Co-reporter:Yongjin Luo;Kuncan Wang;Jiachang Zuo;Yuxian Xu;Xinping Liu;Hun Xue;Qinghua Chen
Catalysis Science & Technology (2011-Present) 2017 vol. 7(Issue 2) pp:496-501
Publication Date(Web):2017/01/24
DOI:10.1039/C6CY02489K
La(OH)3 nanosheets have been successfully coated on electrospun LaCoO3 nanorods using a simple and facile corrosion process, where La cations are selectively precipitated using NaOH. During the oxidation process, La(OH)3 is converted to La2O3 having a mutual effect with the spontaneously generated Co3O4 and the predominant LaCoO3 component. The performances for catalytic benzene oxidation and characterization results indicate that the alkaline treatment of electrospun LaCoO3 can improve the apparent catalytic activity because more surface adsorbed oxygen species and exposed Co3+ are generated. However, if the treatment time reaches 9 h, over-deposition of La(OH)3/La2O3 species on the surface may cause a large fraction of active Co species to be inaccessible, resulting in a lower specific activity (2.9 × 10−6 molC6H6 m−2 h−1) compared to that of untreated LaCoO3 (4.8 × 10−6 molC6H6 m−2 h−1). A treatment time of 3 h provides the highest specific activity, 1.01 × 10−5 molC6H6 m−2 h−1. Moreover, the obtained catalyst shows deactivation of only 3% benzene conversion in a stability test at 450 °C for 48 h. Therefore, NaOH-treated LaCoO3 is a promising catalyst for the practical removal of volatile organic compounds due to its high efficiency, good stability, and convenient preparation.
Co-reporter:Lingxing Zeng;Xi Chen;Renpin Liu;Liangxu Lin;Cheng Zheng;Lihong Xu;Fenqiang Luo;Qinghua Chen;Mingdeng Wei
Journal of Materials Chemistry A 2017 vol. 5(Issue 44) pp:22997-23005
Publication Date(Web):2017/11/14
DOI:10.1039/C7TA06884K
In the present work, we designed a dual-spatial carbon protection strategy for a Se reservoir, in which a Se/hierarchical porous carbon fiber (Se/HPCF) composite was homogeneously anchored on reduced graphene oxide (Se/HPCF–rGO). HPCF with high specific surface area and large pore volume was synthesized for the first time by using sodium lignosulfonate (LN) as a green porogen based on an electrospinning route. The Se/HPCF–rGO composite exhibits excellent electrochemical performance when employed as a cathode material for Li–Se batteries. For instance, a high reversible capacity of 616 mA h g−1 was maintained after 50 cycles at a rate of 0.2C. More importantly, the Se/HPCF–rGO composite delivered a high capacity of 208 mA h g−1 at a high rate of 10C even after 5000 cycles. The outstanding electrochemical performance can be attributed to the synergistic effect of the diverse structural features and fast reaction kinetics for lithium storage.
Co-reporter:Yongjin Luo;Yuxian Xu;Xinping Liu;Hun Xue
Journal of Materials Science 2017 Volume 52( Issue 3) pp:1265-1271
Publication Date(Web):2017 February
DOI:10.1007/s10853-016-0421-7
The fast recombination of photo-generated conduction band electrons (ecb−) and valance band holes (hvb+) of TiO2 results in an unsatisfactory photocatalytic performance for organic degradation. To increase the efficiency of charge separation, TiO2 was modified by Cu–Ce co-doping considering the better redox properties of copper–ceria oxide with respect to the single oxide, i.e., an easier electron capturing ability. An optimal Cu–Ce co-doped TiO2 with the initial molar ratio of Cu/Ce at 3:1 was prepared by a hydrothermal method with the aim to greatly promote the charge separation, and characterized by XRD, BET, DRS, PL, HR-TEM, and XPS techniques. Upon ultraviolet light irradiation, it exhibits significantly enhanced photocatalytic activity, about 5.8 times that of Ti–HF. The presence of Cu2+ and Ce3+/Ce4+ benefits electrons captured by molecular oxygen, while an increased hydroxyl groups upon Cu–Ce co-doping consume more holes, resulting in prolonged lifetime of photo-generated carriers. Moreover, it is proved that electron transfers preferably from conduction band (CB) of TiO2 to CB of CuO and then to nearby CeO2.
Co-reporter:Yuxian Xu;Zhuo Li;Xinping Liu;Yongjin Luo
Journal of Materials Science: Materials in Electronics 2017 Volume 28( Issue 12) pp:8596-8600
Publication Date(Web):12 March 2017
DOI:10.1007/s10854-017-6583-5
The color-tunable fluorescent LaOCl:Eu3+, Ce4+ nanofibers were successfully fabricated via an electrospinning combined with calcination route, in which PVA was employed as a template. XRD, TG–DTG results show that the heat-treatment of the nanofibers at 750 °C is enough to obtain highly crystallized LaOCl:Eu3+, Ce4+ samples. Scanning electron microscopy analysis indicates that LaOCl:Eu3+, Ce4+ nanofibers are composed of wafer nanograins with mean diameter of ~30 nm. Photoluminescence analysis shows that the luminescence intensity has changed with the varying Ce4+ doping content in LaOCl:Eu3+ nanofibers. Additionally, CIE chromaticity coordinates of LaOCl:5% Eu3+, x% Ce4+ nanofibers change from orange light region of (0.4997, 0.4828) and (0.5232, 0.4627) at x = 5.0 and 2.5 to red light region of (0.5661, 0.4251) at x = 1.7, then to orange light region of (0.5590, 0.4318) at x = 1.0, respectively. Hence the fluorescence color of LaOCl:Eu3+, Ce4+ nanofibers can be tuned by simply adjusting the Eu/Ce ratio, which is a promising candidate for application in LEDs.
Co-reporter:Lingxing Zeng, Xiaoxia Huang, Xi Chen, Cheng Zheng, Qingrong Qian, Qinghua Chen, and Mingdeng Wei
ACS Applied Materials & Interfaces 2016 Volume 8(Issue 1) pp:232
Publication Date(Web):December 14, 2015
DOI:10.1021/acsami.5b08470
Germanium-based nanostructures are receiving intense interest in lithium-ion batteries because they have ultrahigh lithium ion storage ability. However, the Germanium-based anodes undergo the considerably large volume change during the charge/discharge processes, leading to a fast capacity fade. In the present work, a Ge/GeO2-ordered mesoporous carbon (Ge/GeO2–OMC) nanocomposite was successfully fabricated via a facile nanocasting route by using mesoporous carbon as a nanoreactor, and was then used as an anode for lithium-ion batteries. Benefited from its unique three-dimensional “meso-nano” structure, the Ge/GeO2–OMC nanocomposite exhibited large reversible capacity, excellent long-time cycling stability and high rate performance. For instance, a large reversible capacity of 1018 mA h g–1 was obtained after 100 cycles at a current density of 0.1 A g–1, which might be attributed to the unique structure of the Ge/GeO2–OMC nanocomposite. In addition, a reversible capacity of 492 mA h g–1 can be retained when cycled to 500 cycles at a current density of 1 A g–1.Keywords: Ge/GeO2−OMC; lithium-ion batteries; long cycle life; nanocomposite; nanoreactor
Co-reporter:Changlin Cao;Lichao Liu;Qiangpin Li;Pingqin Chen;Qinghua Chen
Polymer Engineering & Science 2016 Volume 56( Issue 6) pp:643-649
Publication Date(Web):
DOI:10.1002/pen.24290
Wasted polytetrafluoroethylene fibers were recycled using high-energy ball milling technique, and the recylced polytetrafluoroethylene (r-PTFE) was employed to prepare nitrile rubber (NBR)/r-PTFE composites. The structure of r-PTFE and properties of NBR/r-PTFE composites were investigated by polarized optical microscope, laser particle size analyzer, differential scanning calorimetry, and scanning electron microscopy, respectively. The results show that increasing the milling time from 4 to 7 h leads to decreasing the average particle size, the degree of crystallinity and the number-average molecular weight of r-PTFE, whereas no obvious change is found by further prolonging the milling time. It is also clear that the NBR/r-PTFE composite with the r-PTFE obtained from a longer milling time possesses a higher mechanical and solvent resistance property. Compared with pure NBR, NBR/r-PTFE composites with r-PTFE for 7 h milling show a 21.9% increase in modulus at 300% and 27.8% decrease in swelling index. POLYM. ENG. SCI., 56:643–649, 2016. © 2016 Society of Plastics Engineers
Co-reporter:Lingxing Zeng, Xiaoxia Huang, Cheng Zheng, Qingrong Qian, Qinghua Chen and Mingdeng Wei
Dalton Transactions 2015 vol. 44(Issue 17) pp:7967-7972
Publication Date(Web):20 Mar 2015
DOI:10.1039/C5DT00673B
Hierarchical LiZnVO4@C nanostructures composed of thin nanobelt aggregates were synthesized for the first time through an ethanol thermal and subsequent annealing route, and were investigated by X-ray diffraction (XRD), thermogravimetric analysis (TGA), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Furthermore, the synthesized hierarchical nanostructures were used as anode materials for Li-ion intercalation and exhibited a large reversible capacity, high rate performance, and excellent cycling stability. For instance, a high reversible capacity of 675 mA h g−1 was maintained after 60 cycles at a current density of 50 mA g−1. These results might be attributed to the following facts: (i) the hierarchical nanostructures could buffer the strain and volume changes during the cycling process; (ii) the thin nanobelts provide a shortened distance for Li-ion intercalation; (iii) the thin carbon layer on the surface of the nanobelts could provide a fast route for electron transportation, leading to an improved capacity and high rate performance.
Co-reporter:Yongjin Luo, Kuncan Wang, Yuxian Xu, Xiuyun Wang, Qingrong Qian and Qinghua Chen
New Journal of Chemistry 2015 vol. 39(Issue 2) pp:1001-1005
Publication Date(Web):13 Nov 2014
DOI:10.1039/C4NJ01500B
CuO–CeO2 nanofibers with relatively high surface area (EL-CuCe) have been successfully prepared by the electrospinning method and investigated for total benzene oxidation. The improved low-temperature performance of EL-CuCe compared to ST-CuCe (prepared by the surfactant-templated method) is attributed to the better reducibility of Cu ions that are incorporated into the ceria lattice. Moreover, more oxygen vacancies and weakly bound oxygen species (e.g., O2−, O22− or O−) observed on EL-CuCe keep in step with its higher low-temperature oxidation activity. However, without small amounts of bulk CuO, reduction of some surface ceria occurs at 480 °C for EL-CuCe, which probably accounts for its unsatisfactory high temperature performance.
Co-reporter:Xinping Liu, Yanying Chen, Changlin Cao, Jing Xu, Qingrong Qian, Yongjin Luo, Hun Xue, Liren Xiao, Yuming Chen and Qinghua Chen
New Journal of Chemistry 2015 vol. 39(Issue 9) pp:6944-6950
Publication Date(Web):01 Jul 2015
DOI:10.1039/C5NJ01333J
Nitrogen and carbon co-doped porous TiO2 nanofibers (NCPTNs) were exploited by a combination of electrospinning and controlled calcination technologies. Polyvinyl pyrrolidone (PVP) was employed both as a template and as a nitrogen and carbon source. It is clear that the prepared NCPTNs exhibit high absorption in the visible light region, suggesting that the co-doping of nitrogen and carbon onto TiO2 not only leads to a shift of the absorption edge to lower energy by inducing new band levels, but also creates large amounts of single-electron-trapped oxygen vacancy. Besides, the porous structure and high surface area provide large active points for the photodecomposition reaction of methylene blue. Moreover, the NCPTN obtained in 5 wt% urea shows the highest photocatalytic activity for methylene blue decomposition under the visible light irradiation.
Co-reporter:Yongjin Luo, Kuncan Wang, Qingrong Qian, Weiwei Zheng, Hun Xue, Baoquan Huang, Liren Xiao, Qinghua Chen
Materials Letters 2015 Volume 149() pp:70-73
Publication Date(Web):15 June 2015
DOI:10.1016/j.matlet.2015.02.126
•Gd-doped ZnO nanorods composed of nanoparticles were synthesized.•Photocatalytic performances can be simply varied by governing calcination time.•Residual carbon, crystallinity and nanoparticle size are key factors.Gd-doped ZnO nanorods composed of nanoparticles were synthesized via an electrospinning combined with calcination route. It is revealed that the Gd-doped ZnO catalyst calcined at 500 °C for a time of 7 h shows the best photodegradation activity. A short calcination time of 1 h gives rise to large amounts of residual carbon and low crystallinity of ZnO, which are adverse for charge separation. Increasing calcination time to 3 h or 5 h, suitable amounts of residual carbon that favors charge transfer plays a greater role than crystallinity. When the calcination time is further prolonged to 9 h, a growth of nanoparticle size leads to a decreased photocatalytic performance. Thus, the efficiency for degradation activity is determined by the combinational effects of residual carbon, crystallinity and nanoparticle size.
Co-reporter:Yongjin Luo, Xiuyun Wang, Qingrong Qian, Qinghua Chen
International Journal of Hydrogen Energy 2014 Volume 39(Issue 28) pp:15836-15843
Publication Date(Web):23 September 2014
DOI:10.1016/j.ijhydene.2014.07.135
•A series of LaNi1−xFexO3 were prepared and investigated for H2-SCR.•Fe-doping leads to a better NOx removal and a high structural stability.•Easy reduction of Ni3+ to Ni2+ is crucial, and sulfates mainly deposit on Ni.•Fe addition can protect Ni to some extent at the expense of partial sulfation.A series of LaNi1−xFexO3 (x = 0.0, 0.2, 0.4, 0.7, and 1.0) perovskites were synthesized and characterized by X-ray diffraction (XRD), N2 physisorption, scanning electron microscopy (SEM), H2-temperature-programmed reduction (H2-TPR), and X-ray photoelectron spectroscopy (XPS). The perovskites were investigated for selective catalytic reduction of NOx by hydrogen (H2-SCR). It is shown that Fe addition into LaNiO3 leads to a promoted efficiency of NOx removal, as well as a high stability of perovskite structure. Moreover, easy reduction of Ni3+ to Ni2+ with the aid of appropriate Fe component mainly accounts for the enhanced activity. Meanwhile, deactivation of the sulfated catalysts is due to that sulfates mainly deposit on active Ni component while doping of Fe can protect Ni to some extent at the expense of partial sulfation.
Co-reporter:Wei Wei, Nan Wu, Jing Xu, Qinghua Chen, Qingrong Qian, Yongjin Luo, Xinping Liu, Liren Xiao, Baoquan Huang
Materials Letters 2014 Volume 126() pp:48-51
Publication Date(Web):1 July 2014
DOI:10.1016/j.matlet.2014.03.176
•Carbon nanofibers were fabricated from electrospun PVC fibers.•PVC-based carbon fibers with 50–100 nm in diameter possess graphitic nanoparticles.•The hydrogen storage capacity of the carbon nanofibers is 0.30 wt%.PVC-based carbon nanofibers with graphitic nanoparticles were fabricated by an electrospinning–carbonization technique and characterized by SEM, (HR)TEM and XRD. The hydrogen storage capability of the resultant nanofibers was evaluated using the volumetric method. The results show that the PVC-based carbon nanofibers obtained from the electrospun PVC/NiCl2 nanofibers consist of both amorphous carbon and a well-grown graphite layered sphere with a diameter of 35 nm. It is clear that the iodine treatment is essential for retaining a fibrous shape during the carbonization, and Ni is beneficial to the growth of graphitization at low temperatures. The hydrogen storage capacity of the PVC-based carbon nanofibers obtained at 1000 °C is 0.30 wt%, suggesting that the resultant nanofibers are a potential energy storage material.
Co-reporter:Xintu Lin;Huaji Zhang;Meizhen Ke;Liren Xiao;Dongqiang Zuo
Polymer Bulletin 2014 Volume 71( Issue 9) pp:2287-2301
Publication Date(Web):2014 September
DOI:10.1007/s00289-014-1187-1
The non-isothermal crystallization kinetics of pure poly(ethylene terephthalate) (PET), PET/mica and PET/TiO2-coated mica composites were investigated by differential scanning calorimetry with different theoretical models, including the modified Avrami method, Ozawa method and Mo method. The activation energies of non-isothermal crystallization were calculated by Kissinger method and Flynn–Wall–Ozawa method. The results show that the modified Avrami equation and Ozawa theory fail to describe the non-isothermal crystallization behavior of all composites, while the Mo model fits the experiment data fair well. It is also found that the mica and TiO2-coated mica could act as heterogeneous nucleating agent and accelerate the crystallization rates of PET, and the effect of TiO2-coated mica is stronger than that of mica. The result is further reinforced by calculating the effective activation energy of the non-isothermal crystallization process for all composites using the Kissinger method and the Flynn–Wall–Ozawa method.
Co-reporter:Jun Chen;Wei Wei;Liren Xiao;Xinping Liu;Jing Xu
Rheologica Acta 2014 Volume 53( Issue 1) pp:67-74
Publication Date(Web):2014 January
DOI:10.1007/s00397-013-0737-z
A multifunctional epoxide chain extender (ADR4370S) was used to increase the molecular weight of poly(trimethylene terephthalate) (PTT). And the effects of ADR4370S content on the molecular structure, melt viscosity, and rheological properties of PTT were studied. It is found that a star-type topological structure is formed in PTT by introduction of ADR4370S, and the balance torque, intrinsic viscosity, and molecular weight are increased by increasing ADR4370S dosage. The rheological measurement results show that the elastic modulus, complex viscosity, and shear thinning behavior of long-chain branching PTT are increased with the concentration of ADR4370S. The presence of broadened relaxation time spectrum and a long relaxation time mode for the PTT with 1.50 wt% ADR4370S demonstrate that the cross-linking reaction occurs, and the gel forms in the PTT system.
Co-reporter:Weiwei Zheng, Qingqing Miao, Yingmao Tang, Wei Wei, Jing Xu, Xinping Liu, Qingrong Qian, Liren Xiao, Baoquan Huang, Qinghua Chen
Materials Letters 2013 Volume 98() pp:94-97
Publication Date(Web):1 May 2013
DOI:10.1016/j.matlet.2013.02.004
La(III)-doped ZnO/C nanofibers with core–shell structure were prepared by calcination of electrospun PAN(polyacrylonitrile)/La(NO3)3/Zn(Ac)2 composite nanofibers and characterized by XRD, FESEM, (HR)TEM, and EDS respectively. The photocatalytic activity of La(III)-doped ZnO/C nanofibers in the decomposition of RhB under UV–lamp light irradiation was also investigated. The results show that the prepared composite fibers possess a rough surface and flower-like morphology with diameters from 50 to 100 nm and exhibit high photocatalytic activity in the decomposition of RhB solution. It is also found that the La(III) doping concentration plays an important role in photocatalytic performance during the degradation reaction of RhB. 2% La(III) is suggested to be the optimum doping dosage.Highlights► La-doped ZnO/C nanofibers are fabricated by electrospinning–calcination technology. ► La-doped ZnO/C nanofibers exhibit high photocatalytic activity for RhB degradation. ► 2% La3+ is found to be the optimum doping dosage.
Co-reporter:Xiaoyan Li, Yuming Chen, Qingrong Qian, Xinping Liu, Liren Xiao, Qinghua Chen
Journal of Luminescence 2012 Volume 132(Issue 1) pp:81-85
Publication Date(Web):January 2012
DOI:10.1016/j.jlumin.2011.07.003
An electrospinning–calcination strategy was established to fabricate Y2O3 nanofibers doped with rare earth ions (Tb, Sm and Dy) using electrospun PVA/RE(NO3)x/Y(NO3)3 composite nanofibers as precursors (x=3.4). The prepared nanofibers were characterized by XRD, FESEM, EDS, (HR)TEM and PL analyses. Based on the experimental results, a solid–solid growth mechanism (SS) was proposed to describe the formation of inorganic crystalline fibers from organic/inorganic composite nanofibers by calcination. It was determined that carbonaceous nanoparticles that were formed in the process of pre-carbonization adsorbed Y2O3:RE nanoparticles to grow Y2O3:RE crystal, and the resultant nanofibers exhibited a typical crystalline domain with grain boundary. The obtained Y2O3:RE nanofibers possessed excellent luminescent characteristics and could be used as an appreciable luminescent material.Highlights► Fabricate Y2O3:RE fibers by the calcination of electrospun PVA/Y(NO3)3/RE(NO3)3 composite nanofibers. ► Prepared Y2O3:RE nanofibers display more intensive photoluminescence performance than the bulk materials. ► Propose a solid–solid growth mechanism for the formation of inorganic crystalline fibers via calciation.
Co-reporter:Hai Wang;Xia Jiang;Xinping Liu;Liren Xiao;Baoquan Huang ;Qinghua Chen
Journal of Applied Polymer Science 2012 Volume 126( Issue S1) pp:E266-E272
Publication Date(Web):
DOI:10.1002/app.36984
Abstract
In this study, a series of maleic anhydride (MA)-grafted poly(acrylonitrile-butadiene-styrene) (ABS-g-MAH) were prepared via a melt banbury process on a RM-200B torque rheometer and used as a compatibilizer for recycled poly(ethylene terephthalate)/poly(acrylonitrile-butadiene-styrene) (R-PET/ABS) blends. The melt rheological and compatibility properties of R-PET/ABS blends were investigated. It had been found that 5 wt % of MA was an optimum concentration for the preparation of ABS-g-MAH. About 1 wt % of ABS-g-MAH prepared at the MA optimum conditions shows good compatibility for the basic blend of R-PET/ABS 85/15 w/w. Rheological and SEM characterizations confirmed that the phase reversal of blends occurred at R-PET/ABS ratio of 75/25 w/w. DMA results indicated that R-PET was partially miscible with ABS, and ABS-g-MAH was an efficient compatibilizer for R-PET/ABS blends. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012
Co-reporter:Liren Xiao;Hai Wang;Xia Jiang;Xinping Liu;Baoquan Huang ;Qinghua Chen
Polymer Engineering & Science 2012 Volume 52( Issue 10) pp:2127-2133
Publication Date(Web):
DOI:10.1002/pen.23175
Abstract
A multifunctional epoxide chain extender (ADR4370S) was used to increase the molecular weight of recycled poly(ethylene terephthalate) (R-PET). The extension processing was carried out by melt mixing reaction. The effects of ADR4370S content on the molecular structure [molecular weight, molecular weight distributions (MWDs), branching, and gel-like structures] of modified R-PET were rheologically investigated. The results showed that the complex and apparent viscosity of the modified R-PET were larger than those of unmodified one. The solid-like behavior of R-PET was enhanced after the reactive modification. The increments of balancing torque, reaction peak, and shear-thinning behavior became more pronounced by increasing the concentration of ADR4370S. Reactive modification was characterized by the presence of long-chain branching resulted in a wider MWD. Modified Cole–Cole plots demonstrated a shift toward higher storage modulus values at a given loss modulus value for the modified R-PET samples. High concentration of ADR4370S (>1.5 wt%) resulted in a polymeric structure near the sol–gel transition point whose linear viscoelastic properties obeyed scaling law. The relaxation time was prolonged with the amount of ADR4370S increase. The decrease in the melt point and crystallization temperature of the modified R-PET was correlated to the presence of chain branching. POLYM. ENG. SCI., 2012. © 2012 Society of Plastics Engineers
Co-reporter:Xiaoyan Li, Qingrong Qian, Weiwei Zheng, Wei Wei, Xinping Liu, Liren Xiao, Qinghua Chen, Yuming Chen, Feifeng Wang
Materials Letters 2012 80() pp: 43-45
Publication Date(Web):
DOI:10.1016/j.matlet.2012.04.030
Co-reporter:Lingxing Zeng, Xiaoxia Huang, Cheng Zheng, Qingrong Qian, Qinghua Chen and Mingdeng Wei
Dalton Transactions 2015 - vol. 44(Issue 17) pp:NaN7972-7972
Publication Date(Web):2015/03/20
DOI:10.1039/C5DT00673B
Hierarchical LiZnVO4@C nanostructures composed of thin nanobelt aggregates were synthesized for the first time through an ethanol thermal and subsequent annealing route, and were investigated by X-ray diffraction (XRD), thermogravimetric analysis (TGA), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Furthermore, the synthesized hierarchical nanostructures were used as anode materials for Li-ion intercalation and exhibited a large reversible capacity, high rate performance, and excellent cycling stability. For instance, a high reversible capacity of 675 mA h g−1 was maintained after 60 cycles at a current density of 50 mA g−1. These results might be attributed to the following facts: (i) the hierarchical nanostructures could buffer the strain and volume changes during the cycling process; (ii) the thin nanobelts provide a shortened distance for Li-ion intercalation; (iii) the thin carbon layer on the surface of the nanobelts could provide a fast route for electron transportation, leading to an improved capacity and high rate performance.
Co-reporter:Yongjin Luo, Kuncan Wang, Jiachang Zuo, Qingrong Qian, Yuxian Xu, Xinping Liu, Hun Xue and Qinghua Chen
Catalysis Science & Technology (2011-Present) 2017 - vol. 7(Issue 2) pp:NaN501-501
Publication Date(Web):2016/12/20
DOI:10.1039/C6CY02489K
La(OH)3 nanosheets have been successfully coated on electrospun LaCoO3 nanorods using a simple and facile corrosion process, where La cations are selectively precipitated using NaOH. During the oxidation process, La(OH)3 is converted to La2O3 having a mutual effect with the spontaneously generated Co3O4 and the predominant LaCoO3 component. The performances for catalytic benzene oxidation and characterization results indicate that the alkaline treatment of electrospun LaCoO3 can improve the apparent catalytic activity because more surface adsorbed oxygen species and exposed Co3+ are generated. However, if the treatment time reaches 9 h, over-deposition of La(OH)3/La2O3 species on the surface may cause a large fraction of active Co species to be inaccessible, resulting in a lower specific activity (2.9 × 10−6 molC6H6 m−2 h−1) compared to that of untreated LaCoO3 (4.8 × 10−6 molC6H6 m−2 h−1). A treatment time of 3 h provides the highest specific activity, 1.01 × 10−5 molC6H6 m−2 h−1. Moreover, the obtained catalyst shows deactivation of only 3% benzene conversion in a stability test at 450 °C for 48 h. Therefore, NaOH-treated LaCoO3 is a promising catalyst for the practical removal of volatile organic compounds due to its high efficiency, good stability, and convenient preparation.
