COMPOSITES PART B-ENGINEERING
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2022
·
IF 11.322
Kedi Cai,Tan Wang,Zhenhua Wang,Jiajun Wang,Lan Li,Chuangang Yao,Xiaoshi Lang
Lithium-sulfur (Li–S) batteries are considered to be promising next-generation rechargeable system. However, the shuttle effect for lithium polysulfides (LiPSs) and slow sulfur reaction kinetics due to multistep phase transitions severely limit the practical application of Li–S batteries. Herein, via dual-strategy of heterogeneous interface and defect engineering, a cocklebur-like sulfur host with the TiO 2 -VO x heterostructure (CTVHs) for long-life Li–S batteries is fabricated, and atomic-level clarification of the chemical interaction between the substrate and LiPSs from a theoretical viewpoint is achieved. Benefiting from the heterostructure, the high adsorption energy heterojunction interface works as capturing centers to trap LiPSs which ensures rapid diffusion to VO x . In addition, the defect-rich spiny VO x is endowed with high catalytic activity towards LiPSs and fast lithium-ion migration so as to effectively implement one-step adsorption diffusion transformation. DFT calculations show that the introduction of a heterostructure can change the electronic structure, thereby improving the adsorption capacity of CTVHs. Electrochemical measurements reveal favorable kinetics for Li 2 S deposition, better cyclability, and an outstanding discharge capacity. The CTVHs/S cathode delivers a slow capacity decay rate of 0.029% per cycle and achieves nearly 100% coulombic efficiency (CE) at 0.5 C over 1400 cycles. This proposed strategy provides broad prospects to promote the adsorption-conversion of LiPSs for long-life Li–S batteries.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Jiaxi Sui,Dongdong Liu,Chunyu Wang,Lijuan Wang,Bo Zhong,Yuanyuan Ma
Non-metallic Surface-Enhanced Raman Scattering (SERS) substrate materials with unique structures are considered as promising candidates for detection of dyes in the environment. In this work, a sea urchin-like K 2 Ti 8 O 17 (KTO) nanomaterial was prepared by a facile and efficient hydrothermal method . The enhancement factors of the sea urchin-like KTO for crystal violet and methylene blue are 3.8 × 10 5 and 2.45 × 10 5 respectively, and the minimum detection limits of both can reach 10 −8 M, which means the sea urchin-like KTO a promising non-metallic SERS substrate for detecting dyes in the environment. The excellent SERS performance of the sea urchin KTO was attributed to the excellent charge transfer and probe adsorption capability of KTO by energy band and zeta potential analysis. Finally, the excellent application potential of the sea urchin KTO was verified by simulating a practical use scenario.
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高影响因子
ACS Sustainable Chemistry & Engineering
·
2022
·
IF 9.224
Jiahuang Jian,Hongjun Kang,Xianshu Qiao,Kai Cui,Yang Liu,Yang Li,Wei Qin,Xiaohong Wu
Water electrolysis is an effective method of obtaining hydrogen energy, which is the key to achieve the global “carbon neutrality” goal. Molybdenum disulfide (MoS2) with a layered structure is considered to be a competitive hydrogen evolution reaction (HER) catalyst. However, until now, metal-atom-modified 1T-phase MoS2 with rich edge active sites has rarely been reported. Herein, we first report Co and Al co-optimized 1T-phase MoS2 (CA-1T-MoS2) with rich edge active sites using a simple one-step ball-milling method. The CA-1T-MoS2 exhibits an outstanding HER performance with an overpotential value of 102 mV at 10 mA cm–2 in 1.0 M KOH. The density functional theory (DFT) results prove that the introduction of Co and Al atoms on the rich edges of 1T-MoS2 provides rich active sites, improves the electrical conductivity, accelerates the distortion of H2O to generate H* and reduces the adsorption energy of hydrogen. Thus, CA-1T-MoS2 exhibits a prominent HER performance. This work provides a novel strategy for the simple preparation of metal-atom-modified 2D transition-metal sulfide HER catalysts with rich edge active sites.
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高影响因子
Small
·
2022
·Vol. 18
·期 32
·2203471
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IF 15.153
Minhao Sheng,Xiaoqing Bin,Yawei Yang,Yi Tang,Wenxiu Que
MAX phases are frequently dominated as precursors for the preparation of the star material MXene, but less eye-dazzling by their own potential applications. In this work, the electrocatalytic hydrogen evolution reaction (HER) activity of MAX phase is investigated. The MAX-derived electrocatalysts are prepared by a two-step in situ electrosynthesis process, an electrochemical etching step followed by an electrochemical deposition step. First, a Mo 2 TiAlC 2 MAX phase is electrochemically etched in 0.5 m H 2 SO 4 electrolyte. Just several hours, electrochemical dealloy etching of Mo 2 TiAlC 2 MAX powders by applying anode current can acquire a moderated HER performance, outperforming most of reported pure MXene. It is speculated that in situ superficially architecting endogenous MAX/amorphous carbide (MAC) improves its intrinsic catalytic activity. Subsequently, highly active metallic Pt nanoparticles immobilized on MAC (MAC@Pt) shows a transcendental overpotential of 40 mV versus RHE in 0.5 m H 2 SO 4 and 79 mV in 1.0 m KOH at the current density of 10 mA cm −2 without iR correction. Ultrahigh mass activity of MAC@Pt (1.5 A mg pt −1 ) at 100 mV overpotential is also achieved, 29-folds than those of commercial PtC catalysts.
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PubMed
高影响因子
Journal of Energy Chemistry
·
2022
·
IF 13.599
Fang Tang,Rongqing Xia,Dong Chen,Yu Yao,Lin Liu,Yuezhan Feng,Xianhong Rui,Yan Yu
Sodium metal battery (SMB) is regarded as a promising candidate for next-generation high-energy battery due to high theoretical capacity and abundant natural resources. However, the growth of sodium dendrites and large volume expansion during the processes of sodium plating and stripping seriously restrict the practical application of SMBs. Here, a three-dimensional skeleton of aluminum nanosheet arrays (Al NSARs) is constructed by a facile etching approach to achieve rapid and reversible Na plating/stripping. The Al NSARs with large geometric specific surface and plentiful cavities can provide rich active nucleation sites, reduce local current density and accommodate Na volume change, which lead to uniform deposition of sodium with dendrite-free morphology. As a result, Na plating/stripping on Al NSARs can stably operate over 650 cycles at 2 mA cm −2 /2 mAh cm −2 with average Coulombic efficiency (CE) of 100.0% and low potential polarization of 27 mV. Moreover, the full cell of Na 3 V 2 (PO 4 ) 3 ‖Al NSARs@Na can run for over 1800 cycles at a high rate of 20C. These superior properties, combined with relatively low cost and weight of Al, enable our Al NSARs to be great prospect for practical applications.
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高影响因子
MATERIALS CHARACTERIZATION
·
2022
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IF 4.537
Yang Yu,Xiaoping Cai,Zhejian Cao,Xinyang Jiao,Weining Xie,Yong Yu,Peizhong Feng
Porous NiAl intermetallic compounds demonstrate great potential in various applications by their high porosity and excellent oxidation resistance . However, to obtain a controllable NiAl intermetallic structure by tuning different process parameters remains unclear. In this work, porous NiAl intermetallic compounds were fabricated by economic and energy-saving thermal explosion (TE) reaction. The relationship between microstructure and process parameters was revealed using three-dimensional X-ray microscopy (3D-XRM) with high resolution and non-destructive characteristics. The geometrical features and quantitative statistics of the porous NiAl obtained at different heating rates (2, 10, 20 °C min −1 ) were compared. The result of the closed porosity calculation showed that a lower heating rate (2 °C min −1 ) promoted the Kirkendall reaction between Ni and Al, resulting in a high closed porosity (5.25%). However, at a higher heating rate (20 °C min −1 ), a homogeneous NiAl phase was observed using the threshold segmentation method, indicating uniform and complete TE reaction can be achieved at a high heating rate. The result of the 3D fluid simulation showed that the sample heated at 10 °C min −1 had the highest permeability (2434.6 md). In this study, we systematically investigated the relationship between the heating rates and properties of the porous NiAl intermetallic, including the phase composition, porosity, exothermic mechanism, oxidation resistance, and compression resistance. Our work provides constructive directions for designing and tailoring the performance of porous NiAl intermetallic compounds.
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高影响因子
Journal of Advanced Ceramics
·
2022
·Vol. 11
·期 7
·1117-1130
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IF 11.534
Tao Junnan,Wang Mingyuan,Liu Guiwu,Liu Qinqin,Lu Lei,Wan Neng,Tang Hua,Qiao Guanjun
Converting water into hydrogen fuel and oxidizing benzyl alcohol to benzaldehyde simultaneously under visible light illumination is of great significance, but the fast recombination of photogenerated carriers in photocatalysts seriously decreases the conversion efficiency. Herein, a novel dual-functional 0D Cd 0.5 Zn 0.5 S/2D Ti 3 C 2 hybrid was fabricated by a solvothermally in-situ generated assembling method. The Cd 0.5 Zn 0.5 S nano-spheres with a fluffy surface completely and uniformly covered the ultrathin Ti 3 C 2 nanosheets, leading to the increased Schottky barrier (SB) sites due to a large contact area, which could accelerate the electron-hole separation and improve the light utilization. The optimized Cd 0.5 Zn 0.5 S/Ti 3 C 2 hybrid simultaneously presents a hydrogen evolution rate of 5.3 mmol/(g·h) and a benzaldehyde production rate of 29.3 mmol/(g·h), which are ∼3.2 and 2 times higher than those of pristine Cd 0.5 Zn 0.5 S, respectively. Both the multiple experimental measurements and the density functional theory (DFT) calculations further demonstrate the tight connection between Cd 0.5 Zn 0.5 S and Ti 3 C 2 , formation of Schottky junction, and efficient photogenerated electron—hole separation. This paper suggests a dual-functional composite catalyst for photocatalytic hydrogen evolution and benzaldehyde production, and provides a new strategy for preventing the photogenerated electrons and holes from recombining by constructing a 0D/2D heterojunction with increased SB sites.
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高影响因子
Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 38
·14141-14150
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IF 8.067
Wei Song,Shuang Hu,Jiaxiang Lu,Liang Su,Zhemin Li,Junchen Liu,Yufeng Wu,Jianan Song,Zhenglian Liu,Shuaikai Xu,Sen Lin
A new kind of pollution known as electromagnetic interference (EMI) caused by the ubiquitous usage of integrated electronic devices and communication systems is attracting increasing attention. The design and mass-production of functional materials for large-scale, flexible, and curved surface EMI shielding remains a challenge. In this study, we have developed a time-difference blow-spinning technology to continuously fabricate multilayer polyacrylonitrile (MLPAN) nanofibers; on combining with roll-to-roll dip-coating post-processing, a flexible Ti3C2Tx/MLPAN hybrid fabric was obtained. It shows a special dual-scale multilayer structure, including a primary multilayer structure from MLPAN, and a secondary nanoscale multilayer structure from Ti3C2Tx. The hybrid fabric is lightweight (639.0 mg cm−3), with high conductivity (23327.40 S m−1) and good mechanical stability. Moreover, this hybrid fabric exhibits a remarkable EMI shielding property with a shielding efficiency of 61.8 dB, which is attributed to the synergistic effect of surface reflection, internal multiple scattering and multiple reflections.
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高影响因子
Particuology
·
2022
·
IF 3.251
Lichen Zhang,Shuo Wang,Xing Su,Xiaodong Li,Meishuai Zou
The dense alumina shell on the surface of aluminum powder will hinder the combustion of aluminum powder and increase its ignition temperature. In this study, the aluminum oxide shell layer on the surface of aluminum powder was removed with hydrofluoric acid by one-pot method, and 3-Perfluorohexyl-1, 2-epoxypropane (PFHP) (F 3 C(CF 2 ) 5 CH 2 C 2 H 3 O) was coated to form a uniform and controllable core-shell Al@PFHP. The core-shell Al@PFHP showed better thermal reaction and ignition performance. The exothermic enthalpy of Al@0.15 PFHP was increased by about 1.9 times, with lower ignition temperature (reduced by about 140 °C) and longer burning duration (increased by about 1.5 times) after coating with PFHP, compared with raw aluminum powder. In addition, the formation of PFHP coating shell can effectively improve the hydrophobicity and corrosion resistance of aluminum powder.
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高影响因子
FUEL
·
2022
·
IF 8.035
Zhicong Qiu,Junjian Tian,Yu Liu,Hao sun,Zhanshi Ni,Qizhao Lin,Liqun He
As a high-energy metal fuel , aluminum powder particles (AP) have long been used as fuel propellants and combustion-supporting additives in explosives to meet the design requirements of a new generation of high-energy–density fuels. In this experiment, the micro-explosion and combustion characteristics of ethanol-biodiesel mixed droplets with different aluminum powder particle contents and particle sizes were studied under high temperature and pure oxygen environment. In order to better control the experimental variables, a more accurate single-droplet suspension method was adopted in this experiment. The entire evaporation and combustion process of the mixed fuel was completely recorded and analyzed by using high-speed photography technology , binarization imaging technology and droplet optimization algorithms. The experimental results show that when the content of aluminum powder particles remains unchanged, increasing the particle size of aluminum powder in the mixed droplets will promote the micro-explosion phenomenon. When the particle size of the aluminum powder contained in the mixed fuel is different, the increase of the particle content will have a completely different effect on the heating time of the droplet. When the particle size of aluminum powder particles is small, the combustion duration of the mixed droplets increases with the increase of aluminum powder content, while the opposite results are shown when the aluminum powder particles are larger. Increasing the amount of aluminum powder also extends the full life of the droplets. In addition, this study introduces the microburst intensity (MI), which provides a new idea and method for laterally comparing the microburst phenomena of fuel droplets with different initial diameters. For mixed fuel containing micron-sized aluminum particles, the particle content that produces the best micro-explosion intensity is about 20%.
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高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2022
·
IF 4.889
Yanmei Zhang,Qingsong Xing,Anfu Chen,Mingke Li,Guofeng Qin,Jingjing Zhang,Caihong Lei
The Cassie–Baxter equation is not always applied to all heterogeneous surfaces for explaining superhydrophobic phenomena. A two-step anodization method combining with a microstructure (MS) imprinting process is used to prepare anodized aluminum oxide (AAO) templates with mushroom-shaped nanostructure (NS) and micro-/nanostructure (MNS). Polypropylene surfaces with single-tier architecture (i.e., NS or MS) and hierarchical structure (i.e., MNS) are replicated using AAO templates by compression molding. The key to improving hydrophobicity of single-tier architecture is increasing contact line density ( ρ cl ). Data fitting shows that the relationship between ρ cl and contact angle (CA) is a sophisticatedly exponential curve. By tuning the diameter and array density of NS, the optimized NS replica achieves a CA of 163.7° and roll-off angle of 0.9°. Further, the optimized MNS replica possessing low CA hysteresis of 0.2° and surface adhesion force of 4 μN achieves a relative reduction of energy loss by 7% compared with NS replica.
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高影响因子
Energy Storage Materials
·
2022
·
IF 20.831
Shuanghui Han,Zhenbang Li,Yuji Zhang,Danni Lei,Chengxin Wang
The practical application of rechargeable lithium metal batteries is limited by inhomogeneous lithium deposition and infinite side reactions. In practical scenarios, the temperature of the battery increases, which may aggravate side reactions and decrease the battery efficiency significantly. Herein, we report a unique lithium thermal reduction method for producing lithium-rich alloys from metal ethoxides. The uniformly distributed nanoscale Li–Al alloy in Li metal anodes can induce the uniform deposition of lithium metal and effectively inhibit side reactions. Therefore, the lithium rich alloy anode presents extremely low overpotential (5 mV) and cycles for 1000 h with no short circuit at the range of 30–60 °C under 0.5 mA cm −2 and 1 mAh cm −2 . When the anode is coupled with a commercial high loading LiNi 0.6 Co 0.2 Mn 0.2 O 2 cathode (8.8 mg cm −2 ), a capacity retention of 72% is obtained after 490 cycles at 30 °C. Furthermore, the cell matched with a higher mass loading LiNi 0.6 Co 0.2 Mn 0.2 O 2 cathode (21.6 mg cm −2 ) maintained a high coulombic efficiency of 99.5% and a stable cycle for 300 h at 60 °C.
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高影响因子
危险品化学品经营许可证（带存储）