JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Lin Yue,Yunmeng Cao,Yonghui Han,Zaixing Li,Xiao Luo,Yanfang Liu
The magnetic metal-organic framework composite Fe 3 O 4 @Sn-MOF with core-shell structure was successfully prepared by hydrothermal synthesis. It was characterized by XRD , TEM , BET, DRS , FT-IR, XPS and VSM. The photocatalytic performance of the composite was evaluated by degradation of Acid Red 3R (AR3R) dye under simulated light source. Under the conditions that the additive amount of the catalyst was 6.7 g/L, the initial concentration of AR3R was 50 mg/L and the initial pH of AR3R was 3.0, Fe 3 O 4 @Sn-MOF revealed the optimized photocatalytic activity with 100% degradation efficiency of AR3R at 30 min. The excellent photocatalytic ability was mainly ascribed to the effective charge separation, strong photo-response and rich active sites. Besides, using Fe 3 O 4 as the magnetic nucleus was conducive to improve the recovery rate of the catalyst. The EPR and free radical analysis indicate that •O 2 − and •OH played important roles in the photocatalytic reaction. Meanwhile, a possible degradation process and mechanism were proposed by the full band scanning of AR3R, 3D-EEM fluorescence analysis and electrochemical measurement.
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JOURNAL OF DRUG DELIVERY SCIENCE AND TECHNOLOGY
·
2021
·
IF 3.981
Xiuting He,Zhongcheng Cao,Nuannuan Li,Liuxiang Chu,Jiazhen Wang,Chunyan Zhang,Xiaoyan He,Xiaoyan Lu,Kaoxiang Sun,Qingguo Meng
7-Ethyl-10-hydroxycamptothecin (SN-38)-loaded polyethylene glycol-GPLGVRG-poly β-benzyl- l -aspartic acid (PEG-GPLGVRG-PBLA) self-assemblies were successfully prepared using a classical nanoprecipitation method to give an enzyme-responsive nano-drug delivery system. The PEG-GPLGVRG-PBLA/SN-38 self-assemblies were characterized by transmission electron microscopy , dynamic light scattering , and high-performance liquid chromatography. The encapsulation efficiency was 91.7 ± 1.21% and the drug loading was 16.6 ± 0.93%. The 12 h in vitro release of SN-38 from PEG-GPLGVRG-PBLA/SN-38 treated with MMP-2 was 73.2 ± 2.05%, which was significantly higher than that for the group without MMP-2, demonstrating the enzyme-responsiveness of the nano-drug delivery system. In addition, the cellular uptake and tumor accumulation of PEG-GPLGVRG-PBLA were better than those of PEG-PBLA, and the blank PEG-GPLGVRG-PBLA showed high biocompatibility . These findings indicate that the enzyme-responsive nano SN-38 delivery system could provide new opportunities in tumor therapy.
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RSC Advances
·
2021
·Vol. 11
·期 6
·3380-3389
·
IF 3.361
Mukerem Helil Abib,Junchun Li,Heming Yang,Man Wang,Taotao Chen,EnzeXu,Yang Jiang
All inorganic carbon-based planar perovskites, particularly CsPbBr3, have attracted considerable attention due to their excellent stability against oxygen, moisture, and heat for photovoltaic utilization. However, the power conversion efficiency of carbon-based planar CsPbBr3 perovskite solar cells is mostly low, primarily because of the inferior film quality with undesirable crystallization and narrow light absorbance ranges. Herein, we develop a novel direct deposition approach combined with Sn doping to achieve highly efficient and stable carbon-based Sn-doped CsPbBr3 perovskite solar cells. Mass-scale Sn ion-doped CsPbBr3 perovskite powder was effectively synthesized and characterized via a facile strategy by adding hydrohalic acid in the CsBr, PbBr2 and SnBr2 precursor in a dimethyl sulfoxide solution. Moreover, using the as-synthesized CsPbBr3 and Sn-doped CsPbBr3 perovskite powder, PSCs were obtained via effective direct thermal evaporation. A smooth, constant and pinhole-free perovskite film was achieved with a configuration of FTO/TiO2/Sn:CsPbBr3/carbon. PSCs based on Sn:CsPbBr3 as an absorber and carbon as the HTM achieved an impressive power conversion efficiency of 8.95% compared to 6.87% for undoped CsPbBr3; moreover, it displayed admirable stability in an open-air atmosphere for an operational period of about 720 h without a noticeable negative result. The introduction of the Sn ion may advance the interface extraction of charge between the electric transport layer to the absorber layer and absorber to the carbon electrode. Accordingly, the Sn ion doping on CsPbBr3 during the synthesis phase and the direct evaporation paves a novel approach for intended photovoltaic applications.
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ACS Omega
·
2020
·
IF 2.87
Zheng Shen,Yishan Gao,Ling Kong,Minyan Gu,Meng Xia,Wenjie Dong,Wei Zhang,Xuefei Zhou,Yalei Zhang
Amine-modified Sn-β was synthesized to improve the yield of lactic acid produced from Scenedesmus. After studying the growth of Scenedesmus, we selected Scenedesmus with the highest sugar content of 46.7% after 8 days of culture as the reaction substrate. The results showed that the yield of lactic acid from Scenedesmus was greatly increased after being catalyzed by 3-aminopropyltrimethoxysilane (APTMS)-modified Sn-β. After the pretreatment of Scenedesmus in an ice bath ultrasound, under the optimal reaction conditions (190 °C and 5 h), the yield of lactic acid reached the highest (37%). The acid–base characterization results of the catalyst confirmed that there are both Lewis acidic sites and medium-strength basic sites in the catalyst. Both of these sites can promote the hydrolysis of Scenedesmus, while the Lewis acidic sites can promote the production of lactic acid and the basic sites can effectively inhibit the production of the byproduct 5-hydroxymethylfurfural (HMF). This study proved that this amination catalyst is a useful strategy to increase the yield of lactic acid.
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JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
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2020
·Vol. 35
·期 2
·272-279
·
IF 0.64
Li Zhi,Shen Wenjian,Zhao Juan,Ying Hangkai,Wu Zhengli,Liu Yifan,Li Wangnan,Ku Zhiliang,Peng Yong,Huang Fuzhi,Cheng Yibing,Zhong Jie,Fu Zhengyi
A novel aqueous Sn-S complex solution was applied as precursor to fabricate SnO 2 electron selective layers (ESLs) for the hybrid perovskite solar cells (PSCs). The tin and sulfur powder were directly dissolved in a (NH 4 ) 2 S water solution to form Sn-S precursor. After depositon and annealing, the SnO 2 film was formed, presenting as a low cost and enviromental friendly method for preparation of ESL. The films showed excellent transmittance at visible wavelength range. Moreover, the method exhibited high compatibility for doping using Cu, Cd, Li, and Zn elements. Zn doping (0.05 M) in the as-prepared SnO 2 ESL significantly improved perovskite solar cells (PSCs) performance. The highest PCE of 13.17% was achived with 15% enhancement compared to that of undoped SnO 2 ESL samples. TiCl 4 modifications on SnO 2 film improved photovoltaic performance to 14.45%, but resulted in the poor long-term stability, around 80% more degredation than that of PSCs based on Zn-doped SnO 2 films.
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ACS Sustainable Chemistry & Engineering
·
2019
·
IF 6.97
Sachin Mane,Yu-Xia Li,Xiao-Qin Liu,Lin-Bing Sun
The use of porous carbons for selective CO2 separation attracts increasing attention. Owing to low thermostability of porous polymers, low yield is the major concern of porous carbons. To obtain porous carbons with high yield, the development of thermostable porous polymers is highly expected. Herein, high yielded (70% for 700 °C and 64% for 800 °C) Sn-doped porous carbons (SnPCs) have been constructed through KOH-assisted carbonization of Sn-containing polymer. Notably, SnPC-700 (218.5 mg·g–1) demonstrates higher CO2 adsorption capacity than the reference sample prepared without KOH, SnPC-700r (188.3 mg·g–1), indicating the importance of KOH-assisted activation. Carbonization temperature has an effect on the adsorption capacity of resultant materials, and high carbonization temperature leads to better adsorption capacity on CO2. SnPC-800 is able to capture 242.8 mg·g–1 of CO2, which is better than some benchmarks including BILP-7 (193.0 mg·g–1), PAF-1–450 (196.4 mg·g–1), and FCTF-1 (205.5 mg·g–1). More importantly, SnPC-800 demonstrates good selectivity of CO2 over CH4 (31.1). Thus, high yield and good performance upon CO2 adsorption capacity and selectivity over CH4 make SnPCs attractive candidates for the removal of CO2 from natural gas.
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CRYSTENGCOMM
·
2019
·Vol. 22
·期 2
·248-256
·
IF 3.382
Xiuxia Wang,Chengyan Liu,Junliang Chen,Lei Miao,Shaohai Wu,Xiaoyang Wang,Zhengchuan Xie,Wenjing Xu,Qiufeng Chen
Recently, Ag8SnSe6-based materials, belonging to the family of argyrodite compounds, have been considered as promising thermoelectric candidates due to their intrinsically ultralow lattice thermal conductivity. However, their thermoelectric properties have been rarely investigated because of the intrinsic low carrier concentration. In this work, polycrystalline Ag8SnSe6 bulk materials were successfully synthesized by a bottom-up method by using hydrothermally synthesized Ag8SnSe6 nanocrystals as the precursors. The carrier concentration and mobility of Ag8SnSe6 are successfully enhanced by introducing additional Sn, which should manipulate the self-defects and improve the crystallinity. Thanks to the synergistic optimization of crystal and composition engineering, a maximum ZT value of about 1.22 is achieved for Ag8Sn1.005Se6 at 715 K, which is about 11% higher than that of the pristine sample, and the average ZT is also improved from about 0.65 to about 0.87. This study indicates that crystal engineering and composition engineering play an important role in the thermoelectric properties of Ag8SnSe6 and may provide guidance to improve the thermoelectric performance of other argyrodite compounds.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2018
·Vol. 29
·期 15
·13180-13187
·
IF 2.324
Wang Yan,Wang Yishu,Ma Limin,Han Jing,Guo Fu
Due to the asymmetric structure of Sn unit cell, the electromigration behaviors of Sn based solder joints were significantly depended on the crystal orientation of Sn grain. The present investigation illustrated the effect of Sn grain c -axis on the intermetallic compounds (IMCs) growth under current stressing. The Cu particles reinforced Sn3.5Ag solder joint was selected to obtain various observed surfaces of the sample after 46 days current stressing. The front side, back side, right side and anode side of the sample represented different phenomena, which reflected and proved the importance of c -axis orientation on Cu atomic migration in three-dimension space. Besides, another composite solder joint was polished severe times on the observed surface which was full of IMCs. It showed that the IMCs were covered on the Sn-based solder, and there was crack at the cathode underneath the front surface after 38 days current stressing. The IMC growth behavior would be well understood by systematic study in this work.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Abdul Basit,Junyou Yang,Qinghui Jiang,Zhiwei Zhou,Jiwu Xin,Xin Li,Sihui Li
Here, the intellectual challenges for thermoelectric materials revolves around the strategy of point defect engineering to regulate the electrical and thermal transport nature of Mn 1.06- x Sn x Te ( x = 0, 0.03, 0.035, 0.04, 0.045) materials. The power factor increases with substitution of Sn into the lattice of Mn 1.06 Te leading to enhance the carrier concentrations due to reduction of the band gap. Meanwhile, the thermal conductivity has also been remarkably reduced due to diverse phonon scattering and mass fluctuation by Sn substitution. As a result, a maximum ZT ∼0.93 for Mn 1.06- x Sn x Te ( x = 0.04) sample has been achieved at 873 K, which increases by 56% in comparison with the un-doped sample.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Bin Zhu,Youbing Li,Liyuan Huai,Junfeng Cui,Guoxin Chen,Qing Huang,Jian Zhang,Chunlin Chen
MAX phases have attracted considerable interest due to their structural diversities and potential applications. More than 150 MAX phases have been synthesized, especially expanding the range of A-site atoms from traditional main group elements to subgroup elements with outer layer d electronic structure. However, the functional applications for MAX phases remain somewhat limited. The A-site elements in MAX phases can amplify their inherent properties, transforming primary structural materials into multifunctional materials. As highly catalytic elements, introducing cobalt into the A-site of MAX phases can reveal surprising catalytic activities. Hence, the MAX phase with single-atom-thick cobalt layers was synthesized via an A-site alloying strategy in this work. The obtained V 2 (Sn 2/3 Co 1/3 )C MAX phase demonstrates efficient electrocatalysis in 5-hydroxymethylfurfural (HMF) oxidation reaction along with hydrogen evolution reaction (HER). In-situ electrochemical studies discover that HMF can prevent the self-reconstruction of MAX phase and oxygen evolution reaction (OER). The overall reaction reaches 94.4% yield to 2,5-furandicarboxylic acid (FDCA) at 1.60 V. Density functional theory calculations suggest that the Co-Sn bimetallic synergy in the A-site promotes the reaction. This groundbreaking investigation into using MAX phases for biomass upgrading highlights their potential in green chemistry and beyond.
研究领域:
材料科学
·
催化化学
·
绿色化学
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FUEL
·
2022
·
IF 8.035
Shiwei Ge,Xiaoqing Liu,Jun Liu,Hao Liu,Haiyan Liu,Xiaoping Chen,Guimin Wang,Jianjun Chen,Guojie Zhang,Yongfa Zhang,Junhua Li
A series of y Cu/Ti x Sn 1-x O 2 catalysts for selective catalytic oxidation (NH 3 -SCO) were synthesized using Ti x Sn 1-x O 2 as catalyst support and CuO as active species. Compared with pure TiO 2 support, the strong metal-support interaction between Cu active species and Ti x Sn 1-x O 2 was significantly promoted by the Sn-doping, thereby improving the catalytic activity and N 2 selectivity of the catalyst, which meets the demand of diesel vehicles to completely convert NH 3 . The results of XRD and HRTEM showed that the particle size of 20 Cu/TiSnO 2 sample is much more highly dispersed. The results of NH 3 -TPD and in-situ DRIFTS indicated that the copper species in 20 Cu/Ti x Sn 1-x O 2 can provide more Lewis acid sites than 20 Cu/TiO 2 , which is conducive to the adsorption and reaction of NH 3 . Meanwhile, XPS results proved that adsorbed oxygen on the catalyst surface is the main active oxygen species. Finally, in-situ DRIFTs and kinetic measurements found that the NH 3 -SCO reaction over 20 Cu/TiSnO 2 and 20 Cu/TiO 2 follow the i-SCR and imide (–NH) mechanisms, respectively. This catalyst will provide solutions for the future design and application of ammonia slip from mobile and stationary sources.
研究领域:
催化化学
·
环境科学
·
材料科学
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Zhipeng Lv,Huiping Gao,Yayong Hu,Yunpeng Fan,Gencai Pan,Huafang Zhang,Wenwu You,Zhenlong Zhang,Yanli Mao
Broadband photodetectors covering ultraviolet (UV) to near-infrared (NIR) wavelengths play an essential role in communications, imaging, and biosensing. Developing a single photodetector with a broadband optical response operating at room temperature can significantly reduce the complexity and cost of receiver systems for multispectral applications. In this work, utilizing the porous structure characteristics of Cs2AgBiBr6:Sn thin films, a self-powered detector with broad spectral response (UV–vis-NIR) was achieved by constructing an effective Cs2AgBiBr6:Sn/PDPP3T heterojunction. This photodetector possesses a broad response spectrum from 350 to 950 nm with an average detection rate exceeding 1011 Jones and maintains excellent photoelectric performance over two months. Sn2+ doping effectively reduces the bandgap of Cs2AgBiBr6, enhancing its near-infrared absorption and optimizing energy level alignment with conjugated polymer (diketopyrrolopyrrole-terthiophene, PDPP3T). More importantly, the porous structure derived from Sn doping significantly improves carrier extraction and transport under a near-infrared light response at the heterojunction interface. Utilizing its broad spectral response characteristics in the UV–vis-NIR range, a novel information transfer and encryption system employing full optical modulation has been realized within a single perovskite photodetector. This work provides a new approach to fabricating lead-free double perovskite broadband photodetectors with potential applications in photonic devices.
研究领域:
材料科学
·
光电技术
·
纳米技术
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