Small
·
2021
·Vol. 18
·期 8
·2106323
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IF 13.281
Jingwei Zhu,Benlin He,Xinpeng Yao,Haiyan Chen,Yanyan Duan,Jialong Duan,Qunwei Tang
The precise phase control of Cs-Pb-Br derivatives from 3D CsPbBr 3 to 0D Cs 4 PbBr 6 highly determines the photovoltaic performance of all-inorganic CsPbBr 3 perovskite solar cells (PSCs). Herein, the preferred phase conversion from precursor to Cs-Pb-Br derivatives is revealed by theoretically calculating the Gibbs free energies (∆ G ) of various phase conversion processes, allowing for a simplified multi-step solution-processable spin-coating method to hinder the formation of detrimental 0D Cs 4 PbBr 6 phase and enhance the photovoltaic performance of a PSC because of its large exciton binding energy, which is regarded as a recombination center. By further accelerating the interfacial charge extraction with a novel 2D transition metal dichalcogenide ReSe 2 , the hole-free CsPbBr 3 PSC achieves a champion efficiency of 10.67% with an impressive open-circuit voltage of 1.622 V and an excellent long-term stability. This work provides an in-depth understanding on the precise Cs-Pb-Br perovskite phase control and the effect of derivatives on photovoltaic performance of advanced CsPbBr 3 PSCs.
研究领域:
材料科学
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光伏技术
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纳米材料
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能源化学
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半导体物理
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DOI
高影响因子
INORGANIC CHEMISTRY
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2021
·
IF 5.165
Wenhao Xing,Chunlan Tang,Pifu Gong,Jieyun Wu,Zheshuai Lin,Jiyong Yao,Wenlong Yin,Bin Kang
The continuous exploration of multinary chalcogenide semiconductors has provided a variety of new functional materials. In this paper, four new quaternary chalcogenides AHgPS4 (A+ = Na+, K+, Rb+, Cs+) have been prepared by solid-state syntheses. These findings complement the lack of research on this quaternary system. Influenced by the size effect of cations and the coordination mode of Hg, the four compounds crystallize in four different space groups [NaHgPS4, P4̅n2; KHgPS4, Pnn2; RbHgPS4, P21/n; CsHgPS4, P212121] and show an interesting evolution from a 3D framework structure to a 1D chain structure. Moreover, all of these compounds feature noncentrosymmetric (NCS) structures except for RbHgPS4. The materials exhibit wide band gaps of 2.7 eV < Eg < 3.0 eV. The NCS- related second-harmonic-generation (SHG) property of NaHgPS4 and KHgPS4 was also studied. They display strong powder SHG responses (3.14 × AgGaS2 for NaHgPS4; 4.15 × AgGaS2 for KHgPS4), which indicate their intriguing potential as IR nonlinear-optical materials. Moreover, first-principles theoretical calculations were performed to understand the structure–property relationships of these materials.
研究领域:
材料科学
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无机化学
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非线性光学
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固态化学
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晶体学
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DOI
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CHEMICAL ENGINEERING SCIENCE
·
2026
·
IF 5.1
Taijia Li,Guichun He,Mengfei Liu,Zhiwen Cao,Jie Min
Selective separation of 90 Sr 2+ and 137 Cs + from nuclear wastewater is a significant challenge in the field of environmental remediation. In this paper, magnetic P-type zeolite composites loaded with Fe 3 O 4 were successfully synthesized via an alkali fusion-assisted hydrothermal method using lithium porcelain clay tailings (LPCT) as the silicon-aluminum source, achieving resource utilization of solid waste. The material exhibited excellent selective adsorption capacity for Sr 2+ : under the conditions of pH = 6 and a dosage of 2 g/L, the removal rate for Sr 2+ (100 mg/L) reached 99.4%, while that for Cs + (50 mg/L) was only 55.2%. In simulated/real seawater systems, the material maintained exceptionally high selectivity for trace Sr 2+ (with a K d value of 1.265 L·g –1 in simulated seawater). Mechanistic studies revealed that Sr 2+ undergoes specific ion exchange primarily by substituting Na + within the zeolite framework (adsorption energy: −2.37 eV), forming stable chemical bonds; in contrast, Cs + binds only through weak physical adsorption (adsorption energy: −0.85 eV), making it susceptible to displacement by competing ions. After five cycles, the Sr 2+ removal rate remained above 65%. This study presents a strategy for upcycling solid waste into high-performance functional materials and offers a promising solution for the efficient and selective separation of radioactive Sr 2+ from complex aqueous environments, highlighting its potential for practical nuclear wastewater treatment.
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DALTON TRANSACTIONS
·
2026
·
IF 3.3
Hussin Elkik,Muhammad Mujahid Iqbal,Aqsa Munawar,Zhihua Yang,Fangfang Zhang,Shilie Pan
The development of robust strategies for designing high-performance ultraviolet (UV) birefringent materials has become a critical challenge. The combination of alkali metal and Ca2+ cations, which do not exhibit d–d or f–f transitions, with [NO3]− anions that possess high polarizability anisotropy results in the synthesis of three hydrated alkali metal calcium nitrates, ACa(NO3)3·2H2O (A = NH4, Rb, Cs). The title compounds were synthesized at room temperature using the water solution–evaporation technique, featuring a unique chain-like structure composed of [CaO9] polyhedra and [NO3]− units. The compounds exhibit notable optical properties, including short UV absorption edges (220–235 nm) and moderate birefringence (0.077–0.086 at 546 nm). Detailed structural investigation and theoretical analyses reveal that the birefringence is primarily due to the planar triangular arrangement of the [NO3]− groups. This research not only increases the structural diversity within inorganic materials but also provides a key approach for further studies of all-inorganic birefringent optical materials in the UV region.
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PubMed
高影响因子
Journal of Physical Chemistry Letters
·
2026
·
IF 4.5
Yao Fu,Jia Xu,Huifang Han,Zhenxu Sun,Xueqi Zhang,Kun Lang,Fan Shen,Yahan Wu,Xu Pan,Jie Yan,Jianxi Yao
The crystallization kinetics of all-inorganic perovskites critically influence the photovoltaic performance. Here, we introduce formamidinium acetate (FAAC) as a multifunctional additive to promote the conversion of DMAPbI3 and Cs4PbI6 intermediates into high-quality black-phase γ-CsPbI3 thin films. FAAC reduces the formation energy of the Cs4PbI6 intermediate, enabling its early formation during initial heating. Concurrently, FA+ cations rapidly intercalate into the DMAPbI3 lattice, forming a mixed (FA, DMA)Pb(I, AC)3 phase that facilitates complete cation exchange between DMA+ and Cs+ and accelerates DMAI removal. This synergistic effect effectively reduces residual DMA+ and structural defects. The optimized FAAC-based CsPbI3 perovskite solar cells (PSCs) achieve a power conversion efficiency (PCE) of 21.84%. Furthermore, the unencapsulated devices exhibit excellent operational stability, retaining 90% of their initial efficiency after 500 h under ambient conditions and 88.7% after 120 h of thermal aging at 85 °C.
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高影响因子
CHEMISTRY OF MATERIALS
·
2021
·
IF 9.811
Zhongnan Guo,Fan Sun,Danilo Puggioni,Yubo Luo,Xiaotong Li,Xiuquan Zhou,Duck Young Chung,Erjian Cheng,Shiyan Li,James M. Rondinelli,Wenxia Yuan,Mercouri G. Kanatzidis
Metal cluster compounds have garnered renewed interest in the search for novel superconductors and topological semimetals owing to structural instabilities of metal-cluster geometries and broken symmetries. Here we synthesized needle-like crystals of the V-cluster-based quasi-one-dimensional (Q1D) materials AV3Q3Oδ (A = K, Rb, Cs, Q = Se, Te) which can also be viewed as being composed of parallel nanowires. We examine how changes in their average and local structure control their electronic properties. All compounds crystallize in the TlFe3Te3-type structure (P63/m space group) with infinite (V3Q3)− double-walled columnar chains separated by A+ cations. Our single-crystal and synchrotron powder diffraction studies indicate oxygen atoms partially occupy the center site of the V6 octahedral metal cluster cages in KV3Te3O0.33, RbV3Te3O0.32, and CsV3Te3O0.35, whereas KV3Se3 is structurally oxygen-free. Our synchrotron X-ray pair distribution function (PDF) analyses indicate that the oxygen-free V6 cluster octahedra in KV3Se3 are highly distorted perpendicular to the chain direction even at room temperature, reducing the symmetry of the average structure from hexagonal P63/m to monoclinic P21/m. Our theoretical calculation supports this P21/m distortion and suggests the structure further distorts to P21 or P21/c at lower temperatures. In contrast, the oxygen-centered V-cluster in KV3Te3O0.33 exhibits a V3-triangle-trimerization along the chain direction. This feature is discernible from the local PDF and is consistent with lattice dynamical calculations based on density functional theory. Resistivity measurements indicate that KV3Se3 exhibits metallic behavior, whereas a dramatic metal–semiconductor–metal transition emerges in KV3Te3O0.33, RbV3Te3O0.32, and CsV3Te3O0.35 because of oxygen disorder and changes in local structure captured from our electronic structure analyses of the Fermi surface. Our investigation of the AV3Q3Oδ family demonstrates the importance of understanding local changes in structure driven by electronic instabilities, which can guide the search for new quantum materials in other low-dimensional cluster-compound materials.
研究领域:
材料科学
·
凝聚态物理
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JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Yuqi Wang,Yi He,Hongjie Li,Jing Yu,Liyun Zhang,Li Chen,Yang Bai
Filtration membranes, with excellent anti-fouling capability, are ideal for actual oily sewage treatment, but the absence of a pre-hydration procedure is still a challenge. In this study, we demonstrated an environmentally friendly, and economical route to solve this problem by depositing chitosan (CS)-cellulose nanocrystals (CNCs) multilayer on stainless steel mesh (SSM) via simple layer-by-layer (LBL) self-assembly method. Due to the chemical structure , the CNCs have a large number of hydrophilic groups that are tightly bound to the surface, so the CS-CNCs multilayer modified mesh can maintain their strong surface hydration ability in air or oil, and will not be contaminated by crude oil even in a dry state. Besides, the CS-CNCs multilayer modified mesh exhibits superamphiphilic, underwater superoleophobic, and under-oil superhydrophilic functions. Moreover, the modified mesh also shows high rejection rate for crude oil/water mixture (99.92%) and diverse oil-in-water emulsions (>99.58%). What's more, the mesh has excellent reusability and chemical stability. The outstanding advantages in low-cost, environmental protection, biodegradability, anti-crude-oil-fouling performance, and efficient oil/water separation, endow our CS-CNCs multilayer modified mesh with great potential in complicated oily sewage purification.
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产品关联
DOI
高影响因子
Polymer-Plastics Technology and Materials
·
2021
·
IF 2.371
Dina F. Katowah,Gharam I. Mohammed,Waheed A. Adeosun,Abullah M. Asiri,Mahmoud A. Hussein
This paper reports an electrochemical sensor developed based on cross-linked polyaniline/(chitosan-oxidized single-walled carbon nanotube-graphene oxide/copper oxide) nanocomposite (C-PANI/(OXSWCNTs-GO-CS)/CuO NCs) for detection of a 4-chlorophenol (4-CP). The NCs synthesized by an in-situ chemical polymerization method and characterized by various techniques include XRD, FTIR, SEM-EDX, HR-TEM, TGA-DTG, DTA and cyclic voltammetry. A 4-CP selective electrochemical sensor was fabricated by coating a glassy carbon electrode (GCE) with synthesized NCs. The experimental results reported here displayed the good electrochemical property toward 4-CP oxidation with a detection limit of 0.13 µM (S/N = 3) and good current stability. It also had an impressive percent recovery of the spiked 4-CP in real environmental samples. The improved sensing performances were attributed to the formation of the network structure of C-PANI/(OXSWCNTs-GO-CS)/CuO NCs. Therefore, this study presents a sensitive and promising 4-CP electrochemical sensor for water quality management and human health protection.
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高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2020
·
IF 5.162
Yongjing Xu,Bo Liu,Liming Zou,Chenkai Sun,Wengang Li
In order to achieve the electrospinning of chitosan in common organic solvents, amino-reserved CS-g-PCL was synthesized by one-step method. PLLA and dichloromethane/ethanol (CH 2 Cl 2 /EtOH) solvent were chosen to prepare a series of different compositions of PLLA/CS-g-PCL mats (8/2, 6/4, 4/6, 2/8 wt/wt%) by electrospinning. The SEM showed that the smooth defect-free and uniform nanofibers were collected except PLLA/CS-g-PCL 2/8 and pure CS-g-PCL, and the fiber diameter was decreased from 828 nm to 461 nm with the increasing content of CS-g-PCL. The mechanical properties of composite mats have decreased with increasing CS-g-PCL content, but much higher than neat PLLA. The water contact angle, water absorption rate, water-vapor transmission rate and in vitro degradation behavior were 129°–19°, 109%–482%, 1945–2517 g m −2 day −1 and 4–14%, respectively. The addition of CS-g-PCL imparted PLLA/CS-g-PCL electrospun mats on better properties, improving the nature defects of PLLA. The in vitro cell culture studies showed that PLLA/CS-g-PCL 6/4 exhibited a higher in vitro biocompatibility and a better ability for cell attachment, spreading, and proliferation, comparing with PLLA mats. Herein, PLLA/CS-g-PCL 6/4 electrospun mats with excellent performance, was considered the potential application as wound dressing in skin tissue engineering.
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DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2018
·Vol. 25
·期 22
·22244-22258
·
IF 2.8
Yan Xuechao,Zhang Xiaoping,Li Qian
In this paper, an effective chitosan/beta-cyclodextrin/nanometer zinc oxide (CS/β-CD/Nano-ZnO) composite porous membrane was synthesized by sol-gel and polymer-assisted inverting method. Preparation conditions of CS/β-CD/Nano-ZnO were investigated by single-factor and Box-Behnken response surface methodology optimizing triethoxyvinylsilane (JH-V151), beta-cyclodextrin (β-CD), and nanometer zinc oxide (Nano-ZnO), and applied to study the adsorption characteristics of Cong red (CR) from aqueous solution using batch experiments. The optimum preparation conditions were determined that the volume fraction of JH-V151 alcohol solution was 11%, the ratio of β-CD to CS was 5.35, and the ratio of Nano-ZnO’s mass to solution’s volume was 0.36%. Different characterization methods including field-emission scanning electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, UV-visible spectroscopy, and Universal Materials Tester were used to prove the appearance, crystallinity, functional groups, swelling degree, transmittance, and tensile property of CS/β-CD/Nano-ZnO. The optimized batch experimental parameters were 50 mg L −1 , 4 h, 7.0, 0.5 g L −1 , and 55.0 °C as initial concentration, contact time, pH, adsorbent dose, and temperature, respectively. The maximum adsorption capacity on CR reached 96.33 mg g −1 , which is 4.34 times with respect to CS. The batch experimental data were best described by a pseudo-second-order kinetics model and Langmuir isotherm model ( R 2 = 0.9965, theoretical saturated adsorption capacity 147.28 mg g −1 ). The values ∆G were − 2.09, − 4.73, and − 7.37 kJ mol −1 at 298, 308, and 318 K temperatures, respectively. The ∆H value was 76.68 kJ mol −1 , indicating the endothermic and spontaneous adsorption in nature. The ∆S value was 0.26 kJ mol −1 K −1 , a signal of entropy increase during adsorption. The adsorption capacity decreased only by 5.8% after six recycling runs, which indicated the reusability of CS/β-CD/Nano-ZnO. Therefore, the CS/β-CD/Nano-ZnO composite porous membrane is a promising membrane material for the efficient removal of CR from any water at large and economic scales at moderate concentration.
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CHEMISTRY OF MATERIALS
·
2017
·
IF 9.466
Bin-Wen Liu,Min-Yi Zhang,Xiao-Ming Jiang,Shu-Fang Li,Hui-Yi Zeng,Guo-Qiang Wang,Yu-Hang Fan,Yong-Fei Su,Chunsen Li,Guo-Cong Guo,Jin-Shun Huang
Two new polar polyselenides Rb4Ge4Se12 (1) and Cs4Ge4Se12 (2) with rarely reported dimeric [Ge2Se4(μ-Se2)]4– units were synthesized. They present large second-harmonic generation (SHG) intensities of 7.5 and 6.5 times that of the benchmark AgGaS2 with type I phase-matching behavior, high laser-induced damaged thresholds, a wide transmission region and congruently melting behavior, making them excellent candidates for IR nonlinear optical (NLO) applications. The SHG functional motifs of both compounds are determined to be [Ge2Se4(μ-Se2)]4– unit by time-dependent density functional theory calculation, which further reveals that charge transfers from the lone pairs of terminal Se atoms to the five σ* orbitals of five-membered ring Ge2Se3 have a predominant contribution to the total SHG effect.
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高影响因子
RSC Advances
·
2017
·Vol. 7
·期 64
·40227-40236
·
IF 3.108
Ran Li,Qing-Da An,Zuo-Yi Xiao,Bin Zhai,Shang-Ru Zhai,Zhan Shi
In view of the sustainable character and high-density of reactive sorption sites, a new kind of poly(ethylenimine)/chitosan (PEI/CS) aerogel beads were successfully synthesized using controllable sol–gel and freeze drying methods, with the aim of using them for efficient Cr(VI) removal from aqueous acid solutions. Compared with the reported CS-based sorbents for hexavalent chromium [Cr(VI)], not only is the synthetic process used simple but the bead-like samples could be easily separated from solutions for recycling. Structural characterization and batch experiments were compared to illustrate the adsorption performance of the aerogel beads which were synthesized using various processes. Out of the three samples (CS–glutaraldehyde (GA), CS–GA–PEI and CS/PEI–GA beads), the one referred to as CS–GA–PEI exhibited the highest adsorption capacity and the maximum amount of Cr(VI) removal was 402.9 mg g−1 at pH 2.0 and 298 K. The pseudo-second-order and Langmuir model preferably fitted the adsorption process best. After five cycles of desorption–regeneration tests, more than 80% of Cr(VI) could still be removed by these newly designed CS–GA–PEI beads. Adsorption mechanisms could be explained using electrostatic attraction and reduction reaction theories, on the basis of comprehensive analysis. More importantly, taking advantage of the micrometer sized particles and three-dimensional network that developed, fixed-bed column tests were also conducted on the resultant bead-like sample, which also exhibited excellent sorption performance under testing conditions. These superiorities of CS–GA–PEI beads make them a potential candidate for use in remediating the pollution caused by Cr(VI) ions.
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危险品化学品经营许可证（带存储）