Nano Energy
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2020
·
IF 16.602
Jun Jiang,Ying-Jie Zhang,Xiao-Jiao Zhu,Shu Lu,Lu-Lu Long,Jie-Jie Chen
FeNi-based nanomaterials with bimetallic alloying effect deliver a great promise as an efficient electrocatalyst for oxygen evolution reaction (OER). However, the reconstruction to generate in-situ catalytically FeNi-based oxides or hydroxides during OER process and high electrical conductivity demand foster the great pursuit of the rational design of FeNi-based OER electrocatalyst a big challenge. Herein, we design and fabricate a nanostructured metallic FeNi 2 S 4 as a highly efficient OER electrocatalyst. This catalyst exhibits an overpotential of (250 mV) and a Tafel slope (62 mV dec −1 ), that outperforms the benchmark of commercial RuO 2 . The experimental results demonstrate that the alloying effect and the superior electrical conductivity , endow it a great electrocatalytic performance. Such a nanostructured metallic OER electrocatalyst shows a great promise in water splitting.
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Frontiers in Oncology
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2020
·
IF 4.848
Li Ke,Li Peng,Wang Yang,Han Shuang
Postoperative recurrence is a common and severe problem in the treatment of gastric cancer; consequently, a prolonged course of chemotherapy treatment is inevitable. Monitoring by imaging could provide an accurate evaluation of the therapeutic effects, which would be beneficial to guide a treatment strategy adjustment over time. However, current imaging technologies remain insufficient for the continuous postoperative monitoring of gastric cancer. In this case, molecular imaging offers an efficient strategy. Targetable contrast agents are an essential part of molecular imaging, which could greatly enhance the accuracy and quality of monitoring. Herein, we synthesized a Mn-based contrast agent for magnetic resonance imaging (MRI) of gastric cancer monitoring. Initially, small-sized Mn3O4 nanoparticles (NPs) were synthesized. Then, a functionalized polyethylene glycol (PEG) lipid was attached to the surface of the Mn3O4 NPs, to improve biocompatibility. The targetable MRI contrast agent (Mn3O4@PEG-RGD NPs) was further prepared by the conjugation of the arginine-glycine-aspartic acid (RGD) peptides. The completed Mn3O4@PEG-RGD NPs had the small size of 7.3 ± 2.7 nm and exhibited superior colloidal stability in different solution environments. In addition, Mn3O4@PEG-RGD NPs exhibited reliable biotolerance and low toxicity both in vitro and in vivo. Imaging experiments amply demonstrated that Mn3O4@PEG-RGD NPs could efficiently accumulate in gastric cancer tissues and cells via RGD mediation, and immediately significantly increased the MRI effects. Through this study, we can conclude that Mn3O4@PEG-RGD NPs have the potential to be a novel MRI contrast agent for the postoperative monitoring of gastric cancer.
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PubMed
高影响因子
Journal of Materials Chemistry C
·
2020
·Vol. 8
·期 35
·12302-12307
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IF 7.059
Xuyuan Bao,Mingze Li,Jing Zhao,Zhiguo Xia
CsPbI3 perovskite nanocrystals (NCs) are generally unstable, with low photoluminescence quantum yield (PLQY) and show deep red emission not suitable for optoelectronic applications. Herein, we propose a facile postsynthetic anion exchange method to enhance PLQY and stability via the controlled addition of ZnBr2 solution, in which the emission peak is adjusted from 690 nm to 550 nm and the PLQY was enhanced from about 50% to near unity (98%). We further unveiled the ion exchange kinetics of the rapid transitions between two phases (CsPbI3 and CsPbBrI2) within 40 minutes, and also demonstrated that the electron trap and hole trap transformed mutually with the increase of halogen enabling the variable PLQYs. Moreover, the as-prepared CsPbBrI2 NCs exhibit enhanced stability under UV irradiation and in water compared with that of pristine CsPbI3 NCs. The good stability and highly efficient narrow-band emission centered at 630 nm for CsPbBrI2 NCs show its potential application-possibility in liquid-crystal display backlight. It is suggested that the postsynthetic ZnBr2 halogen ion exchange method demonstrated here opens a new door for the synthesis of high-performance halide perovskite nanocrystals and the development of illumination and display applications.
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CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Ruiqi Guo,Jie Meng,Weihua Lin,Aqiang Liu,Tönu Pullerits,Kaibo Zheng,Jianjun Tian
CuInSe 2 (CISe) colloidal quantum dots (QDs) display promising applications in photodetection especially within near-infrared (NIR) regions due to their high extinction coefficient and environmental-friendly. However, the high trap density and poor crystal quality introduced by the ternary structure result in low photodetection of CISe QDs devices. Herein, we dope transition metal manganese ions (Mn 2+ ) into CISe QDs to tackle the above problems. Structural characterization results demonstrate the crystal quality of CISe QDs is improved by doping Mn 2+ during the synthesis of QDs. The transient absorption (TA) spectroscopic study together with the space-charge-limited current (SCLC) measurements show the charge carrier lifetime of Mn-CISe QDs is much longer than that of the CISe QDs, due to the Mn 2+ doping state serve as hole capturer forming a charge-compensated pair with the Cu 2+ defect that makes the long-lived Cu 2+ radiative recombination dominate. Furthermore, Mn 2+ doping concurrently modifies the conduction band minimum and valence band maximum level of the QDs verified by the ultraviolet photoelectron spectroscopy (UPS), which determines the driving force for charge carrier transfer to acceptors. The optimal Mn 2+ doping level (0.01 Mn:Cu feed ratio) balanced the above two factors in the QDs. The detector based on such Mn-CISe QDs exhibits responsivity of 30 mA/W and specific detectivity of 4.2 × 10 12 Jones at near-infrared wavelength, the response speed of 0.76 µs, and suppressed dark current density of 1.6 × 10 −10 A cm −2 .
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 34
·14438-14446
·
IF 3.288
Rongmu Lv,Keke Du,Qianqian Liu,Xiangyu Meng,Lizhu Chen,Zhifei Wang
Efficiently, enhancing intracellular oxidative stress via increasing intracellular hydroxyl radicals (˙OH), which is based on the Fenton reaction and lowering glutathione (GSH) is a promising approach for cancer treatment. Herein, we synthesized a new alloy nanomaterial, Fe5Cu3O@BSA (FCB) with good dispersity aimed at introducing copper ions to improve the Fenton reaction efficiency and reduce GSH. Under the weak acid microenvironment at the tumor, FCB can release Fe2+ and Cu2+ and the released free electrons are expected to combine with oxygen to further generate H2O2, leading to an excessive production of H2O2 in the cells. Meanwhile, the released Fe2+ and Cu2+ can not only perform a higher reaction efficiency on producing ˙OH but also consume GSH, which dramatically increases the intracellular oxidative stress in both directions. In vitro experiments showed that the incubation of human breast cancer cells (MCF-7 cells) with 100 μg mL−1 FCB nanoparticles resulted in a 65.9% mortality rate after 24 h. The in vivo experiments showed that FCB could effectively inhibit tumor growth. In this study, a therapeutic strategy based on metal biomaterials with good biocompatibility was established to effectively enhance oxidative stress and has great potential in tumor treatment.
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高影响因子
ACS Nano
·
2020
·
IF 14.588
Shu Lu,Jun Jiang,Hai Yang,Ying-Jie Zhang,Dan-Ni Pei,Jie-Jie Chen,Yan Yu
Rechargeable batteries are promising platforms for sustainable development of energy conversion and storage technologies. Highly efficient multifunctional electrodes based on bimetallic sulfides for rechargeable batteries are extremely desirable but still challenging to tailor with controllable phase and structure. Here, we report a colloidal strategy to fabricate FeCo-based bimetallic sulfides on reduced graphene oxide (rGO), which are expected to display highly efficient oxygen electrocatalysis and sodium storage performances. Specifically, as-screened FeCo8S8 nanosheets (NSs) on rGO originating from suitable tailoring of the Co9S8 matrix with Fe at the atomic level exhibited a very low potential difference (0.77 V) at 10 mA cm–2 and negligible voltage loss after 200 cycles as an air electrode for Zn–air batteries. For Na–ion batteries, FeCo8S8 NS/rGO demonstrated a superior high-rate capability (188 mAh g–1 at 20 A g–1) with long-term cycling stability. The bifunctional electrocatalytic property and sodium storage performance are attributed to not only the synergistic effect of Fe/Co but also the optimized catalytic activity and ion transport ability by the in situ rGO hybrid. This work demonstrates the potential applications of FeCo-based bimetallic sulfides as efficient electrode materials for both rechargeable Zn–air and Na–ion batteries.
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高影响因子
Catalysis Science & Technology
·
2020
·Vol. 10
·期 23
·8094-8107
·
IF 5.721
Yonghai Feng,Congming Lu,Huijie Wang,Minjia Meng,Yunlei Zhang,Dewei Rao,Lei Liu,Hengbo Yin
The aerobic catalytic oxidation of 1,2-propanediol (PDO) over non-noble metal (e.g. Cu) based catalysts usually suffers serious C3 product dissociation at high temperature, thus showing low lactic acid (LA) selectivity. Here, an alternative anaerobic catalysis strategy over spinel copper–iron-oxide magnetic nanoparticles (CuFeOx MNs) with the coexistence of Cu(I) and Cu(II) dual sites is developed for the catalytic transformation of PDO to LA with a quantitative yield of co-product H2 in basic aqueous solution. The absence of O2 is beneficial for enhancing LA production in comparison with the presence of O2. The synergy between Cu(I) and Cu(II) sites in CuFeOx MNs is vital for improving the catalytic performance as compared to Cu2O or CuO catalysts with Cu(I) or Cu(II) sites alone. Cu1Fe1Ox MNs with a Cu/Fe mole ratio of 1/1 exhibit 94.5% LA selectivity and 72.6% PDO conversion at 160 °C for 8 h. Experimental results and DFT calculations suggest that the spinel CuFeOx MN based catalytic PDO transformation follows a favorable pathway of PDO → hydroxyacetone → lactaldehyde → lactic acid for LA production. In addition to the catalytic PDO transformation, the use of CuFeOx MNs can be extended to favor high activity and selectivity in the catalytic transformation of glycerol to LA (98.5% selectivity) and ethylene glycol to glyceric acid (97.8% selectivity). This work highlights the design of an alternative non-noble metal-based CuFeOx MN catalyst for efficiently catalyzing the transformation of bio-based polyols into value-added carboxylic acids.
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高影响因子
Journal of Materials Chemistry C
·
2020
·Vol. 8
·期 45
·16083-16091
·
IF 7.059
Wenzhen Lv,Mingchuan Xu,Lei Ge,Xun Zhu,Junxian Hong,Wei Huang,Runfeng Chen
In recent years, substantial progress has been made in the synthesis of colloidal CsPbX3 (X = Cl, Br, and I) nanocrystals (NCs). However, the anion exchange reaction always synthesizes CsPbCl3 NCs with low efficiency and poor stability. Here, first, through separating the halide precursors, mainly metal halide salts as CdCl2 in water, we propose a two-phase anion exchange method, successfully preparing CsPbCl3 NCs with a well-maintained cubic morphology and high photoluminescence quantum yields of about 95%. A controllable Cl-to-Br exchange rate is readily achieved by controlling the reaction time or the Cl− ion concentration. Benefiting from the good solubility of CdCl2 in water, Cl− ions are provided continuously, guaranteeing an adequate Cl-to-Br exchange at a high concentration of the original substrate. Rich Cl− ions, water and even the Cd2+ ions perform effective passivation of the nonradiative recombination centers likely stemming from Cl vacancies or other impurities, which has been confirmed by the transient optical spectroscopy measurements and elemental characterization. Also, the CsPbCl3 NCs reveal improved air stability and excellent photostability. We believe that the two-phase anion exchange method offers a new way to obtain high-efficiency CsPbCl3 NCs through a postsynthetic chemical transformation route, and helps to promote further corresponding applications in optoelectronic devices.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Jing Hong,Tong Wu,Haiyang Wu,Birong Zeng,Shanni Zeng,Ting Chen,Xiu Wang,Zhenwu Lu,Conghui Yuan,Krishnasamy Balaji,Denise F.S. Petri,Lizong Dai
In an attempt to develop an efficient flame retardant for epoxy resin (EP), a hierarchical “dots-core–shell” structure Ag@HNT@PZE was prepared via simple two-step reactions including in-situ growth of Ag within halloysite nanotubes (HNT) and a crosslinking polymerization of polyphosphazene (PZE) coating on Ag@HNT surfaces. Wherein, the dots represented Ag nanoparticles, the core represented HNT , and the shell referred to PZE. Here, Ag encapsulated within HNT acts as an interfacial catalyst to effectively degrade toxicity gas (e.g. CO), while PZE acts as an interfacial compatibilizer for enhancing the dispersion and flame retardant efficiency of Ag@HNT@PZE in the matrix. The flammability and smoke toxicity of EP/Ag@HNT@PZE nanocomposites were both reduced greatly compared to neat EP. The limited oxygen index (LOI), UL-94 grade and char yield of composite EP/5Ag@HNT@PZE reached 33.6 ± 0.72%, V-0 level and 22.8% respectively. Moreover, the peak heat release rate (pHRR) was reduced by 34.2%, accompanied by a higher ratio of graphitized char layer. It showed that flammable pyrolysis products released from EP during combustion were distinctly inhibited because Ag nanoparticles could catalyze the conversion of flammable gas CO to nonflammable CO 2 , which were verified by the density functional theory (DFT) calculations. It was assumed that halloysite-based hybrid flame retardant could have an impact on toxicity-suppressing and catalyze char formation to produce a barrier effect. The combination of metal-immobilized at clay nanotubes interiors for agglomeration-tolerant and PZE-modified at clay nanotubes exterior for shell-protective provides a potential way to develop efficient flame retardant for the manufacture of nanocomposites with higher fire safety.
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高影响因子
APPLIED CATALYSIS A-GENERAL
·
2020
·
IF 5.006
Xiao Chen,Jianyu Li,Yue Wang,Ying Zhou,Qiulian Zhu,Hanfeng Lu
Metal-based monolithic catalysts have excellent electrical and thermal conductivity, impact resistance, ductility, and mechanical properties. Thus, they have a broader application prospect than ceramic-based monolithic catalysts. In this work, high-dispersion Pd nanoparticle dispersion liquid was synthesized by using the solvothermal method. Moreover, nickel-foam-supported Pd/NiO (Pd/NiO/Ni foam) monolithic catalyst with good catalytic combustion performance was prepared successfully by simply spraying the dispersion liquid on the surface of Ni foam, which was oxidized at high temperature to grow NiO film. A novel electric heating catalytic combustion reactor with fast response and safety was constructed by nesting Pd/NiO/Ni foam with an insulated heating rod. Notably, even at the high space velocity of 50,000 h −1 , the constructed reactor can completely degrade 2500 ppm of toluene at 230 ℃ and exhibits good catalytic activity for hydrocarbons and oxygen-containing and heteroatom-containing organic compounds.
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高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2020
·Vol. 22
·期 9
·1-11
·
IF 2.132
Zhao Yubin,Li Meng,Matras-Postolek Katarzyna,Yang Ping
Sn 2+ ions were introduced in Cs-Pb-Br nanocrystals (NCs) to test the change of crystal structure and photoluminescence (PL) property. In the cases of Sn/Pb ratios less than 20%, the CsPb 1- x Sn x Br 3 NCs revealed CsPbBr 3 crystal structure. With increasing the Sn/Pb ratio, Cs-Pb-Sn-Br NCs exhibited a mixture phase of CsPbBr 3 and Cs 4 PbBr 6 . The NCs show bright PLQYs (87%) for Sn/Pb molar ratio of 30%. This is ascribed to little amount Cs 4 PbBr 6 decreased the electrons and holes non-radiation recombination of CsPbBr 3 . With increasing the Sn/Pb ratio to 80%, the Cs 4 Pb 1- x Sn x Br 6 NCs exhibited pure Cs 4 PbBr 6 phase structure. Furthermore, a weak blue-emitting peak around 450 nm was observed for the Cs 4 Pb 1- x Sn x Br 6 NCs. This confirms that Sn 2+ ions were successfully introduced into Cs 4 PbBr 6 structure. The morphologies of samples changed from initial cubic to hexagonal with increasing Sn/Pb ratios from 20 to 80%. The excitons and free carrier dynamics of the NCs were discussed. Graphical abstract
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高影响因子
TRIBOLOGY LETTERS
·
2020
·Vol. 68
·期 4
·1-12
·
IF 2.566
Wu Lili,Lei Xue,Zhang Yujuan,Zhang Shengmao,Yang Guangbin,Zhang Pingyu
Oleylamine (hereinafter referred to as OM)-modified CeO 2 nanoparticles were synthesized by a one-pot pyrolysis method. The tribological properties of the as-prepared CeO 2 nanoparticles as the lubricant additive in poly-alpha olefin (PAO) were investigated with a four-ball machine, and their lubricating mechanism was discussed in relation to worn surface analyses by SEM, EDS, and XPS. Findings indicate that these nanoparticles exhibit good dispersibility as well as excellent anti-wear ability in PAO. This is because OM-modified CeO 2 nanoparticles can catalyze the oxidation of metallic Fe to form ferrite oxide-containing tribo-film. Under the condition of ASTM D2266-2001, the same lowest WDS was obtained at the concentration of 0.2 wt% and 1.8 wt%. When the concentration of CeO 2 is 0.2 wt%, a compact catalytic oxidation tribo-film is formed, which has more outstanding long-term anti-wear ability. When 1.8 wt% CeO 2 is added, the tribo-film formed is the combination of catalytic oxidation film and ceria deposition film, which has more significant bearing capacity.
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