学能源存储
✓ 已验证
DOI
高影响因子
KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2023
·Vol. 40
·期 12
·3059-3067
·
IF 2.7
Yin Zihang,He Ruibo,Nie Fei,Wei Zhen,Jia Bo,Feng Qing,Fu Xiaolong,Zhang Wenyan
The oxygen evolution kinetics of industrial copper electrodeposition is slow, resulting in low electrocatalytic activity and high energy consumption. In this work, a quaternary composite of carbon coated active particles containing Mn, Co and Ce were prepared (Mn-Co 3 O 4 /CeO 2 @C), and Ti/Sb-SnO 2 /PbO 2 electrode doped with these active particles was prepared by co-electrodeposition. The microstructure and chemical composition of the electrode was characterized by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray diffractometry (XRD). Linear sweep voltammetry (LSV), electrochemical impedance spectroscopy (EIS) and Tafel polarization curve (Tafel) were used to study the electrochemical properties of anode materials. The results showed that the doping of Mn-Co 3 O 4 /CeO 2 @C active particles promoted the crystal transition of PbO 2 , decreased the average grain size, and the doping of Ce increases the average valence state of Co. The modified titanium electrode showed excellent catalytic activity of the oxygen evolution reaction (OER) characteristics. The overpotential of the doped Ti/Sb-SnO 2 /PbO 2 anode was only 453 mV when the current density was 20 mA cm −2 in 0.5 M H 2 SO 4 solution, which is 508 mV lower than that of the undoped Ti/Sb-SnO 2 /PbO 2 anode. In simulated copper electro-deposition experiments, the cell voltage was reduced by about 400 mV, compared to the undoped Ti/Sb-SnO 2 /PbO 2 electrode.
研究领域:
材料科学
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电化学工程
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2023
·
IF 7.4
Zhongchun Yuan,Tingting Cao,Min Deng,Jun Ma,Shuo Geng,Chunliang Yang,Yuan Ren,Mengqin Yao,Fei Liu,Xiaodan Wang
It is very crucial but still a huge challenge to develop efficient and durable catalysts to promote hydrogen production from formic acid (FA). Herein, three CeO 2 with structurally well-defined different shapes, i.e., sCeO 2 (spheres), rCeO 2 (rod) and oCeO 2 (octahedral), are prepared, and their effect on the crystal faces and oxygen vacancy over the constructed heterostructure catalysts (Pd-CeO 2 /C) have been intensively investigated in the FA dehydrogenation. Pd-sCeO 2 /C outperforms the other catalysts with a turnover frequency (TOF) value of 2691 h −1 and selectivity to hydrogen of 100 % at 30 °C. A synergism between the CeO 2 (1 1 0) facet and more oxygen vacancies is considered to be key to obtaining the high reactivity. Moreover, biomass carbon promotes the dispersion of Pd-CeO 2 heterostructures due to its large specific surface area and causes more defects in the Pd-CeO 2 /C. Combined with in-situ FTIR and density functional theory (DFT), it is speculated that FA is decomposed through formate pathway over the Pd-sCeO 2 /C. This work thus provides a reasonable design and controllable synthesis strategy for the effective application of FA as an available liquid phase hydrogen storage material.
研究领域:
催化
·
材料科学
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化学工程
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物理化学
✓ 已验证
产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2019
·Vol. 187
·期 1
·1-10
·
IF 5.479
Dong Wenfei,Huang Yuming
A metal organic framework obtained from cerium(III) and trimesic acid was pyrolyzed to obtain a novel nanostructure referred to as CeO 2 /C nanowires. The experimental parameters temperature, precursor and gas atmosphere were optimized. The nanowires show good dispersion and a large number of oxygen vacancies, and this leads to excellent peroxidase-like activity. The nanowires are stable at pH values between 2 and 10, and in the 4–80 °C temperature range. The peroxidase-mimicking activity was exploited in a sensitive colorimetric method for determination of H 2 O 2 by using 3,3′,5,5′-tetramethylbenzidine as the chromogenic substrate. The absorbance at 652 nm increases linearly in the 0.5 to 100 μM H 2 O 2 concentration range. If glucose oxidase is added to a solution containing glucose, H 2 O 2 will be enzymatically produced. This was exploited to design a new method for determination of glucose. The optical response is linear in the 1–100 μM glucose concentration range, and the detection limit is 0.69 μM (at S/ N = 3). The method was successfully applied to the determination of glucose in serum samples.
CeO 2 /C nanowires prepared by Ce- MOF pyrolysis show peroxidase-like activity and are able to catalyze the oxidation of tetramethylbenzidine (TMB) by H 2 O 2 . This was applied to glucose oxidase-based colorimetruc determination of glucose in human sera
研究领域:
材料科学
·
分析化学
·
生物医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 19
·10625-10637
·
IF 14.511
Kun Wang,Xiaobing Huang,Tao Zhou,Dan Sun,Haiyan Wang,Zhi Zhang
The NASICON-type Na4MnV(PO4)3 (NMVP) possesses potential as a cathode material in SIBs, and is known for its stable 3D Na+ superconductive framework, high voltage platform, and relatively low cost and toxicity. Nevertheless, the intrinsic poor electronic conductivity and Jahn–Teller effect from Mn3+ during cycling limit its further application. Herein, to address such issues, a well-designed 3D porous spheroidal Ce3+-doped NMVP@CeO2/C cathode was constructed via a simple spraying drying-assisted route. As proved, the synergistic effect of Ce3+ doping in the crystal framework and CeO2 surface coating was achieved simultaneously, which greatly improved the electronic conductivity, facilitated the ion diffusion transfer and stabilized the crystalline structure. As a result, the as-prepared sample delivered superior discharge performance (50.3 mA h g−1 at 50C) and long circular life (91.0 mA h g−1 after 2000 cycles at 5C with 86.7% capacity retention). Furthermore, the reversible biphasic reaction for cathodes was confirmed by Galvanostatic intermittent titration technique (GITT) and ex situ XRD. The DFT calculation revealed the influence of Ce3+-doping on the crystalline framework and electrochemical properties. Finally, the optimized NMVP cathode also showed great potential for practical utilization through the successful assembly of full cells.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 12
·1-8
·
IF 5.479
Hou Guorong,Yun Yanjing,Wang Minqiang,Wang Ying,Chen Hao,Zhang Longcheng,Wang Feng,Xia Qingyou,Liu Yang,Lu Zhisong,Bao Shu-Juan
A corn-like CeO 2 /C coaxial cable textured by a cerium oxide shell and a carbon core was designed to sense NO. The carbon core possesses high electrical conductivity, and the CeO 2 surface delivers excellent electrocatalytic activity. The sensor, typically operated at 0.8 V (vs. Ag/AgCl), exhibits a detection limit of 1.7 nM, which is 4-times lower than that of CeO 2 nanotubes based one (at S/ N = 3). It also displays wide linear response (up to 83 μM), a sensitivity of 0.81 μA μM −1 cm −2 , and fast response (2 s). These values are highly competitive to that of a CeO 2 tube (0.92 μA μM −1 cm −2 and 2 s). The sensor was used to quantify NO that is released by Aspergillus flavus.
Schematic representation of corn-like CeO 2 /C which can more sensitively and effectively detect NO released from A. flavus than when using CeO 2 nanotubes, benefitting from its unique coaxial cable structure.
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
ACS Sustainable Chemistry & Engineering
·
2019
·
IF 6.97
Qiang Tan,Ting Qu,Cheng-yong Shu,Yan Liu,Yuting He,Wenfang Zhai,Sheng-wu Guo,Liting Liu,Yong-ning Liu
The broad application of direct methanol fuel cells (DMFCs) is impeded by the high cost of catalysts, the unsatisfied ionic conductivity of polymer electrolyte membrane (PEM), and the methanol crossover. To address the above issues, a unique strategy based on the permeable polymer fiber membrane (PFM) and nonplatinum catalysts was presented to achieve high-performance DMFCs. In this system, the high-dispersed Pd/Co–CeO2/C and methanol-tolerance NiCo2O4 were prepared and used as anode and cathode catalysts. Besides, the PEM was substituted by an inexpensive and electrolyte permeable PFM. As fabricated PFM-based DMFC shows encouraging performance (58.6 mW·cm–2), which is 3.1 times higher than that of classical PtRu catalysts and PEM-based cell (19.1 mW·cm–2) at room temperature, and the maximum power density of PFM-based cell even could reach up to 126.2 mW·cm–2 (26.1 mW cm–2 with air-feed) at 60 °C. Furthermore, the PFM-based cell exhibits excellent stability performance in the 200 h long-time discharging test. The high electrocatalytic activity and selectivity of the catalysts, observably decreased membrane resistance of PFM, and unique structure of PFM-based membrane electrode assembly are combined to boost the performance. It provides a new strategy to achieve high-performance DMFCs and substitute for the expensive Pt catalysts and polymer-electrocatalyzed membrane.
研究领域:
材料科学
·
能源技术
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2024
·
IF 13
Yangyang Ren,Beibei Li,Guichao Zhang,Zunming Lu,Lanlan Li,Xiaojing Yang,Xinghua Zhang,Xiaofei Yu
Improvement in the durable and active low-Pt nanocatalysts for oxygen reduction reaction (ORR) is the essential target for clean energy. Herein, an efficient CeO 2 supported PtCu alloy catalyst (PtCu/CeO 2 -C) for ORR in acid media is developed. The CeO 2 support can effectively anchor the PtCu particles and inhibit their migration during the long-life cycling, which is beneficial to the catalytic performance. According to the electrochemical experiments, the specific and mass activities of PtCu/CeO 2 -C are 1.09 mA cm −2 and 0.49 A mg Pt −1 at 0.9 V, which are 9.9 and 6.1 times as large as that of Pt/C, demonstrating its outstanding ORR activities in acid media. Moreover, the theoretical studies confirm that oxygen vacancies (V O ) as Lewis acid sites can facilitate the adsorption and dissociation of O 2 , regulate the electronic structure of Pt, and thus endow PtCu/CeO 2 -C with an efficient 4-electron ORR pathway. The results suggest that the rational design of supported Pt-based catalysts is of great significance for efficient ORR reaction.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Molecular Catalysis
·
2024
·
IF 3.9
Shengya Ge,Chenzhang Li,Peiyan Bi,Wei Hong
The operation of direct ethylene glycol fuel cells (DEGFCs) to generate electric energy from ethylene glycol rely on the effective electrocatalysts for the ethylene glycol oxidation reaction (EGOR). The fabrication of EGOR electrocatalysts with high activity, high durability and high resistance for corrosion, is essential important for the DEGFCs. Herein, we report a fabrication of Pd nanoparticles immobilized by the Ce-doped ZIF-67-derived carbon (Pd-CeO 2 /ZDC). The Pd nanoparticles are generated by the in-situ reduction reaction between the H 2 PdCl 4 and the Co nanoparticles formed during the ZIF-67 pyrolysis. Owe to the porous structure and N-doping inherited from the ZIF-67, the Pd and CeO 2 nanoparticles show a uniform distribution. Due to the enhanced EGOR electrooxidation kinetic promoted by the ZIF-67-derived support, the multiple-components and structure synergies, the resultant Pd-CeO 2 /ZDC catalyst affords a EGOR current density of 32.4 mA cm -2 , which is higher than the commercial Pd/C as well as the counterpart Pd/ZDC catalyst without CeO 2 . Furthermore, the Pd-CeO 2 /ZDC catalyst also present a better EGOR durability. This work provides a strategy for the design of EGOR catalyst with multiple-components and desired structure, which may inspire the new tactics for controllable design and synthesis of other electrocatalysts for various electrocatalysis.
研究领域:
材料科学
·
电化学
·
催化科学
✓ 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）