CHEMICAL ENGINEERING JOURNAL
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2018
·
IF 6.735
Xiao-Fei Wang,Gui-Gen Wang,Jia-Bing Li,Zheng Liu,You-Xiao Chen,Long-Fei Liu,Jie-Cai Han
Herein we first report new chlorine-doped graphene quantum dots (Cl-GQDs) that can be used in solid-state white-light-emitting diodes (WLEDs). The Cl-GQDs with a mean size of 1.53 nm are obtained by one-step hydrothermal method using β-cyclodextrin and hydrochloric acid as the source materials. The PL emission spectra of the Cl-GQDs show an excitation-wavelength-dependent behavior in the range from 300 to 380 nm excitation. Under UV irradiation, the Cl-GQDs can direct emit white light. Given that they are worth using in light-conversion, Cl-GQDs embedded solid composite film (Cl-ESCF), based on silicon resin as host material, is successfully fabricated by solution-processing approach. The freestanding Cl-ESCF has high transparency and flexibility, excellent photostability and temperature resistance, and retains its optical properties in the solid state. In order to realize its potential, the Cl-ESCF converted remote UV-pumped WLED is demonstrated. The results verify that the Cl-GQDs can be homogeneously dispersed within solid matrix without obvious aggregation so that a uniform and defect-free natural white light can be obtained. In addition, our WLED possesses favorable white-light characters with the CIE of (0.33, 0.34), moderate CCT of 5653 K, and high CRI of 87.6, as well as good color and LED stability. This single-phase rare-earth-free white-luminescent Cl-GQDs may be not only expected to prevent the drawbacks of multicolor phosphors, thereby generating high-quality white emission, but also identified to be a green alternative for conventional emitters.
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高影响因子
CHEMISTRY OF MATERIALS
·
2018
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IF 9.89
Ying Liu,Fei Li,Quanlin Liu,Zhiguo Xia
All inorganic cesium lead halide CsPbX3 (X = Cl, Br, I) perovskite nanocrystals (NCs) are generally considered to be sensitive and even decompose when exposed to ambient humidity. Herein, we perform a well-controlled investigation of the effect of postsynthetic water treatment of the as-prepared CsPbX3 NCs on the photoluminescence quantum yields (PLQYs) and stability, and one can find that the surface defective layer of CsPbX3 NCs can be dissolved into water and we can further separate the supernatant CsPbX3 NCs hexane solution from the water, which improves the PLQYs of CsPbCl3, CsPbBr3, CsPbI3 from 5%, 69.3%, 68.1% to 78.5%, 95.5%, 91%, respectively. As a synergetic effect, a trace amount of residual water facilitated the hydrolysis of tetramethyl orthosilicate, leading to the formation of SiO2-coated CsPbX3 NCs with high stability. The stable green-emitting CsPbBr3/SiO2 composite is used as an example to combine with red K2SiF6:Mn4+ to fabricate the light-emitting diodes device on the blue InGaN chip, which displays wide color gamut (128% of National Television Standard Committee standard), providing the possibility for liquid-crystal display backlight utilization.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 6
·1-10
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IF 2.8
Zhou Jintao,Zang Yue,Wang Yu,Chu Liang,Li Guodong,Xu Rui,Yan Wensheng
Silver nanowires have great development potential in the field of transparent electrodes, and their optoelectronic properties are closely related to the morphology and composition. During the synthesis of polyol method, the aspect ratio of AgNWs can be tailored using PVP with different molecular weights, and the diameter of AgNWs can be tuned by incorporating halides. Here, the synergistic effect of Cl − and Br − in the mixed PVP system were deeply investigated by adjusting the concentration ratio of Cl − and Br − . The growth mechanism of silver nanowires was studied by monitoring the acidity of the reaction process. It was found that under the assistance of PVP with different molecular weights, the coordination of Cl − and Br − greatly increased the activation energy of the reaction, which played a key role in the nucleation and growth of AgNWs. As a result, high-quality AgNWs with an average length of 35.7 μm and an average diameter of 67 nm were synthesized at the optimized concentration ratio of Cl − and Br − . Finally, the synthesized silver nanowires were deposited as conductive films on glass to obtain high-performance transparent electrode with a sheet resistance of 22.38 Ω/sq and transmittance of 83.95%.
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CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Fanyong Yan,Yao Wang,Chunhui Yi,Jinxia Xu,Bowei Wang,Ran Ma,Ming Xu
The composition of composite photocatalysts with both broad spectral response and efficacious separation of photoinduced carriers were essential. The CDs were installed on the surface of the three-dimensional hollow microsphere nanophotocatalyst Bi 2 WO 6 by the hydrothermal approach. Crystal structure, morphology and composition revealed the synthesis of the composite catalyst. The higher photocatalytic capability of 0.5% CDs/Cl–Bi 2 WO 6 (0.0317 min −1 ) was observed in the degradation procedure, explained that the doping of Cl and the presence of CDs remarkably strengthened the visible light capture and depressed the rate of electron-hole pair complexation. Notably, scavenger-quenching assays results verified that activities of h + , •OH and •O 2 ‾ were the primary actors in the degradation procedure. Ultimately, the degradation mechanism of a feasible TCH was submitted. This study presented a novel concept for the exploitation of composite nanophotocatalysts for the effective degradation of organic pollutants.
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CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Zhangwen Long,Shuai Yang,Jiacheng Pi,Dacheng Zhou,Qi Wang,Yong Yang,Hao Wu,Jianbei Qiu
All-inorganic metal halides perovskites , such as CsPbX 3 quantum dots (QDs), are high-performance photoelectric materials ; they have attracted considerable attention for applications such as LEDs and laser and solar cells. Herein, we report an anion hot injection (HI) method to prepare CsPbX 3 (X = Cl, Br, I, Cl/Br, and Br/I) QDs using trimethylhalosilane (TMXS) as a halogen ion donor. By adjusting the ratio of different TMXSs (trimethylchlorosilane, trimethylbromosilane, and trimethyliodosilane), the synthesized samples can achieve tunable emission in the range of 416–710 nm, narrow emission line widths of 13–33 nm, and luminescence lifetimes of 32–223 ns. These QDs also have better stability in external environment compared with those obtained using traditional HI method.
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WATER RESEARCH
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2022
·
IF 13.4
Wenxiao Zheng,Yingkai Chen,Hengyi Fu,Zhang Yan,Zhenchao Lei,Weijian Duan,Chunhua Feng
The generation of chlorinated byproducts during the electrochemical oxidation (EO) of Cl − -laden wastewater is a significant concern. We aim to propose a concept of converting reactive species (e.g., reactive chlorines and HO • resulting from electrolysis) into 1 O 2 via the addition of H 2 O 2 , which substantially alleviates chlorinated organic formation. When phenol was used as a model organic compound, the results showed that the H 2 O 2 -involving EO system outperformed the H 2 O 2 -absent system in terms of higher rate constants (5.95 × 10 −2 min −1 vs. 2.97 × 10 −2 min −1 ) and a much lower accumulation of total organic chlorinated products (1.42 mg L −1 vs. 8.18 mg L −1 ) during a 60 min operation. The rate constants of disappearance of a variety of phenolic compounds were positively correlated with the Hammett constants ( σ ), suggesting that the reactive species preferred oxidizing phenols with electron-rich groups. After the identification of 1 O 2 that was abundant in the bulk solution with the use of electron paramagnetic resonance and computational kinetic simulation, the routes of 1 O 2 generation were revealed. Despite the consensus as to the contribution of reaction between H 2 O 2 and ClO − to 1 O 2 formation, we conclude that the predominant pathway is through H 2 O 2 reaction with electrogenerated HO • or chlorine radicals (Cl • and Cl 2 • − ) to produce O 2 • − , followed by self-combination. Density functional theory calculations theoretically showed the difficulty in forming chlorinated byproducts for the 1 O 2 -initiated phenol oxidation in the presence of Cl − , which, by contrast, easily occurred for the Cl • -or HO • -initiated phenol reaction. The experiments run with real coking wastewater containing high-concentration phenols further demonstrated the superiority of the H 2 O 2 -involving EO system. The findings imply that this unique method for treating Cl − -laden organic wastewater is expected to be widely adopted for generalizing EO technology for environmental applications.
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PubMed
高影响因子
JOURNAL OF POWER SOURCES
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2022
·
IF 9.794
Dekun Shi,Zhaojun Shi,Lixin Zhang,Yaan Cao
A series of halogen ions (Cl − , Br − , or I − ) modified Bi 2 MoO 6 (Bi 2 MoO 6 –Cl, Bi 2 MoO 6 –Br, or Bi 2 MoO 6 –I) are synthesized via a one-step solvothermal method . It is determined that the halogen ions (Cl − , Br − , or I − ) are modified on the surface of Bi 2 MoO 6 as the -Bi-Cl, -Bi-Br, or -Bi-I species (the connected Bi 3+ is coordinated with three lattice O2- ions in Bi 2 MoO 6 ). The -Bi-Cl, -Bi-Br, or -Bi-I species on the Bi 2 MoO 6 surface can act as highly active sites to polarize and activate the N 2 and H 2 O molecules adsorbed on the surface of catalysts. Moreover, due to the surface-modified -Bi-Cl, -Bi-Br, or -Bi-I species, the visible light absorption is improved, the separation of photogenerated charge carriers is promoted, as well the band structure is better matched with the redox potential of photoreduction of N 2 . As a result, the photocatalytic activity of Bi 2 MoO 6 –Cl, Bi 2 MoO 6 –Br, or Bi 2 MoO 6 –I is improved for photoreduction of N 2 into NH 3 compared with Bi 2 MoO 6 . Overall, this work provides new insights into the doping states of halogen ions, the surface-active sites, the band structure, the photocatalytic activity, and the mechanism for photoreduction of N 2 into NH 3 for Bi 2 MoO 6 with modification of halogen ions (Cl − , Br − , or I − ).
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PROPELLANTS EXPLOSIVES PYROTECHNICS
·
2021
·Vol. 46
·期 12
·1837-1843
·
IF 1.887
Shuyi Duan,Feng Ding,Haitao Sun,Chun Xiao,Shangbin Li,Qing Zhu
To have a deep understanding of the effects of surface wettability on the mechanical sensitivity and rheological characteristics of PBX slurry, CL-20 particles with hydrophilic property was prepared through a polymerization process of dopamine, and CL-20 particles with hydrophobic property were prepared through a condensation polymerization process of hexadecyltrimethoxylsilane. The morphology, surface element content and surface wettability of CL-20 crystals before and after modification were characterized by scanning electronic microscope (SEM), X-ray photoelectron spectroscopy (XPS), and contact angle test. The rheological characteristics of CL-20 based PBX slurry showed that the interaction between explosive particles and binder was changed with different surface wettability of CL-20. The weaker interaction between CL-20@hydrophobic and binder lead to weaker solid-liquid friction, resulted in lower apparent viscosities of CL-20@hydrophobic based PBX slurry at high shear rate. The mechanical sensitivity of wax coated CL-20 with different surface wettability was tested. CL-20@hydrophobic-wax exhibited better mechanical stability compared to CL-20-wax and CL-20@hydrophilic-wax, probably owning to the weaker interaction between CL-20@hydrophobic surface and wax.
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
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2021
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IF 8.067
Jun Guo,Yu-Ke Zhu,Lin Chen,Zi-Yuan Wang,Zhen-Hua Ge,Jing Feng
Bi 2 S 3 -based alloys are considered promising thermoelectric materials due to their large Seebeck coefficient and low lattice thermal conductivity . However, low electrical conductivity usually leads to poor electrical transport properties, which seriously restricts their further application in thermoelectric refrigeration and/or power generation. In this work, Bi 2 S 3 with high electrical transport properties is synthesized hydrothermally via Se and Cl co-doping. The maximum electrical conductivity value of 483 S cm −1 was obtained for the Bi 2 S 2.4 Se 0.4 Cl 0.20 sample at room temperature. The significant improvement of electrical conductivity gives rise to a high average power factor of 411 μW m −1 K −2 during the measuring temperature range and a peak value of 456 μW m −1 K −2 at 673 K. Benefiting from the largely improved electrical transport properties, a superior ZT value of approximately 0.66 and ZT ave . of 0.36 were obtained for Bi 2 S 2.4 Se 0.4 Cl 0.20 , and the theoretically calculated conversion efficiency reached 5.7%. The results indicate that Bi 2 S 3 is a promising candidate for thermoelectric applications at medium temperatures.
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2020
·
IF 4.495
Mengfeifei Jin,Xiaojuan Liang,Huiling Zhang,Jianming Liu,Guangzhan Shao,Weidong Xiang,Yinglin Song
As laser technology advances, the importance of laser protection puts an urgent demand for robust and high-efficient optical limiting materials. In this work, CsPbX 3 (X = Cl/Br, Br) NCs were synthesized by precisely controlling the ratio of Cl − to Br − and the heat treatment temperature, and the third-order nonlinear (TONL) optical properties of them were investigated systematically and deeply based on a nonlinear optical imaging technique with the phase-object (NIT-PO) at 532 nm for the first time. All of them demonstrate strong reverse saturation absorption (∼10 -12 –10 -11 m/W), and the sign of TONL refraction index (γ) relates to the component (CsPb(Cl/Br) 3 NCs glasses: ∼10 -20 m 2 /W, CsPbBr 3 NCs glasses: ∼−10 -20 to 10 -19 m 2 /W). In addition, they have excellent characteristics of thermal stability and water stability, as well as photostability under 455 nm laser irradiation, indicating that it is a promising optical limiting material.
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ACS Applied Nano Materials
·
2024
·
IF 5.3
Yu Yao,Qianhong Shen,Qifeng Chen,Yanyan He,Libei Jiang,Jie Liu,Yue Li,Xudan Cao,Hui Yang
A silver phosphate (Ag3PO4)/silver (Ag)/silver halide (AgX, X = Cl, Br, or I) ternary composite photocatalysts were prepared by loading Ag nanoparticles on Ag3PO4 tetrapods followed with in situ halogenation. The interface charge transfer behavior in the Ag3PO4/Ag/AgX nanocomposite was studied, and the photocatalytic performance was also evaluated. The results show that the Ag3PO4/Ag/AgI photocatalyst exhibits higher photocatalytic activity than the other two photocatalysts due to the more matched band structure between AgI and Ag3PO4. An internal electric field (IEF) from Ag3PO4 to AgI is formed at the heterogeneous interface, so the photogenerated electrons at the conduction band of AgI can rapidly transfer to the valence band of Ag3PO4 and recombine with photogenerated holes, which is consistent with the S-scheme charge transfer mechanism. Meanwhile, the photogenerated electrons left at the conduction band of Ag3PO4 can transfer to Ag nanoparticles due to the Schottky junction and react with oxygen to produce •O2–, which is proved to be the main active species in the photocatalytic procedure. This tandem junction modulated between the S-scheme heterojunction and Schottky junction promotes the efficient separation of photogenerated carriers, thus significantly increasing the average PL lifetime of electrons by 2.95 times. Therefore, the Ag3PO4/Ag/AgI photocatalyst exhibits excellent photocatalytic activity for the degradation of methylene blue and norfloxacin. The seven consecutive cyclic tests prove the good stability of the photocatalyst, thus showing the application potential in the field of sewage treatment.
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CHINESE JOURNAL OF CATALYSIS
·
2016
·
IF 2.628
Xinping Duan,Yan Yin,Xuelin Tian,Jinhuo Ke,Zhaojun Wen,Jianwei Zheng,Menglin Hu,Linmin Ye,Youzhu Yuan
Disintegration or redispersion of supported sintered gold nanoparticles (Au NPs) in the presence of alkyl halide can give catalyst regeneration or redispersion of sintered Au catalysts. The selectivity of alkyl halides, temperature and size distributions were investigated to elucidate the redispersion of Au NPs during halide-induced decomposition. This study proved that the alkyl halide induced the redispersion of sintered Au NPs which depended on the R–X (X = I, Br, Cl) bond dissociation energy (BDE) and thus provided a simple descriptor for the regeneration of inactive supported Au catalysts. A correlation between the BDE of R–X and dispersion efficiency was established. The tendency for disintegration and redispersion followed the R–X BDE of the alkyl halide. Compared to alkyl chlorides and bromides, iodides were more efficient for redispersing sintered Au NPs. As a descriptor, the BDE of R–I played a crucial role in particle redispersion. These findings provided insights into the mechanism of organic halide-induced Au NP disintegration and the effect of the halide type on the redispersion of sintered catalysts.
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