Inorganic Chemistry Frontiers
·
2024
·
IF 6.1
Zhiyuan Li,Xiangjun Wang,Peng Zhao,Jingquan Liu,Xiangxin Tian
Two-dimensional perovskites have demonstrated superior application prospects in optoelectronic fields, such as X-ray detection, light emitting diodes, and photovoltaics, as their tunability of band structures, improved stability, fast responses, and suppressed noise signal. In this work, bulk single crystals of MA3Bi2Br9 (MA+=CH3NH3+) and its two mixed crystal MA3Bi2(Br0.74I0.26)9, MA3Bi2(Br0.62I0.38)9 were successfully grown using the bottom-seeded solution growth method. MA3Bi2I9 crystals were also prepared and characterized for comparisons. X-ray diffraction analysis revealed that all the crystals had quasi-two-dimensional (2D) structures and the partial substitution of I- for Br- did not alter the space group symmetry. However, with the increase of I- concentrations, the incongruently melting temperature gradually decreased from 342 oC for MA3Bi2Br9 to 328 oC for MA3Bi2(Br0.62I0.38)9, respectively. For optoelectronic properties, the MA3Bi2Br9 was measured to have a direct bandgap of 2.60 eV, while the values decreased to 2.15 eV for MA3Bi2(Br0.74I0.26)9, 2.04 eV for MA3Bi2(Br0.62I0.38)9, and 1.97 eV for MA3Bi2I9, respectively. Similarly, the photoluminescence peaks blue-shifted from 550 nm for MA3Bi2Br9, to 453 nm for MA3Bi2(Br0.74I0.26)9, 445 nm for MA3Bi2(Br0.62I0.38)9, and 444 nm for MA3Bi2I9, respectively. Due to the strong dielectric confinement effects and anisotropic exciton transportation characteristics of the 2D structures, the targeted crystals studied all exhibited ultrafast fluorescence decay characteristics, where decay time as short as 0.65 ns the sub-nanosecond, for MA3Bi2Br9, 1.06 ns for MA3Bi2(Br0.74I0.26)9, 3.00 ns for MA3Bi2(Br0.62I0.38)9, and 3.12 ns for MA3Bi2I9, respectively, were observed. Besides, the low dimensional structures also brought the crystals superior environmental stability as the suppressed ion migrations. This work provides simple, straightforward method for the large-sized crystal growth of low dimensional MA3Bi2X9 (X-=Br-, I-), and reveals their promising application prospects in novel optoelectronic fields.
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2024
·
IF 3.7
Qiongyuan Zhang,Yanping Wang,Jilong Han,Haining Liu,Huifang Zhang,Zhijian Wu,Siyuan Zhang,Wenjie Han,Xiushen Ye
Layered double hydroxides (LDHs) have garnered significant attention from researchers in the field of adsorption due to their unique laminated structures and ion exchange properties. LDHs with various anion intercalation showed different adsorption effects on adsorbing ions, but the corresponding adsorption mechanisms are ambiguous. In this study, three types of NiAl-LDHs were synthesized, utilizing NO3–, CO32–, or Cl– as the interlayer anions. Batch tests were conducted to study their adsorption performances for Br–. Among them, the LDH with a NO3– intercalation layer exhibited the highest adsorption capacity for Br–, reaching up to 1.40 mmol g–1. The adsorption kinetics, mechanism, and renewability of these NiAl-LDHs were systematically compared. As a result, the type of Br– adsorption by all three materials was single molecular layer chemisorption. Moreover, the thermodynamic results of adsorption suggested that the adsorption of Br– was a spontaneous exothermic process. X-ray photoelectron spectroscopy, X-ray diffraction, and point of zero charge analysis collectively indicated that the adsorption of Br– by LDHs primarily occurred through interlayer ion exchange and electrostatic interactions. Structural characterizations of the adsorbents revealed that Br– entered the interlayers of the three LDHs, causing varying degrees of reduction in the interlayer spacing. Density functional theory calculations indicated that the interlayer binding energy of LDH with NO3– intercalation was the lowest, thereby making it more susceptible NO3– to be exchanged with Br–. Finally, the stability of the NiAl-LDHs was studied. The NiAl-LDHs retains a high removal efficiency of Br– even after 5 cycles of adsorption and desorption.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Yongfeng Liu,Yupeng Ying,Qingyu Xie,Zhaoju Gao,Xiuwen Shao,Min Zhou,Wei Pei,Xiaosheng Tang,Yusong Tu
Mixed-halide CsPb(Br/Cl)3 perovskite quantum dots (PeQDs) have attracted extensive attention in light-emitting diodes (LEDs), but their low photoluminescent efficiency and especially poor stability impede their practical applications. Here, we employ bifunctional didodecyldimethylammonium thiocyanide (DDASCN) with a pseudohalogen SCN– and branched DDA+ to obtain blue-emitting CsPbBr2Cl PeQDs. DDASCN significantly boosts the photoluminescence quantum yield to 92% by inhibiting nonradiative recombination. Importantly, DDASCN PeQDs show excellent stabilities against air, UV light, heat, and polar solvents. These improved performances were explained by density functional theory calculation, which shows that SCN– fills the Cl– vacancy by simultaneously binding with undercoordinated Pb2+ and Cs+, while DDA+ connects undercoordinated Br– and lies parallel to the PeQD core, leading to efficient passivation and a strong binding capacity. Finally, we achieved high-performance white LEDs by integrating our PeQDs, resulting in a color-rendering index of 92.9, a color gamut of 119.61%, and chromaticity coordinates of (0.33, 0.33). This provides an effective method to obtain efficient and stable CsPb(Br/Cl)3 PeQDs for practical applications.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ChemSusChem
·
2024
·
IF 7.5
Ke-An Wang,Zhen-Long Wang,Hai-Bin Zhu
Graphical Efficient electrosynthesis of methyl formate is achieved through the facile reaction between formaldehyde produced from anodic methanol oxidation, and methoxy bromide which is in-situ generated by reaction of Br 2 from anodic oxidation of Br − and methoxide from cathodic methanol reduction. This method features high atomic economy only producing valuable methyl formate and hydrogen gas. Methyl formate (MF) is one of the most important chemical commodities, which has a wide range of applications. Due to environmental friendliness, mild reaction conditions, and easy operations, electrosynthesis of MF has garnered increasing attention in recent years. In this work, we reported an electrosynthesis route toward MF in a halide-containing methanol solution. The thorough mechanistic investigations point out that electrosynthesis of MF is accomplished by instant reaction between aldehyde from anodic methanol oxidation, and methoxy bromide (CH 3 OBr) that is in-situ generated by reaction of Br 2 from anodic oxidation of Br − with methoxide (CH 3 O − ) from cathodic reduction of methanol. This method features high atomic economy only producing valuable MF and hydrogen gas, and shows distinct advantages compared to the reported MF electrosynthesis methods. Even at 200 mA/cm 2 , the faradaic efficiency (FE) of MF remains consistently around 60 % at the anode while a 100 % FE hydrogen gas is produced at the cathode.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Jingzhen Su,Yong Wang,Cong Li,Zhengming He,Kai Zhang,Mingqiang Ren,Qile Wang,Tianxing Chen,Jibran Ali Ghumro,Virender K. Sharma,Hyunook Kim,Yunshu Zhang
Natural seawater contains abundant halide ions that remain largely untapped, while peracetic acid often requires activation to enhance its oxidative properties. The interaction mechanisms between these components have not been thoroughly investigated. This study investigated the activation effect of high concentrations of Cl − and Br⁻ coexisting in seawater on PAA by adding PAA to seawater. Quenching experiments, along with Electron Paramagnetic Resonance (EPR) spectroscopy and UPLC-TQ-MS, were conducted to determine the reaction mechanism and degradation process of SMX. Seawater systems containing 35 ‰ salinity or Br − -PAA systems (0.5 mM Br − ) degraded 100 % SMX within 10 min or 12 min, respectively ( k obs =0.4873 min⁻ 1 or 0.3581 min⁻ 1 ). While the Cl − -PAA system, though slower, still degraded 97.7 % within 180 min (300 mM Cl − , k obs =0.0173 min⁻ 1 ). SMX degradation rates remained above 95 % across the pH range of 3–9, with optimal performance at pH= 3. However, the presence of HA inhibited SMX degradation efficiency by over 40 %. Results indicate that SMX degradation efficiency correlates positively with Cl⁻/Br⁻ content and PAA concentration. The superior removal efficiency stems from activated PAA not only generating HOCl and HOBr via oxygen atom transfer but also further producing 1 O 2 , which dominates the non-selective degradation process. This approach adapts to a wide pH range but is consumed by coexisting HA. The superiority of the Br − -PAA system over Cl − -PAA stems from the strong oxidizing power of HOBr. The oxidation pathways include halogenation, bond cleavage, and hydroxylation. ECOSAR predictions indicated that most transformation products exhibited higher toxicity than the parent SMX compound.
✓ 已验证
产品关联
DOI
高影响因子
Chemistry-Switzerland
·
2025
·Vol. 7
·期 3
·75
·
IF 2.4
Jing Zhang,Xiaoxing Ji,Qingxiu Yu,Xixi Zhang,Chuanlin Li,Na Li,Mengzhen Kong,Dingzheng Li,Wenjie Liu,Chenggang Wang,Xijin Xu
Zinc-halogen batteries are usually based on two-electron transfer reactions from X−to X2. However, the halogen is capable of being further oxidized to higher valence states, thereby achieving the higher capacity of zinc- halogen batteries. Here, a six-electron reaction based on I−/I+and Br−/Br0is activated successfully by introducing KI into the electrolyte. ZIF-8-derived porous carbon (ZPC), serving as the host of halogen, effectively suppresses polybromide/polyiodide shuttle owing to the chemisorption/physical adsorption. Additionally, the adsorption of I−on the surface of the zinc anode effectively inhibits the growth of dendrites and the formation of by-products. Consequently, zinc-bromine batteries exhibit outstanding electrochemical performance, including a specific capacity of 345 mAh g−1at 1 A g−1and an excellent capacity retention of 80% after 3000 cycles at 2 A g−1. This strategy provides a novel way for enhancing the electrochemical performance of zinc-halogen batteries.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2021
·
IF 5.467
Lin Yuan,Yufeng Zhou,Ze Wang,Enrou Mei,Xiaojuan Liang,Weidong Xiang
Colloidal lead halide perovskite nanocrystals (NCs) have recently emerged as versatile photonic sources. However, their performance stability has been far from the requirements, and this type of material is toxic to the environment after degradation. In this paper, a hot injection strategy was used to prepare a CsPbX 3 perovskite NC solution, wherein the photoluminescence quantum yield (PLQY) of CsPbBrI 2 reached 78% and that of CsPbBr 3 was 63%. Then, CsPbX 3 NCs are successfully adsorbed on natural layered mineral pyrophyllite for improving heat, light, and water stability. Monodispersed CsPbX 3 NCs are evenly distributed on the surface of the pyrophyllite sheet in a high-density manner, which possibly originates from the electrostatic attraction effect of abundant anions on the surface of pyrophyllite to CsPbX 3 NCs. In a series of CsPbX 3 @pyrophyllite nanocomposites prepared, the PLQYs of green-emitting CsPbBr 3 and red-emitting CsPbBrI 2 were 47% and 29%, respectively. The materials were employed to fabricate white light-emitting diodes (WLEDs) with a wide color gamut of 117%. Importantly, because of the swelling and cation-adsorbent properties of pyrophyllite, the dissolution of lead in water was greatly reduced, which plays a certain role in ecological protection.
研究领域:
材料科学
·
环境科学
·
光学工程
✓ 已验证
DOI
高影响因子
Polymer Chemistry
·
2025
·
IF 3.9
Chaoyue Shan,Haohao Zhang,Yan Gao,Hui Wang,Li Han,Yuanyuan Du,Wen He,Mingyuan Pang,Xing Gao,Yen Leng Pak
Reversible addition–fragmentation chain transfer (RAFT) polymerization enables precise regulation of polymer chain growth and active center distribution. This study adopted a two-step approach with RAFT polymerization followed by quaternization to synthesize antibacterial materials, specifically tunable porous polymers PCaPE(Br) and PCaPE(I). The work focused on the structure–activity relationship between RAFT-derived block structures and the antibacterial properties of these materials. RAFT-mediated polymerization precisely controlled the block copolymer precursor PE-PDE, which is PEMA-b-P(DMAEA-co-EGDMA), and this control facilitated the subsequent formation of ordered porous structures. When the molar ratio of poly(ethyl methacrylate) (PEMA) to ethylene glycol dimethacrylate (EGDMA) was set to 1 : 6, the final quaternized products PCaPE2(Br) and PCaPE2(I) exhibited porous and fluffy microstructures. These microstructures were characterized by large specific surface area and high porosity. This structure, combined with uniformly distributed quaternary ammonium salt groups from the quaternization of N,N-dimethylaminoethyl acrylate (DMAEA) tertiary amine groups, enhanced the contact between antibacterial active sites and bacteria as well as antibacterial efficacy. PCaPE(Br) and PCaPE(I) showed excellent broad-spectrum antibacterial activity against E. coli and S. aureus. They also maintained good reusability with over 95% activity retention after five cycles. Such advantages support their prospects in biomedicine, agricultural antibacterials and wastewater treatment.
✓ 已验证
产品关联
DOI
高影响因子
Green Chemical Engineering
·
2021
·
IF 0
Yanlin Zhang,Xinyu Zhang,Guangren Yu,Xiaochun Chen,Ahmed A. Abdeltawab,Hany El-Hamshary
Ionic liquids have been extensively studied as solvents or catalysts for oxidative desulfurization (ODS) of diesel fuel, but it is still a challenge to reduce the desulfurization time and steps. In this work, a new highly efficient desulfurization system composed of CoFe 2 O 4 magnetic nanoparticle, [HMIM]Br-FeCl 3 and H 2 O 2 was developed for the ODS of FCC diesel fuel. The desulfurization performances were investigated including desulfurization time, temperature, volume ratio of IL/oil, O/S molar ratio, dosage of CoFe 2 O 4 , FeCl 3 content in ILs, regeneration, and reuse of catalyst and solvent. Owing to the coupled catalytic roles of CoFe 2 O 4 magnetic nanoparticle and [HMIM]Br-FeCl 3 , where Co 2+ and Fe 3+ interact with H 2 O 2 to produce • OH radical that converts S-compounds into sulfone and sulfoxide compounds, such a desulfurization system is highly effective in removing S-compound in diesel fuel. The S-content in FCC diesel fuel was reduced from the original 272.8 ppm to 0.5 ppm with 99.82% S-removal efficiency after one step within 8 min under the optimal conditions of 25 °C, 8 min, V (IL/oil) = 1:10, O/S = 20, 5 wt% CoFe 2 O 4 dosage and n ([HMIM]Br)/ n (FeCl 3 ) = 1:1; the desulfurization performance is much better in desulfurization time and steps than other desulfurization systems reported previously. The desulfurization system can be regenerated and reused without remarkable loss of desulfurization activity. A desulfurization mechanism was proposed.
研究领域:
化学工程
·
环境科学
·
材料科学
✓ 已验证
DOI
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Weiying Zhou,Fuwang Mo,Zishan Sun,Jiabao Luo,Jiaqi Fan,Hongni Zhu,Zhenpeng Zhu,Jinqing Huang,Xinguo Zhang
Carbon dots (CDs) with long-wavelength-emission and high quantum yield (QY) are the focus of current research, compared with widely-investigated blue-emitting CDs. Herein, bright red-emitting CDs were synthesized by hydrothermal reaction at 200 °C for 3 h. CDs prepared by p-Phenylenediamine (pPD) exhibits a weak red band at 635 nm under an excitation wavelength of 450 nm. Adding (NH 4 ) 2 HPO 4 and KBr as P and Br precursors, the red emission peak at 610 nm, which shows a peak blue-shift about 25 nm with a dramatic emission enhancement up to 20-folds by co-doping of P, Br atoms into CDs. The corresponding QY value of P, Br-doped CDs (P, Br-CDs) was greatly improved to 11.3% as compared to bare CDs’ (0.55%). Furthermore, P, Br-CDs show a remarkable luminescent turn-off response after adding copper ions (Cu 2+ ). In addition, the quenched luminescence of P, Br-CDs/Cu 2+ complex could be recovered by the chelation between Cu 2+ and L -cysteine ( L -Cys) after adding L -Cys. This fluorescence “ON-OFF-ON” protocol could be applied for sequent Cu 2+ and L -Cys detection, and offer a linear range of 0–150 μM and 0–100 μM with a limit of detection of 4.408 µM and 2.373 µM for Cu 2+ and L -Cys, respectively. All results indicate that P, Br-CDs are of great potential for further biological and environmental application.
研究领域:
材料科学
·
分析化学
·
纳米技术
✓ 已验证
DOI
高影响因子
Science China-Chemistry
·
2026
·
IF 9.8
Huang Kuniadi Wandy,Vo Dat-Nguyen,Yin Xunyuan
Shipboard CO 2 capture (SCC) systems using MEA/[TBA][Br] solvent lack experimental studies and efficient data-driven optimization frameworks that minimize regeneration energy while maintaining high CO 2 capture rates. This study conducts cyclic experiments and develops a deep neural network (DNN)-based framework to optimize operating conditions for shipboard-relevant carbon capture. In the first stage, 70 experimental samples are collected under varying [TBA][Br] concentration, desorber temperature, and liquid-to-gas (L/G) ratio to train a surrogate DNN model. This model is used to formulate an optimization problem, from which an optimal operating zone is identified. In the second stage, 28 additional experiments are performed within this operating zone, and the full 98-sample dataset is used to train a refined DNN model, featuring three hidden layers with hyperparameters tuned via grid search and evaluated using an 80−20 training-test split. Optimization using the refined DNN identifies the optimal condition at [TBA][Br] concentration of 2.96 wt%, a desorber temperature of 120 C, and an L/G ratio of 1.73 kg/kg, corresponding to more than 90% CO 2 capture and a regeneration energy of 2.94 GJ/t CO 2 . This optimal performance corresponds to an 11.40%–34.87% reduction in regeneration energy compared to baseline MEA in this study and MEA-based SCC systems from the literature. The refined DNN demonstrates strong predictive capability, achieving MAPE values of 1.27% (training) and 1.41% (test) for CO 2 capture rate, and 0.83% (training) and 1.04% (test) for regeneration energy. Sensitivity analysis highlights the influence of all three variables: [TBA][Br] addition reduces sensible and vaporization heat requirements, higher L/G ratios improve CO 2 capture rates, and elevated desorber temperatures simultaneously enhance CO 2 capture rates and lower regeneration energy. Moreover, ATR-FTIR analysis over 15 cycles confirms solvent chemical stability with no evidence of chemical degradation. This work demonstrates an effective machine learning-enabled optimization strategy for SCC with MEA/[TBA][Br] solvent and offers insights into developing energy-efficient SCC systems and a framework extendable to other CO 2 emission sources.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2025
·Vol. 36
·期 36
·2307
·
IF 2.8
Zhang Huayushuo,Ma Qian,Gao Pan,Li Bolong,Yang Xiaoxia,Li Chao,Song Mingming,Hou Zhiwei,Jiang Xiaomei
X-ray detection has extensive applications in medical imaging, scientific research, and security inspection. Despite the superior radiation detection properties of lead-based perovskites, including high carrier mobility and superior attenuation efficiency, their toxicity and instability arising from ion migration hinders further development. To address these challenges, a series of halogen-tuned lead-free 3-methylpiperidine bismuth halides, (C 6 H 14 N) 3 Bi 2 I 9 , (C 6 H 14 N) 2 BiBr 5 and (C 6 H 14 N) 2 BiCl 5 (C 6 H 14 N = 3-methylpiperidine) single crystals were grown and systematically characterized. 3-methylpiperidine was selected for its steric effect stabilizing the lattice, and the synergistic tuning through halogen variation enabled a structural transition along with modulation of their properties. Notably, the lateral-structured (C 6 H 14 N) 3 Bi 2 I 9 single-crystal X-ray detector exhibits a sensitivity of 388.05 μC Gy −1 cm −2 , a low detection limit of 71.05 nGy s −1 , and a small dark current drift of 2.16 × 10 –8 nA cm −1 s −1 V −1 . Importantly, this material retains its original morphology after 8 months of storage in ambient conditions. Furthermore, flexible X-ray devices fabricated via spin-coating (C 6 H 14 N) 3 Bi 2 I 9 exhibited a favorable X-ray response with a sensitivity of 121.48 μC Gy −1 cm −2 , as well as excellent mechanical stability. This work reveals that halogen tuning effectively optimizes the structure and performance of Bi-based perovskites, providing valuable insights for advancing them in X-ray detection applications.
研究领域:
材料科学
·
辐射探测
·
钙钛矿电子学
·
半导体器件
·
柔性电子学
✓ 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）