JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2024
·
IF 2.6
Xiao Mi,Hui Xinyu,Yang Songyi,Du Xinyue,Gao Xiaofan,Song Zhuoyuan,Zhang Weixi,Xiao Meng
Supercapacitor (SC) electrodes with excellent capacity and multiplicity performance have been in demand for a long time. In this paper, CeO 2 /Co 3 O 4 nanorod arrays were firstly synthesized by hydrothermal method and thermal treatments, and then NiCo 2 S 4 were successfully wrapped around CeO 2 /Co 3 O 4 nanorod arrays by electrodeposition. On the one hand, the CeO 2 /Co 3 O 4 nanorod arrays acted as a core layer to provide a scaffold for the continuous and stable conductivity of the electrochemical reaction, while on the other hand, the NiCo 2 S 4 played an important role in increasing the capacity due to their high conductivity. The electrochemical properties of NiCo 2 S 4 @ CeO 2 /Co 3 O 4 electrode materials were remarkable improvement due to the synergistic and complementary effect. The area capacitance of the prepared NiCo 2 S 4 @ CeO 2 /Co 3 O 4 nanorod arrays was 1576.67 mF cm −2 with a current density of 1 mA cm −2 . And the intrinsic and transfer resistances of the composites were 0.816 Ω and 0.064 Ω. Meanwhile, the asymmetrical supercapacitors exhibited excellent energy density (0.074 mWh cm −2 ) with the power density of 0.805 mW cm −2 . The capacitive retention rate after 5000 cycles was 93.25%. This study demonstrates that the 3D core–shell structure of NiCo 2 S 4 @ CeO 2 /Co 3 O 4 nanorod arrays has a good practical application potential in supercapacitor devices.
研究领域:
材料科学
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电化学
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纳米技术
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
Journal of Cleaner Production
·
2020
·
IF 7.246
Chengcheng Shi,Dachao Yuan,Luping Ma,Guangsheng Fu,Shufang Wang,Yaguang Li
Sunlight-driven toluene elimination system faces the problems of low reaction rate, secondary pollution, and especially tricky to large-scale production. In this work, we used a PVP assisted spray drying method to synthesize Cu doped CeO 2 microspheres with the merits of zero waste water and solids discharge, kilogram level yield, uniform dispersion of Cu, and high toluene combustion activity. Further, a new photothermal device was constructed to heat catalysts to 295 °C under one standard sunlight irradiation. As a result, the new photothermal device supported Cu doped CeO 2 microspheres showed a full oxidation of toluene at the rate of 59.82 mmol g −1 h −1 under 1 sun irradiation, 150 times higher than the advanced sunlight-driven toluene elimination. An industrial demonstration of this new system was developed, and this system was able to completely deal with 22.2 m 3 h −1 of exhaust with the toluene concentration of 1–10,000 ppm under 1 m 2 of outdoor sunlight irradiation in the daytime of winter, showing the potential on industrial applications.
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
RSC Advances
·
2016
·Vol. 6
·期 53
·47966-47973
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IF 3.289
Yao Shi,Xiaoliang Zhang,Yongmei Zhu,Hongliang Tan,Xiangshu Chen,Zhang-Hui Lu
Ag–CeO2 nanocomposites (Ag@CeO2 NCs) with a core–shell structure have been successfully synthesized through the combination of a redox reaction and the reverse micelle technique without any additional reductants or surfactants. Under a N2 atmosphere, the redox reaction automatically occurs between Ag+ and Ce3+ in an alkaline solution, resulting in the formation of Ag@CeO2 NCs by the self-assembly process. By using the XRD, FE-SEM, TEM, XPS, and ICP methods, the characterized results of Ag@CeO2 NCs show that Ag nanoparticles (NPs) with a diameter of 3–7 nm are surrounded by CeO2 NPs. Compared to CeO2 supported Ag NPs, free Ag NPs, and CeO2, the as-synthesized Ag@CeO2 NCs exhibit a superior catalytic activity and high sustainability for the hydrogenation of 4-nitrophenol (C6H5NO3, 4-NP) and 2-nitroaniline (C6H6N2O2, 2-NA) with sodium borohydride (NaBH4) in water solution at room temperature. The Ag@CeO2 NCs can achieve a complete reduction of 4-NP and 2-NA with turnover frequencies (TOF) of 138.7 and 109.8 h−1, respectively. The durability tests show that the Ag@CeO2 NCs are still highly active for the reduction of 4-NP and 2-NA, preserving 98% and 95% of their initial catalytic activity even after ten runs.
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
PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION
·
2015
·Vol. 32
·期 6
·652-660
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IF 3.081
Zhi-Gang Wang,Wen-Zhi Bi,Shu-Cui Ma,Nan Lv,Ji-Lin Zhang,De-Hui Sun,Jia-Zuan Ni
CeO 2 nanocrystals (CN) with different morphologies (i.e., cube, octahedron, and rod) are prepared and the facet-dependent effect of these CeO 2 nanocrystals on the adsorption and dephosphorylation of phosphorylated molecules is investigated for the first time using the model p-nitrophenyl disodium orthophorphate (p-NPP). Due to their different surface atomic configurations, the {111} and {110} facets have much higher adsorption capacity and kinetic catalytic activities than {100} facets. All the CeO 2 nanocrystals can intensely promote the dephosphorylation reaction owing to the strong interaction between Ce cations and phosphoryl oxygens resulting in the cleavage of phosphoester bonds. As was expected, the above facet-dependent effect can be verified by the practical application results of the CeO 2 nanocrystals on the capture and dephosphorylation of phosphopeptides. Thus, surface engineering could be a useful and feasible strategy for not only fundamentally understanding the interaction between crystal facets and molecules but also effectively developing high-performance functional materials.
研究领域:
材料科学
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生物化学
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2022
·Vol. 27
·期 15
·4863
·
IF 4.927
Shun Li,Zuquan Zheng,Zhicheng Zhao,Youling Wang,Yao Yao,Yong Liu,Jianming Zhang,Zuotai Zhang
CeO2nanoparticle-loaded MnO2nanoflowers, prepared by a hydrothermal method followed by an adsorption-calcination technique, were utilized for selective catalytic reduction (SCR) of NOxwith NH3at low temperatures. The effects of Ce/Mn ratio and thermal calcination temperature on the NH3–SCR activity of the CeO2-MnO2nanocomposites were studied comprehensively. The as-prepared CeO2-MnO2catalysts show high NOxreduction efficiency in the temperature range of 150–300 °C, with a complete NOxconversion at 200 °C for the optimal sample. The excellent NH3–SCR performance could be ascribed to high surface area, intimate contact, and strong synergistic interaction between CeO2nanoparticles and MnO2nanoflowers of the well-designed composite catalyst. The in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTs) characterizations evidence that the SCR reaction on the surface of the CeO2-MnO2nanocomposites mainly follows the Langmuir–Hinshelwood (L-H) mechanism. Our work provides useful guidance for the development of composite oxide-based low temperature NH3–SCR catalysts.Keywords:Mn-Ce mixed oxide;ion-adsorption;selective catalytic reduction;NOxconversion
研究领域:
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Jiasheng Wang,Ying Zhang,Xiaonan Xu,Ming Bao
Halogenated arylamines are important intermediates for the synthesis of dyes, pesticides, herbicides, and other chemicals. One important way to prepare halogenated arylamines is catalytic hydrogenation of halogenated nitroarenes. Ni-based catalysts have been used in the hydrogenation of halogenated nitroarenes but suffer from low activity and dehalogenation side reaction. In this paper, Ni–CeO2/SiO2 heterojunction catalyst with a “raisin-bun” structure was prepared by reverse microemulsion. A built-in electric field and more oxygen vacancies were formed due to electron transfer from Ni to CeO2 as a result of their work function difference. The built-in electric field leads to the heterolytic cleavage of H2, thereby improving the hydrogenation activity. Oxygen vacancies preferentially adsorb and activate nitro groups, inhibiting the dehalogenation side reaction. Through the cooperation of built-in electric field and oxygen vacancy, synchronous enhancement of the activity and selectivity is obtained successfully. This finding provides a new view for the design of non-noble metal-based catalysts with high activity and selectivity.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Frontiers in Materials
·
2023
·
IF 3.2
Ye Chao,Li Chengui
A type II band aligned BaTiO3/CeO2 photocatalysts was constructed by a simple one-step solution synthesis method. The BaTiO3/CeO2 photocatalysts contain only cubic phase BaTiO3 and CeO2, and the particles are approximately spherical with a small amount of adhesion and agglomeration, and the average particle size is about 50 nm. Transmission electron microscopy (TEM) observation and element Mapping characterization confirmed the formation of special heterojunction between BaTiO3 and CeO2 and the presence of a large number of oxygen vacancies, which resulted in high visible optical absorption coefficient. The BaTiO3/CeO2 photocatalysts demonstrated high photocatalytic activity for the degradation of oxytetracycin hydrochloride, and the optimal drug concentration, catalyst content and pH value are 50 mg/L, 1 g/L and 7, respectively. Simultaneously, the BaTiO3/CeO2 photocatalysts were selective for degradation of aureomycin hydrochloride, doxycycline hydrochloride and tetracycline hydrochloride. Other photocatalytic experiments show that the BaTiO3/CeO2 photocatalysts have high chemical and cyclic stability, and the synergistic effect of holes, hydroxyl radicals and superoxide radicals plays an important role in the whole photocatalytic process. This simple synthesis route provides a technical reference for constructing other wide-band gap semiconductors to respond to simulated sunlight.
研究领域:
材料科学
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环境科学
·
药物化学
✓ 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
ChemNanoMat
·
2019
·Vol. 5
·期 6
·831-837
·
IF 3.431
Xiaoqing Wang,Jijian Xu,Zongxiao Wu,Mingjia Zhi,Zhanglian Hong,Fuqiang Huang
Graphical Triple threat : The ternary catalyst Co-NC-CeO 2 was synthesized via a simple ‘one-pot’ and ‘one-step’ method. This catalyst exhibited excellent ORR performance, with a half-wave potential of 817 mV (vs. RHE), a diffusion limited current density of 4.72 mA cm −2 , and a good durability (half-wave potential exhibiting a negative shift of only 17 mV after 1000 cycles), due to the synergistic effects between Co nanoparticles, the nitrogen-doped carbon (NC) layer and CeO 2 nanosheets. The oxygen reduction reaction (ORR) is the key cathode reaction in renewable-energy technologies. Developing highly efficient, low-cost, methanol-tolerant and durable ORR catalysts is highly needed. In this research, we reported a simple complexing-coprecipitation method to synthesize CeO 2 nanosheets encapsulated by a nitrogen-doped carbon (NC) layer with uniformly dispersed Co nanoparticles catalysts on the surface. In particular, the 0.5Co-NC-CeO 2 sample exhibits high ORR catalytic activity with an onset potential of 875 mV (vs. RHE), a diffusion-limited current density of 4.72 mA/cm 2 and a positive half-wave potential of 817 mV (vs RHE), while 20% Pt/C presents an onset potential of 934 mV (vs. RHE), a diffusion limited current density of 5.8 mA/cm 2 and half-wave potential of 850 mV (vs. RHE). In addition, the catalyst 0.5Co-NC-CeO 2 also possesses a robust durability, that is the half-wave potential exhibits a negative shift of only 17 mV after 1000 cycles. The enhanced ORR performance can be attributed to the synergistic effect among Co, the nitrogen-doped carbon layer and CeO 2 . The results demonstrated here have implications in designing non-Pt ORR catalysts.
研究领域:
材料科学
·
催化化学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2019
·
IF 5.107
Yalei Ding,Huijie Bao,Ruyi Qian,Tongdong Shen,Shaoping Tong
The treatment of acidic wastewaters from chemical industries is a difficult task for biodegradation methods to deal with due to the high toxicity and acidity of the waters. Advanced oxidation processes (AOPs) are common methods used for treating refractory wastewaters, but traditional Fenton and ozonation processes are inefficient at pH values below 2. The combination of H 2 O 2 -with ozone, termed peroxone reaction, is one potential method to solve this problem because of its high efficiency and ease operation. In this study, a composite comprised of N-doped graphene-CeO 2 (NG-Ce) was synthesized as a heterogeneous catalyst in peroxone reaction for the removal of organic pollutants in acidic solutions. X-ray diffraction analysis and Raman spectroscopy confirmed the existence of CeO 2 and graphene in the NG-Ce catalyst. X-ray photoelectron spectroscopy was performed to analyze the chemical compositions and the valence states of the elements on the surface of the catalysts. Experimental results showed that NG-Ce greatly improved the oxidative efficiency of peroxone reaction and broadened its working pH range. Although the efficiency of NG-Ce/H 2 O 2 /O 3 is decreased as the acidity of solution increases, the degradation of pollutants remained efficient at a pH as low as 0.25. Rich Ce (III) sites on the surface of NG-Ce were suggested to be responsible for the high catalytic activity of NG-Ce in peroxone reaction.
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
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2023
·
IF 6.1
Chuan Li,Xinxin Wang,Qiangqiang Zhang,Xu Tan,Yefeng Liu,Honglin Li,Hao Liu,Enzhu Hu,Xianguo Hu
This study fabricated nano-CeO 2 /biodiesel carbon soot (BCS) composites using the raw material BCS, which is the byproduct of biodiesel combustion and cerium salt and used as a novel lubricant additive to PAO6 for steel/steel contact. Oleylamine modified nano-CeO 2 /BCS composites comprise abundant lipophilic groups, and thus nano-CeO 2 /BCS composites exhibit good dispersion in PAO6. The tribological results showed that nano-CeO 2 /BCS composites significantly improved the lubricating performances of PAO6. In case of 0.1 wt% nano-CeO 2 /BCS composites dispersed in PAO6, the friction coefficient and wear volume were reduced by 17.3 and 35.2%, respectively. The improved tribological properties were attributed to the composites rolling and forming of a lubricating film on the friction surface and the presence of BCS and CeO 2 in composites exerting a synergistic lubricating effect, which simultaneously improved the tribological properties of PAO6. This discovery contributes to the conversion of BCS into valuables and promotes the high value utilization of BCS as a lubricating additive.
研究领域:
材料科学
·
摩擦学
·
能源与环境
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Zhixin Ren,Lin Yang,Xiaoxue Tang,Qing Xu,Yanan Niu,Yuguang Lv,Mingyuan Liu
AgI/CeO 2 /rGO complexes were prepared in different proportions and characterized by XRD , SEM, TEM , FT-IR, XPS, BET, PL , I-T and EIS. The photocatalytic degradation experiments of levofloxacin (LVF) under visible light (λ max =245 nm) was performed to determined the photocatalytic activity of the composites. When the concentration of simulated pollutants is 20 mg/L and the amount of application is 15 mg, the doping ratio is AgI/CeO 2 /3%-rGO, and the photocatalytic effect of the nanocomposite with pH 5 is the best. The maximum photocatalytic degradation rate of 98.02% can be achieved. The cyclic stability of the composites and the kinetics were also analyzed, and possible degradation mechanisms were also proposed. The intermediates were also detected using high performance liquid chromatography-mass spectrometry(HPLC-MS) to obtain the possible degradation process . The results show that AgI/CeO 2 /rGO composite exhibits good photocatalytic degradation performance under visible light, and the maximum photocatalytic degradation rate for treating pollutants containing LVF is 98.02%. These findings are expected to provide important theoretical and practical guidance for environmental treatment and research and development of photocatalytic materials.
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
危险品化学品经营许可证（带存储）