JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2018
·Vol. 29
·期 15
·12824-12829
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IF 2.324
Ruan Chengzhi,Tao Jiahua,Zhu Chengyun,Chen Chen
In this work, potassium-containing Cu 2 SnS 3 thin films (K x Cu 2−x SnS 3 ) were fabricated by a simple and low-cost ultrasonic spray pyrolysis method on glass substrates with different potassium doping concentration. Effects of various potassium concentrations on the structural, morphological and optical properties of the films were systematically investigated. The results indicate that potassium doping can well enhance the growth of particle size and decrease the band gap of the film from to 1.55 to 1.26 eV. Solar cell devices with a structure of glass/FTO/K 2−x Cu 2 SnS 3 /CdS/ZnO/AZO have been prepared and obvious solar cell device performance improvement has been observed by 2 at% potassium doping. This potassium-containing Cu 2 SnS 3 thin films could be a promising absorber material for high efficiency solar cell.
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International Journal of Minerals Metallurgy and Materials
·
2017
·Vol. 24
·期 7
·794-803
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IF 0.943
Huang Shuang,Xu Hua-lan,Zhong Sheng-liang,Wang Lei
Rare-earth stannate (Ln 2 Sn 2 O 7 (Ln = Y, La–Lu)) nanocrystals with an average diameter of 50 nm were prepared through a facile microwave hydrothermal method at 200°C within 60 min. The products were well characterized. The effect of reaction parameters such as temperature, reaction time, pH value, and alkali source on the preparation was investigated. The results revealed that the pH value plays an important role in the formation process of gadolinium stannate (Gd 2 Sn 2 O 7 ) nanoparticles. By contrast, the alkali source had no effect on the phase composition or morphology of the final product. Uniform and sphere-like nanoparticles with an average size of approximately 50 nm were obtained at the pH value of 11.5. A possible formation mechanism was briefly proposed. Gd 2 Sn 2 O 7 :Eu 3+ nanoparticles displayed strong orange-red emission. Magnetic measurements revealed that Gd 2 Sn 2 O 7 nanoparticles were paramagnetic. The other rare-earth stannate Ln 2 Sn 2 O 7 (Ln = Y, La–Lu) nanocrystals were prepared by similar approaches.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2022
·Vol. 33
·期 33
·25436-25445
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IF 2.779
Li Saisai,Li Xingjia,Zhang Xiuli,Lv Zhaoyue,Liang Zhu,Xu Haisheng
The multilayer electrocaloric ceramics (MLEC) are promising candidates for environmentally friendly refrigeration, since it possesses large electrocaloric effect (ECE) at a relatively low applied voltage. In this work, factors that may influence the ECE of MLEC are investigated. Experimental results demonstrate that the ECE of MLEC is strongly related to its effective volume fraction, and the effective volume fraction of the MLEC can be tailored by changing the thickness of the MLEC protective layer. Measurements show up to a 33.3% improvement of adiabatic temperature change when the thickness of MLEC protective layers is decreased by 70.0%. Meanwhile, the relaxation and the temperature range of the MLEC is increased with the increase of frequency. The enhanced ECE response is obtained over a broad temperature range from 0 °C to 50 °C in MLEC. It is found that the ECE response of MLEC could be enhanced by thinning the protective layer, and this enhancement is induced by the increasing of the effective volume fraction which is caused by the protective layer thinning. As a result, this work provides an effective and feasible way to develop high-performance MLEC components.
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Science China-Materials
·
2020
·Vol. 64
·期 3
·592-600
·
IF 6.098
Wang Wei,Borse Rahul Anil,Xie Jiafang,Wang Yaobing
The preparation of high-value fuels and chemicals through the electrochemical carbon dioxide reduction reaction (CDRR) is of great significance to the virtuous cycle of carbon dioxide. However, due to the high overpotential involved in this reaction, high power consumption and high-cost noble-metal-based catalysts are required for driving this process. Herein, the electrochemical CDRR was achieved on biocompatible metal-free nitrogen, phosphorus co-doped carbon-based materials (NP-C) in the microbial fuel cell-microbial electrolysis cell (MFC-MEC) coupling system. As the bioelectrochemistry in MFC supplied power to drive the electrocatalysis in MEC, syngas was spontaneously produced from this coupling system without external energy input. With the NP-C materials as the excellent bifunctional electrocatalyst for the CDRR and oxygen reduction reaction (ORR), the current density of the MEC reached −0.52 mA cm −2 , and the Faradaic efficiencies (FEs) of CO and H 2 were 60% and 40%, respectively, at a load resistance of 10 Ω. Moreover, the CO/H 2 product ratio can be changed by adjusting the load resistance, which will widely meet various demand of syngas usage in further reactions. This study provides a spontaneous and tunable production of syngas in biogas digesters via a electrochemical strategy.
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Food Biophysics
·
2026
·Vol. 21
·期 4
·141
·
IF 3.9
Chi Guoxiang,Tang Laiyun,Liu Huipeng
Pectin-derived polygalacturonic acid exhibits valuable bioactivities yet suffers from poor solubility that limits its application in the food and pharmaceutical industries; the controllable preparation of uniform oligogalacturonides (OGAs) remains a key technical bottleneck. This work aimed to establish an eco-friendly depolymerization route for polygalacturonic acid and clarify the structural features and combined hypoglycemic-antioxidant bioactivities of the resulting OGAs. Hydrogen peroxide was used as a green degradation reagent to break polygalacturonic acid chains, and target OGAs were recovered via ethanol precipitation. Multiple characterization techniques including FT-IR, NMR, HPAEC and UPLC-MS/MS were adopted to analyze the chemical structures of OGAs, while in vitro radical scavenging and α-glucosidase inhibition assays combined with molecular simulation were conducted to assess biofunctions and binding mechanisms. Structural identification confirmed that OGAs contained esterified and non-esterified galacturonic acid backbones with minor neutral sugar branches, with degrees of polymerization distributed from 3 to 11. OGAs exerted obvious concentration-dependent antioxidant capacity, achieving 78.68% DPPH and 73.98% ABTS radical clearance at 18 mg/mL, and reached 57.14% α-glucosidase inhibition at 1.5 mg/mL. Molecular simulation proved that longer OGAs form stronger hydrogen bond interactions with enzyme active pockets, with binding energy decreasing from -9.8 kcal/mol (GalA 3 ) to -16.0 kcal/mol (GalA 8 ). This green H 2 O 2 degradation method enables efficient preparation of structurally defined OGAs, and the dual antioxidant and hypoglycemic properties of OGAs support their promising potential for exploitation in functional foods and antidiabetic agents.
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Science China-Materials
·
2018
·Vol. 61
·期 5
·697-706
·
IF 4.318
Zhang Yuan,Zhang Jinfeng,Chen Zelin,Liu Yunwei,Zhang Mengmeng,Han Xiaopeng,Zhong Cheng,Hu Wenbin,Deng Yida
This paper demonstrates a one-pot approach to produce highly dispersed dendritic palladium-platinum bimetallic nanoparticles (NPs) with small particle size, tunable composition and high catalytic activity. Herein, the PdPt bimetallic NPs have been obtained using bayberry tannin (BT) as both the reducing agent and surfactant. Additionally, the PdPt bimetallic NPs with different Pd/Pt atomic ratios can be prepared by just varying the amounts of the Pd and Pt precursors. Most importantly, the as-prepared Pd 52 Pt 48 catalyst exhibits the optimal catalytic activities compared with the other compositional PdPt NPs (Pd 82 Pt 18 , Pd 69 Pt 31 , and Pd 36 Pt 64 ) and commercial Pt/C (20 wt.%) catalyst for the methanol oxidation reaction (MOR). Meanwhile, Pd 52 Pt 48 also shows better CO tolerance, which can be attributed to the unique dendritic structure and the synergistic effect between Pd and Pt. With evident advantages of the facile preparation and enhanced catalytic performance, it holds great promise as a high-performance catalyst for electrochemical energy conversion.
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Nano Research
·
2021
·Vol. 14
·期 7
·2241-2246
·
IF 8.897
Yang Mingming,Wang Longlong,Hu Guofeng,Chen Xue,Gong Peng Lai,Cong Xin,Liu Yi,Yang Yuanbo,Li Xiaoli,Zhao Xiaohui,Liu Xuelu
The interlayer coupling in van der Waals (vdW) heterostructures (vdWHs) is at the frontier of the fundamental research, underlying many optical behaviors. The graphene/MoS 2 vdWHs provide an ideal platform to reveal the good interfacial coupling between graphene and MoS 2 constituents. Here, three groups of graphene/MoS 2 vdWHs were prepared by transferring 1–3 layers of graphene onto monolayer MoS 2 . The interlayer coupling within graphene/MoS 2 vdWHs were characterized and analyzed by Raman spectroscopy, photoluminescence (PL) spectroscopy and optical contrast (OC) spectroscopy. The upshift of the A 1g peak of MoS 2 and the upshift of the D and 2D peaks of SLG show that the electrons move from MoS 2 to graphene accompanied by the dielectric shielding effect on graphene. The weakened PL intensities and the slight red shift of A peak prove that the electrons move from MoS 2 to graphene meanwhile the recombination of hole and electron pairs is blocked in vdWHs. Our results deepen the understanding of the interlayer coupling of graphene/MoS 2 vdWHs and therefore provide guidelines for the practical design and application of optoelectronic devices based on graphene/MoS 2 vdWHs.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2016
·Vol. 28
·期 6
·4669-4675
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IF 1.798
Zhang Xiufang,Mei Jie,Wang Song,Zheng Yingying,Cui Can,Pan Jiaqi,Li Chaorong
The cotton cellulose nanofibers(CCNFs)/ZnO/CuS nanocomposites have been successfully fabricated by the electrospun-hydrothermal method and successive ionic layer adsorption. The results of XRD, SEM and TEM indicate that the CuS are successfully combined with the ZnO. The photocatalytic activity of the CCNFs/ZnO/CuS nanocomposites is investigated by the degradation of methylene blue under visible light irradiation, and it is demonstrated to be significantly enhanced after the CuS is introduced. Furthermore, the direct interfacial charge transfer of the ZnO/CuS is considered as the main reason for the enhancement.
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Scientific Reports
·
2024
·Vol. 14
·期 1
·7334
·
IF 3.8
Jiang Biao,Xu Shuai,Lu Yingfa,Yu Yingsong
Wetting and evaporation behavior of dilute sodium dodecyl sulfate (SDS) droplets on planar polydimethylsiloxane (PDMS) surfaces under a direct current (DC) electric field were experimentally investigated. Two characteristic voltages—actuation voltage and saturation voltage were observed in the electrowetting of dilute SDS droplets on PDMS surfaces. It was found that for dilute SDS droplets with a fixed SDS concentration substrate elasticity has an obvious influence on actuation voltage, and saturation voltage increased with the increase of mass ratio of PDMS surfaces. SDS concentration was also found to obviously influence actuation voltage and saturation voltage when SDS concentration was in a certain range. For the case of evaporation of sessile dilute SDS droplets on PDMS surfaces with the application of a DC electric field, substrate elasticity, SDS concentration and the magnitude of applied voltage were all found to have an influence on the duration of CCR stage. Moreover, contact angle hysteresis for dilute SDS droplets on a planar PDMS 10:1 surface under different applied voltage was measured and it was found that the magnitude of applied voltage greatly influenced contact angle hysteresis, which also depends on SDS concentration and KCl concentration.
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JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
·
2024
·Vol. 34
·期 12
·10999-11008
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IF 2.2
Feng Lijuan,Yuan Xiang,Wang Qingping,Li Weiwei,Hao Li,Su Ling,Jiang Guiquan
Energy transfer (ET)-based ZnGa 2 O 4 :Mn 2+ , Cr 3+ phosphors with the capacity for ratiometric light conversion have been designed. The Mn 2+ and Cr 3+ ions in the ZnGa 2 O 4 :Mn 2+ , Cr 3+ act as ET donors and receptors, respectively, by changing the doping amount of energy receptor Cr 3+ ions, phosphor materials show different emission colors (green to deep red). The relationship between red and green phosphorescence is ratiometric and linear and, when 254 nm excitation is stopped, the phosphor shows a dark green afterglow. This ET-based ratiometric green-to-red light conversion provides a facile, sensitive and selective method for dynamic anti-counterfeiting.
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International Journal of Minerals Metallurgy and Materials
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2022
·Vol. 29
·期 3
·503-512
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IF 3.85
Liu Lihua,Li Ning,Han Jingrui,Yao Kaili,Liang Hongyan
Transition metal phosphides (TMPs) have exhibited decent performance in an oxygen evolution reaction (OER), which is a kinetic bottleneck in many energy storages and conversion systems. Most reported catalysts are composed of three or fewer metallic components. The inherent complexity of multicomponent TMPs with more than four metallic components hinders their investigation in rationally designing the structure and, more importantly, comprehending the component-activity correlation. Through hydrothermal growth and subsequent phosphorization, we reported a facile strategy for combining TMPs with tunable elemental compositions (Ni, Fe, Mn, Co, Cu) on a two-dimensional titanium carbide (MXene) flake. The obtained TMPs/MXene hybrid nanostructures demonstrate homogeneously distributed elements. They exhibit high electrical conductivity and strong interfacial interaction, resulting in an accelerated reaction kinetics and long-term stability. The results of different component catalysts’ OER performance show that NiFeMnCoP/MXene is the most active catalyst, with a low overpotential of 240 mV at 10 mA·cm −2 , a small Tafel slope of 41.43 mV·dec −1 , and a robust long-term electrochemical stability. According to the electrocatalytic mechanism investigation, the enhanced NiFeMnCoP/MXene OER performance is due to the strong synergistic effect of the multi-elemental composition. Our work, therefore, provides a scalable synthesis route for multi-elemental TMPs and a valuable guideline for efficient MXene-supported catalysts design.
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International Journal of Diabetes in Developing Countries
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2026
·
IF 0.8
Xu Mingxing,Wang Jing,Ge Xueqing,Wang Xu,Wang Huanqin,Sun Xinyi,Yang Junhong,Wang Shu
Background Diabetes is a chronic metabolic disease whose prevalence and progression are closely related to many factors, including genetics, environment, and lifestyle. Impaired fasting glucose (IFG) is an early manifestation of type 2 diabetes mellitus (T2DM), but the underlying mechanisms are not yet fully understood. In this study, we explored the differentially expressed metabolites in patients with IFG and T2DM by using an untargeted metabolomics approach. Objective In this study, we explored the differentially expressed metabolites in patients with impaired fasting glucose (IFG) and type 2 diabetes mellitus (T2DM) by using an untargeted metabolomics approach. Methods Patients were assigned to three groups as follows: an IFG group, T2DM group, and normal control group. After matching baseline data that comprised sex, age, aminopherase, creatinine, and uric acid, we selected 16 cases in each group. Fasting serum metabolomes were profiled using ultra-high performance liquid chromatography-mass spectrometry (UHPLC-MS). Results The study population consisted of a cohort of 48 patients: 16 patients in the normal control group, 16 in the IFG group, and 16 in the T2DM group. Untargeted metabolomic analysis demonstrated 25 differentially expressed metabolites in the IFG group and 51 differentially expressed metabolites in the T2DM group. In the IFG group, differentially expressed metabolites were mainly enriched in glycerophospholipid metabolism, ether lipid metabolism, amino acid metabolism and biosynthesis, and pyruvate metabolism. In the T2DM group, the enriched pathways included glycerophospholipid metabolism, pyruvate metabolism, multiple amino acid-related pathways (glycine, serine, threonine, alanine, aspartate, glutamate, phenylalanine), phenylalanine-tyrosine-tryptophan biosynthesis, the citrate cycle, and butanoate metabolism. Conclusions This pilot metabolomic investigation suggests that changes in metabolic characteristics may already occurred early in the development of T2DM. There may still exist some metabolic differences between patients with IFG and those with T2DM, and differentially expressed metabolites were concentrated in the amino acid and lipid metabolism pathways. But this study is still in the exploratory stage; future work with larger, longitudinal cohorts is warranted to validate these findings and assess their clinical relevance.
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