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Yao R, Pinals J, Dorakhan R, Herrera JE, Zhang M, Deshlahra P, Chin YHC. Cobalt-Molybdenum Oxides for Effective Coupling of Ethane Activation and Carbon Dioxide Reduction Catalysis. ACS Catal 2022. [DOI: 10.1021/acscatal.2c02525] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Rui Yao
- Department of Chemical Engineering and Applied Chemistry, University of Toronto, Toronto, Ontario M5S 3E5, Canada
- Key Laboratory of Green Chemical Technology of Ministry of Education, R&D Center for Petrochemical Technology, Tianjin University, Tianjin 300072, China
- Postdoctoral Programme Office, Guosen Securities Co., Ltd., Shenzhen 518001, China
| | - Jayson Pinals
- Department of Chemical and Biological Engineering, Tufts University, Medford, Massachusetts 02155, United States
| | - Roham Dorakhan
- Department of Chemical Engineering and Applied Chemistry, University of Toronto, Toronto, Ontario M5S 3E5, Canada
| | - José E. Herrera
- Department of Chemical and Biochemical Engineering, Western University, London, Ontario N6A 5B9, Canada
| | - Minhua Zhang
- Key Laboratory of Green Chemical Technology of Ministry of Education, R&D Center for Petrochemical Technology, Tianjin University, Tianjin 300072, China
| | - Prashant Deshlahra
- Department of Chemical and Biological Engineering, Tufts University, Medford, Massachusetts 02155, United States
| | - Ya-Huei Cathy Chin
- Department of Chemical Engineering and Applied Chemistry, University of Toronto, Toronto, Ontario M5S 3E5, Canada
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2
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Xu H, Liu C, Srinivasakannan C, Chen M, Wang Q, Li L, Dai Y. Hydrothermal synthesis of one-dimensional α-MoO3 nanomaterials and its unique sensing mechanism for ethanol. ARAB J CHEM 2022. [DOI: 10.1016/j.arabjc.2022.104083] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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3
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Catalytic Hydrotreating of Crude Pongamia pinnata Oil to Bio-Hydrogenated Diesel over Sulfided NiMo Catalyst. ENERGIES 2022. [DOI: 10.3390/en15041547] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
This work studied the catalytic activity and stability of Ni-MoS2 supported on γ-Al2O3, SiO2, and TiO2 toward deoxygenation of different feedstocks, i.e., crude Pongamia pinnata oil (PPO) and refined palm olein (RPO). PPO was used as a renewable feedstock for bio-hydrogenated diesel production via catalytic hydrotreating under a temperature of 330 °C, H2 pressure of 50 bar, WHSV of 1.5 h−1, and H2/oil (v/v) of 1000 cm3/cm3 under continuous operation. The oil yield from a Soxhlet extraction of PPO was up to 26 wt.% on a dry basis, mainly consisting of C18 fatty acids. The catalytic activity in terms of conversion and diesel yield was in the same trend as increasing in the order of NiMo/γ-Al2O3 > NiMo/TiO2 > NiMo/SiO2. The hydrodeoxygenation (HDO) activity was more favorable over the sulfided NiMo supported on γ-Al2O3 and TiO2, while a high DCO was observed over the sulfided NiMo/SiO2 catalyst, which related to the properties of the support material and the intensity of metal–support interaction. The deactivation of NiMo/SiO2 and NiMo/TiO2 occurred in a short period, due to the phosphorus and alkali impurities in PPO which were not found in the case of RPO. NiMo/γ-Al2O3 exhibited the high resistance of impure feedstock with excellent stability. This indicates that the catalytic performance is influenced by the purity of the feedstock as well as the characteristics of the catalysts.
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Arshad HMU, Liu S, Li GR, Gao XP. La 2MoO 6 as an Effective Catalyst for the Cathode Reactions of Lithium-Sulfur Batteries. ACS APPLIED MATERIALS & INTERFACES 2022; 14:5247-5256. [PMID: 35073036 DOI: 10.1021/acsami.1c20129] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Lithium-sulfur batteries with high theoretical energy density have emerged as one of the most promising next-generation rechargeable batteries, while their discharge capacity and cycle stability are challenges mainly due to the shuttle effect of polysulfide intermediates. Employing an effective catalyst for the conversion of polysulfides in cathode reactions can promote the reaction kinetics to restrain the shuttle of polysulfides. Here, for the first time, La2MoO6 (LMO) as a catalyst is introduced into sulfur cathodes. To investigate the effect of La2MoO6, we prepare two different structures of La2MoO6/carbon nanofiber composites. One is carbon nanofiber-supported crystalline La2MoO6 nanoparticles (LMO@CNFs) and the other is amorphous La2MoO6 nanoparticles embedded in carbon nanofibers (LMO-in-CNFs). For sulfur electrodes with ∼73 wt % sulfur loading, LMO@CNFs/S and LMO-in-CNFs/S deliver initial gravimetric capacities of 1493.4 and 1246.7 mA h g-1, respectively, at a 0.1C rate, obviously higher than that of the control sample CNFs/S. Moreover, LMO@CNFs/S shows much better rate performance than LMO-in-CNFs/S, indicating strongly that La2MoO6 is a highly effective catalyst to promote kinetic conversion of polysulfides.
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Affiliation(s)
- Hafiz Muhammad Umair Arshad
- Institute of New Energy Material Chemistry, School of Materials Science and Engineering, Renewable Energy Conversion and Storage Centre, Nankai University, Tianjin 300350, China
| | - Sheng Liu
- Institute of New Energy Material Chemistry, School of Materials Science and Engineering, Renewable Energy Conversion and Storage Centre, Nankai University, Tianjin 300350, China
| | - Guo-Ran Li
- Institute of New Energy Material Chemistry, School of Materials Science and Engineering, Renewable Energy Conversion and Storage Centre, Nankai University, Tianjin 300350, China
| | - Xue-Ping Gao
- Institute of New Energy Material Chemistry, School of Materials Science and Engineering, Renewable Energy Conversion and Storage Centre, Nankai University, Tianjin 300350, China
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Nanostructured Molybdenum-Oxide Anodes for Lithium-Ion Batteries: An Outstanding Increase in Capacity. NANOMATERIALS 2021; 12:nano12010013. [PMID: 35009963 PMCID: PMC8746398 DOI: 10.3390/nano12010013] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/06/2021] [Revised: 12/15/2021] [Accepted: 12/17/2021] [Indexed: 11/16/2022]
Abstract
This work aimed at synthesizing MoO3 and MoO2 by a facile and cost-effective method using extract of orange peel as a biological chelating and reducing agent for ammonium molybdate. Calcination of the precursor in air at 450 °C yielded the stochiometric MoO3 phase, while calcination in vacuum produced the reduced form MoO2 as evidenced by X-ray powder diffraction, Raman scattering spectroscopy, and X-ray photoelectron spectroscopy results. Scanning and transmission electron microscopy images showed different morphologies and sizes of MoOx particles. MoO3 formed platelet particles that were larger than those observed for MoO2. MoO3 showed stable thermal behavior until approximately 800 °C, whereas MoO2 showed weight gain at approximately 400 °C due to the fact of re-oxidation and oxygen uptake and, hence, conversion to stoichiometric MoO3. Electrochemically, traditional performance was observed for MoO3, which exhibited a high initial capacity with steady and continuous capacity fading upon cycling. On the contrary, MoO2 showed completely different electrochemical behavior with less initial capacity but an outstanding increase in capacity upon cycling, which reached 1600 mAh g-1 after 800 cycles. This outstanding electrochemical performance of MoO2 may be attributed to its higher surface area and better electrical conductivity as observed in surface area and impedance investigations.
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6
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Wu Y, Zhang J, Duan H, Zhao Y, Dong Y. Synthesis of a full range Fe-doped ZnFe xCo 2-xO 4 and its application as anode material for lithium-ion battery. Dalton Trans 2021; 50:15036-15046. [PMID: 34610075 DOI: 10.1039/d1dt02865k] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Fe-Doped ZnFexCo2-xO4 (x = 0.00, 0.17, 0.33, 0.47, 0.67, 0.87, 1.17, 1.37, 1.67, 1.87, 2.00) compounds were prepared by a sol-gel method. X-ray diffraction measurements show that Fe-doping does not change the crystal structure of ZnCo2O4 and dopant Fe successfully occupies the 16c Co site. Because of the bigger radius of the doping ion, the cell parameters and cell volumes of ZnFexCo2-xO4 compounds present an obvious linear increase with increasing Fe content. In addition, attributed to the similar crystal structures for ZnFe2O4 and ZnCo2O4, a full range (0 ≤ x ≤ 2) of ZnFexCo2-xO4 solid solution phases was obtained. V/I measurement results show that a small Fe doping content obviously improved the electronic conductivity of the sample. In addition, due to the smaller particles size and uniform particle distribution caused by Fe doping, the lithium ion diffusion coefficient of the sample was increased by 2 orders of magnitude. Based on the improved electronic conductivity combined with the significantly increased lithium-ion diffusion coefficient, a sample with Fe doping content of x = 0.33, ZnFe0.33Co1.67O4, presents a high reversible specific capacity and excellent rate cycle stability. At a rate of 100 mA g-1, a relatively high discharge capacity of 850 mA h g-1 can still be obtained after 100 cycles, which is obviously higher than that of pure ZnCo2O4 (only 295 mA h g-1). Even at a higher discharge rate of 500 mA g-1, a discharge capacity of 450 mA h g-1 with a capacity retention of nearly 100% was obtained. Based on its excellent electrochemical properties, ZnFe0.33Co1.67O4 will be a promising anode material for rechargeable lithium-ion batteries.
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Affiliation(s)
- You Wu
- School of Physics and Optoelectronics, South China University of Technology, Guangzhou, 510640, P. R. China.
| | - Jun Zhang
- Ruyuan Dongyangguang Magnetic Materials Co., Ltd., Shaoguan, 512700, P. R. China
| | - He Duan
- School of Physics and Optoelectronic Engineering, Guangdong University of Technology, Guangzhou, 510006, P. R. China
| | - Yanming Zhao
- School of Physics and Optoelectronics, South China University of Technology, Guangzhou, 510640, P. R. China.
| | - Youzhong Dong
- School of Physics and Optoelectronics, South China University of Technology, Guangzhou, 510640, P. R. China.
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7
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A Combined Strategy to Improve the Performance of Dental Alloys Using a New CoCrNbMoZr Alloy with Mn and Si Coated via an Anodic Oxidation Procedure. METALS 2021. [DOI: 10.3390/met11071017] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The aim of the paper is based on a combined approach to improve dental alloy performance using a new Ni-free Co–Cr composition with Mo, Nb and Zr and coated with an anodic oxidation film. The coated and uncoated samples were surface characterized by performing SEM (scanning electronic microscopy), XRD (X-rays diffraction) contact angle measurements and corrosion studies with open circuit potential, potentiodynamic polarization and EIS (impedance electrochemical spectroscopy) procedures. The SEM equipment with an EDX (Energy-dispersive X-ray spectroscopy) module indicated the sample morphology and the XRD investigations established the formation of the oxides. The electrochemical procedures were performed in Ericsson artificial saliva for coated samples in various conditions. Based on all the experiments, including the decrease in the hydrophobic character of the uncoated samples and the decrease in the hydrophilic values of the anodized alloys, the improved performance of the coated samples was established as a conclusion.
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Lin CC, Hsu CT, Liu W, Huang SC, Lin MH, Kortz U, Mougharbel AS, Chen TY, Hu CW, Lee JF, Wang CC, Liao YF, Li LJ, Li L, Peng S, Stimming U, Chen HY. In Operando X-ray Studies of High-Performance Lithium-Ion Storage in Keplerate-Type Polyoxometalate Anodes. ACS APPLIED MATERIALS & INTERFACES 2020; 12:40296-40309. [PMID: 32841558 DOI: 10.1021/acsami.0c09344] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Polyoxometalates (POMs) have emerged as potential anode materials for lithium-ion batteries (LIBs) owing to their ability to transfer multiple electrons. Although POM anode materials exhibit notable results in LIBs, their energy-storage mechanisms have not been well-investigated. Here, we utilize various in operando and ex situ techniques to verify the charge-storage mechanisms of a Keplerate-type POM Na2K23{[(MoVI)MoVI5O21(H2O)3(KSO4)]12 [(VIVO)30(H2O)20(SO4)0.5]}·ca200H2O ({Mo72V30}) anode in LIBs. The {Mo72V30} anode provides a high reversible capacity of up to ∼1300 mA h g-1 without capacity fading for up to 100 cycles. The lithium-ion storage mechanism was studied systematically through in operando synchrotron X-ray absorption near-edge structure, ex situ X-ray diffraction, ex situ extended X-ray absorption fine structure, ex situ transmission electron microscopy, in operando synchrotron transmission X-ray microscopy, and in operando Raman spectroscopy. Based on the abovementioned results, we propose that the open hollow-ball structure of the {Mo72V30} molecular cluster serves as an electron/ion sponge that can store a large number of lithium ions and electrons reversibly via multiple and reversible redox reactions (Mo6+ ↔ Mo1+ and V5+/V4+↔ V1+) with fast lithium diffusion kinetics (DLi+: 10-9-10-10 cm2 s-1). No obvious volumetric expansion of the microsized {Mo72V30} particle is observed during the lithiation/delithiation process, which leads to high cycling stability. This study provides comprehensive analytical methods for understanding the lithium-ion storage mechanism of such complicated POMs, which is important for further studies of POM electrodes in energy-storage applications.
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Affiliation(s)
- Chia-Ching Lin
- Department of Materials Science and Engineering, National Tsing Hua University, 101, Sec. 2, Kuang-Fu Road, Hsinchu 30013, Taiwan
| | - Chi-Ting Hsu
- Department of Materials Science and Engineering, National Tsing Hua University, 101, Sec. 2, Kuang-Fu Road, Hsinchu 30013, Taiwan
| | - Wenjing Liu
- Department of Life Sciences and Chemistry, Jacobs University, Campus Ring 1, 28759 Bremen, Germany
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing 211816, P. R. China
| | - Shao-Chu Huang
- Department of Materials Science and Engineering, National Tsing Hua University, 101, Sec. 2, Kuang-Fu Road, Hsinchu 30013, Taiwan
| | - Ming-Hsien Lin
- Department of Chemical and Materials Engineering, Chung Cheng Institute of Technology, National Defense University, Taoyuan 334, Taiwan
| | - Ulrich Kortz
- Department of Life Sciences and Chemistry, Jacobs University, Campus Ring 1, 28759 Bremen, Germany
| | - Ali S Mougharbel
- Department of Life Sciences and Chemistry, Jacobs University, Campus Ring 1, 28759 Bremen, Germany
| | - Tsan-Yao Chen
- Department of Engineering and System Science, National Tsing Hua University, 101, Sec. 2, Kuang-Fu Road, Hsinchu 30013, Taiwan
| | - Chih-Wei Hu
- National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu 30013, Taiwan
| | - Jyh-Fu Lee
- National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu 30013, Taiwan
| | - Chun-Chieh Wang
- National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu 30013, Taiwan
| | - Yen-Fa Liao
- National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu 30013, Taiwan
| | - Lain-Jong Li
- Physical Science and Engineering Division, King Abdullah University of Science and Technology, Thuwal 23955, KSA
| | - Linlin Li
- Jiangsu Key Laboratory of Electrochemical Energy Storage Technologies, College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
| | - Shengjie Peng
- Jiangsu Key Laboratory of Electrochemical Energy Storage Technologies, College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
| | - Ulrich Stimming
- Chemistry-School of Natural and Environmental Sciences, Newcastle University, Newcastle upon Tyne NE1 7RU, U.K
| | - Han-Yi Chen
- Department of Materials Science and Engineering, National Tsing Hua University, 101, Sec. 2, Kuang-Fu Road, Hsinchu 30013, Taiwan
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Kebede WL, Kuo DH, Ahmed KE, Abdullah H. Dye degradation over the multivalent charge- and solid solution-type n-MoS2/p-WO3 based diode catalyst under dark condition with a self-supporting charge carrier transfer mechanism. ADV POWDER TECHNOL 2020. [DOI: 10.1016/j.apt.2020.04.028] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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Khlyustova A, Sirotkin N, Kraev A, Titov V, Agafonov A. Plasma-liquid synthesis of MoO x and WO 3 as potential photocatalysts. Dalton Trans 2020; 49:6270-6279. [PMID: 32329498 DOI: 10.1039/d0dt00834f] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Plasmas in contact with liquids represent a green chemistry method for the synthesis of metal oxides. In this work, underwater plasma was used for the synthesis of molybdenum and tungsten oxides. The obtained samples were analyzed by various techniques. Results showed that underwater plasma with Mo electrodes allows obtaining non-stoichiometric molybdenum oxide (MoOx). In the case of tungsten electrodes, monoclinic WO3 was formed. The synthesized oxides have a wide band gap (3.21 eV for MoOx and 3.27 eV for WO3). The photocatalytic and sorption activities of the synthesized oxides towards the decomposition of cationic and anionic dyes (Methylene Blue, Rhodamine B, and Reactive Red 6C) were studied. MoOx shows excellent photocatalytic performance under UV and visible light irradiation. The photocatalytic activity of WO3 under visible light is less than that under UV irradiation.
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Affiliation(s)
- Anna Khlyustova
- G. A. Krestov Institute of Solution Chemistry, Academicheskaja, str., 1, Ivanovo, 153045, Russia.
| | - Nikolay Sirotkin
- G. A. Krestov Institute of Solution Chemistry, Academicheskaja, str., 1, Ivanovo, 153045, Russia.
| | - Anton Kraev
- G. A. Krestov Institute of Solution Chemistry, Academicheskaja, str., 1, Ivanovo, 153045, Russia.
| | - Valeriy Titov
- G. A. Krestov Institute of Solution Chemistry, Academicheskaja, str., 1, Ivanovo, 153045, Russia.
| | - Alexander Agafonov
- G. A. Krestov Institute of Solution Chemistry, Academicheskaja, str., 1, Ivanovo, 153045, Russia.
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Abstract
In this paper, we investigate the effects of operational conditions on structural, electronic and electrochemical properties on molybdenum suboxides (MoO3-δ) thin films. The films are prepared using pulsed-laser deposition by varying the deposition temperature (Ts), laser fluence (Φ), the partial oxygen pressure (PO2) and annealing temperature (Ta). We find that three classes of samples are obtained with different degrees of stoichiometric deviation without post-treatment: (i) amorphous MoO3-δ (δ < 0.05) (ii) nearly-stoichiometric samples (δ ≈ 0) and (iii) suboxides MoO3-δ (δ > 0.05). The suboxide films 0.05 ≤ δ ≤ 0.25 deposited on Au/Ti/SiO2/flexible-Si substrates with appropriate processing conditions show high electrochemical performance as an anode layer for lithium planar microbatteries. In the realm of simple synthesis, the MoO3-δ film deposited at 450 °C under oxygen pressure of 13 Pa is a mixture of α-MoO3 and Mo8O23 phases (15:85). The electrochemical test of the 0.15MoO3-0.85Mo8O23 film shows a specific capacity of 484 µAh cm−2 µm−1 after 100 cycles of charge-discharge at a constant current of 0.5 A cm−2 in the potential range 3.0-0.05 V.
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de Castro Silva I, Reinaldo AC, Sigoli FA, Mazali IO. Raman spectroscopy- in situ characterization of reversibly intercalated oxygen vacancies in α-MoO 3. RSC Adv 2020; 10:18512-18518. [PMID: 35517212 PMCID: PMC9053742 DOI: 10.1039/d0ra01207f] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2020] [Accepted: 05/04/2020] [Indexed: 11/30/2022] Open
Abstract
This work reports on the in situ strategy to reversibly generate or suppress oxygen vacancies on α-MoO3 which were probed by Raman spectroscopy. Reversible changes in two features of the α-MoO3 Raman spectrum could be correlated to the generation of oxygen vacancies: displacement of the Tb band frequency and the intensity decrease of the symmetrical stretching (νs) band. These two features could be used to qualitatively describe oxygen vacancies. Raman results also indicate that oxygen vacancies are located in the interlayer region of the α-MoO3 lattice. This observation is corroborated by in situ X-ray diffraction, which also indicates the absence of nonstoichiometric phase transitions. This work reports on the in situ strategy to reversibly generate or suppress oxygen vacancies on α-MoO3 which were probed by Raman spectroscopy.![]()
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Affiliation(s)
- Isaías de Castro Silva
- Laboratory of Functional Materials- Institute of Chemistry, University of Campinas - UNICAMP P. O. Box 6154 13083-970 Campinas SP Brazil
| | - Alice Cosenza Reinaldo
- Laboratory of Functional Materials- Institute of Chemistry, University of Campinas - UNICAMP P. O. Box 6154 13083-970 Campinas SP Brazil
| | - Fernando Aparecido Sigoli
- Laboratory of Functional Materials- Institute of Chemistry, University of Campinas - UNICAMP P. O. Box 6154 13083-970 Campinas SP Brazil
| | - Italo Odone Mazali
- Laboratory of Functional Materials- Institute of Chemistry, University of Campinas - UNICAMP P. O. Box 6154 13083-970 Campinas SP Brazil
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Synergetic Impact of Secondary Metal Oxides of Cr-M/MCM41 Catalyst Nanoparticles for Ethane Oxidative Dehydrogenation Using Carbon Dioxide. CRYSTALS 2019. [DOI: 10.3390/cryst10010007] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Oxidative dehydrogenation of alkanes to alkenes by a mild oxidant such as carbon dioxide is an active area of research. A series of MCM41-supported bimetallic oxide catalysts containing chromium oxide in addition to metal oxides (Ce, Co, Zn, V, Nb, and Mo) has been prepared. The binary catalysts have Cr metal oxide incorporated into MCM41 structure while the other oxides are either incorporated with Cr or impregnated on the MCM41 surface. The synthesized catalysts were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), N2 sorption, scanning electron microscopy (SEM), hydrogen temperature programmed reduction (H2-TPR), and Diffuse reflectance UV–vis spectroscopy (DRS). The catalytic activity of Cr(4)-M(4)/MCM-41 catalysts in the dehydrogenation of ethane with CO2 was investigated. The textural properties of the synthesized samples showed that the addition of the bimetallic oxides did not disturb the mesoporous structure of MCM41 and the prepared catalysts exhibited a high BET surface area; however, the lowest surface area was recorded for Cr(4)-Mo(4)/MCM41 catalyst at 701 m2/g. Among the prepared catalysts, H2-TPR profile of Cr(4)-Ce(4)/MCM41 revealed the increase in the concentration of Cr6+ species which interacted with the framework of siliceous support. On the other hand, H2-TPR profiles of Cr(4)-Co(4)/MCM41 showed wide reduction peaks centered at 400 °C which is ascribed to reduction of Cr6+ to Cr3+ species and Co3O4 to metallic Co. At the same time, Cr(4)-Mo(4)/MCM41 and Cr(4)-V(4)/MCM41 exhibited higher temperature reduction peaks, indicating these two catalysts require higher activation temperatures. The synergy between the Cr with Zn or Nb metals reduced the concentration of Cr6+ species which is reflected in their catalytic performance. Cr(4)-Ce(4)/MCM41 recorded the highest catalytic activity toward ethylene production where the ethane conversion and ethylene yield were 37.9% and 35.1%, respectively.
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Amorphous Mo 5O 14-Type/Carbon Nanocomposite with Enhanced Electrochemical Capability for Lithium-Ion Batteries. NANOMATERIALS 2019; 10:nano10010008. [PMID: 31861372 PMCID: PMC7022294 DOI: 10.3390/nano10010008] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/12/2019] [Revised: 12/14/2019] [Accepted: 12/17/2019] [Indexed: 11/25/2022]
Abstract
An amorphous MomO3m−1/carbon nanocomposite (m ≈ 5) is fabricated from a citrate–gel precursor heated at moderate temperature (500 °C) in inert (argon) atmosphere. The as-prepared Mo5O14-type/C material is compared to α-MoO3 synthesized from the same precursor in air. The morphology and microstructure of the as-prepared samples are characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), and Raman scattering (RS) spectroscopy. Thermal gravimetry and elemental analysis indicate the presence of 25.8 ± 0.2% of carbon in the composite. The SEM images show that Mo5O14 is immersed inside a honeycomb-like carbon matrix providing high surface area. The RS spectrum of Mo5O14/C demonstrates an oxygen deficiency in the molybdenum oxide and the presence of a partially graphitized carbon. Outstanding improvement in electrochemical performance is obtained for the Mo5O14 encapsulated by carbon in comparison with the carbon-free MoO3.
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Bauer D, Ashton TE, Brett DJ, Shearing PR, Matsumi N, Darr JA. Mixed molybdenum and vanadium oxide nanoparticles with excellent high-power performance as Li-ion battery negative electrodes. Electrochim Acta 2019. [DOI: 10.1016/j.electacta.2019.134695] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Reddy RKK, Kailasa S, Rani BG, Jayarambabu N, Yasuhiko H, Ramana GV, Rao KV. Hydrothermal approached 1-D molybdenum oxide nanostructures for high-performance supercapacitor application. SN APPLIED SCIENCES 2019. [DOI: 10.1007/s42452-019-1295-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
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Cho JS. Large Scale Process for Low Crystalline MoO₃-Carbon Composite Microspheres Prepared by One-Step Spray Pyrolysis for Anodes in Lithium-Ion Batteries. NANOMATERIALS (BASEL, SWITZERLAND) 2019; 9:E539. [PMID: 30987189 PMCID: PMC6523477 DOI: 10.3390/nano9040539] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/22/2019] [Revised: 03/26/2019] [Accepted: 03/27/2019] [Indexed: 01/31/2023]
Abstract
This paper introduces a large-scale and facile method for synthesizing low crystalline MoO₃/carbon composite microspheres, in which MoO₃ nanocrystals are distributed homogeneously in the amorphous carbon matrix, directly by a one-step spray pyrolysis. The MoO₃/carbon composite microspheres with mean diameters of 0.7 µm were directly formed from one droplet by a series of drying, decomposition, and crystalizing inside the hot-wall reactor within six seconds. The MoO₃/carbon composite microspheres had high specific discharge capacities of 811 mA h g-1 after 100 cycles, even at a high current density of 1.0 A g-1 when applied as anode materials for lithium-ion batteries. The MoO₃/carbon composite microspheres had final discharge capacities of 999, 875, 716, and 467 mA h g-1 at current densities of 0.5, 1.5, 3.0, and 5.0 A g-1, respectively. MoO₃/carbon composite microspheres provide better Li-ion storage than do bare MoO₃ powders because of their high structural stability and electrical conductivity.
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Affiliation(s)
- Jung Sang Cho
- Department of Engineering Chemistry, Chungbuk National University, Chungbuk 361-763, Korea.
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Fazio E, Speciale A, Spadaro S, Bonsignore M, Cimino F, Cristani M, Trombetta D, Saija A, Neri F. Evaluation of biological response induced by molybdenum oxide nanocolloids on in vitro cultured NIH/3T3 fibroblast cells by micro-Raman spectroscopy. Colloids Surf B Biointerfaces 2018; 170:233-241. [DOI: 10.1016/j.colsurfb.2018.06.028] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2017] [Revised: 05/07/2018] [Accepted: 06/15/2018] [Indexed: 12/18/2022]
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Puthusseri D, Wahid M, Ogale S. Conversion-type Anode Materials for Alkali-Ion Batteries: State of the Art and Possible Research Directions. ACS OMEGA 2018; 3:4591-4601. [PMID: 31458682 PMCID: PMC6641647 DOI: 10.1021/acsomega.8b00188] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/31/2018] [Accepted: 04/03/2018] [Indexed: 06/10/2023]
Abstract
In this study, the potential of conversion-type anode materials for alkali-ion batteries has been examined and analyzed in terms of the parameters of prime importance for practical alkali-ion systems. Issues like voltage hysteresis, discharge profile, rate stabilities, cyclic stabilities, irreversible capacity loss, and Columbic efficiencies have been specifically addressed and analyzed as the key subjects. Relevant studies on achieving a better performance by addressing one or more of the issues have been carefully selected and outlook has been presented on the basis of this literature. Mechanistic insights into the subject of conversion reactions are discussed in light of the use of recent and advanced techniques like in situ transmission electron microscopy, in operando X-ray diffraction, and X-ray absorption spectroscopy. Three-dimensional plots depicting the performance of different materials, morphologies, and compositions with respect to these parameters are also presented to highlight the systematic of multiparameter dependencies. Inferences are drawn from these plots in the form of a short section at the end, which should be helpful to the readers, especially young researchers. We believe that this study differs from others on the subject in being focused toward addressing the practical limitations and providing possible research directions to achieve the best possible results from conversion-type anode materials.
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Affiliation(s)
- Dhanya Puthusseri
- Department
of Physics and Centre for Energy Science and Department of Chemistry and Centre
for Energy Science, Indian Institute of
Science Education and Research (IISER), Pune, Dr. Homi Bhabha Road, Pashan, Pune 411008, India
| | - Malik Wahid
- Department
of Physics and Centre for Energy Science and Department of Chemistry and Centre
for Energy Science, Indian Institute of
Science Education and Research (IISER), Pune, Dr. Homi Bhabha Road, Pashan, Pune 411008, India
| | - Satishchandra Ogale
- Department
of Physics and Centre for Energy Science and Department of Chemistry and Centre
for Energy Science, Indian Institute of
Science Education and Research (IISER), Pune, Dr. Homi Bhabha Road, Pashan, Pune 411008, India
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Zhao X, Zhao Y, Yang Y, Liu Z, Wang HE, Sui J, Cai W. Fresh MoO2 as a better electrode for pseudocapacitive sodium-ion storage. NEW J CHEM 2018. [DOI: 10.1039/c8nj03570a] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A freshly prepared MoO2 anode with dominant pseudocapacitive sodium-ion storage has been developed for high-rate sodium ion batteries.
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Affiliation(s)
- Xu Zhao
- National Key Laboratory Precision Hot Processing of Metals
- Harbin Institute of Technology
- Harbin
- China
| | - Yundong Zhao
- National Key Laboratory Precision Hot Processing of Metals
- Harbin Institute of Technology
- Harbin
- China
| | - Ying Yang
- Key Laboratory of Applied Surface and Colloid Chemistry
- National Ministry of Education
- Shaanxi Key Laboratory for Advanced Energy Devices
- Shaanxi Engineering Lab for Advanced Energy Technology
- School of Materials Science & Engineering
| | - Zihang Liu
- National Key Laboratory Precision Hot Processing of Metals
- Harbin Institute of Technology
- Harbin
- China
| | - Hong-En Wang
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing
- Wuhan University of Technology
- Wuhan 430070
- China
| | - Jiehe Sui
- National Key Laboratory Precision Hot Processing of Metals
- Harbin Institute of Technology
- Harbin
- China
| | - Wei Cai
- National Key Laboratory Precision Hot Processing of Metals
- Harbin Institute of Technology
- Harbin
- China
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Sun Q, Bijelić M, Djurišić AB, Suchomski C, Liu X, Xie M, Ng AMC, Kong Li H, Shih K, Burazer S, Skoko Ž, Djerdj I, Popović J. Graphene-oxide-wrapped ZnMn 2O 4 as a high performance lithium-ion battery anode. NANOTECHNOLOGY 2017; 28:455401. [PMID: 29057755 DOI: 10.1088/1361-6528/aa8a5b] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Cation distribution between tetrahedral and octahedral sites within the ZnMn2O4 spinel lattice, along with microstructural features, is affected greatly by the temperature of heat treatment. Inversion parameters can easily be tuned, from 5%-19%, depending on the annealing temperature. The upper limit of inversion is found for T = 400 °C as confirmed by x-ray powder diffraction and Raman spectroscopy. Excellent battery behavior is found for samples annealed at lower temperatures; after 500 cycles the specific capacity for as-prepared ZnMn2O4 is 909 mAh g-1, while ZnMn2O4 heat-treated at 300 °C is 1179 mAh g-1, which amounts to 101% of its initial capacity. Despite the excellent performance of a sample processed at 300 °C at lower charge/discharge rates (100 mAh g-1), a drop in the specific capacity is observed with rate increase. This issue is solved by graphene-oxide wrapping: the specific capacity obtained after the 400th cycle for graphene-oxide-wrapped ZnMn2O4 heat-treated at 300 °C is 799 mAh g-1 at a charge/discharge rate 0.5 A g-1, which is higher by a factor of 6 compared to samples without graphene -oxide wrapping.
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Affiliation(s)
- Qian Sun
- Department of Physics, University of Hong Kong, Pokfulam Road, Hong Kong, People's Republic of China
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Iqbal S, Bahadur A, Saeed A, Zhou K, Shoaib M, Waqas M. Electrochemical performance of 2D polyaniline anchored CuS/Graphene nano-active composite as anode material for lithium-ion battery. J Colloid Interface Sci 2017; 502:16-23. [DOI: 10.1016/j.jcis.2017.04.082] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2017] [Revised: 04/23/2017] [Accepted: 04/26/2017] [Indexed: 12/01/2022]
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