COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Zhongming Li,Qi Liu,Shan Tang,Dong Feng,Wenbo Zhao,Bin Li,Delong Xie,Yi Mei
It is significant to develop high-efficient fire retardants all the time. Ethylene vinyl acetate (EVA) features flammability and poor fire resistance ability, which severely hindered its extensive application with advanced requirements. Herein, a novel strategy was proposed to combining long chain phosphaphenanthrene grafted MXene (DPP-MXene, also donated as DM) and black phosphorene nanosheets (BP) with EVA to fabricate EVA/DMBP nanocomposites with high fire resistance. Thermogravimetric analysis (TGA) proved that DMBP synergistic system can significantly improve the thermal stability and char forming ability of EVA as proved by delayed thermal decomposition temperatures . The combustion test results suggested that the addition of 3 wt. % DMBP into EVA matrix can induce the EVA/DMBP-3 composites with favorable flame resistance property, the UL-94 V-0 rating and limiting oxygen index (LOI) value (26.7 %) was achieved for the EVA/DMBP-3 components, and significantly decrease in total heat release (THR) (21.5 %) and peak heat release rate (PHRR) (48.1 %) were achieved by addition of 3 wt. % DMBP into EVA elastomer , indicated its incombustible nature. Furthermore, it was found that the incorporation of DMBP synergistic system only yielded the EVA/DMBP-3 composites with slight reduction of the tensile strength and elongation at break as compared to neat EVA. The high efficiency of the prospect flame retardant provided a competitive candidate material for EVA towards wide applications.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Mengyuan Song,Changhao Tian,Xintong Xu,Tao Huang,Aishui Yu
For lithium-oxygen batteries (LOBs), the leakage and volatilization of a liquid electrolyte and its poor electrochemical performance are the main reasons for the slow industrial advancement. Searching for more stable electrolyte substrates and reducing the use of liquid solvents are crucial to the development of LOBs. In this work, a well-designed succinonitrile-based (SN) gel polymer electrolyte (GPE-SLFE) is prepared by in situ thermal cross-linking of an ethoxylate trimethylolpropane triacrylate (ETPTA) monomer. The continuous Li+ transfer channel, formed by the synergistic effect of an SN-based plastic crystal electrolyte and an ETPTA polymer network, endows the GPE-SLFE with a high room-temperature ionic conductivity (1.61 mS cm–1 at 25 °C), a high lithium-ion transference number (tLi+ = 0.489), and excellent long-term stability of the Li/GPE-SLFE/Li symmetric cell at a current density of 0.1 mA cm–2 for over 220 h. Furthermore, cells with the GPE-SLFE exhibit a high discharge specific capacity of 4629.7 mAh g–1 and achieve 40 cycles.
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CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Yaqiong Du,Fengling Wang,Meihua Hu,Qianku Hu,Aiguo Zhou
Mo 2 Ga 2 C is a novel member of MAX phases, which is a family of ternary carbide/nitride with layered structure. The stability and wettability of Mo 2 Ga 2 C in molten metals are crucial for the application of Mo 2 Ga 2 C in the field of composite materials. In this work, the stability and wettability of Mo 2 Ga 2 C in three molten metals (Pb, Sn and Zn) were investigated. Mo 2 Ga 2 C was mixed with metal powders and annealed at different temperatures under vacuum. At 700 °C, Mo 2 Ga 2 C was not stable in any of the three molten metals. The decomposition of Mo 2 Ga 2 C was affected by the type of metal matrix as well as the reaction temperature. Mo 2 Ga 2 C decomposed at 550 °C in Pb, at 450 °C in Sn, or at 650 °C–750 °C in Zn. To characterized the wettability of these metals with Mo 2 Ga 2 C, the contact angle of molten metals with Mo 2 Ga 2 C at 650 °C were measured, which are 103° for Pb, 126° for Sn and 0° for Zn, respectively. Mo 2 Ga 2 C has good wettability with Zn and is not wetted by Pb and Sn.
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Small
·
2023
·Vol. 19
·期 30
·2300378
·
IF 13.3
Qian Zhao,Xiulong Wu,Shenghu Li,Qiaotian Zheng,Shuai Jiang,Ye Xu,Bin He,Ling Ma,Yangtong Luo,Yujue Wang,Wanglai Cen,Yan Meng,Dan Xiao
Currently, the commercial separator (Celgard2500) of lithium-ion batteries (LIBs) suffers from poor electrolyte affinity, mechanical property and thermal stability, which seriously affect the electrochemical performances and safety of LIBs. Here, the composite separators named PVDF-HFP/TiN for high-safety LIBs are synthesized. The integration of PVDF-HFP and TiN forms porous structure with a uniform and rich organic framework. TiN significantly improves the adsorption between PVDF-HFP and electrolyte, causing a higher electrolyte absorption rate (192%). Meanwhile, XPS results further demonstrate the tight link between PVDF-HFP and TiN due to the existence of Ti F bond in PVDF-HFP/TiN, resulting in a strong impediment for the puncture of lithium dendrites as a result of the improved mechanical strengths. And PVDF-HFP/TiN can effectively suppress the growth of lithium dendrites by means of uniform lithium flux. In addition, the excellent heat resistance of TiN improves the thermal stability of PVDF-HFP/TiN. As a result, the LiFePO 4 ||Li cells assembled PVDF-HFP/TiN-12 exhibit excellent specific capacity, rate performance, and capacity retention rate. Even the high specific capacity of 153 mAh g −1 can be obtained at the high temperature of 80 °C. Meaningfully, a reliable modification strategy for the preparation of separators with high safety and electrochemical performance in LIBs is provided.
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OPTICAL MATERIALS
·
2023
·
IF 3.9
Xupeng Zhu,Jun Zhang,Jun Liao,Qiang Ru,Wenfeng Fu,Zhiguo Wang,Shuwen Xue
Return to the physics origin of Cu 2 ZnSnS 4 type (CZTS-type, include CZGS, CZGTS, CZTSSe, etc.) material system, studying the influence of replacement elements on the optoelectronic properties by preparing high-quality single crystal materials to clarify the relationship between the key defect states of materials and carrier dynamics is the only way which must be passed to find efficient paths to improve the existing performance of CZTS-type optoelectronic devices. Herein, the optical behavior of high-quality Cu 2 ZnGe x Sn 1-x S 4 (CZGTS) single crystal prepared by the molten salt method and its relationship with Ge content were systematically studied using a photoluminescence (PL) and absorption tests at room temperature. Combined with the simple electrical tests, the transformation of carrier recombination mechanism as increasing the Germanium content in CZGTS single crystal before and after phase transition were reported for the first time. The transmission electron microscopy images, X-ray diffraction spectra and Raman scattering spectra of CZGTS were adopted to reveal the evolution mechanism of single crystal growth and phase transition caused by the change of Ge composition. The results show that the tunable blue-shift of PL peak emerges with the increase of Ge content and the excitation power dependence has a saturation phenomenon in the CZGTS single crystal particles. In consideration of the optical bandgap, PL peak position, PL intensity, carrier lifetime and the macroscopic resistivity, it is confirmed that the intrinsic PL behavior could be effectively tailored by different Ge amounts. Compared with the recombination PL of interband carrier (E p > E g ) in Cu 2 ZnSnS 4 , the band tailed carriers (E p < E g ) dominated by defect states would play a powerful role in CZGTS single crystal. Our work provides a strategy for tailoring the bandgap of CZGTS materials and a new perspective for understanding the influence of defect states on carrier dynamics.
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ADVANCED MATERIALS
·
2023
·Vol. 35
·期 25
·2302007
·
IF 29.4
Zongpeng Wang,Zhiping Lin,Yinglan Wang,Shijie Shen,Qinghua Zhang,Jiacheng Wang,Wenwu Zhong
Nontrivial topological surface states (TSSs), which possess extraordinary carrier mobility and are protected by the bulk symmetry, have emerged as an innovative platform to search for efficient electrocatalysts toward hydrogen evolution reaction (HER). Here, a Sn-based nontrivial metal Ru 3 Sn 7 is prepared using electrical arc melting method. The results indicate that the (001) crystal family of Ru 3 Sn 7 possesses nontrivial TSSs with linear dispersion relation and large nontrivial energy window. Experimental and theoretical results demonstrate that nontrivial TSSs of Ru 3 Sn 7 can significantly boost charge transfer kinetics and optimize adsorption of hydrogen intermediates due to bulk symmetry-protected band structures. As expected, nontrivial Ru 3 Sn 7 exhibits superior HER activity to Ru, Pt/C, and trivial counterparts (e.g., Ru 2 Sn 3 , IrSn 2 , and Rh 3 Sn 2 ) with higher ratios of noble metals. Furthermore, the wide pH-range activity of topologically nontrivial Ru 3 Sn 7 implies the robustness of its TSSs against pH variation during the HER. These findings provide a promising approach to the rational design of topologically nontrivial metals as highly efficient electrocatalysts.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Na Zhao,Yuhao Zou,Xinzhi Chen,Hairui Weng,Chenyao Wang,Yuanzhi Zhu,Yi Mei
Solid polymer electrolytes attract much attention due to their good flexibility and good interfacial contact property. However, the inherent thermal instability of polymers inhibits the practical application of solid polymer electrolytes . In this work, the black phosphorene nanosheet , a fire-retardant additive, was introduced and incorporated into poly (ethylene oxide) (PEO)-based solid polymer electrolyte to improve the thermal property . The BP/PEO based solid polymer electrolyte membrane is thermally stable, nonflammable, and mechanically strong, more than 400 h of cycling with low polarization based on a Li-Li symmetric cell was achieved. LiFePO 4 //Li solid state battery with the BP/PEO based solid polymer electrolyte shows a high-capacity performance (153 mAh g −1 at 0.1 C) as well as cycling performance (100 cycles at 0.2 C rate) at 60 °C. The flammability tests indicated that a small amount of black phosphorene can make the electrolyte display good non-flammability. In the micro-scale combustion calorimetry test, the peak heat release rate of BP/PEO based solid polymer electrolyte reduced by 62.5% and flame ignition time is slower compared with the PEO based solid polymer electrolyte without incorporating black phosphorene. The present work demonstrated that the black phosphorene nanosheets do not weaken the electrochemical properties of solid polymer electrolytes, but also enhance their thermal properties.
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Advanced Optical Materials
·
2022
·Vol. 11
·期 3
·2202087
·
IF 10.05
Zhe Liu,Xiyu Jia,Weishuai Duan,Xinfa Zhu,Biao He,Chun Sun,Mengjun Wang,Erping Li,Chao Fan
Tin disulfide (SnS 2 ) is an emerging 2D-layered metal dichalcogenide with promising application potential for highly sensitive and fast-response-speed photodetectors. However, SnS 2 -based photodetectors still have drawbacks that limit their practical and commercial applications. Herein, an effective route is proposed for constructing SnS 2 /indium-doped SnS 2 homostructures to improve photodetector performance. Vertical SnS 2 /Sn 0.991 In 0.009 S 2 homostructures and photodetectors based on these homostructures were fabricated via a polydimethylsiloxane-assisted dry-transfer method. The photodetectors exhibit excellent performance, including a high photoresponsivity of up to 271.7 A W −1 , high normalized detectivity of up to 2.13 × 10 12 cm Hz 1/2 W −1 , and fast response time of ≈10 ms. The pseudo-built-in electrical field of the SnS 2 /Sn 0.991 In 0.009 S 2 homostructure results in the superior performance of the photodetectors based on this material compared to that based on individual SnS 2 and Sn 0.991 In 0.009 S 2 thin layers, most 2D materials, and commercial photodetectors (e.g., THORLABS FD11A Si, and FGA01 InGaAs). This study provides a facile and effective approach to enhance the performance of SnS 2 -based photodetectors and paves the way for future applications of photodetectors based on SnS 2 and other 2D materials.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Wensheng Li,Zhenting Yin,Liangyuan Qi,Bin Yu,Weiyi Xing
Multifunctional fire-safe textiles are urgently needed to meet the application requirements under harsh environments, e.g. , high-frequency environments. However, it is rather tough to realize scalable production of multifunctional fire-safe textiles by constructing coatings. To tackle the hurdles above, multifunctional fire-safe cotton fabric was prepared though a blade-coating strategy (using black phosphorus and Ti 3 C 2 T x nano-dispersion ink), followed by hydrophobic treatment with poly (dimethylsiloxane) coating. The resultant textiles with the coating of micra-like structure exhibit excellent water resistance with a water contact angle of up to 93° and excellent heat response within 10 s to the original temperature. Furthermore, the as-designed textiles demonstrate high flame retardancy and superior shielding effectiveness (SE) of 58 dB, which is much better than the reported treated fabric. The final treated fabric with high electromagnetic interference shielding effectiveness is suitable for most commercial applications. This work provides a promising strategy to produce functional textiles with superior electromagnetic interference and exceeding thermal management at a large scale, showing potential applications in electronic, electrical, and military fields.
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Advanced Energy Materials
·
2023
·Vol. 13
·期 12
·2203168
·
IF 27.8
Yifan Yu,Meng Lei,Decheng Li,Chilin Li
Solid-state fluoride ion batteries (SSFIBs) are anion-shuttle-driven and alkali-metal-free emerging energy storage systems, and have the advantages of low cost, high safety, and energy density. However, the current major challenges of SSFIBs or quasi-SSFIBs are the lack of high-conductivity fluoride electrolytes and the difficulty of mild-temperature operation of full cells. Here, a 2D fluoride conductor (KSn 2 F 5 ) synthesized by mechanochemical method is employed as the compatible solid electrolyte with a high F-ion conductivity of 10 −4 S cm −1 at 60 °C. The high concentration and frequent hopping of charge carriers in F-vacancy-rich KSn 2 F 5 contribute to the higher ionic conductivity compared to most reported fluoride structures. Integrating this layered electrolyte with high-voltage CuF 2 cathode and Sn/SnF 2 anode, a highly reversible cycling of conversion-type quasi-SSFIBs with a discharge capacity of 150 mAh g −1 for at least 70 cycles at 60 °C is achieved. The interface engineering aided by tetra- n -butylammonium fluoride salt facilitates the F-ion transfer between cathode and electrolyte and fluorination/defluorination conversion mechanism of CuF 2 cathode with optimized multiphase and nanodomain distributions.
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CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Ming Yan,Jiangtao Huang,Mengliu Yang,Hao Zhang,Yu Zhu,Nengyu Zhou,Juan Wang
MAX phases are layered ternary carbides and nitrides with unique properties, doping transition metals in it is attracting significant attentions for the processing of this relatively new class of materials. In this paper, a magnetic solid solution MAX phase V 2 (Sn 1− x A x )C ( A = Mn, Fe, Co) was synthesized by doping Mn/Fe/Co atoms into V 2 SnC by pressure-less sintering. The XRD results show that when x = 0.4, the characteristic peak shifts to the right, and the substitution reaches saturation. SEM and TEM show that doping does not change the original layered morphology and hexagonal crystal form, but only the lattice constants decrease slightly. Magnetic test results indicate that V 2 (Sn 1− x A x )C is a typical low-temperature magnetic material with a Curie temperature around 60 K, and the magnetization increases with the increase of doping amount. Moreover, we explained the reasons of V 2 SnC doping A-site instead of M-site and the changing trend of the magnetic moments by first-principles calculations, which are consistent with the experimental results.
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ChemSusChem
·
2023
·Vol. 16
·期 7
·e202202092
·
IF 8.4
Xiangxin Meng,Bo Shen,Qing Sun,Jianguo Deng,Die Hu,Bonan Kang,S. Ravi P. Silva,Xu Wang,Lijun Wang
Graphical Less defects, higher efficiency : Small organic molecule 2-chlorothiazole-4-carboxylate (SN) acts as interface regulator to modify the perovskite film, improve the quality of perovskite crystals, reduce non-radiative recombination and surface defects and adjust the energy level between perovskite layer and hole transport layer, ultimately improving the performances of perovskite solar cells (PSCs). The power conversion efficiency (PCE) of perovskite solar cells (PSCs) has been greatly improved recently. However, in organic–inorganic polycrystalline perovskite films many defects inevitably exist, which limits the PCE and stability of PSCs. Herein, a small organic molecule 2-chlorothiazole-4-carboxylic acid (SN) is spin coated on a perovskite film to enhance the performance of PSCs. We find that the multifunctional molecule SN reacts with under-coordinated Pb 2+ ions and I − vacancies because of the presence of the sulfur and nitrogen donor atoms, and the −COOH groups, which are conducive to suppressing charge recombination and passivating defects. Even more, the introduction of the SN layer can effectively adjust the energy level alignment, which is conducive to the separation and extraction of charge carriers in PSCs. Therefore, devices with SN modification show a champion PCE of 22.55 %. Besides, PSCs with SN show impressive stability, retaining 96 % of its initial PCE after storage in ambient air for 500 h.
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