FUEL
·
2020
·
IF 5.578
Guo Qiu,Biaohua Chen,Chongpin Huang,Ning Liu,Xiuliang Sun
Methods for the conversion of carbohydrates into 5-hydroxymethylfurfural (5-HMF), which is an important platform chemical, have been attracted extensive attention. In present study, Sn modified ionic liquid polymer (PIL-Sn) was prepared by one-pot polymerization of imidazole and epichlorohydrin, and utilized as a novel and efficient catalyst for 5-HMF production. The optimal 5-HMF yield of 51.1% with 99% conversion was obtained from glucose catalyzed by PIL-Sn in dimethyl sulfoxide at 130 °C with reaction time of 1 h. This catalytic system can also be applied for the transformation of other carbohydrates with satisfactory yields. The mechanism of PIL-Sn-catalyzed conversion of glucose to 5-HMF has been studied using density functional theory (DFT) calculations. The DFT results showed that the five-coordinated SnCl 5 - as a preferred species played an important role in the isomerization of glucose to fructose. This research provides a new strategy to design efficient catalysts for 5-HMF synthesis.
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ADVANCED MATERIALS
·
2023
·Vol. 35
·期 48
·2307042
·
IF 29.4
Mingbian Li,Yuhong He,Xiaopeng Feng,Wei Qu,Wei Wei,Bai Yang,Haotong Wei
Tin perovskites have emerged as a promising alternative material to address the toxicity of lead perovskites and the low bandgap of around 1.1 eV is also compatible with tandem solar cell applications. Nevertheless, the optoelectronic performance of solution-processed tin perovskite single-crystal counterparts still lags behind because of the tin instability under ambient conditions during crystal growth and limited reductants to protect the Sn 2+ ions from oxidation. Here, the reductant engineering to grow high-quality tin perovskite single crystals under ambient conditions is studied. Oxalic acid (H 2 C 2 O 4 ) serves as an excellent reductant and sacrificial agent to protect Sn 2+ ions in methanol due to its suitable redox potential of −0.49 V, and the CO 2 as the oxidation product in the gas state can be easily separated from the solution. The FPEA 2 SnI 4 single crystal grown by this strategy exhibits low trap density perovskite surface by constructing an FPEA 2 PbI 4 -FPEA 2 SnI 4 (FPI-FSI) single crystal heterojunction for X-ray detection. An improved X-ray sensitivity of 1.7 × 10 5 µC Gy −1 cm −2 is realized in the heterojunction device, outperforming the control FPEA 2 PbI 4 counterpart.
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高影响因子
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
·
2023
·Vol. 54
·期 11
·4332-4341
·
IF 2.8
Li Hang,Dong Longhao,Duan Hongjuan,Huang Zhong,Li Yage,Liu Xuefeng,Huang Ren,Jia Quanli,Ye Hang,Zhang Haijun,Zhang Shaowei
Non-oxide ceramic aerogel draws increasing attention in area of thermal insulation because of its low density, high temperature resistance and good chemical/thermal stability. Here, a BCN-TiN composite aerogel was prepared by an in-situ carbothermal reduction/nitridation method, using melamine (C 3 N 6 H 6 ), boric acid (H 3 BO 3 ), chitosan ((C 6 H 11 NO 4 ) n ) and titanium dioxide (TiO 2 ) as raw materials. The aerogel prepared at 1473 K showed a porosity high up to 97.6 pct with a density of 0.05 g/cm 3 . When testing at a temperature of 673 K, the thermal conductivity value of as-obtained composite aerogel was as low as 0.135 W/(m K). Moreover, the lightweight BCN-TiN aerogel had the high-temperature stability (at least 1473 K) and good compression strength, which ensures it a potential high-temperature insulation material in inert atmosphere. Graphical Abstract
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JOURNAL OF APPLIED PHYSICS
·
2023
·Vol. 134
·期 8
·
IF 3.2
Li Gaojie,Zhang Linqi,Du Kai,Wang Xinxin,Yin Menghao
Reducing the working temperature and increasing sensitivity and selectivity has always been a research hotspot in the field of MOS based gas sensors. In this work, improved triethylamine (TEA) sensing performance and mechanism of SnO 2 by doping Pd have been investigated. SnO 2 nanoparticles and Pd-SnO 2 with different doping amounts of Pd (0%, 0.1%, 0.3%, 0.5%, and 0.7%) were successfully prepared by the hydrothermal method. The size of SnO 2 nanoparticles is very uniform (∼15 nm). The SnO 2 sensor exhibited the highest sensitivity to ethanol at 290 °C. After Pd doping, Pd/SnO 2 sensors not only reduced the optimum working temperature but transformed selectivity from ethanol to TEA. In the Pd-SnO 2 system, the 0.5Pd-SnO 2 sensor exhibited high sensitivity (61), fast response-recovery properties (16 s/6 s) to 50 ppm TEA, lower detection limits (0.1 ppm), good repeatability, and higher selectivity. Furthermore, based on density functional theory calculations, the improved TEA sensing performance of 0.5Pd-SnO 2 sensors can be attributed to the improved surface activity of SnO 2 by Pd doping and the catalytic activation of O 2 and TEA by Pd.
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International Journal of Electrochemical Science
·
2023
·
IF 1.5
Van Tu Nguyen,Yue Li Liu,Shah Abdul Hakim,Amr Rady Radwan,Bin Wei,Wen Chen
Fe 2-x Sn x (MoO 4 ) 3 samples were successfully synthesized by wet chemical route. The analytical results of X-ray diffractions indicated that the additions of tin have not destroyed the lattice structure of Fe 2-x Sn x (MoO 4 ) 3 , but increased the units cell volume. Fe 2-x Sn x (MoO 4 ) 3 can be exhibited higher discharge /charge capacities and better cycle-stability than the pristine one. At room temperature, the initial discharge capacity of Fe 1.95 Sn 0.05 (MoO 4 ) 3 is 83.12 mAh g -1 at a discharge rate of 0.5 C and remains 78.81 after 50 cycles. The improved electrochemical properties can be explaining with the presence of tin in the lattice of Fe 2 (MoO 4 ) 3 by improved the structure stability and electrical conductivity.
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Journal of Cleaner Production
·
2023
·
IF 11.1
Can Liu,Haojie Ge,Linxue Yan,Xiaoping Yu,Yafei Guo,Nelson Belzile,Tianlong Deng
The removal of Cs from radioactive wastewater remains a great challenge due to the presence of a large number of coexisting ions. Herein, a novel porous fiber-supported metal tin sulfide named PVC-[Me 2 NH 2 ] 2 Sn 3 S 7 was designed. Specifically, four tin sulfides were prepared by the one-pot method in different solvents. Water was the most suitable solvent since it was essential for converting amides to cations. When three amides were used as precursors, [Me 2 NH 2 ] 2 Sn 3 S 7 prepared with DMF showed the best adsorption performance. Five polymers were then comprehensively evaluated around physicochemical stability, hydrophilicity , and cost to facilitate the engineering application of adsorbents. Finally, polyvinyl chloride (PVC) was selected as the support material. The optimized porous PVC-[Me 2 NH 2 ] 2 Sn 3 S 7 fiber with 50 wt% [Me 2 NH 2 ] 2 Sn 3 S 7 percentage can reach adsorption equilibrium within 30 min, has a wide active pH range of 2–12, and has a high adsorption capacity of 419.01 mg g −1 . When applied to simulated wastewater, the separation coefficients of Cs + and coexisting ions were above 1 × 10 4 . The Cs + adsorption enthalpy change was obtained by calorimetric study and simulation calculation. Even after 50 consecutive cycles, the removal efficiency barely decayed. The Cs + concentration could be enriched to 259.93 times that of the geothermal water . The above advantages make PVC-[Me 2 NH 2 ] 2 Sn 3 S 7 a promising adsorbent for selective Cs + removal from wastewater.
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Nanoscale Research Letters
·
2019
·Vol. 14
·期 1
·1-11
·
IF 3.159
Song Liming,Lukianov Anatolii,Butenko Denys,Li Haibo,Zhang Junkai,Feng Ming,Liu Liying,Chen Duo,Klyui N. I.
Abstract In this work, the hierarchical tin oxide nanoflowers have been successfully synthesized via a simple hydrothermal method followed by calcination. The as-obtained samples were investigated as a kind of gas sensing material candidate for methanol. A series of examinations has been performed to explore the structure, morphology, element composition, and gas sensing performance of as-synthesized product. The hierarchical tin oxide nanoflowers exhibit sensitivity to 100 ppm methanol and the response is 58, which is ascribed to the hierarchical structure. The response and recovery time are 4 s and 8 s, respectively. Moreover, the as-prepared sensor has a low working temperature of 200 °C which is lower than that for other gas sensors of such type has been reported elsewhere. The excellent sensitivity of the sensor is caused by its complex phase mixture of SnO, SnO 2 , Sn 2 O 3 , and Sn 6 O 4 revealed by XRD analysis. The proposed hierarchical tin oxide nanoflowers gas sensing material is promising for development of methanol gas sensor. Graphical Abstract The as-obtained hierarchical tin oxide nanoflower (HTONF) gas sensor shows excellent gas-sensing performance at low working temperature (200 °C) and high annealing temperature (400 °C).
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Baosong Li,Dandan Li,Jun Zhang,Wei Chen,Weiwei Zhang
The incorporation of TiN and Y 2 O 3 nanoparticles together into Ni-W matrix have been investigated by pulse electrodeposition in present study. The microstructural, surface properties and corrosion resistance of Ni-W/TiN-Y 2 O 3 nanocrystalline coating have been studied. It illustrated that the electrodeposited coatings have dense and nodular structure without defects. Results confirmed that TiN and Y 2 O 3 particles were uniformly embedded in the composites. The embedded particles could improve the hardness and anti-corrosion properties of the obtained coating. The crystallite size calculated based on the preferred orientation (111) plane was of 14–17 nm, illustrating the formation of nanocrystalline structure. The mean R a value was about 84.6 nm. Electrochemical impedance tests revealed that the preferred combination of operating parameters for optimum corrosion resistance was 70%, 1000 Hz, 40 min and 4 A dm −2 . However, the best hardness and anti-wear properties were obtained at parameters of 50%, 500 Hz, 6 Adm −2 and 60 min. The extreme values of hardness and corrosion resistance were not realized simultaneously. The operating parameters should be kept in a certain balance to avoid the formation of inferior properties in any aspects of the coating; then the other performance advantages could be brought into full play. The preferred combination of operating parameters was optimized to be duty cycle of 70%, frequency of 1000 Hz, duration time of 40 min and average current density of 4 Adm −2 , which enabled the electrodeposited coating optimum corrosion resistance and high mechanical properties .
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JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
·
2018
·Vol. 28
·期 1
·423-430
·
IF 1.34
Wang Bin,Du Jinjing,Gao Shoukun,Fang Zhao,Zhu Jun,Li Linbo
NiFe 2 O 4 /nano-TiN ceramics were fabricated by a two-step cold-pressing sintering process. Effect of sintering atmosphere (air, nitrogen, argon) on the synthesis process of NiFe 2 O 4 /nano-TiN ceramics was investigated. The DSC-TG and XRD analysis results indicated that besides principal phases of NiO and NiFe 2 O 4 , new-phase Ni 3 TiO 5 formed in the sintered ceramics under the three sintering atmospheres, and metallic phase including iron and nickel appeared in the sintered samples with inert gas (nitrogen, argon) sintering condition. Microstructure analysis results showed that considerable quantity of micropores appeared in the ceramic samples sintered under inert gases (argon, nitrogen), but lower porosity (3.0, 3.6%) and higher densities (4.78 g/cm 3 , 4.51 g/cm 3 ) can be obtained, comparing to the both values (14.4%, 4.17 g/cm 3 ) for the ceramic samples sintered under air atmosphere. Besides, the average bending strength and elastic modulus of the samples sintered under argon is 113.75 MPa and 7.13GPa, which is higher than that of 75.12 MPa, 5.42GPa and 91.96 MPa, 6.26GPa for the samples synthesized under air and nitrogen, separately. When changing sintering atmosphere from air to inert gases (argon, nitrogen), the fracture model of the 4 wt.%nano-TiN/NiFe 2 O 4 ceramics synthesized at 1400 °C for 4 h transformed from intergranular fracture to intergranular-transgranular fracture.
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ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Jinyin Zhang,Yanyan Lou,Miaomiao Liu,Hualan Zhou,Yin Zhao,Zhuyi Wang,Liyi Shi,Dongdong Li,Shuai Yuan
The transmittance and conductivity of fluorine-doped tin oxide (FTO) conductive glasses are the critical factors limiting the performance of dye-sensitized solar cells (DSSCs). Here, the transmittance and conductivity of commercial FTO glasses were improved via a colloid–solution deposition planarization (CSDP) process. The process includes two steps. First, the FTO nanocrystal colloid was deposited on the FTO glasses by spin-coating. Secondly, the coated glasses were treated by FTO precursor solution. Compared to the bare FTO glasses, the modified FTO glasses by the CSDP process achieved 4% increase in transmittance (at 550 nm) and 11% decrease in sheet resistance, respectively. In addition, the modified FTO glasses can reduce the aggregation of Pt nanoparticles and improve the electrocatalytic activity of Pt counter electrodes. When the modified FTO glasses were used to assemble DSSCs, the cells got a photoelectric conversion efficiency as high as 9.37%. In contrast, the efficiency of reference cells using bare FTO substrates was about 8.24%.
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Micro & Nano Letters
·
2019
·Vol. 14
·期 10
·1087-1091
·
IF 0.975
Haikun Zhou,Pan Wang,Pingping Gao,Xiaobo Wu,Zhiyong Xie
Titanium nitride (TiN)-modified hydrophobic-treated carbon paper (CP) was prepared by impregnating CP with polytetrafluoroethylene (PTFE) emulsion containing TiN nanoparticles (NPs). Electrochemical measurements showed that CP witnessed an increase in corrosion resistance and electrical resistivity after treated with 5 wt% PTFE emulsion. Since the sacrifice in electrical conductivity is not beneficial to the application in proton exchange membrane fuel cells (PEMFCs), conductive ceramic NPs – TiN NPs were introduced into the CP to further improve its electrical conductivity. It was found that after adding TiN NPs, the electrical resistivity of CP (immersed in 5 wt% PTFE emulsion containing 8 wt% TiN NPs) decreased to a level (3.8 mΩ cm) similar to that of untreated CP (3.5 mΩ cm), and meanwhile there is a further improvement in corrosion resistance, where the corrosion current density (at 1.4 V) of TiN-modified CP stabilises at the lowest value of 5.50 μA/cm 2 , as compared with 32.8 and 12.7 μA/cm 2 for raw CP and PTFE-treated CP. According to microstructure characterisation, these improvements could be attributable to the formation of conductive networks and improved PTFE distribution due to the addition of TiN NPs.
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ACS Sustainable Chemistry & Engineering
·
2025
·
IF 7.3
Yang Hao,Jingkun Ren,Mengxue Sun,Xiaoxiao Geng,Yaohui Gu,Yuan Li,Yuying Hao
SnSe quantum dots (QDs) exhibit exceptional photoelectric and thermoelectric properties, making them highly promising for a wide range of applications in both photoelectric and thermoelectric devices. However, the scalable production of high-quality SnSe QDs with high yield remains a significant challenge. In this study, we present a borax-assisted ball-milling and sonication-assisted solvent exfoliation method to prepare SnSe QDs with lateral sizes on the scale of 5 nm from SnSe single crystals. The resulting SnSe QDs feature pristine surfaces, high crystallinity, and an impressive yield of 43.3%. The thin film formed by these pristine SnSe QDs displays a broad band gap and strong photoluminescence. In addition, a SnSe QDs thin film is utilized as an electron transfer layer (ETL) in n-i-p perovskite solar cells (PSCs), achieving a photoelectric conversion efficiency (PCE) of 21.33%, approaching the PCE (22%) of SnO2-based PSCs and significantly higher than the PCE of 14.49% observed in PSCs without an ETL. Furthermore, when the SnSe QD thin film is modified by streptomycin sulfate, the PCE of the corresponding PSC increases to 23.20%. This method for preparing SnSe QDs not only facilitates large-scale production but also opens up new avenues for a comprehensive exploration of their performance potential and shows the prospect of SnSe QD application in optoelectronic devices.
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