CATALYSIS COMMUNICATIONS
·
2019
·
IF 3.674
Bowen Lu,Fengjiao Quan,Zheng Sun,Falong Jia,Lizhi Zhang
Photothermal reverse-water-gas-shift is realized with high conversion rate and selectivity of CO in the case of Au/CeO 2 catalyst. Moreover, photothermal reaction rate is much higher (>10 times) than that performed under thermal condition. As indicated by the results of in-situ infrared spectroscopy and kinetic experiments, the special role of light is found to be related with the promotion of hydrogen-splitting step. The robust Au/CeO 2 catalyst exhibits stable activity and CO selectivity under long-term light irradiation. It is expected that the combination of catalysts and light may afford new perspectives for the CO 2 hydrogenation.
研究领域:
化学工程
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环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2021
·Vol. 168
·期 5
·052507
·
IF 4.316
Qingchun Wang,Zihao Wang,Xiaolong Liang,Shengli An,Changkun Cai,Yuanyuan Liu,Jinxiao Bao,Xiwen Song
Spherical CeO2 and CeO2-ZrO2 solid solutions are prepared using a hydrothermal method, Pt/CeO2-ZrO2/GO and Pt-CeO2/GO catalysts are prepared using graphene as a carrier, and the effects of the addition of a CeO2-ZrO2 solid solution on the electrocatalytic activity, stability and anti-CO poisoning performance of methanol fuel cell anodes are investigated. The catalyst samples are characterized via X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and transmission electron microscopy (TEM), and the electrochemical properties of the catalysts are investigated using an electrochemical workstation (IVIUM). The results show that Pt/CeO2-ZrO2/GO has a higher electrocatalytic activity and stability against CO oxidation than Pt-CeO2/GO, Pt/GO and commercial Pt/C catalysts, which is attributed to ZrO2. When Zr4+ is added into the CeO2 lattice, the activity of oxygen in the CeO2 lattice, the oxygen mobility and the oxygen vacancies are increased, the oxygen storage capacity is improved, and the intermediate product of CO is more easily oxidized. This finding indicates that Pt/CeO2-ZrO2/GO is a methanol oxidation anode catalyst with a good catalytic activity, stability and resistance to CO poisoning.
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
DOI
高影响因子
Materials Today Communications
·
2024
·
IF 3.7
Ke Yang,Sisi Cheng,Ziqin Yao,Shijia Li,Yuting Yang
Recently, the remarkable properties of ternary transition metal oxides with spinel structure derived from metal-organic frameworks (MOFs) have attracted researchers’ attention in the field of electrochemistry . In this work, zeolitic imidazolate frameworks (Zn-ZIF-67) was grown in situ on the surface of another metal organic framework (Ce-BTC) by internal expansion growth method (IEGM), and then the bow shaped ZnCo 2 O 4 /CeO 2 nanocomposite was prepared by using the resulting complex as template. When applied as enzyme-free glucose sensor, the bow shaped ZnCo 2 O 4 /CeO 2 nanocomposite shows good catalytic performance of glucose oxidation , especially the sensitivity value(2161.78μA·mM -1 ·cm -2 ) is higher than most of the reported results, with a very short response time (<1 s), and a low detection limit of 0.055 μM (S/N = 3). Furthermore, the modified electrode can continue to function correctly even when exposed to a range of interference-causing compounds and can be used for extended periods of time in air. Utilizing fruit juice to test this enzyme-free glucose sensor yielded good results, raising the possibility of future applications.
研究领域:
材料科学
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生物医学工程
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分析化学
✓ 已验证
产品关联
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2020
·Vol. 7
·期 6
·1345-1361
·
IF 5.958
Yu Zhang,Qian Shao,Heyun Jiang,Lirong Liu,Mingyang Wu,Jing Lin,Jiaoxia Zhang,Shide Wu,Mengyao Dong,Zhanhu Guo
Bismuth oxychloride (BiOCl) and cerium dioxide (CeO2) composites were successfully synthesized via a facile one-step co-precipitation method. The BiOCl/CeO2 composites were observed to be sheet-like structures with some CeO2 nanoparticles distributed on the surface. The BiOCl/CeO2 composites exhibited higher photodegradation performance (98.8%) of rhodamine B (RhB) than pure BiOCl (80.2%) and CeO2 (9.6%) under solar simulated irradiation. The BiOCl/CeO2 composites with a Bi/Ce molar ratio of 4 : 1 exhibited the highest photocatalytic performance for RhB, and an optimal RhB degradation efficiency of 98.8% was achieved under solar simulated irradiation for 60 min. The photocatalytic performance results were compared with other BiOCl composites. The photocatalytic mechanisms of BiOCl/CeO2 composites were discussed by radical trapping experiments and electron spin resonance (ESR), which indicated that h+ and ˙O2− were the dominant radicals for RhB degradation.
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
Catalysis Science & Technology
·
2022
·Vol. 12
·期 4
·1245-1256
·
IF 6.177
Jie Yang,Shan Ren,Mingming Wang,Zhichao Chen,Lin Chen,Lian Liu
Ce–Ti catalysts were considered as a promising replacement for V–Ti based catalysts for selective catalytic reduction (SCR) of nitrogen oxides (NO and NO2) with NH3. In this work, a CeO2/TiO2 catalyst was prepared by the impregnation method and studied by a series of in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) experiments. The results showed that CeO2 particles grew along TiO2 faces and amorphous cerium in the lattice of TiO2, both of which are present on the CeO2/TiO2 catalyst. NH4+ might adsorb on the Ti–O–Ce structures or TiO2–CeO2 interface as Brønsted acid sites, while two types of NH4+ species were distinguished by the time-resolved spectroscopic method due to the different increasing trends. Based on the temporal evolution transient in situ DRIFTS spectra, L-NH3 had higher activity than coordinated NH3 species, which suggested that gas phase NO reacted preferentially with L-NH3. The NH4NO3 intermediate dominated the SCR reactions over the CeO2/TiO2 catalyst, which followed the Eley–Rideal mechanism.
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
JOURNAL OF RARE EARTHS
·
2023
·
IF 4.9
Bolang Li,Fei Wang,Kai Li,Ping Ning,Min Chen,Changbin Zhang
The chemical transformation of CO 2 produces carbon compounds that can be used as precursors for the production of chemicals and fuels. Here, we investigated the activity and selectivity of the transition metals (Fe, Co, and Ni) supported on CeO 2 catalyst for CO 2 hydrogenation at atmospheric pressure. We found that Ni/CeO 2 shows the highest CO 2 conversion compared with Fe/CeO 2 and Co/CeO 2 . Besides, Co/CeO 2 and Ni/CeO 2 exhibit nearly 100% CH 4 selectivity while Fe/CeO 2 inclines to produce CO. The characterization results show that the metal-support interaction order is Fe/CeO 2 > Co/CeO 2 > Ni/CeO 2 , the weak metal-support interaction over Ni/CeO 2 benefits the activation of H 2 and then promotes the activity of CO 2 hydrogenation. Additionally, in situ DRIFTS results demonstrate that monodentate formate species rather than bidentate formate are the active intermediates. The main route of CO 2 hydrogenation to CH 4 is that CO 2 is firstly transformed to m-HCOO∗ and then direct hydrogenation of the m-HCOO∗ to CH 4 . This study provides insights into the understanding of the mechanisms of CO 2 hydrogenation on CeO 2 based catalysts.
研究领域:
催化化学
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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
POLYMER COMPOSITES
·
2023
·Vol. 44
·期 10
·6440-6453
·
IF 5.2
Bi Yang,Beibei Chen,Wenquan Dong,Yang Tong,Jiaye Li
Polymer self-lubricating composite coatings have been widely used on the surface of machinery to extend the life of the moving systems/parts by controlling friction and wear. In this work, epoxy nanocomposite coating with the thickness of about 60 μm was fabricated with addition of hexagonal boron nitride nanosheets (BNNSs)/CeO 2 nanohybrid for enhancement in antifriction and wear resistance. The active BNNSs were first obtained by exfoliating h-BN with alkaline solution, and then the rare earth oxide of CeO 2 nanoparticles were immobilized on the surface of BNNSs through hydrothermal method. The microstructure morphology and chemical composition of as-proposed BNNSs/CeO 2 were characterized by field emission scanning electron microscopy, HRTEM, Fourier transform infrared spectroscopy, RS, X-ray diffraction, and X-ray photoelectron spectroscopy. And the tribological behaviors of epoxy nanocomposite coatings containing BNNSs, CeO 2 , and BNNSs/CeO 2 were investigated comparatively using ball-on disc friction tester (MPX-3). And the 440C stainless-steel ball with diameter of 8 mm was used as the counterface material. Tribological tests showed that epoxy-BNNSs/CeO 2 had the best friction and wear reduction properties, and the lowest coefficient of friction and wear rate of epoxy-based composite coating were achieved when the content of BNNSs/CeO 2 was 0.5 wt%, with 84.9% and 96.3% reduction, respectively. Moreover, the effect of sliding conditions on the tribological performance of epoxy-BNNSs/CeO 2 was investigated. The corresponding enhancing mechanisms of BNNSs/CeO 2 were discussed as well.
研究领域:
材料科学
·
摩擦学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 14
·6747-6755
·
IF 8.867
Can Cao,Jian Xie,Shichao Zhang,Bin Pan,Gaoshao Cao,Xinbing Zhao
Lithium–oxygen (Li–O2) cells are receiving intense interest because of their extremely high energy density. A highly efficient catalyst for the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is a key factor influencing the performance of lithium–oxygen cells. In this work, we prepared a highly efficient CeO2-decorated δ-MnO2 (CeO2/δ-MnO2) catalyst which is composed of graphene-like δ-MnO2 with ultrafine CeO2 nanocrystals decorated on it. Li–O2 cells with the CeO2/δ-MnO2 catalyst exhibit superior electrochemical performance, including high discharge specific capacity (8260 mA h g−1 at 100 mA g−1), good rate capability (735 mA h g−1 at 1600 mA g−1), and excellent cycling stability (296 cycles at a limited capacity of 500 mA h g−1), which is much better than that with a bare δ-MnO2 catalyst. The achievement of excellent electrochemical performance is attributed to the highly efficient co-catalytic ability of δ-MnO2 and CeO2 and the desirable graphene-like architecture of the CeO2/δ-MnO2 catalyst, as well as the formation of the thin-layered discharge product Li2O2.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry B
·
2016
·Vol. 4
·期 25
·4402-4409
·
IF 4.872
Nan Lv,Zhigang Wang,Wenzhi Bi,Guangming Li,Jilin Zhang,Jiazuan Ni
The novel chloro(dimethyl)octylsilane (C8)-functionalized [CeO2//SiO2] Janus fibers (denoted CeO2//SiO2-C8) have been successfully prepared by electrospinning technique and subsequent modification. The CeO2//SiO2-C8 Janus fiber composed of the side-by-side CeO2 fiber and SiO2 fiber modified by C8 is endowed with separate affinity sites and hydrophobic chains. It has a relatively high specific surface area of 127.4 m2 g−1 with an average pore size of 4.1 nm. The potential of CeO2//SiO2-C8 Janus fibers for the selective capture and individual MS detection of low-abundance endogenous peptides and phosphopeptides from the tryptic protein digest and human serum real sample was explored and evaluated for the first time. The experimental results demonstrate that the CeO2//SiO2-C8 Janus fiber can selectively extract phosphopeptides in virtue of high selective affinity of CeO2 to phosphate groups and enrich low-abundance peptides on account of the strong hydrophobic interaction of C8 chains. Moreover, the enrichment performance of the CeO2//SiO2-C8 probe is superior to that of commercial products (e.g. TiO2 nanoparticles and ZipTipC18 pipette tips) available. Overall, the efficient enrichment capability of CeO2//SiO2-C8 Janus fibers makes them a prospective candidate for the capture of low-abundance endogenous peptides and phosphopeptides from complex biological samples for individual MS detection.
研究领域:
生物化学
·
分析化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ChemCatChem
·
2022
·Vol. 14
·期 16
·e202200509
·
IF 5.497
Jiefei Li,Zhenyu Li,Zexuan Zheng,Xueqiong Zhang,Hao Zhang,Hang Wei,Haibin Chu
Graphical Biomass conversion : Electro-oxidation of glycerol over the Pt/CNT catalyst suffers from the poor activity, low glyceric acid (GLYA) selectivity, and high cost of the noble metal. The incorporation of CeO 2 into Pt/CNT achieves much enhanced yield of GLYA with even half dosage of Pt. Electrocatalytic oxidation of glycerol is a highly efficient way for upgrading glycerol toward fine chemicals. Currently, electro-oxidation of glycerol into the high value-added C3 products remains a big challenge because of the poor catalytic activity, low selectivity, and high cost of the noble metal catalysts, especially in the alkaline medium. Here, we report that the Pt−CeO 2 /CNT (CNT=carbon nanotubes) catalyst remarkably promotes the conversion (86.5 % vs. 37.6 %) and recycling stability for glycerol electro-oxidation reaction, as compared with Pt/CNT. However, the improved catalytic activity of Pt−CeO 2 /CNT is accompanied by the further oxidation of C3 products including glyceric acid (GLYA). By tuning the product distribution by the ratio of CeO 2 and CNT, applied potential, and the Pt loading amount, the high selectivities of C3 products (95 %) and GLYA (59 %) are achieved together with the high glycerol conversion (86 %), leading to the impressive yields of C3 products (81 %) and GLYA (50 %). The unique contributions of CeO 2 includes not only the enhanced catalytic activity and recycling stability, but also the suppressed further oxidation of GLYA. Moreover, higher yield of GLYA is reached over Pt−CeO 2 /CNT even with half loading of Pt, as compared with Pt/CNT.
研究领域:
化学工程
·
催化材料科学
✓ 已验证
产品关联
DOI
高影响因子
ChemPlusChem
·
2023
·Vol. 88
·期 3
·e202300023
·
IF 3.4
Cheng Nan,Huimin Yang,Fanfan Gao,Nan Gao,Wenjing Zhou,Haiyan Du,Zhenhai Liang
Graphical A series of molybdenum - doped CeO 2 nanorod catalysts were successfully fabricated via a hydrothermal reaction coupled with high temperature calcination. The obtained 5 %-Mo-CeO 2 nanorods provide as a superior electrocatalyst in neutral electrolytes of 0.1 M Na 2 SO 4 . Such electrocatalyst significantly enhances nitrogen reduction reaction performance with an NH 3 yield of 10.9 μg h −1 mg −1 cat at −0.45 V vs reversible hydrogen electrode (RHE) and a Faradaic efficiency of 26.5 % at −0.25 V vs RHE, much higher 4 times than of CeO 2 nanorods (2.6 μg h −1 mg −1 cat ; 4.9 %). As a green and sustainable strategy, the electrocatalytic N 2 reduction reaction (NRR) has been considered the best potential approach to replace the traditional Haber-Bosch process under ambient conditions. The key is to exploit efficient and low-cost electrocatalysts according to the current situation. Herein, a series of Molybdenum (Mo) doped CeO 2 nanorods (NR) catalysts were successfully fabricated via a hydrothermal reaction coupled with high temperature calcination. The nanorod structures were not altered after Mo atom doping. The obtained 5 %-Mo-CeO 2 nanorods act as a superior electrocatalyst in neutral electrolytes of 0.1 M Na 2 SO 4 . Such electrocatalyst significantly enhances NRR performance with an NH 3 yield of 10.9 μg h −1 mg −1 cat at −0.45 V vs reversible hydrogen electrode (RHE) and a Faradaic efficiency (FE) of 26.5 % at −0.25 V vs RHE. That outcome is 4 times higher than that of CeO 2 nanorods (2.6 μg h −1 mg −1 cat ; 4.9 %). Meanwhile, density functional theory (DFT) calculation shows the characteristics after Mo doping: the band gap value lowers, the density of states increases, electrons are more easily excited, and N 2 molecules are more easily adsorbed, thereby enhancing the activity of the electrocatalytic NRR.
研究领域:
材料科学
·
电化学
·
理论计算
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Kamran Ashraf,Zebo Liu,Qamar uz Zaman,Muhammad Arshad,Waqas Qamar Zaman,Ali Shan,Junxiong Yu,Touseef ur Rehman,Yingping Zhuang,Meijin Guo,Ali Mohsin
Elicitation is a potent strategy to enhance secondary metabolite yield, and nanoparticle-mediated elicitation offers a compelling alternative to traditional methods. Carthamus tinctorius ( C. tinctorius ) is rich in bioactive chlorogenic acids (CGAs) within its suspension cells. However, the mechanism by which doped nanoparticles (NPs) stimulate the CGAs biosynthesis in the cells remains unclear. Therefore, this study first elucidated the synthesis and characterization of selenium (Se)-doped CeO 2 @Fe 3 O 4 NPs and then explored their regulatory effect and mechanism for the CGAs biosynthesis in C. tinctorius cells. Material characterization via TEM, XPS, XRD, and EDX analysis confirmed the successful synthesis of selenium-dopped CeO 2 @Fe 3 O 4 nanocomposite. Fe 3 O 4 , CeO 2 , Fe 3 O 4 @CeO 2 , and selenium-dopped CeO 2 @Fe 3 O 4 NP treatments all promoted the biosynthesis of CGAs in the cells. Notably, the group treated with 15 mg L -1 selenium-dopped CeO 2 @Fe 3 O 4 NPs showed best effect (37.04 mg g −1 , 1.92 times that of control). Finally, metabolome and transcriptome profiling revealed the differential alterations in the content of 45 primary metabolites and differential expression of 83 CGA biosynthesis-related genes. This suggested that selenium-doped CeO 2 @Fe 3 O 4 NPs up-regulated the expression of CGA biosynthesis-related genes, and consequently enhanced CGAs accumulation in the cells. This study provides the first evidence that selenium-doped CeO 2 @Fe 3 O 4 acts as nano-elicitors for the biosynthesis of CGAs.
研究领域:
植物学
·
纳米生物学
·
代谢组学
·
转录组学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）