CARBON
·
2018
·
IF 7.082
Cheng-Long Shen,Jin-Hao Zang,Qing Lou,Li-Xia Su,Zhen Li,Zhi-Yu Liu,Lin Dong,Chong-Xin Shan
It is still a challenging issue to achieve efficient and tunable fluorescent carbon dot (CD) powders. Herein, we report a novel and general solvothermal strategy to in-situ embedding CDs in trisodium citrate crystal matrix, and these CDs exhibit tunable emission from green to yellow and a high quantum yield up to 21.6% in solid state, comparable to that in solution. This intriguing fluorescence phenomenon may be caused by the space confinement from trisodium citrate crystal matrix, thus enabling CDs to effectively suppress the aggregation-induced luminescence quenching. The CD powders have been employed for fabricating white light-emitting devices on blue chips with adjustable color temperature. Moreover, solid-state lighting systems like flexible fluorescent films and plates have been demonstrated by using the CD powders as the luminescent medium. This work provides a facile way to achieve tunable solid-state fluorescence CD powders, which have promising applications in CDs-based luminescence devices.
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Nanoscale
·
2019
·Vol. 11
·期 40
·18874-18880
·
IF 6.97
Guanying Chen,Mingjuan Sun,Juan Li,Mingshan Zhu,Zaizhu Lou,Baojun Li
Anisotropic plasmonic metals have attracted significant attention in enhancing the catalytic performance of catalysts due to their broad light-harnessing capabilities and active hot electrons; however, limited investigations have been dedicated towards improving their electrochemical reaction performance in the visible and near infrared (NIR) regions. Herein, anisotropic Pt-edged Au nanodisks (NDs) were synthesized by controlling the preferential loading of Pt and used as catalysts for plasmon-enhanced electrochemical methanol oxidation reactions (MORs) under visible-NIR light irradiation by, and the light-enhanced electric current over the Pt-edged Au NDs was found to be 3-fold higher than that under dark conditions. Wavelength-dependent electric current over the Pt-edged Au NDs for the MOR in the visible-NIR light region demonstrates that the light-induced enhancement of the electric current is due to surface plasmon resonance (SPR) of the Au NDs. Furthermore, plasmonic hot electron transfer was studied by the single-particle photoluminescence images and spectra of Au NDs and Pt–Au NDs, and the dipole surface plasmon resonance (DSPR) mode was proved to be the main channel for hot electron transfer. During the electrochemical reaction under visible-NIR light irradiation, a plasmonic hot electron is transferred to the electrode, and a “hot hole” is left on the surface, boosting the MOR.
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Nature Communications
·
2017
·Vol. 8
·期 1
·1-12
·
IF 12.124
Su Jianwei,Yang Yang,Xia Guoliang,Chen Jitang,Jiang Peng,Chen Qianwang
The scalable production of hydrogen could conveniently be realized by alkaline water electrolysis. Currently, the major challenge confronting hydrogen evolution reaction (HER) is lacking inexpensive alternatives to platinum-based electrocatalysts. Here we report a high-efficient and stable electrocatalyst composed of ruthenium and cobalt bimetallic nanoalloy encapsulated in nitrogen-doped graphene layers. The catalysts display remarkable performance with low overpotentials of only 28 and 218 mV at 10 and 100 mA cm −2 , respectively, and excellent stability of 10,000 cycles. Ruthenium is the cheapest platinum-group metal and its amount in the catalyst is only 3.58 wt.%, showing the catalyst high activity at a very competitive price. Density functional theory calculations reveal that the introduction of ruthenium atoms into cobalt core can improve the efficiency of electron transfer from alloy core to graphene shell, beneficial for enhancing carbon–hydrogen bond, thereby lowing ΔG H* of HER.
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高影响因子
Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 46
·17512-17520
·
IF 8.067
Jizhong Liu,Hui Fu,Zhentao Du,Deliu Ou,Shixian Li,Qiaochu Chen,Weiyou Yang,Jialong Zhao,Jinju Zheng
The photothermal stability against light irradiation and high temperature of organic–inorganic hybrid perovskite nanocrystals (PNCs) is critically important for their applications in photoelectronic nanodevices. In the present work, we report the significantly enhanced photothermal stability of FAPbBr3 PNCs, which are fabricated by in situ growth of PNCs in polyvinylidene fluoride films (FAPbBr3@PVDF) with incorporation of Cd2+ ions. It is found that the introduced Cd2+ ions could effectively passivate the PNC defects and shorten the length of Pb–Br bonds, giving rise to the intensified interaction between Pb2+ and Br− in the [PbBr6]4− octahedron, which thereby suppresses the halogen ion migration under light irradiation and high temperature with enhanced photothermal stability. As a result, the Cd2+-doped FAPbBr3@PVDF film exhibits durable photothermal stability with 96% and 97% photoluminescence quantum yield (PLQY) retentions, under continuous blue-light irradiation (460 nm, 13 mW cm−2) for over 360 h, and under both a high temperature of 333 K and blue-light irradiation over 48 h, respectively. Furthermore, the as-constructed white light-emitting-diodes (WLEDs) deliver a wide color gamut (117% of NTSC standard) with chromaticity coordinates of (0.331, 0.337), verifying their promising applications in backlight sources.
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Scientific Reports
·
2017
·Vol. 7
·期 1
·1-9
·
IF 4.259
Ke Shanming,Li Tao,Ye Mao,Lin Peng,Yuan Wenxiang,Zeng Xierong,Chen Lang,Huang Haitao
(In + Nb) co-doped TiO 2 (TINO) rutile is an emerging material with a colossal dielectric permittivity (CP) and a low dielectric loss over wide temperature and frequency ranges. The electrical inhomogeneous nature of TINO ceramics is demonstrated by direct local current probing with high-resolution conductive atomic force microscopy (cAFM). The CP response in TINO is found to originate from the electron-pinned defect dipole induced conductive cluster effect and the electrode effect. Two types of dielectric relaxations are simultaneously observed due to these two effects. With the given synthesis condition, we found TINO shows a highly leaky feature that impairs its application as a dielectric material. However, the fast-temperature-rising phenomenon found in this work may open a new door for TINO to be applied as a potential electrothermal material with high efficiency, oxidation-proof, high temperature stability, and energy saving.
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JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Shunli Wan,Yan Li,Shuo Cheng,Guowei Wu,Xuan Yang,Yu Wang,Liangmin Gao
Metallic oxide nanoparticles (NPs) anchored in biochar provide a promising measure forward into the scaled-up application of these NPs in water treatment , and reducing the size of the dwelled NPs is expected to boost the adsorption performance of biochar-based composites because of the size and surface effect. Nevertheless, it is still of great challenge to regulate the size of the impregnated NPs due to their intrinsic self-agglomeration caused by high surface energy . In this study, we fabricated the charged biochar (C-BC) bearing high-density negatively charged groups (i.e., carboxyl and hydroxyl groups) via HNO 3 oxidization to load the model metal oxide FeOOH NPs. The average sizes of anchored FeOOH NPs were ultrasmall, ranging from 19.9 ± 1.5 to 3.1 ± 0.5 nm, and decreased with the increased amount of carboxyl and hydroxyl groups in C-BC. Whether in batch adsorption or fixed-bed column setting, adsorption of Cd(II) onto the as-made composites was greatly enhanced by carboxyl and hydroxyl groups in carrier. The normalized adsorption capacities of Cd(II) by ferric mass of the loaded FeOOH were 499.9–724.9 mg/g-Fe, approximately 18.6–27.1 and 2.51–3.64 folds over the bulky FeOOH and FeOOH-impregnated biochar. Our study results should provide a significant reference on how to acquire highly efficient biochar-based composites for water decontamination .
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ACS Applied Nano Materials
·
2023
·
IF 5.9
Yadong Li,Yaxuan Wang,Chen Yang,Lijuan Cao,Lirong Zheng,Lin Gu,Qinghua Zhang,Xilong Wang,Han-Pu Liang
Coupling the structure advantages of platinum (Pt)-based active composites, transition-metal single sites, and porous carbon is highly desirable to reduce the Pt usage in proton-exchange membrane fuel cells (PEMFCs) but remains a great challenge. Herein, we report the in situ construction of synergistic oxygen reduction reaction (ORR) catalysts with intermetallic PtZn alloy nanoparticles confined in mesoporous carbon doped with atomic Co–N4 and Zn–N4 moieties. Mesoporous carbon doped with Co–N4 and Zn–N4 moieties could be fabricated by carbonization of CoSO4-doped ZIF-8 precursors and SO42– has been verified to be responsible for the formation of mesopores and defects with narrow pore size distribution. More importantly, systematical characterizations revealed that Pt could in situ alloy with Zn–N4 sites, which could effectively prevent the agglomeration of Pt during high-temperature treatment, leading to the formation of uniform and well-dispersed PtZn nanoparticles with a mean diameter of ∼3.06 nm. The as-synthesized PtZn@Meso/Zn1Co1/NC shows an excellent mass activity of 490 mA mgPt–1 @ 0.9 V as well as excellent durability with an activity retention of 79% after 20,000 potential cycles in 0.1 M HClO4, showing that the nanoarchitecture of the mesopore-encased PtZn alloy has a high resistance to migration due to the pore confinement effect and anchoring effect of the support. In addition to developing robust Pt-based catalysts, this study also lays out a straightforward strategy for designing synergistic catalysts, which might have far-reaching implications for fuel cells and beyond.
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Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 23
·14244-14252
·
IF 10.733
Zeyi Wang,Xuelian Zhang,Zhuanghe Ren,Yong Liu,Jianjiang Hu,Haiwen Li,Mingxia Gao,Hongge Pan,Yongfeng Liu
A novel 2D layered NbTiC solid-solution MXene was synthesized from its MAX phase via a wet chemical etching process. While ball milling the NbTiC MXene with MgH2, ultrafine bimetal NbTi nanocrystals were formed in situ with a grain size of 5 nm, which offer highly stable catalytic activity for the hydrogen storage reaction of MgH2. The MgH2-9 wt% NbTiC sample starts releasing hydrogen from 195 °C, which is 80 °C lower than that for the additive-free sample. At 250 °C, it releases approximately 5.8 wt% H2 within 30 min, and the fully dehydrogenated sample takes up 4.0 wt% H2 within 15 min even at 50 °C under 50 bar H2 pressure. DFT calculations reveal a charge transfer process from Ti atoms to Nb atoms in the NbTi cluster and a lower absolute value of the adsorption energy of H2 on NbTi. This would presumably benefit both the breakage of Mg–H bonding and the detachment of H2 from the NbTi surface, and consequently lead to good catalytic activity.
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IET Nanobiotechnology
·
2015
·Vol. 9
·期 1
·35-42
·
IF 1.5
Qiumei Liao,Ying Yu,Yujuan Cao,Bixia Lin,Jingjing Wei
The fluorescence labelling of plant hormone binding sites is an important analytical technique in research on the molecular mechanisms of plant hormone activities. The authors synthesised a jasmonic acid (JA)-conjugated ZnS:Mn quantum dot (QD) probe, with a cubic structure and average hydrodynamic sizes of about 17.0 nm. The maximum fluorescence emission of the probe was recorded at about 585 nm. The probe was used for fluorescence labelling of JA binding sites in mung bean seedling tissues. Analysis revealed that the probe exhibited high selectivity to JA binding sites and good performance in eliminating interference from background fluorescence in plant tissues. In addition, the probe did not exhibit any apparent biotoxicity, and is much more suitable than probes constructed from CdTe QDs for the analysis of biological samples.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2010
·
IF 1.566
Hongqi Chen,Cailing Zhou,Lun Wang,Jingguo Chen,Bo Ling,Jie Fu
The sensitized fluorescence intensity of the terbium (III) ion can be notably enhanced in the presence of sodium hexametaphosphate (SHMP). Based on this, water-soluble Tb-SHMP chelate complexes were synthesized in aqueous solutions, and characterized by spectrofluorometry. 6-Mercapto-5-triazole[4,3-b]-S-tetrazine was generated by the quantitative reaction of HCHO with 4-amino-3-hydrazino-5-mercapto-1,2,4-triazole under alkaline conditions at room temperature . The spectral overlap between the emission of Tb-SHMP chelate complexes and absorption of 6-mercapto-5-triazole[4,3-b]-S-tetrazine meets the prerequisite for fluorescence energy transfer . Based on this, a novel efficient fluorescence energy transfer system between Tb-SHMP chelate complexes as donor and 6-mercapto-5-triazole[4,3-b]-S-tetrazine as acceptor was developed for the determination of HCHO in aqueous solutions. Under the optimal experimental conditions, this method is capable of detecting HCHO concentrations from 2.06 × 10 −5 to 6.18 × 10 −3 mg mL −1 and the limit of detection was 7.11 × 10 −6 mg mL −1 . Compared with other general methods for the determination of HCHO, the proposed method improved the sensitivity and selectivity. Moreover, the proposed method was successfully applied to the determination of HCHO in water samples.
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SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2017
·
IF 4.784
Jun-wei Wang,Cui-zhen Zhang,Zhuo-hua Li,Hong-xia Zhou,Jia-xin He,Jing-chao Yu
As a solar energy storage medium at moderate-to-high temperature, molten chlorate severally corrodes metal vessels. The corrosion behavior and mechanisms of pure nickel (Ni), GH4033 and GH4169 in 793 K molten eutectic NaCl-MgCl 2 were studied. During the initial stage of corrosion, pure Ni and GH4033 gain weight from the many plate-like shells formed on the sample surface. After corrosion for 40 h, all sample surfaces were rather porous and loosened. MgO nuclei that were attached to the loosened microstructure surface fell off with the microstructures, which led to a continual decrease in the sample weight. The three sample surfaces were mainly composed of MgO and Ni or (Ni, Fe) from the sample substrate. Al and Ti were preferentially oxidized and stably excited on the GH4033 surface, which inhibits the corrosion process. The corrosion rate of GH4169 was the highest for the δ phase, which is rich in Nb, and phase boundaries were corroded preferentially. In the anode reaction, metal atoms escape from the corrosion system in the form of chlorides or aqueous chlorides.
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CURRENT PHARMACEUTICAL BIOTECHNOLOGY
·
2024
·Vol. 25
·期 4
·477-487
·
IF 2.2
Chen Jianmin,Yu Sijin,He Zemin,Zhu Danhong,Cai Xiaozhen,Ruan Zhipeng,Jin Nan
Background: Cinnamic acid and its derivatives have gained significant attention in recent medicinal research due to their broad spectrum of pharmacological properties. However, the effects of these compounds on xanthine oxidase (XO) have not been systematically investigated, and the
inhibitory mechanism remains unclear. Objectives: The objective of this study was to screen 18 compounds and identify the XO inhibitor with the strongest inhibitory effect. Furthermore, we aimed to study the inhibitory mechanism of the identified compound. Methods: The effects of
the inhibitors on XO were evaluated using kinetic analysis, docking simulations, and in vivo study. Among the compounds tested, 4-NA was discovered as the first XO inhibitor and exhibited the most potent inhibitory effects, with an IC50 value of 23.02 ± 0.12 μmol/L.
The presence of the nitro group in 4-NA was found to be essential for enhancing XO inhibition. The kinetic study revealed that 4-NA inhibited XO in a reversible and noncompetitive manner. Moreover, fluorescence spectra analysis demonstrated that 4-NA could spontaneously form complexes with
XO, referred to as 4-NA–XO complexes, with the negative values of ΔH and ΔS. Results: This suggests that hydrogen bonds and van der Waals forces play crucial roles in the binding process. Molecular docking studies further supported the kinetic analysis and provided insight
into the optimal binding conformation, indicating that 4-NA is located at the bottom outside the catalytic center through the formation of three hydrogen bonds. Furthermore, animal studies confirmed that the inhibitory effects of 4-NA on XO resulted in a significant reduction of serum uric
acid level in hyperuricemia mice. Conclusion: This work elucidates the mechanism of 4-NA inhibiting XO, paving the way for the development of new XO inhibitors.
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