Advanced Optical Materials
·
2021
·Vol. 9
·期 24
·2101333
·
IF 9.926
Kunjie Liu,Chenkai Deng,Chunxiao Li,Xusheng Zhang,Jindong Cao,Jiyong Yao,Jing Zhao,Xingxing Jiang,Zheshuai Lin,Quanlin Liu
Organic–inorganic metal halides (OIMHs) with unique structural flexibility possess excellent photoelectric properties. They are regarded as next-generation photovoltaic materials, phosphors, semiconductors, and ferroelectrics. The metal-halide units in OIMHs are good microscopic building blocks of nonlinear optical crystals for laser wavelength conversion. However, most OIMHs are absent from nonlinear optics owing to their macroscopic nonlinear optical (NLO)-inactive centrosymmetric crystal structure. In this study, two new lead-free OIMHs, (TMEDA)SbI 5 and (TMEDA)BiI 5 (where TMEDA 2+ is N , N , N ′-trimethylethylenediammonium), having 1D structure, crystallized in the orthorhombic system with a non-centrosymmetric P 2 1 2 1 2 1 space group, are synthesized. Remarkably, upon 2090 nm laser irradiation, both compounds possess a strong infrared (IR) nonlinear optical response of the same magnitude as AgGaS 2 , which is a benchmark semiconductor-type nonlinear optical crystal. In addition, under the excitation of ultraviolet and visible lights, both compounds produce self-trapped exciton-induced red-light emission. First-principles electronic structure calculations reveal that the optical properties originate from the electronic transitions within the inorganic metal-halide group. The obtained results indicate that both compounds are potential photoelectric materials for laser frequency conversion and fluorescence, and the observation of NLO effect in these two compounds verifies that OIMHs are also good candidates for NLO crystals.
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Photonics Research
·
2021
·Vol. 9
·期 11
·2182-2189
·
IF 7.08
Shunfa Gong,Ruirui Wu,Sen Yang,Lifang Wu,Minmin Zhang,Qiuju Han,Wenzhi Wu
The toxicity and instability of lead halide perovskite seriously limit its commercial application in lighting, although it has high photoluminescence (PL) efficiency and adjustable emission. Here, lead-free bismuth (Bi) and antimony (Sb) codoped Cs2SnCl6 (BSCSC) microcrystals (MCs) are prepared successfully by a solvothermal method. The PL spectrum is composed of dual emission bands with the peak at 485 and 650 nm, of which relative intensity can be tunable through the change of Bi and Sb feeding contents, respectively. Because of the phonon–electron interaction, the PL intensity is enhanced as the temperature rises within the range of 80–260 K. Then, the nonradiative transition is intensified until 380 K, which results in decrease in PL intensity. Simultaneously, combining with time-resolved PL, it is concluded that the emission peak at 485 nm is attributed to the [BiSn+VCl] as the luminescent centers with the lifetime of hundreds of nanoseconds, and the emission peak at 650 nm is attributed to microsecond-timescale self-trapped excitons. The maximum values of relative sensitivity (SR) and absolute sensitivity (SA) values obtained are 3.82% K−1 and 5.11 ns ·K−1, which for the first time to our knowledge demonstrate that BSCSC MCs can be novel luminescent materials for developing better optical thermometry. White-light-emitting diodes (WLEDs) are constructed using BSCSC MCs only combined with an LED chip, the Commission Internationale de L’Eclairage color coordinates of which are (0.30, 0.37). It provides a novel scheme for the lighting field to realize WLEDs without adding additional commercial phosphors.
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INORGANIC CHEMISTRY
·
2021
·
IF 5.165
Hang Ruan,Zhongnan Guo,Jiawei Lin,Kunjie Liu,Lingling Guo,Xin Chen,Jing Zhao,Quanlin Liu,Wenxia Yuan
The Pb-free hybrid-layered-double perovskites (HLDPs) have been proposed as green and stable semiconducting materials for optoelectronic devices, but the synthesized members are still limited. Here, we report the synthesis of three new HLDPs, (C8H20N2)2AgMBr8 (M = In, Sb, and Bi), by a solution method using 1,4-bis(ammoniomethyl)cyclohexane (C8H20N22+) as the organic spacing cation. All three of these HLDPs show ⟨100⟩-oriented layered structures with Ag and In/Sb/Bi order arranged in corner-sharing octahedral layers. The first-principle calculations indicate the indirect-gap nature of (C8H20N2)2AgInBr8 and (C8H20N2)2AgSbBr8, while their Bi counterpart shows a direct band gap after considering spin–orbit coupling. The band gaps obtained by diffuse-reflectance spectroscopy are 3.11, 2.60, and 2.70 eV for M = In, Sb, and Bi, respectively. (C8H20N2)2AgInBr8 shows a broadband red emission centered at 690 nm, and it is mainly attributed to the self-trapped-excitons mechanism. Our results not only provide a series of new “Pb-free” HLDPs with chemical diversity but also help us to further understand the structure–property relationships of HLDP materials.
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高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Mei-Ling Xu,Xiao-Jie Jiang,Jia-Ran Li,Fu-Ji Wang,Kui Li,Xin Cheng
Considering the flexibility, adjustable pore structure, and abundant active sites of metal–organic frameworks (MOFs), rational design and fine control of the MOF-based hetero-nanocrystals is a highly important and challenging subject. In this work, self-assembly of a 3D hollow BiOBr@Bi-MOF microsphere was fabricated through precisely controlled dissociation kinetics of the self-sacrificial template (BiOBr) for the first time, where the residual quantity of BiOBr and the formation of Bi-MOF were carefully regulated by changing the reaction time and the capability of coordination. Meanwhile, the hollow microstructure was formed in BiOBr@Bi-MOF through the Oswald ripening mechanism to separate photogenerated electron–hole pairs and increase the adsorption capacity of Bi-MOF for dyes, which significantly enhanced the photocatalytic degradation efficiency of RhB from 56.4% for BiOBr to 99.4% for the optimal BiOBr@Bi-MOF microsphere. This research broadens the selectivity of semiconductor/MOF hetero-nanocrystals with reasonable design and flexible synthesis.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2021
·Vol. 168
·期 8
·082504
·
IF 4.316
Shangkun Deng,Ziliang Li,Kang Xu,Zhu Liu,Zhuangzhuang Yin,Hai Yu,Jianguo Lv,Lei Yang,Zhaoqi Sun,Miao Zhang
In this paper, the electrocatalytic efficiency of bi-metallic organic framework compounds grown on nickel foam (NF) has been enhanced by adjusting the amount of iron and cobalt precursors. A unique wedge-like morphology was observed in Fe-1-Co-1-MOF. The optimized Fe-1-Co-1-MOF (1:1 of molar ratio of iron to cobalt) exhibits superior catalytic activity to oxygen evolution reaction (OER) performance with a lowest overpotential of only 233 mV at a current density of 10 mA·cm−2 and the higher current density of 400 mA·cm−2 can be provided at overpotential of 264 mV. The Tafel slope in alkaline aqueous solutions was 24.4 mV·dec−1. After 10 h of continuous operation, the catalyst showed only a slight loss of current density at 50 mA·cm−2. This success may be attributed to synergy between the bi-metallic organic framework catalyst and the large pores of conductive nickel foam, as well as the synergistic effect between the two phases molecules of the bi-metallic organic framework metal.
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MATERIALS & DESIGN
·
2021
·
IF 7.991
Weiwei Lan,Mengjie Xu,Miao Qin,Yizhu Cheng,Ya Zhao,Di Huang,Xiaochun Wei,Yongchang Guo,Weiyi Chen
Osteochondral defect regeneration was a great challenge because of limited self-repaired ability for its sophisticated hierarchical inner structure. Hereon, the bi-layer hydrogel with robust osteochondral interfacial bonding was formulated under fully physical crosslinking, which was consisted of polyvinyl alcohol/collagen II for cartilage layer and polyvinyl alcohol/biphasic calcium phosphate/carbon nanotubes for bone layer. The bi-layer hydrogel with irregular pore distribution showed decreased pore size from top to bottom. The tensile modulus of bi-layer hydrogel reached to 7.14 ± 3 MPa and the stretched fracture surfaces were always appeared in the upper hydrogels, proving bi-layer hydrogels' well interfacial bonding strength. Furthermore, hydrogels' biocompatibility was evaluated using two kinds of cells in vitro, and the repair performance was also assessed in vivo test. The results demonstrated the bi-layer hydrogel owned favorable cytocompatibility and could induce the formation of osteochondral regeneration. Additionally, the max load at defect section reached to 67.24 ± 36.06 N after 12 weeks regeneration, verifying well bonding strength between the neotissue and native adjacent tissues. This work revealed the favorable bi-layer hydrogel owed great potential in repairing osteochondral defects.
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Nanoscale
·
2021
·Vol. 13
·期 20
·9270-9279
·
IF 7.79
Yuanyuan Dong,Chenxing Xu,Lei Zhang
Herein, we reported a label-free and reliable photoelectrochemical (PEC) platform for highly selective monitoring of norepinephrine (NE) based on metallic Bi nanoparticles anchored on hollow porous ZnSnO3 microspheres (3D Bi/ZnSnO3) via a simple solvothermal strategy. The designed 3D Bi/ZnSnO3 Schottky junction exhibited a unique photoanodic response toward NE among other catechol derivatives, such as epinephrine (EP) and dopamine (DA), and effectively shielded the interference from thirteen coexisting biomolecules like uric acid (UA) and ascorbic acid (AA). High selectivity and excellent sensitivity could be correlated to the unique chelating coordination interaction between NE and Zn2+ at surface sites as well as the efficient carrier separation of Bi/ZnSnO3, thereby developing a novel “signal-on” label-free and selective strategy for NE detection. The proposed Bi/ZnSnO3-based PEC sensor achieved remarkable NE biosensing with a low detection limit of 0.68 nmol L−1 and a wide response ranging from 0.002 to 350.0 μmol L−1. The applicability of this biosensor was realized for the selective analysis of NE in human serum, human urine and injection samples, laying the foundation for the label-free PEC monitoring of NE in biological fluids.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 138
·期 42
·51253
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IF 3.125
Hao Wang,Yihang Gao,Xuhong Jia,Quanyi Liu
Present polymer inhibitors depend on a major inhibitory group to restrain bentonite hydration, and monomer design is concerned to improve the inhibition and stability through complex copolymerization. Conveniently, a homopolymer (PIL-NH 2 ) that contained primary amine and cationic imidazolium as bi-functional groups was proposed, aiming to provide two synergistic inhibitory modes. Comprehensive methods were conducted to characterize the chemical structure and inhibitory performance of PIL-NH 2 . The ζ potential absolute value of bentonite suspension was decreased by PIL-NH 2 from 28.7–33.3 mV to 4–7 mV, and the increment of bentonite particle size d 50 was observable from 1.83892 μm to over 200 μm. With water squeezed out, the lattice spacing d 001 of hydrated bentonite was reduced from 1.9070 to 1.2683 nm due to PIL-NH 2 intercalation. The ESEM images revealed that inhibited bentonite showed a tight structure with classical dehydration phenomenon, and the hydrogen bond between PIL-NH 2 and bentonite was further confirmed according to the FT-IR result. In mechanism analysis, the electrostatic attraction and hydrogen bond existed simultaneously for PIL-NH 2 to adsorb bentonite. The two adsorption modes from bi-functional groups were synergistic to improve inhibition remarkably. PIL-NH 2 maintained high performance during the whole hydration process, including crystalline hydration, osmotic hydration, and hydrated dispersion.
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ChemSusChem
·
2021
·Vol. 14
·期 16
·3293-3302
·
IF 8.928
Dawei Zhao,Yimin Xuan,Kai Zhang,Xianglei Liu
Graphical Photocatalytic CO 2 reduction : Benefiting from the synergistic effect of local high electron density at active sites and thermodynamic bicarbonate assistance, the hierarchical Bi@Bi 2 MoO 6 composite simultaneously shows good photocatalytic CO 2 reduction activity and high ethanol selectivity (92 %). Furthermore, bicarbonate ions play an important role in the formation of long-chain products due to the C−C coupling between derivative carbene intermediates and other carbon-containing intermediates. Photocatalytic CO 2 reduction is a sustainable and inexpensive method to solve the energy crisis and the greenhouse effect. However, the major stumbling blocks such as poor product selectivity, low yield of the multi-carbon products, and serious recombination of electron-hole pairs hinder practical application of photocatalysts. Herein, a high-performance Bi@Bi 2 MoO 6 photocatalyst, Bi nanoparticles grown on the surface of Bi 2 MoO 6 nanosheets with oxygen vacancies, was fabricated via a simple solvothermal approach. Benefiting from the abundant active sites and effective separation of photogenerated carriers of Bi 2 MoO 6 nanosheets, and the localized surface plasmon resonance effect of Bi nanoparticles, the Bi@Bi 2 MoO 6 sample exhibited great photocatalytic CO 2 reduction activity. Furthermore, adding NaHCO 3 into the system not only significantly increased the C 2 H 5 OH generation rate but also enhanced the product selectivity. In the photocatalytic measurement (0.17 mol L −1 CO 2 -saturated NaHCO 3 solution), the highest formation rates of CO, CH 3 OH, and C 2 H 5 OH were reached at 0.85, 0.59, and 17.93 μmol g −1 h −1 (≈92 % selectivity), respectively.
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MICROCHEMICAL JOURNAL
·
2021
·
IF 4.821
Daixiong Zhang,Qing Xiang
In this work, a Sn-Bi film was successfully fabricated via the electrophoretic deposition (EPD) of nano-Sn powders and nano-Bi powders in an ethanol dispersion medium. Study on film composition showed that a coefficient of proportionality between the mass ratio in the deposited film and that in the suspension was observed for the EPD of Sn-Bi, which controlled the composition of the Sn-Bi film. Therefore, Sn-Bi films with different mass ratios were designed with this linear relationship for the codetection of Cd(II) and Pb(II). Square-wave anodic stripping voltammetry (SWASV) measurements using an in-situ plating strategy were performed after the electrochemical oxidation of Sn and Bi at 0.3 V for 120 s, and the results indicated that the Sn-Bi film with a mass ratio of 0.75 had the best determination ability.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Zong Li,Yujie Feng,Yunfei Li,Xuepeng Chen,Nan Li,Weihua He,Jia Liu
CO 2 electrochemical reduction (CO 2 ER) can convert CO 2 into value-added liquid fuel, which can not only mitigate the global warming problem caused by CO 2 , but also can be used for energy storage in the form of intermittent renewable energy. High-performance catalysts are required in order to efficiently conduct electrochemical carbon dioxide reduction under mild conditions. In this work, the bimetallic bismuth and tin were deposited on the copper mesh via a simple and speedy electrodeposition strategy and assessed as electrocatalysts for the conversion of CO 2 to formate. The Bi 5 Sn 60 electrode (bismuth deposition time of 5 min, tin deposition time of 60 min) exhibited an excellent catalytic activity with a remarkably high Faradaic efficiency of 94.8% and partial current density of 34.0 mA cm −2 at − 1.0 V vs RHE. More intriguingly, it exhibited a remarkable formate production rate of 634.3 μmol cm −2 h −1 that outperformed most of the reported electrocatalysts. The pine needle-shaped dendritic structures could provide a considerable surface area and massive active sites. The fast electron transfer was of great benefit to the formation of CO 2 • − intermediate. The metal oxide/metal metastable interface was conducive to stabilizing the CO 2 • − intermediate and inhibiting the hydrogen evolution reaction (HER) process. Moreover, the optimized electronic structure strengthened the pathway related to the OCHO • intermediate, thereby boosted the conversion of CO 2 to formate. The results demonstrated that the dendrite structured Bi/Sn bimetallic catalysts would be a promising candidate for high-efficiency CO 2 reduction.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 138
·期 14
·50165
·
IF 2.52
Junjun Zhang,Huajun Duan,Jianfan Cao,Jiahao Zou,Huiru Ma
A high-efficiency DOPO-based reactive flame retardant (DPE) with bi-hydroxyl was successfully synthesized via reacting DOPO with imine obtained from the condensation of ethanolamine and 1,4-phthalaldehyde, and used as co-curing agent to improve the fire safety of epoxy resin (EP). Its chemical structure was characterized by Fourier transform infrared (FTIR) spectra, 1 H, 31 P nuclear magnetic resonance (NMR) spectra and elemental analysis. The curing behavior, thermal properties, flame-retardant properties of EP/DPE systems were investigated. The results revealed that DPE slightly decreased the glass transition temperature ( T g ), but accelerated the curing cross-linking reaction of EP. Furthermore, DPE decreased thermal degradation rate of epoxy matrix and promoted the formation of residual char at high temperature. After adding DPE, the flame retardant of epoxy thermosets was greatly improved. Especially, the thermoset modified with 5 wt% DPE achieved limiting oxygen index (LOI) value of 33.6% and V-0 rating in UL-94 test, demonstrating the highly efficient flame retardancy. While its peak heat release rate (PHRR), total heat release (THR) and total smoke production (TSP) were respectively decreased by 32.6%, 17.8%, and 13.9% compared with neat EP. Moreover, the research on flame retardant mechanism disclosed that DPE played dual flame-retardant effect in the gaseous and condensed phases.
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