PHYSICAL CHEMISTRY CHEMICAL PHYSICS
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2020
·Vol. 22
·期 35
·19697-19703
·
IF 3.43
Jingmei Min,Ailijiang Abudurusuli,Junjie Li,Shilie Pan,Zhihua Yang
Crystals with both large birefringence and wide transparent range are suitable for broad applications in the areas of optical communications, the laser industry and modulation of the light polarization requirement. In this work, to assist the design of urgently needed crystals with large birefringence in the infrared (IR) region, typical alkali-metal chalcogenides, KPSe6, Na2Ge2Se5, and Li2In2GeSe6 have been studied. They exhibit a hierarchical characteristic in the calculated birefringence by about 0.21, 0.11, and 0.04, respectively. To explore the origin of the birefringence difference, the polarizability anisotropy and the effect of electron distribution anisotropy are analyzed. The alkali-metal chalcogenides KPSe6, Na2Ge2Se5, and Li2In2GeSe6 feature infinite one-dimensional (1D) chains of [PSe6], 2D anionic framework of [Ge2Se5] layers and 3D [In2GeSe9] networks, respectively. It is found that the anionic group with low-dimensional configuration could enhance polarizability anisotropy and render large birefringence for the macroscopic structure. This provides evidence that a low-dimensionality configuration in the structure would be beneficial for the enhancement of optical anisotropy, which can motivate the exploration and design of novel IR birefringent materials.
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Nanoscale
·
2020
·Vol. 12
·期 45
·23013-23027
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IF 6.895
Ziqian Wang,Chenyue Zhan,Fang Zeng,Shuizhu Wu
Rheumatoid arthritis (RA) is a common chronic autoimmune disease associated with progressive disability, systemic complications, and poor prognosis. The improved understanding of the roles of immune signaling pathway inhibitors has shed light on designing new and more effective approaches for RA treatment. In this work, an inflammation-responsive and molecularly targeted drug system has been developed for RA therapy. The drug carrier was synthesized by covalently grafting hydrophobic cholesterol (Chol) molecules onto a hydrophilic chondroitin sulfate (CS) chain via the inflammation-responsive diselenide bonds (SeSe). The resultant amphiphilic polymer CSSeSeChol readily forms nanoparticles (NPs) and encapsulates two kinase inhibitors tofacitinib and SP600125 in aqueous media. Upon administration into the RA mouse model, the nanodrug accumulates in RA lesions and releases the inhibitors for regulating the JAK-STAT and JNK pathways. As a result, the nanodrug exhibits satisfactory efficacy in RA treatment by suppressing the expression of relevant pro-inflammatory cytokines, blocking the activation of osteoclasts and providing protection for cartilage and joints.
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Nanoscale
·
2020
·Vol. 12
·期 39
·20536-20542
·
IF 6.895
Jie Chen,Taoyi Liu,Deyu Bao,Bin Zhang,Guang Han,Can Liu,Jun Tang,Dali Zhou,Lei Yang,Zhi-Gang Chen
Searching for new-type, eco-friendly, and Earth-abundant thermoelectric materials, which can be used as an alternative to the high-cost bismuth telluride, is important for near-room-temperature applications. In this work, nanostructured monoclinic Cu2Se with a low carrier concentration has been synthesized by a wet mechanical alloying process combined with spark plasma sintering. Such a low carrier concentration, which originates from the effectively suppressed Cu deficiencies during the fabrication process, induces a relatively low electrical conductivity and carrier thermal conductivity. Besides, the nanostructured grains combined with point defects and phonon resonance enhance the phonon scattering to induce a low lattice thermal conductivity without sacrificing the electrical transport properties. As a result, our nanostructured monoclinic Cu2Se obtains a figure of merit of 0.72 at 380 K with good thermal stability. This work indicates that nanostructured monoclinic Cu2Se is a promising near-room-temperature thermoelectric material.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2020
·
IF 7.489
Changlin Li,Shangrong Chen,Xiangxiang Gao,Wei Zhang,Yanfang Wang
The photoelectrochemical (PEC) performance of ZnO is restricted by its low light absorption ability and high recombination rate of photogenerated carriers. In order to overcome these drawbacks, ZnO/CdS/CdSe heterostructures are prepared on Zn foil substrate using facile three-step methods containing hydrothermal growth, successive ionic layer adsorption reaction (SILAR) and modified chemical bath deposition (CBD). The effects of process parameters containing the number of SILAR cycles of CdS, sensitization sequence of CdS and CdSe, and precursors of CdSe on PEC performance of ZnO/CdS/CdSe heterostructures, and ZnO NRAs on PEC performance of CdS/CdSe co-sensitizer have been scrutinized. Through CdS and CdSe co-sensitization, a layer of CdS/CdSe nanofilm is conformally deposited on ZnO nanorod arrays (NRAs) observed by transmission electron microscopy (TEM). Both the visible-light absorption ability and separation efficiency of photogenerated carriers of ZnO NRAs are significantly enhanced evidenced by UV–vis diffuse reflectance absorption spectra , photoluminescence (PL) spectra and electrochemical impedance spectra. Due to the synergistic effect of ZnO NRAs and CdS/CdSe co-sensitizer, the ZnO/CdS/CdSe heterostructures with five SILAR cycles and one modified CBD cycle (ZnO-CdS5-CdSe) show efficient PEC properties with photocurrent density of 6.244 mA/cm 2 at −0.2 V vs Ag/AgCl under light illumination of 100 mW/cm 2 , which are 57.28 and 4.73 times higher than those of pristine ZnO NRAs and CdS/CdSe clusters, respectively. Moreover, the photoconversion efficiency and incident photon to current conversion efficiency (IPCE) of the ZnO-CdS5-CdSe photoanode reach 4.381% and 80.92%, respectively. The heterostructures based on Zn foil substrate in this study can be a promising candidate for practical PEC application and other applications such as photocatalytic degradation and solar cell due to its low manufacturing cost, large-scale production and efficient PEC ability.
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Nano Energy
·
2020
·
IF 16.602
Yi Liu,Qingguo Feng,Wei Liu,Qian Li,Yuchao Wang,Biao Liu,Lirong Zheng,Wei Wang,Lin Huang,Limiao Chen,Xiang Xiong,Yongpeng Lei
For electrocatalytic hydrogen evolution reaction (HER) in alkaline media , it is urgently needed to accelerate the generation of H*. Here, using Se doped phosphides inside nitrogen doped carbon (skin-core structure) as catalysts, the HER performance in alkaline electrolyte was improved. The overpotential of 261 mV at 400 mA cm −2 was among the top level reported so far. Based on the combination of experimental results and density functional theory (DFT) calculations, the interior CoSe phase generated by Se modification provides faster charge transfer from the inner to carbon layer , facilitating the rate-determining step (Volmer). Also, the needle-like nanowire array facilitates the H 2 desorption at a large current density. Furthermore, a solar-to-hydrogen efficiency up to 10.2% was demonstrated. This work may provide an effective strategy to boost the reaction kinetics via accelerating interfacial charge transfer ability of electrocatalysts .
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INORGANIC CHEMISTRY
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2020
·
IF 4.825
Xiao Shao,Yue Wu,Shuang Jiang,Bin Li,Tianyong Zhang,Yong Yan
Three-dimensional (3D) nanomaterials have been intensively investigated because of their unique properties and wide range of potential applications; however, the ligand-induced chirality in 3D semiconductor nanocrystals has been scarcely studied. In this paper, we report the synthesis of hydrophobic 3D CdSe nanotetrapods (Tps) with a high degree of uniformity in their morphology by using the hot-injection method. The core and arms of Tps are distinct in their crystal structure, thus creating an intracrystal heterojunction. The size of Tps, primarily the length of four arms, is controlled by changing the amount of didecyldimethylammonium bromide and reaction time. Next, enantiopure cysteine ligands were introduced to replace the hydrophobic native stabilizers to prepare chiral l- and d-cysteine-capped CdSe Tps. Importantly, the circular dichroism (CD) line shapes of l/d-cysteine-capped CdSe Tps are assigned to the different excitonic transitions of the core and arms, respectively. In addition, the observed CD activities are found to be sensitive to the size of the CdSe Tps, where the anisotropic g factors have increased and reached the maximum value at a moderate aspect ratio (AR) and a further increase of the AR leads to a decrease of the g factor. Because of charge transfer between the core and arms, we propose a plausible mechanism potentially responsible for the induced CD line shapes in terms of the excitonic states of Tps with two different crystal structures. We believe that chiral 3D nanomaterials with anisotropic morphologies could offer new opportunities for relevant applications.
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Environmental Science-Nano
·
2020
·Vol. 7
·期 12
·3877-3887
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IF 7.683
Wanjun Wang,Wenquan Gu,Guiying Li,Haojing Xie,Po Keung Wong,Taicheng An
Sustainable and “green” technologies for hydrogen peroxide (H2O2) production have aroused increasing interest, yet challenges prevail in production of H2O2 for environmental applications. In this study, tungsten selenide (WSe2) with a few-layered microstructure was used as a new co-catalyst to synthesize H2O2 under visible light irradiation. The ultrathin WSe2 nanosheets were anchored onto a g-C3N4 surface by in situ growth solvothermal methods. The as-prepared WSe2/g-C3N4 showed remarkably enhanced H2O2 production efficiency without organic electron donors, which was 11.8 times higher than that of pristine g-C3N4. H2O2 was generated via O2 reduction mediated by photogenerated e−, and dissolved O2 could be generated by water oxidation and in situ used to produce H2O2 under anaerobic conditions. The introduction of WSe2 not only promoted visible light absorption, but also facilitated the charge transfer efficiency by forming a Z-scheme rather than a type II heterojunction. The photogenerated e− was enriched onto WSe2, leading to the high H2O2 production activity. Moreover, the in situ generated H2O2 could be directly used for pathogenic bacteria inactivation through Fenton reactions without external H2O2 addition. This work is expected to open an avenue for developing novel photocatalysts towards sustainable H2O2 production for water disinfection and related environmental applications.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2020
·
IF 4.65
Minglu Li,Chaozhu Shu,Anjun Hu,Jiabao Li,Yu Yan,Miao He,Jianping Long
Lithium-oxygen batteries (LOBs) are considered to be one of the most competitive energy storage devices due to their high theoretical energy density . However, challenges including poor catalytic activity and durability of the oxygen electrode seriously hinder the in-depth development of LOBs. Adjusting the surface electronic structure of the oxygen electrode provides a new prospect for realizing highly efficient electrocatalysts . In this contribution, we report that atomic-scale palladium (Pd) involving in MoSe 2 (Pd–MoSe 2 ) is capable of adjusting the in-plane electron density of MoSe 2 via spontaneous interface chemical reactions, thereby accelerating the electron migration along the in-plane direction. The synergy between the created Se vacancies and Pd atoms can further increase the electroactive sites on the Pd–MoSe 2 surface, which is conducive to improving the catalytic activity of the electrode and thereby accelerating the kinetics of oxygen electrode reactions. The results show that Pd–MoSe 2 based LOBs exhibit excellent electrochemical performance such as high Coulombic efficiency (97.81%) as well as extended cycle life (1952 h). This work shows that the adjustment of in-plane electron density by exotic metal atom is a viable strategy to improve the catalytic activity of layered transition metal selenide, which provides the possibility of developing highly efficient electrocatalysts for LOBs.
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APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Baodeng Yang,Jiao Yang,Zhi Huang,Lizhao Qin,Hua Lin,Qing Li
Thin Cu 2 Se hexagonal sheets (HSs) with large-size were obtained via a convenient green route by using Ascorbic acid (AC) as a reducing agent and β-CD as a surfactant. The crystal structure and optical properties of the Cu 2 Se HSs were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectrometer (XPS) and ultraviolet–visible spectrophotometer (UV–Vis). An NTH (Nucleation-Triangle-Hexagonal) mechanism for the formation of the Cu 2 Se hexagonal sheets was proposed. The final morphology of the Cu 2 Se HSs was determined by both β-CD and the growth rates of different crystal planes. The as-prepared Cu 2 Se HSs show good photocatalytic performance on degrading of Methylene blue (MB) under visible light.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2020
·
IF 16.683
Ke Wang,Zipeng Xing,Du Meng,Shiyu Zhang,Zhenzi Li,Kai Pan,Wei Zhou
Inadequate separation of carriers is still major obstacles to the practical application of photocatalysis. The reasonable design of semiconductor photocatalysts is expected to break through this bottleneck. Herein, MoSe 2 @Bi 2 S 3 /CdS is designed by solvothermal-hydrothermal strategy. Thanks to the dual Z-Scheme heterojunction conforms to the characteristics of multi-channel charge transfer which favor the spatial separation of carriers. MoSe 2 @Bi 2 S 3 /CdS hollow structure increases the utilization rate of light source, the core-shell structure increases the interface area and the active sites. Moreover, full spectrum absorption endues MoSe 2 @Bi 2 S 3 /CdS with unpredictable photothermal effect, which can touch off near-field temperature rise to facilitate photocatalytic process. Profiting from the synergistic facilitation effect, MoSe 2 @Bi 2 S 3 /CdS exhibits excellent photocatalytic activity in the hydrogen evolution and pollutants removal of Cr (VI) and 2,4,6-trichlorophenol (TCP), which are up to 11.84 mmol/g/h, 98.7% and 99.2%, respectively. This dual functional MoSe 2 @Bi 2 S 3 /CdS photocatalyst may paves new opportunities for solving the energy crisis and environmental pollution.
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JOURNAL OF PHYSICS D-APPLIED PHYSICS
·
2021
·Vol. 54
·期 11
·115504
·
IF 3.207
Xi-Kai Yang,Jia-Wei Qiao,Zhi-Hao Chen,Zhen-Chuan Wen,Hang Yin,Xiao-Tao Hao
We adopt inorganic semiconducting CdSe quantum dots (QDs) as a third component in the PTB7-Th:PC71BM-based organic solar cells due to their advantages of strong absorbance, high conductivity, and good solution processability. With the blending of low-dosage CdSe QDs, the short-circuit current density (Jsc) and power conversion efficiencies can be improved by 13% and 11%, respectively, in the ternary device. Compared with the control device, CdSe QDs can effectively modulate the charge dynamics and lead to enhanced fluorescence external quantum efficiency. Moreover, effective Förster resonance energy transfer and fast charge transfer can be observed in the CdSe QD-based bulk-heterojunction (BHJ) films, and therefore improve the overall performance of the organic photovoltaic devices. This work provides an effective method by adopting CdSe QDs to fabricate high-performance PTB7-Th:PC71BM BHJ solar cells.
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ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Bin Li,Haoyu Hu,Han Hu,Congcong Huang,Dongqing Kong,Yanpeng Li,Qingzhong Xue,Zifeng Yan,Wei Xing,Xiuli Gao
Lithium-ion capacitors (LIC) have problems such as the imbalance of electrochemical kinetics between the battery-type anode and the capacitive cathode, and the large change in the working potential of the hard carbon anode during charge and discharge, which limit the improvement of electrochemical performance for LIC. To solve these problems, CoSe 2 nanoparticles embedded nitrogen-doped hard carbon microspheres (NCS-CoSe 2 ) are synthesized and used as the anode material of LIC. Electrochemical tests show that NCS-CoSe 2 has a reversible specific capacity of as high as 500 mAh g −1 at a current density of 1 A g −1, which can effectively stabilize the working potential of the anode. At a high working voltage window of 2.2–4.5 V, the potential change of the NCS-CoSe 2 anode is as low as 0.35 V, significantly smaller than that of the pure hard carbon (0.87 V). Regarding the electrode kinetics, the NCS-CoSe 2 anode is matched with the active carbon cathode well. When the power density rises sharply from 335 W kg −1 to 6700 W kg −1 , the energy density of NCS-CoSe 2 //AC LIC can attain 82 Wh kg −1 (56.9% of initial energy density).
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