JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Wenyu Wang,Yu Feng,Shuaiguo Zhang,Miao Wang,Wei Song,Luchao Yue,Mingzheng Ge,Jie Mi
Premixed flame configuration is considered as an effective method for the synthesis of carbon materials. In this work, flexible single-walled carbon nanotube network decorated by carbon-encapsulated Fe 2 O 3 nanoparticles (C@Fe 2 O 3 /SWCNT) membrane was in-situ fabricated via a facile floating catalyst premixed ethanol flame method, and followed by annealing treatment. In this process, low-cost ethanol and ferrocene were used as carbon source and catalyst precursor for the synthesis of C@Fe 2 O 3 /SWCNT, respectively. Benefiting from the interconnected conductive network, the as-fabricated C@Fe 2 O 3 /SWCNT membrane was used as a free-standing anode for lithium-ion batteries. Structural characterization revealed that the ultrafine Fe 2 O 3 nanoparticles homogeneously anchored on the SWCNT network, which facilitates the fast diffusion for electron. Furthermore, the carbon layers uniformly enwrap on Fe 2 O 3 can effectively suppress the aggregation and buffer the volume change of Fe 2 O 3 during the lithiation/delithiation process. Consequently, this material delivered an excellent lithium storage performance with a high reversible capacity of 1294.7 mAh g −1 at 50 mA g −1 , and an excellent cyclability of 82.5% retention is obtained after cycles at 2 A g −1 . This study provides a novel low-cost and fast method for preparing flexible advanced electrode for next-generation rechargeable batteries.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
JOURNAL OF THE ENERGY INSTITUTE
·
2025
·
IF 6.2
Weiqi Chen,Tingting Xu,Runtian Yu,Zhimei Shu,Jiayi Xiao,Dong Liu
Flame synthesis of oxygen carriers (OCs) with specific functions remains challenging. In this study, the brownmillerite Ca 2 Fe 2 O 5 OCs properties are precisely regulated by adjusting the type of ester solvent, oxygen concentration, and carrier gas flow rate during diffusion flame synthesis. The utilization of flame-synthesized OCs in the chemical looping reforming coupled with water splitting (CLRWS) to produce syngas and hydrogen has been elucidated. At a high oxygen concentration (60 % O 2 ), OCs synthesized using propyl propionate solvent aerosol flame, yielding 33 nm polycrystalline particles, exhibit exceptional performance with an 82.6 % fuel conversion rate, 3.09 Nm 3 /L syngas yield, and 11.16 mmol/g OC hydrogen yield at 850 °C, surpassing classical methods. The high reduction capacity and lattice oxygen activity can be attributed to the multiple exposed crystal faces and active sites. This study aimed at regulating and producing OCs with excellent activity for biomass utilization and catalysis.
研究领域:
材料科学
·
能源化学
·
催化化学
·
化学工程
·
纳米材料
·
可再生能源
·
多相催化
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Jing Lei,Wei Bi,Mitang Wang,Hao Jiang,Yanjie Hu,Chunzhong Li
How to achieve controllable preparation of heterostructure and in-situ optimize the interface and internal electron transfer by a fast and economic synthesis method has become a big challenge in the practical application of photocatalysis. Herein, an island-shaped SrTiO 3 (STO) perovskite nanodots and TiO 2 (T) compounded S-scheme SrTiO 3 /TiO 2 (ST) heterostructure was successfully developed. During the millisecond reaction process, the decomposed Sr 2+ penetrated into the TiO 2 lattice causing the lattice expansion and inducing local atomic rearrangements, resulting in the generation of STO phase. Owing to the synergy of the efficient electron transport at the perovskite nanodots interface and the stronger reduction capacity, the performance of the optimized ST1 sample is greatly improved to 86.90 μmol g −1 for CO 2 -to-CO and 21.31 μmol g −1 for CO 2 -to-CH 4 . The utilization of electrons reached up to 119.74 μmol g −1 h −1 , which was 3.13 times higher than that of T. Detailed characterizations and density functional theory (DFT) calculations proof that the formation of intermediates HCOO − and CO 3 2− is the key to the performance improvement critically. Overall, this work originally reports a feasible strategy for flame synthesis of S-scheme heterostructure photocatalyst.
研究领域:
光催化
·
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanomaterials
·
2020
·Vol. 10
·期 8
·1475
·
IF 4.324
Xiaofan Zhao,Zeyun Wu,Zining Yang,Xu Yang,Yiyang Zhang,Maohui Yuan,Kai Han,Changqing Song,Zongfu Jiang,Hongyan Wang,Shuiqing Li,Xiaojun Xu
Er3+-sensitized upconversion nanoparticles (UCNPs) have attracted great attention due to their tunable upconversion (UC) emissions, low cytotoxicity, high resistance to photobleaching and especially multiple effective excitation wavelengths. However, detailed energy conversion between Er3+and Tm3+ions in Y2O3UCNPs is still a problem, especially under multi-wavelength and variable pulse width excitation. In this work, we successfully fabricated a series of Er3+-sensitized Y2O3nanocrystals by a spray flame synthesis method with a production rate of 40.5 g h−1. The as-prepared UCNPs are a pure cubic phase with a mean size of 14 nm. Excited by both 980 and 808 nm lasers, the tunable upconversion luminescence (UCL) from Er3+ions was achieved by increasing the Er3+doping concentration, co-doping Tm3+ions and extending excitation pulse-width. The investigations of the lifetimes and the laser power dependence of UC emissions further support the proposed mechanism, which provides guidance for achieving effective color control in anticounterfeiting and multiplexed labeling applications. In addition, the red UC emission at about 5 mm beneath the tissue surface was observed in an ex vivo imaging experiment under the excitation of 808 nm laser, indicating that the Y2O3:Er3+/Tm3+UCNPs have great prospects in further biological applications.Keywords:multicolor tuning;dual-wavelength excitation;upconversion luminescence;spray flame synthesis;Y2O3nanocrystal;biological applications
研究领域:
材料科学
·
光学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PROCEEDINGS OF THE COMBUSTION INSTITUTE
·
2024
·
IF 5.3
Shuting Lei,Yiyang Zhang,Zhu Fang,Tianyi Wu,Xing Jin,Shuiqing Li
For applications in optics, energy storage, and semiconductors etc., spherical non-aggregated particles are desired for better flowability , molding capability and homogeneous densification . Spray flame synthesis has attracted widespread attention with its excellent ability for atomic-level mixing/doping and good potential for scale-up production. However, spray flame synthesis usually produces aggregates due to the known collision-coalescence growth. In this paper, we propose a two-step strategy of suspension-fed spray-flame synthesis. The first step involves the synthesis of aggregated nanoparticles , followed by a second step where these aggregates are reconstructed into spherical non-aggregated particles while retaining the advantage of atomic-level homogeneous mixing. It is found that for aggregated Y 2 O 3 nanoparticles , the critical point for reconstructing into spherical particles occurs when the flame temperature exceeds the melting point. The spherical particle size increases with the solid concentration of the suspension by a power of about 0.28. Assuming that droplets do not undergo micro-explosions and instead follow a one droplet to one particle route results in an overestimation of particle size by a factor of 6 to 8. This discrepancy suggests that micro-explosions may play certain role in the new suspension-fed flame synthesis, and largely reduces the final particle size. Furthermore, the Al 2 O 3 -Y 2 O 3 and MgO-Y 2 O 3 particles are selected for the multicomponent suspension-fed synthesis, representing the miscible and immiscible systems, respectively. The results show that for the Al 2 O 3 -Y 2 O 3 system, uniformly mixed spherical non-aggregated particles are obtained. For the MgO-Y 2 O 3 system, both composite spherical particles with pinning structure and MgO nanoparticles are identified, indicating that for obtaining spherical multi-component non-aggregated particles, the flame temperature needs to be higher than not only the eutectic component's melting point but also any single component's melting point. Overall, suspension-fed spray flame synthesis opens up a new pathway for the low-cost industrial-scale production of spherical non-aggregated multi-component particles.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF AEROSOL SCIENCE
·
2025
·
IF 2.9
Shuting Lei,Yiyang Zhang,Zhu Fang,Xing Jin,Shuiqing Li
Spray flame synthesis has proven to be a promising method for the high-throughput production of multi-component nanoparticles with atomic-level mixing. However, the fast dynamic of flame synthesis presents significant challenges in precisely controlling the morphology and crystalline phase of the particles, especially for multi components. In this paper, we conduct parametric flame synthesis experiments to identify key factors affecting nanoparticle morphology and crystal phase of Y-Al nanoparticles, focusing on the effects of Y/Al atomic ratio, flame temperature, and precursor volatility. The results indicate that the particle morphology depends on the composition, changing from aggregates with sintering necks to spherical particles without sintering necks and back to aggregates as the Al content increases. This trend is consistent with the change in particle melting points, which initially decrease and then rise again. Thus, the variation in melting point causes changes in sintering time, which in turn affect the particle morphology. The particle crystalline phase gradually deviates from the target phase as the Al content increases. Raising the adiabatic flame temperature from 1551 °C to 2340 °C accelerates the diffusion of Al atoms into the lattice, increasing the target phase proportion in the synthesized particles from 66 % to 99 %. By adjusting the amount of 2-ethylhexanoic acid (EHA) added, the volatility differences between the precursors can be modified. The largest discrepancy in precursor volatility is observed when EHA was added at a 50 % equivalence ratio, resulting in only 6 % of the target phase YAH (YAlO 3 , hexagonal type) in the particles. Increasing the EHA addition to 120 % equivalent results in better matching of precursor volatilities, which leads to a significant increase in the target YAH phase to 98 %, demonstrating the critical role of simultaneous evaporation of different component precursors.
研究领域:
材料科学
·
纳米技术
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
PROCEEDINGS OF THE COMBUSTION INSTITUTE
·
2020
·
IF 5.627
Zeyun Wu,Yiyang Zhang,Xiaofan Zhao,Hongyan Wang,Shuiqing Li
Yttrium aluminum oxide YAlO 3 is an attractive laser host material for lanthanide ions like Nd 3+ . In this paper, a dual liquid/vapor-fed flame synthesis (DLVF) system is developed for investigating the role of SiO 2 coating on flame-made YAlO 3 :Nd 3+ nanophosphors. The hexamethyldisiloxane (HDMSO) vapor is flexibly fed into the YAlO 3 :Nd 3+ flame spray flow at different positions and molar ratios . We find that the introduction of SiO 2 coating dramatically improves the crystallinity of YAlO 3 :Nd 3+ cores because of the heat-insulation effect and nearly doubles the fluorescence intensity . Through a timescale analysis, we demonstrate that the best timing for coating injection is when the small particles have already been formed but not heavily aggregated. An early injection could result in segregated SiO 2 particles and some impurities like Al 2 SiO 5 , while a delayed injection leads to the coating of SiO 2 on the entire aggregates instead of on individual particles. Experiments of different coating ratios show that the coating ratio 1:1 of Si:(Y+Nd) produces the best crystallinity and strongest fluorescence intensity. Further increase of the coating ratio does not show any improvements of the crystallinity , and may even causes the decrease of the relative fraction of Nd 3+ ions. Compared with YAG:Nd 3+ bulk materials (with a typical optimum doping concentration 1.1mol%) and uncoated YAlO 3 :Nd 3+ nanophosphors (with an optimum doping concentration 2 mol%), the SiO 2 coating promotes the optimum Nd 3+ doping concentration up to 3 mol%.
研究领域:
材料科学
·
无机化学
·
纳米技术
·
发光材料
·
激光增益介质
✓ 已验证
DOI
高影响因子
JOURNAL OF AEROSOL SCIENCE
·
2019
·
IF 2.24
Jili Wei,Yihua Ren,Yiyang Zhang,Baolu Shi,Shuiqing Li
This work examines the effect of temperature-time history on the flame synthesis of titania nanoparticles using a specially designed swirl-stabilized tubular burner with two kinds of precursor feeding modes, the tangential inlet and the central jet inlet. When the Damköhler number is less than unity, a rapidly mixed type tubular flame is well-formed, which is chosen to be the condition for flame synthesis. The ex situ characterization of the synthesized TiO 2 nanoparticles shows that the particle samples from the tangential inlet feeding mode are mainly anatase (up to 84.3%) with a mean primary particle size of 13.0 ± 3.2 nm, whereas those from the central jet inlet feeding mode are large polydisperse rutile (up to 74%) nanoparticles with a mean size of 16.9 ± 8.8 nm. The significant differences in particle size and crystal phase are attributed to the varied temperature-time histories of two feeding modes, as the residence time of nanoparticles in high-temperature zone of the central jet inlet mode is much longer with larger variation than that of the tangential inlet feeding mode. Finally, the well-dispersed Pd/TiO 2 nanocatalysts are generated by elaborately feeding palladium acetate through the central jet inlet and titanium tetraisopropoxide through the tangential inlets, respectively, to better match the temperature-time histories with the decomposition properties of two different precursors. The study demonstrates the potential of this swirl-stabilized burner for producing tailored single- and multi-component nanomaterials for a variety of applications.
研究领域:
材料科学
·
纳米技术
·
燃烧化学
·
催化材料
·
热力学过程
·
功能纳米材料
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2023
·Vol. 52
·期 7
·4951-4958
·
IF 2.1
Mu Guili,Zhou Jinglin,Ye Beirong,Zhang Tengfei,Li Chen,Zhao Qiang
The development of efficient, long-lasting, low-cost, and environment friendly electrocatalysts for oxygen evolution reactions (OER) is imminent in many energy storage and conversion devices. Here, a unique electrocatalyst of Fe-doped Co 3 O 4 particles loaded on carbon nanotubes (Fe-doped Co 3 O 4 /CNT/NF) was synthesized by a one-step flame method. This method significantly reduces the reaction time (the whole flame process just maintain ~ 10 s). The doping of iron significantly enhances the activity of the OER, as demonstrated by a reduced overpotential of 232 mV to achieve 10 mA cm −2 , a tiny Tafel slope (34.1 mV dec −1 ), and long-lasting durability in an alkaline electrolyte. This work provides a potential possibility for large-scale industrial production. Graphical Abstract The carbon nanotubes attached with Fe-doped and Co 3 O 4 nanoparticles were generated in situ by a simple and reliable one-step flame method. Fe-doped and Co 3 O 4 nanoparticles were immobilized on the surface of the carbon nanotubes, resulting in Co being able to expose more active edges. As a result, the newly designed Fe-doped Co 3 O 4 /CNT/NF exhibits lower overpotential and Tafel slope. The low cost of the basic materials in this design and the easy and fast preparation method ensure that it can be produced on a large scale.
研究领域:
材料科学
·
电化学
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2017
·Vol. 164
·期 12
·A2823
·
IF 3.259
Wei Zeng,Yuqiao Xie,Liangwu Sun,Ning Wei,Limin Ruan,Dong Liang,Nian Wang,Chao Xu,Linsheng Huang
Nanocarbons in a unique spring-like helical structure were prepared by a simple and low-cost flame combustion method to act as active and conductive nano-springs in constructing a mattress-like graphene-based paper as a flexible freestanding electrode. As the electrode is applied in a supercapacitor, it simultaneously exhibits high activity, cycling and mechanical stability owing to its unique structure. At a working current density of 0.2 mA cm−2, the areal capacitance of this electrode is as high as 1.07 F cm−2, which is 228% higher than that of the electrode without the helical interlayer. In addition, the capacitive retention of the electrode reaches 93.02% after 1000 charge-discharge cycles at a current density of 2 mA cm−2, and it can remain at 81.22% even if the electrodes are bent 120° in a symmetrical supercapacitor. Such a preparation route is simple and effective, which makes it a promising method for fabricating general spring-like nanomaterials for high-performance wearable electronic devices.
研究领域:
材料科学
·
纳米技术
·
能源存储
·
电化学
✓ 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）