ENERGY & FUELS
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2024
·
IF 5.2
Zhishan Li,Xiaoyang Chen,Zhongwei Yue,Meiting Guo,San Ping Jiang
Development of fuel electrodes for reversible solid oxide cells (RSOCs) is important for achieving good performance and stability under both solid oxide fuel cell and electrolysis cell operation modes. In this work, CeO2-decorated La0.43Ca0.37Ti0.94Ni0.06O3−δ (denoted as LCTN-Ce) fuel electrodes were prepared via a simple hydrothermal route, where CeO2 is uniformly decorated onto the external surface of the LCTN-Ce electrode with in situ exsolved Ni nanoparticles (NPs) after reduction treatment. The decorated CeO2 content can be regulated by adjusting the hydrothermal treatment time and precursor solution concentration. As the decorated CeO2 content increases from 0.81 to 2.05%, the conductivity of the LCTN-Ce electrode decreases while the oxygen vacancy concentration increases, comprehensively affecting the cell power output and CO2 electrolysis activity. The electrolyte-supported cell assembled with LCTN-1.46Ce cell with a moderate CeO2 content of 1.46% shows an excellent reversible electrochemical performance and RSOC stability in 50% H2/50% CO2 at 750 °C. The hydrothermal decoration provides a facile way to modify perovskite oxides, and the LCTN-Ce with in situ exsolved Ni NPs and surface-decorated CeO2 is proved to be a potential RSOC fuel electrode material.
研究领域:
材料科学
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能源工程
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产品关联
DOI
高影响因子
NANOTECHNOLOGY
·
2022
·Vol. 33
·期 41
·415404
·
IF 3.953
Wenjuan Xiang,Yanling Li,Mengxue Wu,Jinfu Ma,Zhilin Sheng
The development of electrocatalysts for both oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) with high-activity and atability still remain great challenges for rechargeable Zn-air batteries. Herein, a new type of Co-doped Ce–N–C bifunctional electrocatalyst has been synthesized through a simple two-step method, which realizes the high dispersion of Co3O4 on the CeO2 carbon frame and stabilizes its specific surface area. Benefiting from the synergistic interaction between Co3O4 and CeO2, the conductivity of the electrocatalyst is improved and the oxygen reduction reaction/oxygen storage properties are promoted. The resultant Co3O4-CeO2@N–C catalyst shows remarkable ORR activity with the high initial potential (E0 = 0.8 V), the large limiting current density (jL = 6 mA cm−2), and a low Tafel slope (81 mV dec−1). In full cell tests, Co3O4-CeO2@NC as the oxygen electrode exhibites superior charge/discharge capacity and excellent cycle stability. The assembled Zn-air battery achieves a maximum power density of 110 mW cm−2 at a current density of 180 mA cm−2, and a high specific capacity of 780 mAh g−1 at a discharge current density of 10 mA cm−2.
研究领域:
材料科学
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电化学
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能源存储与转换
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DOI
高影响因子
RENEWABLE ENERGY
·
2021
·
IF 8.001
Yanan Wei,Xin Li,Yunlei Zhang,Yongsheng Yan,Pengwei Huo,Huiqin Wang
Wide-light absorption performance and efficient carrier separation ability are the necessary conditions for excellent photocatalytic materials. In this research, g-C 3 N 4 QDs (CN QDs) and Au nano-particles (NPs) co-modified CeO 2 /Fe 3 O 4 micro-flowers (MFs) photocatalyst (CACeF) has been prepared. CO 2 photoreduction experiments showed that the composite had obviously enhanced photoreduction activity and photocatalytic stability. The yields of CO and CH 4 over it as catalyst in 4 h is about 5 and 8 times greater than that of pure CeO 2 . Photoelectrochemical tests showed that the heterojunction between CN QDs and Au NPs can greatly improve the carrier separation ability and the light-utilization efficiency of photocatalysts. Besides, the excellent electronic transmission performance of Au NPs provided a specific channel for the electron transmission, and the strong local surface plasmon resonance (LSPR) of Au NPs resulted in a lot of hot-electrons can directly take part in the CO 2 photoreduction. The synergistic effect between CN QDs and Au NPs can further enhance the photocatalytic activity of the photocatalyst. Fe 3 O 4 QDs can ensure the effective recovery and reuse of the composite without affecting the photocatalytic performance of composite. Finally, a potential photoreduction mechanism of CN QDs and Au NPs co-modified CeO 2 /Fe 3 O 4 MFs photocatalyst were discussed in total.
研究领域:
材料科学
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环境科学
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化学工程
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产品关联
DOI
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
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电化学
·
能源存储
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DOI
高影响因子
PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION
·
2018
·Vol. 35
·期 8
·1800049
·
IF 4.384
Yun Zhu,Zezhou Yang,Lifei Song,Maoqiang Chi,Meixuan Li,Ce Wang,Xiaofeng Lu
A quick and sensitive detection of ascorbic acid (AA) is essential in the fields of biosensing and disease diagnosis. In this work, an effective approach combined with electrospinning, chemical bath deposition, and calcination process is developed to encapsulate Co 3 O 4 nanoparticle into CeO 2 nanotubes as efficient peroxidase mimics for the detection of AA. The peroxidase-like catalytic activity of the as-prepared Co 3 O 4 @CeO 2 nanotubes is much higher than that of individual Co 3 O 4 nanofibers and CeO 2 nanotubes alone due to the synergistic effect between the two components. Owing to the superior catalytic efficiency of the prepared Co 3 O 4 @CeO 2 nanotubes, a colorimetric route for the rapid and accurate detection of AA with a detection limit of 0.73 × 10 −9 m with a wide linear range from 0 to 0.8 × 10 −6 m is demonstrated. This detection limit is much better than the previous reports based on the enzyme-like catalytic systems. In addition, a good selectivity toward the detection of AA over amino acids, common ions, dopamine, and uric acid is achieved. This study offers a new approach for the fabrication of Co 3 O 4 @CeO 2 nanotubes as sensing platform toward the detection of AA, which presents promising potential applications in biosensing, environmental monitoring, and medical diagnostics.
研究领域:
生物传感
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医学诊断
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纳米材料科学
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2023
·
IF 9.9
Huihui Shi,Peixin Yang,Lu Huang,Yali Wu,Duohuan Yu,Hangfei Wu,Yunhuai Zhang,Peng Xiao
The design and manufacture of high activity and thermal stability catalysts with minimal precious metal loading is essential for deep degradation of volatile organic compounds (VOCs). In this paper, a novel single-atom Pt-CeO 2 /Co 3 O 4 catalyst with ultra-low Pt loading capacity (0.06 wt%, denoted as 0.06Pt-SA) was fabricated via one-step co-precipitation method. The 0.06Pt-SA exhibited excellent toluene degradation activity of T 90 = 169 °C, matched with the nanoparticle Pt-supported CeO 2 /Co 3 O 4 catalyst with more than six times higher Pt loading (0.41 wt%, denoted as 0.41Pt-NP). Moreover, the ultra-long durability (toluene conversion remains 99% after 120 h stability test) and excellent toluene degradation ability in a wide space speed range of 0.06Pt-SA were superior to that of 0.41Pt-NP catalyst. The excellent performance was derived from the strong metal-support interaction (SMSI) between the single atomic Pt and the carrier, which induced more Pt 0 and Ce 3+ for oxygen activation and more Co 3+ for toluene removal. The in situ diffuse reflectance infrared spectroscopy (DRIFTS) experiments confirmed that the conversion of intermediates was accelerated in the reaction process, thereby promoting the toluene degradation. Our results should inspire the exploitation of noble single-atomic modification strategy for developing the low cost and high performance VOCs catalyst.
研究领域:
催化化学
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环境科学
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材料科学
✓ 已验证
DOI
PubMed
高影响因子
RENEWABLE ENERGY
·
2021
·
IF 8.001
Shanshan Shao,Chengyue Liu,Xianliang Xiang,Xiaohua Li,Huiyan Zhang,Rui Xiao,Yixi Cai
Catalytic conversion of pyrolysis vapor from biomass was performed over CeO 2 catalysts to produce ketones. Thermogravimetric-gas chromatography/mass spectrometry (TG-GC/MS) and TG-MS were applied to understand the distribution of pyrolysis vapors from various biomass including rape straw, poplar, cypress and bagasse. The favorable biomass feedstock with high yield of ketones and other useful components were screened out for directional ketonization. The results showed that the temperature range of biomass pyrolysis was generally below 400 °C, and bagasse was a reasonable raw material for ketonization with the highest yield of ketones of 33.68% at 380 °C, since it contained the most cellulose and hemicellulose in biomass of the same quality. The activity of acetone increased at higher temperature, and secondary reaction occurred, resulting in a reduction in the overall yield of ketones. The total yield of ketones from bagasse treated for 9 h was boosted by 16.18% higher than that from nonseawater-treated biomass. By the introduction of metal ions effectively, the component of the pyrolysis vapor changed, making it easier for large molecular substances to be converted to small ones during pyrolysis. Through this research, the effective utilization of biomass could be realized.
研究领域:
能源与环境科学
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催化化学
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产品关联
DOI
高影响因子
Environmental Progress & Sustainable Energy
·
2013
·Vol. 33
·期 2
·385-389
·
IF 0.865
Wei-guo Pan,Yue Zhou,Rui-tang Guo,Wen-long Zhen,Jie-nan Hong,Hong-jian Xu,Qiang Jin,Cheng-gang Ding,Shi-yi Guo
CeO-CuO catalysts were prepared by citric acid method at different calcination temperatures. The purpose of this study is to investigate the influence of calcination temperature on the catalytic activity of CeO 2 -CuO catalyst for the selective catalytic reduction of NO with NH 3 . As can be seen from the results, Ce-Cu(450) is of the best low temperature selective catalytic reduction (SCR) activity among the three catalysts, which may be resulted from its large surface area, good redox ability, strong NH 3 adsorption capacity, and high concentration of Cu 2+ and active oxygen species on the surface. © 2013 American Institute of Chemical Engineers Environ Prog, 33: 385–389, 2014
研究领域:
环境科学
·
催化化学
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产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2023
·
IF 4.8
Yifei Li,Yucui Zhang,Huan Jiang,Mengyao Qi,Xia Zhang,Baowang Zhu,Lei Han
Although the fact that H 2 O 2 is employed in the medical, food, and chemical industries, trace detection of H 2 O 2 remains a difficult and significant problem. For the detection of H 2 O 2 residues, SERS assays based on enzyme inhibition techniques show promise. As a result, we csynthesized CeO 2 @nanogel/Au nanoparticles with dual enzyme-like capabilities to detect hydrogen peroxide in this study. CeO 2 nanozymes possess both peroxidase-like and oxidase-like activities which could oxidize colorless 3,3′,5,5′-tetramethylbenzidine to blue TMB oxide. Surprisingly, after the addition of nanogel, CeO 2 @nanogel were prepared and both of its dual enzymatic activities decreased, especially the oxidase-like enzymes almost disappeared. To better investigate the enzyme catalytic activity, Au NPs were introduced and CeO 2 @nanogel/Au nanozymes were self-assembly prepared. Based on the significantly enhancement of CeO 2 @nanogel/Au nanozymes peroxidase activity, we developed a Raman detection method for H 2 O 2 with TMB ox as the probe molecule. The Raman intensity showed good linearity for the concentration of H 2 O 2 in the range of 10 -9 M−10 −1 M with a correlation coefficient of R 2 = 0.9922 and a detection limit of 2.68 × 10 -12 M. Thus, the proposed SERS mode sensor exhibited good selectivity and interference resistance, providing a new avenue for environmental monitoring.
研究领域:
生物化学
·
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
BIOELECTROCHEMISTRY
·
2022
·
IF 5.76
Qian Liu,Huawei Shen,Baiying Li,Juan Cai,Yang Peng,Zhi Weng,Hongyan Yu,Guoming Xie,Wenli Feng
Currently, developing an effective and easy-to-operate signal amplification assay to detect the trace-amount miRNAs in serum remains a significant challenge. Herein, an ultrasensitive CeO 2 @Ag hybrid nanoflower (CeO 2 @Ag HNF)-labeled electrochemical biosensor was developed for sensing miRNA, based on a target-feedback rolling-cleavage (TFRC) signal amplifier. CeO 2 @Ag HNFs possessing a unique three-dimensional layered structure were synthesized without any complex reaction conditions, such as heating and vacuum. The bimetallic nanoflowers provided a large surface area and excellent CAT-like activity, thereby enhancing electrochemical performance. Based on the principle of branched catalytic hairpin assembly, target miRNA could continuously trigger the assembly of branched junctions with ends composed of DNAzyme. The activated DNAzyme was able to cleave the hairpin substrate efficiently and release to capture more CeO 2 @Ag HNFs label. The process combining target-driven branched catalytic hairpin assembly and DNAzyme-assisted rolling cleavage were defined as TFRC signal amplification. This sensitive electrochemical biosensor exhibited good linear relationship of 1 fM − 1 nM with a detection limit down to 0.89 fM. The proposed method is expected to have a promising application in the miRNA-associated fundamental research and clinical diagnosis.
研究领域:
生物化学
·
分子生物学
·
纳米医学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Fang Chen,Mingkun Wu,Yuzhi Xu,Jianjun Zhang,Jun Luo,Mengkui Tian
The purposeful modulation of interfacial charge transfer pathways in heterogeneous structures is an innovative and feasible strategy to improve photocatalysis efficiency. However, it is often characterized by difficulties in charge separation and transport and the high charge recombination limits its applications. Herein, a Cd 0.3 Zn 0.7 S-based heterostructure of Cd 0.3 Zn 0.7 S@Ti 3 C 2 /Ag/CeO 2 was fabricated in which the efficient electron transfer route was designed by synergistic action of Z-scheme and Schottky junction. Serial characterizations and Density-Functional Theory calculations identify the Schottky junction promoted the electrons in Cd 0.3 Zn 0.7 S to transfer to Ti 3 C 2 , whereas the Z-scheme heterojunction accelerated the electrons transfer from CeO 2 to Cd 0.3 Zn 0.7 S@Ti 3 C 2 with Ag acting as the electronic intermediary. Significantly, the optimized Cd 0.3 Zn 0.7 S@Ti 3 C 2 /Ag/CeO 2 exhibited stronger photocatalytic H 2 evolution of 16.3 mmol·g −1 ·h −1 with an apparent quantum efficiency of 29.8 % at 420 nm, which was 4.2 times higher than the pristine Cd 0.3 Zn 0.7 S material. This work offers valuable insights into realizing the desired charge transfer route through artificial heterointerface and a new possibility for applying Cd 1-x Zn x S materials in photocatalytic hydrogen production.
研究领域:
材料科学
·
光催化
·
能源转换
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Dongping Zhang,Yongdi Liu,Yanyu Song,Xianbo Sun,Wen Liu,Jun Duan,Zhengqing Cai
A Fe-doped CeO 2 was fabricated for catalytic ozonation of Amoxicillin (AMX), and the catalytic mechanisms were explored in this study. Under optimal conditions (the initial solution pH of 7.0, FC-0.3 dosage of 0.5 g/L, O 3 dosage of 4 mg/min), the AMX and TOC removal by the optimal material (FC-0.3, at Fe/Ce atomic ratio of 0.3) reached 98.1 % at 24 min and 55.2 % at 36 min, respectively. Improved the AMX mineralization efficiency by 3.7 times. The experiments and theoretical calculation reveal the mechanisms of promoted catalytic ozonation by FC-0.3: 1) Highly abundant surface-active sites (i.e., –OH) enabled the adsorption of H 2 O and O 3 , which was favorable to the generation of reactive oxygen species (ROS) and improved the reaction probability for ROS and contaminants. 2) The synergistic effect between Ce 4+ /Ce 3+ and Fe 3+ /Fe 2+ redox couples accelerated the electron transfer and formation of ROS. More than 42 % of •OH was generated in the presence of FC-0.3, and the •OH, •O 2 − and 1 O 2 were the main ROS that contributed to AMX degradation. The surface OH groups played a key role in the catalytic ozonation. The oxygen vacancies (OVs) played an important role in electron transfer, Ce and Fe were the active sites of electrons transfer following the sequence of (Ce 3+ + Fe 2+ ) → (Ce 4+ + Fe 3+ ) → (Ce 3+ + Fe 2+ ) redox reaction. The degradation pathway investigation and toxicity evaluation revealed that some more toxic intermediates were generated during the ozonation process, and sufficient mineralization is required to meet safe discharge. This study provides reference for the synthesis of new catalysts and insight into the reaction mechanisms in the heterogeneous catalytic ozonation process.
研究领域:
环境科学
·
催化材料
·
水处理技术
✓ 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）