CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Tengfei Zhang,Peng Zheng,Jiajian Gao,Zhennan Han,Fangna Gu,Wenqing Xu,Fang Wang,Tingyu Zhu,Guangwen Xu,Ziyi Zhong,Fabing Su
Redispersing bimetallic active nanoparticles in a heterogeneous catalyst can significantly improve metal utilization and catalytic performance, but it is very challenging. In this work, we report a feasible method to redisperse large bimetallic NiRu particles (30–40 nm) on the CeO 2 support into small alloyed NiRu nanoparticles (3–5 nm) in an Ar gas atmosphere (NiRu/CeO 2 -Ar). During the high-temperature treatment, Ru metal in big bimetallic NiRu particles migrated to the surface of small alloyed nanoparticles because of the metal-phase separation, forming more Ni−Ru metal interfaces. As a result, NiRu/CeO 2 -Ar showed much better catalytic performance in CO 2 methanation than the pristine catalyst (NiRu/CeO 2 ) and the catalysts treated in air, H 2 , and reactant gases, respectively. Experimental and theoretical calculation results reveal that the newly generated Ni−Ru metal interfaces are conducive to the adsorption of CO 2 and further direct dissociation into CO*, thus enhancing the catalytic performance. This work provides a reliable strategy to redisperse bimetallic NiRu nanoparticles into small ones with more intermetallic interfaces.
研究领域:
化学工程
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材料科学
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催化反应
✓ 已验证
产品关联
DOI
高影响因子
Colloid and Interface Science Communications
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2021
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IF 4.914
Xueqin Wang,Helong Xu,Xiaohang Luo,Ming Li,Man Dai,Qihui Chen,Hua Song
Herein, CeO 2 /TiO 2 heterostructures are synthesized adopt a simple and profitable sol-gel technique. The nanostructures comprised of ultrafine and well-distributed CeO 2 nanoparticles on the TiO 2 surface. The obtained catalysts were characterized via X-ray diffraction, nitrogen adsorption , Fourier-transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy , photoluminescence spectroscopy, and ultraviolet (UV)-visible spectroscopy tests. The as-prepared heterostructures exhibited a visibly enhanced photodegradation performance using phenol(38 ppm) as the model of organic pollutants . The achieved degradation efficiency was 99.1% under UV-light irradiation for 120 min and the TOC removal was 81.31% when using CeO 2 /TiO 2 as catalyst with the CeO 2 loading of 0.5%. The enhanced property was ascribed to the formation of a heterojunction after coupling CeO 2 with TiO 2 , which could capture the phenol molecules and improve the adsorption properties of the materials. Meanwhile, the heterostructures inhibited photogenic carriers recombination, thereby extending the optical response range. Furthermore, the as-prepared catalysts possessed favorable cycle performances and were reutilized for four cycles with insignificantly reduced property, the degradation rate were decreased slightly to 94.0% with a inappreciable decline in Ce and Ti leaching, suggesting it's preeminent stability and recyclability in the process of photocatalytic .
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
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2022
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IF 7.336
Ming Cheng,Zongge Li,Tongxin Xu,Yuxin Mao,Ying Zhang,Guoxin Zhang,Zifeng Yan
Synthesis of H 2 O 2 via 2e − O 2 reduction or 2e − H 2 O oxidation has been widely acknowledged as promising alteratives to the energy-intensive anthraquinone processes. Herein, we report that the 2e − O 2 reduction and 2e − H 2 O oxidation reactions, for the first time, can be efficiently promoted on CeO 2 (100) facets, while majority of previous CeO 2 materials are utilized overwhelmingly as catalyst substrates. Electrochemical measurements indicate that CeO 2 nanocubes (NCs) deliver very high H 2 O 2 selectivity of 83% and faradic efficiency of 95.3% for 2e − O 2 reduction. Its H 2 O 2 yield rate at 0.5 V (vs. RHE) reaches 632 mmol g cat −1 h −1 , which exceeds the performance of facet-unspecified CeO 2 nanodots (NDs) in this work and many noble metal- or carbon-based electrocatalysts in previous literatures. Furthermore, it also shows a high efficiency of 66% for 2e − H 2 O oxidation. When assembled into flow cell reactor, the CeO 2 NCs can obtain a total H 2 O 2 yield of 4.6 mol g cat. −1 h −1 , and manage stable faradic efficiency (> 85%) in wide voltage range. Our work may inspire further investigation of rare earth metal oxide-based materials for 2e − oxygen electrocatalysis.
研究领域:
材料科学
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电化学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2018
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IF 4.229
Xiaona Ren,Fang Hou,Fangyuan Wang,Xiangwen Zhang,Qingfa Wang
We report a CeO 2 incorporated cobalt oxide electrode with abundant nano-sized interfaces. The as-prepared heterostructures exhibit remarkable oxygen evolution reaction (OER) activity and excellent stability, surpassing the pristine cobalt oxide and the state-of-art RuO 2 . Further DFT calculations and experimental results indicate that the improved OER performance of CoO-CeO 2 heterostructures originates from the hierarchically porous structure , large surface area and high electron density around Co sites. The armouphous phase is formed during OER test due to surface Ce leaching, which can further promoted the performance of the hybrids. This work elucidates the cooperative effects and in situ transformation of CeO 2 -incorporated cobalt oxide in water oxidation , providing a valuable guideline for designing electrocatalysts .
研究领域:
材料科学
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电化学
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2021
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IF 7.46
Han Bi,Le-Xi Zhang,Yue Xing,Peng Zhang,Jing-Jing Chen,Jing Yin,Li-Jian Bie
Recently, the influence of polar facets on the gas sensing performance of metal oxides has drawn much attention, yet the facet-dependent gas sensing properties of rare earth oxides have not been reported so far. In this work, taking CeO 2 as an example, uniform single-crystalline nanopolyhedra, nanorods and nanocubes of cubic CeO 2 were selectively prepared by a hydrothermal method at different temperatures and NaOH concentrations, using Ce(NO 3 ) 3 as the cerium source. According to X-ray powder diffraction (XRD) and high-resolution transmission electron microscopy (HRTEM) analysis, these CeO 2 nanocrystals possess different exposed crystal planes: {111} and {100} for nanopolyhedra, {110} and {100} for nanorods, and {100} for nanocubes. Abundant defects were confirmed on the surface of three CeO 2 nanocrystals by X-ray photoelectron spectroscopy (XPS), electron paramagnetic resonance (EPR) and photoluminescence (PL). Notably, gas sensors based on these three CeO 2 nanocrystals exhibited distinct response values towards dimethylamine vapor in the following order: nanocubes > nanorods > nanopolyhedra, while excluding the effects of characteristic dimension and specific surface area. The response order of CeO 2 nanocrystals is primarily ascribed to the different content of surface defects and {100} polar facets instead of {111} and {110} nonpolar facets.
研究领域:
材料科学
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化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
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2019
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IF 5.155
Huiqin Wang,Jingru Guan,Jinze Li,Xin Li,Changchang Ma,Pengwei Huo,Yongsheng Yan
In this work, the ordered mesoporous CeO 2 (m-CeO 2 ) was successfully fabricated via the nanocasting pathway, through using SBA-15 as a hard template. Besides, g-C 3 N 4 /Ag/m-CeO 2 composite was successfully constructed by calcination method. Meanwhile, the obtained samples were investigated by series of test techniques. The XRD, SEM and TEM results show that the m-CeO 2 and Ag/m-CeO 2 with the ordered mesoporous trait. Besides, the EPR, Raman and XPS results suggest that the oxygen vacancies (O v ) and Ce 3+ and Ce 4+ are in g-C 3 N 4 /Ag/m-CeO 2 . In addition, the ordered mesostructure is favorable for the CO 2 molecular movement and adsorption/desorption reaction. The g-C 3 N 4 nanosheets, a promising material possessing suitable conductor band, large specific area, non-toxicity, and outstanding chemical stability, is a candidate semiconductor for CO 2 conversion. The introduction of g-C 3 N 4 nanosheets to Ag/m-CeO 2 overcomes the photocorrosion of Ag nanoparticles and Ag facilitate the transfer of photogenerated electrons. The photocatalytic activity results show that when the loading of Ag is 7 wt%, the g-C 3 N 4 /7Ag/m-CeO 2 composite exhibits the superiority activity for CO 2 photoconversion to CO (13.94 μmol/g) and CH 4 (7.39 μmol/g) under UV-irradiation in 10 h.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2023
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IF 4.2
Xuqian Wang,Wendan Zheng,Wenhua Tong,Aimin Zhang,Yongkui Zhang,Yabo Wang
Organophosphorus esters (OPEs) are important chemicals functioning as extractants, plasticizers, flame retardants, solvents, additives, etc., and are also recognized as hazardous organic liquids generated from industrial processes. Herein, we developed a CeO2-catalyzed degradation with simultaneous phosphorus immobilization technology to treat typical OPE solvents. Under the investigated reaction conditions of a temperature of 180 °C, a reaction time of 3 h, and a dosage of ball-milled CeO2 of 19.8 g mL–1 of the OPE, the model pollutant of tributyl phosphate (TBP) was efficiently degraded with phosphorus immobilization efficiency near 100%. Meanwhile, the mineralization efficiency of TBP was also as high as 98%, which was reflected by the chemical oxygen demand change of liquid products. Gaseous products generated from CeO2-catalyzed TBP degradation could also fulfill the requirements of an environmental standard. Further mechanism studies indicated that the surface oxygen vacancy in CeO2 induced the in situ formation of superoxide radicals, which dominated TBP degradation. During catalytic degradation, the P-containing species were mainly immobilized as cerium phosphate, while the hydrocarbon chains of TBP were degraded into small molecules and finally mineralized into inorganic species. The developed CeO2-catalyzed OPE degradation approach was also applicable to aromatic and halogenated OPEs, i.e., tricresyl phosphate and tris(2-chloroethyl) phosphate. This study provided a possible alternative for waste treatment of the waste of OPEs with low environmental risks.
研究领域:
环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
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2024
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IF 5.3
Hui Liu,Xuan Lu,Pengcheng Shen,Jianwei Zhao,Limin Liang,Yue Shang,Qiuyan Hao,Ying Li
Developing nonprecious metal-based bifunctional electrocatalysts toward both the oxygen evolution reaction (OER) and the hydrogen evolution reaction (HER) with low cost, high efficiency, and long-term stability is of great significance for alkaline electrolytic water splitting. In this work, a CeO2/(NiFe)3Se4 heterostructure is prepared by chemical deposition on the surface of (NiFe)3Se4 nanoarrays grown on nickel–iron foam (CeO2/(NiFe)3Se4/NIFs). The CeO2/(NiFe)3Se4/NIFs electrocatalysts exhibit a low OER overpotential of only 140 mV at 10 mA cm–2 and a high stability of 300 h at 230 mA cm–2, while an HER overpotential of 74 mV at 10 mA cm–2 is obtained. In addition, the CeO2/(NiFe)3Se4/NIF||CeO2/(NiFe)3Se4/NIF bipolar electrolytic cell needs only a voltage of 1.493 V at 10 mA cm–2, which is comparable to that of commercial Pt/C/NIF||IrO2/NIF bipolar electrolytic cells and superior to that of (NiFe)3Se4/NIF||(NiFe)3Se4/NIF bipolar electrolytic cells (1.55 V). The excellent electrocatalytic activity stems from the special electron transfer mechanism formed by Ce4+/Ce3+ that facilitates the charge transfer process. This work provides an effective surface engineering strategy to design high-efficiency bifunctional electrocatalysts for producing clean hydrogen.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
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2020
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IF 6.182
Min Zhang,Jiacheng Yao,Muhammad Arif,Bo Qiu,Hongfei Yin,Xiaoheng Liu,Shen-ming Chen
The electronic transmission mode can effectively influence the photogenerated electron-hole separation efficiency, which further influence the photocatalytic hydrogen production performance. Herein, we synthesized a CeO 2 /ZnIn 2 S 4 composite photocatalyst having a 0D/2D heterojunction by facile solvothermal and room temperature precipitation methods. The successful construction of the heterojunction was demonstrated by XRD and XPS. Meanwhile, the interesting findings shows that the 0D “chess” CeO 2 compounded on the 2D “checkerboard” ZnIn 2 S 4 in SEM and TEM. The ESR test of O 2 − and OH demonstrates the photocatalytic mechanism of Z-scheme electron transport in the catalyst. The highest hydrogen production rate of the catalyst reaches 847.42 μmol·g −1 ·h −1 . This work provides a simple and effective strategy to achieve a rationally design photocatalyst for efficient, stable and cost-effective solar hydrogen production applications.
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
ACS Catalysis
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2025
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IF 13.1
Zhenwen Yang,Ziyi Shui,Mengfei Zhao,Zheng Wei,Fenglian Zhang,Xiaoxiao Duan,Ben Niu,Bingzhi Li,Guoxia Jiang,Zhengping Hao
Catalytic NH3 decomposition has drawn growing interest in constructing the NH3-based hydrogen economy. Ni catalysts show great potential in this reaction but suffer from low atom utilization efficiency and unclear structure–activity relationship. Here, atomic layer deposition was used to grow Ni clusters on CeO2 nanorods to create a highly active catalyst for NH3 decomposition, which outperforms the conventional Ni nanoparticle catalysts and the synthesized Ni single-atom catalyst. The distinct catalytic behaviors of Ni clusters and Ni single atoms were systematically investigated. It is revealed that the interfacial confinement effect induces a strong electronic interaction between Ni clusters and CeO2, wherein abundant Ov-Ce3+ sites are formed in the vicinity of Ni clusters, resulting in interfacial electron-enriched Niδ− sites. These Niδ− sites bind to N adatoms moderately, favoring N–H bond cleavage and nitrogen desorption (the rate-determining step), which is the origin of the high activity. In contrast, ionic Ni single atoms diffusing into the CeO2 lattice display a much lower activity since strongly bound N adatoms block the active sites and retard the overall rate. This work provides a deep understanding of Ni-catalyzed NH3 decomposition and paves the way for designing high-performance metal catalysts for other structure-sensitive reactions.
研究领域:
催化化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
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IF 4.9
Lanlan Zhang,Qi Wang,Yuhong He,Shihao Han,Xiaolu Wang,Yangfang Liao,Qingping Dai,Bing Lv,Wenzhong Wang
In this study, we present a promising CeO 2 /AgInS 2 heterostructure photoanode for photoelectrochemical (PEC) water decomposition. Mott-Schottky analysis is employed to confirm the formation of a type-II heterostructure between AgInS 2 nanoparticles and CeO 2 nanosheet arrays (NSAs) fabricated through electrochemical deposition and successive ionic layer adsorption and reaction. Electrochemical impedance spectroscopy, photoluminescence analysis, and Bode diagram spectroscopy confirm the effective charge carrier separation and significantly prolonged the charge lifetime of the CeO 2 /AgInS 2 heterojunction photoanode. Consequently, the maximum photocurrent density of the constructed CeO 2 /AgInS 2 photoanode relative to Ag/AgCl under zero bias test conditions is 69.8 times higher than the pure CeO 2 NSAs. Additionally, the charge transfer mechanism is further verified by the calculated work function and differential charge density of CeO 2 /AgInS 2 heterojunction. This study provides a valuable reference for the synthesis and preparation of heterojunction photoanode for efficient PEC water decomposition.
研究领域:
材料科学
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
Molecular Catalysis
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2021
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IF 5.062
Yu Guan,Yinhe Liu,Qiang Lv,Bo Wang
The selective catalytic reduction of nitrogen oxides (NO x ) by carbon monoxide (CO-SCR) is a promising way to deal with exhaust gasses. And Effective redox cycle and NO dissociation ability are crucial factors for catalytic reduction of NO x . Herein, Fe decorated CeO 2 microsphere catalysts with surface oxygen defect were synthesized by solvothermal and calcination method. Among all catalysts, 0.5Fe-CeO 2 sample showed excellent catalytic performance with efficiency near 96% for NO reduction under the condition of 550 ppmv NO, 1200 ppmv CO, and 40,000 h − 1 of GHSV. It was found that Fe doping could efficiently regulate Ce 4+ /Ce 3+ redox couple and oxygen vacancy for catalytic activity. XRD, Raman, XPS, EPR and H 2 -TPR etc. were employed to explore the physicochemical properties of samples. The results showed that Fe had been incorporated into CeO 2 by XRD, and the results of Raman spectrum and XPS indicated that Ce 4+ /Ce 3+ redox couple existed in 0.5Fe-CeO 2 catalyst. Furthermore, the H 2 -TPR spectrum displayed the formation of oxygen vacancy in the samples. N 2 adsorption-desorption isotherms indicated that the doping of Fe could enlarge the specific surface area, pore volume and pore dimeter of the samples, and thus greatly enhanced the NO adsorption and further NO catalytic reduction on catalysts. In addition, other characterization of physicochemical properties and density functional theory (DFT) calculation were performed to reveal the mechanism of NO + CO reaction. As a result, a mechanism was proposed to elucidate highly efficient NO reduction over the catalysts of Fe decorated CeO 2 microspheres. Finally, the synergistic effects of redox center and oxygen vacancy on catalytic activity enhancement were revealed. This work provides a promising way to the design of efficient catalysts for NO reduction.
研究领域:
催化化学
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环境科学
✓ 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）