Advanced Materials Interfaces
·
2019
·Vol. 6
·期 12
·1900367
·
IF 4.713
Lun Cai,Wenxian Wang,Lei Jin,Zhirong Yao,Wenjie Lin,Lanxiang Meng,Bin Ai,Zongcun Liang,Yuelong Huang,Fuqin Zhang,Pietro P. Altermatt,Hui Shen
Most crystalline silicon (c-Si) solar cells are based on high temperature–processed p-n junctions or highly doped heterojunctions. The concept of dopant-free carrier selective contact has become a research hotspot and been successfully demonstrated with n-type Si wafers, showing the great potential of simplified fabrication process and lower thermal-consuming. However, there are few successful cases on p-Si, dopant-free p-Si/CdS (cadmium sulfide)/ITO (indium tin oxide) solar cells with champion efficiency of 12.29% (device area 4 cm 2 ) have been demonstrated with DC magnetron sputtered CdS thin films working as electron-selective contact. A proper annealing treatment is found essential in improving the p-Si/CdS/ITO heterocontact and device performance. The author's preliminary results confirm the feasibility of preparation of efficient p-Si wafer–based dopant-free solar cells.
研究领域:
材料科学
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能源技术
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JOURNAL OF PHASE EQUILIBRIA AND DIFFUSION
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2017
·Vol. 38
·期 1
·30-36
·
IF 0.938
Sun W. Z.,Cheng J. G.,Huang Z. K.,Jiang Y.,Wu L. E.,Liu L. M.
The present work determined the phase relations in Si-Al-M-O-C (M = Zr, Mg) systems, involving SiC-Al 2 O 3 -ZrO 2 , SiC-Al 2 O 3 -MgO, SiC-SiO 2 -Al 2 O 3 -ZrO 2 and SiC-SiO 2 -Al 2 O 3 -MgO systems by XRD phase analyses of the solid-state reacted samples from powder mixtures of SiC, Al 2 O 3 , ZrO 2 , MgO and SiO 2 . Within these systems, SiC was respectively compatible with other neighboring phases, forming a set of four-phase compatibility tetrahedrons. The subsolidus phase diagrams of the SiC-SiO 2 -Al 2 O 3 -ZrO 2 and SiC-SiO 2 -Al 2 O 3 -MgO quaternary systems were presented.
研究领域:
材料科学
·
陶瓷学
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2024
·
IF 4.3
Guobin Mao,Yuan Zeng,Guangmiao Ding,Chunmin Qiu,Junbiao Dai,Yanhui Wan,Yingxin Ma
Achieving rapid recognition and sensitive detection of multiple heavy metal ions simultaneously is of great significance for the monitoring of public health and environment. Herein, a fluorescence sensing array was constructed using Si dots with two emission centers for efficient discrimination of seven metal ions. Each metal ion had different binding capacities with –OH/–NH 2 groups present on the surface of Si dots and thereby resulting in different changes in fluorescence intensity of the two emission peaks. The changes in fluorescence signals were transformed into unique “fingerprints” and “Euclidean distances” through linear discriminant analysis and hierarchical cluster analysis. The constructed sensing array provided multi-dimensional information to distinguish seven metal ions through a single material and a signal mode and show good linearity for individual metal ion and good performance in the discrimination of metal mixtures, effectively reducing the cost and response time and simplifying the experimental process. This system achieved accurate discrimination of metal ions in actual water samples and has broad application prospects in environmental monitoring.
研究领域:
分析化学
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环境科学
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材料科学
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PubMed
高影响因子
MOLECULES
·
2023
·Vol. 28
·期 7
·3274
·
IF 4.6
Xinwen Ma,Weiduo Fei,Xiandie Zhang,Jie Ji,Xiang Zhou
In this study, mesoporous silicon nanoparticles (M-Si) were successfully prepared by a magnesiothermic reduction of mesoporous silica nanoparticles, which were synthesized by a templated sol-gel method and used as the precursors. M-Si exhibited a uniform size distribution with an average diameter of about 160 nm. The measured BET surface area was 93.0 m2g−1, and the average pore size calculated by the BJH method was 16 nm. The large internal surface area provides rich reaction sites, resulting in unique interfacial properties and reduced mass diffusion limitations. The mechanism of the magnesiothermic reduction process was discussed. The reactivity of prepared M-Si was compared with that of commercially available non-porous Si nanopowder (with the average diameter of about 30 nm) by performing simultaneous thermogravimetry and differential scanning calorimetry in the air. The results showed that the reaction onset temperature indicated by weight gain was advanced from 772 °C to 468 °C, indicating the promising potential of M-Si as fuel for metastable intermolecular composites.Keywords:energetic materials;mesoporous silicon nanoparticles;magnesiothermic reduction;thermal analysis
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INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Yichang Yang,Xiangyu Meng,Longfeng Zhu,Jinghuai Yang,Guoliang Zhang,Hongxia Shen,Xuebo Cao
Rapid synthesis of Si-rich (SiO2/Al2O3 > 100) SSZ-13 zeolite under fluoride-free conditions is highly desirable but still challenging. Herein, we for the first time report a rapid synthesis of all silica and aluminosilicate (SiO2/Al2O3 > 100) SSZ-13 zeolite without the addition of fluoride species. The crystallization could be fully completed at 160 °C for 4 h when the aging of the starting gel is 3 h at room temperature after the addition of a zeolite seed. The key to success is the formation of more basic building units (4- and 6-membered rings) in the initial gel with the aging time of 3 h after the addition of a zeolite seed, leading to the successful rapid synthesis of Si-rich SSZ-13 zeolite. The obtained Si-rich SSZ-13 zeolite displays high crystallinity, uniform cubic morphology with a nanoparticle feature, and a large surface area. More importantly, the obtained Si-rich SSZ-13 zeolite displays excellent performance in the adsorption of ethanol and methanol-to-olefin reaction.
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高影响因子
Materials
·
2023
·Vol. 16
·期 3
·1053
·
IF 3.4
Yanpei Dang,Tianhao Li,Yangzhong Zhao,Liantai Duan,Jianning Zhang,Ke Chen,Liu He,Qing Huang,Chuanzhuang Zhao,Yujie Song
Polyborosilazanes with controllable B/N ratio were synthesized using high-boron-contentm-carborane, dichloromethylsilane, and hexamethydisilazane. After high-temperature pyrolysis, Si–B–C–N quaternary ceramics with SiC and B4C as the main phases were obtained. The B/N ratio in the precursors corresponded to the change in the feeding ratio of carborane and dichloromethylsilane. The effects of boron content and B/N ratio on the ceramic precursors and microphase structure in Si–B–C–N quaternary ceramics were explored in detail through a series of analytical characterization methods. A high boron content results in a significant increase in the ceramic yield (up to 71 wt%) of polyborosilazanes, and at the same time, the B/N molar ratio was regulated from 28.4:1 to 1.62:1. The appearance of the B4C structure in the Si–B–C–N quaternary ceramics through the regulation of the B/N ratio, has rarely been reported.Keywords:polyborosilazane;SiBCN;carborane;polymer derived ceramics;B/N ratio;microphase evolution
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Yanpeng Wang,Hongguang Fan,Lichong Bai,Jinyue Song,Yongcheng Jin,Shuang Liu,Wansu Zheng,Xiaohui Xie,Wei Liu
As attractive anode materials of lithium-ion batteries, both microsized and nanosized silicon particles have been investigated widely, but each has lots of insurmountable problems to restrict their practical applications. In this work, combining the advantages of microsized and nanosized Si particles, we reported a new thought for constructing micrometer-sized Si/C particles by embedding Si nanoparticles into graphene oxide (GO)-based mirorolls. Differing to the traditional spherical shape, the resulted Si/C microrolls exhibit a unique elastic coil structure with opening ends, facilitating the stress buffer and fast charge diffusion. Besides, in order to maintain the stability of Si nanoparticles in microrolls, we chose the elastic and deformable liquid metal (LM) as the “cloth”, and sodium alginate (SA) as the “thread”, successfully tailor a novel “tight suit” for each Si nanoparticle by a facile self-assembly process. Thanks to the double protection of the conductive-elastic LM-SA coating and the microroll architecture, the resulted Si@LM-SA@GO microroll anode not only has a high Si content of 69 %, a high tap density of 0.62 g cm −3 and a high initial coulombic efficiency of 85.1 %, but also exhibits a superior volumetric capacity of 2506 mAh cm −3 , and a superior cycling performance of 660 mAh cm −3 after 500 cycles at 2 A g − 1 . The full cell constructed using a LiNiCoMnO 2 cathode can achieve a high reversible capacity of 150 mAh g −1 at 1C after 250 cycles, delivering a high-energy density of 510 Wh kg −1 .
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高影响因子
COMBUSTION AND FLAME
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2022
·
IF 5.767
Beilin Zuo,Shuai-Zhong Wang,Sulan Yang,Peijin Liu,Qi-Long Yan
In this work, Si@NC/AP and Si@PVDF/CL-20 composites with different Si contents have been fabricated by spray-drying technique. The flame structure, ignition delay time and combustion process have been investigated. It has been shown that the ignition delay of Si-based fuel with 40 wt% of Si is the shortest. This means that oxygen balance and the catalytic effect of Si on the energetic composites are playing a dominant role during the combustion processes of these composites. The solid composite propellants (SCP, named as SCP-1 and SCP-2) contains two typical Si-based composites Si-80@NC/AP and Si-80@PVDF/CL-20 have been prepared for propellant applications. Their propellants containing the corresponding mechanical mixtures (named as SCP-3 and SCP-4) have been fabricated as a comparison. It has been observed that the cross sections of propellants containing Si-based composites are denser than that of the reference propellants. The burn rate of SCP-1 (with Si-80@NC/AP) and SCP-2 (with Si-80@PVDF/CL-20) are 5.74 and 5.10 mm s −1 at 2.0 MPa, respectively, which are lower than those of the reference samples SCP-3 (6.51 mm s −1 ) and SCP-4 (5.70 mm s −1 ). However, the pressure exponent of former is slightly lower than that of the latter. Moreover, the combustion products (CCPs) of SCP-1 and SCP-3 are more fluffy and smaller in particles size than those of SCP-2 and SCP-4. This indicates that the core-shell structured composites have much better combustion performances due to better heat and mass transfer between the oxidizers and Si as fuel.
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高影响因子
ChemSusChem
·
2022
·Vol. 15
·期 8
·e202200188
·
IF 9.14
Chengjin Li,Xiaoxia Zhou,Qingming Zhang,Yi Xue,Zhaoyu Kuang,Han Zhao,Chung-Yuan Mou,Hangrong Chen
Graphical CO 2 to formic acid : A novel kind of Sn/TiO 2 /Si photocathode is developed for CO 2 reduction reaction (CO 2 RR), which shows excellent selectivity to HCOOH under applied potential. The improved light performance and heterojunction composite structure, together with the modulated electronic configuration, co-contribute to the high CO 2 RR performance. Using renewable energy to convert CO 2 into liquid products, as a sustainable way to produce fuels and chemicals, has attracted intense attention. Herein, a novel heterostructured photocathode composed of Si wafer, TiO 2 layer, and Sn metal particles has been successfully fabricated by combining of a facile hydrothermal and electrodeposition method. The obtained Sn/TiO 2 /Si photocathode shows enhanced light absorption performance by the surface plasmon resonance effect of Sn metal. Especially, the Sn/TiO 2 /Si photocathode together with rich oxygen vacancy defects jointly promote photoelectrochemical CO 2 reduction, harvesting a high faradaic efficiency of HCOOH and a desirable average current density (−4.72 mA cm −2 ) at −1.0 V vs. reversible hydrogen electrode. Significantly, the photocathode Sn/TiO 2 /Si also shows good stability due to the design of protecting layer TiO 2 . This study provides a facile strategy of constructing an efficient photocathode to improve the light absorption performance and the electron transfer efficiency, exhibiting great potential in the CO 2 reduction.
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高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Xuran Sun,Jian Jiang,Yong Yang,Yu Shan,Lunlun Gong,Mei Wang
Photoelectrochemical (PEC) water splitting is a promising but immensely challenging technology for sustainable production of hydrogen. To this end, highly active, durable, and inexpensive photocathodes that operate under conditions compatible with those for photoanodes are desired. Herein, Si-based composite photocathodes were constructed by coating the front surface of Si with an N-doped carbon nanolayer and then a TiO2 protective layer, followed by decorating the electrode surface with Ni and Ni–Mo catalysts. The carbon nanolayer, denoted as CPDA, was formed directly on the Si surface by in situ self-polymerization of dopamine, followed by carbonization of the polydopamine (PDA) coating. The performance of the as-fabricated Si photocathodes with and without the CPDA layer was comparatively studied for PEC hydrogen evolution reaction (HER) in alkaline electrolytes to evaluate the effect of the sandwich CPDA layer in between the Si substrate and the TiO2 layer on the photoelectrocatalytic behaviors of Si-based electrodes. The photocathodes containing the CPDA layer demonstrated lower electron transfer resistance, higher built-in photovoltage, and larger band bending relative to the analogous electrodes without the CPDA layer. Accordingly, the short-circuit photocurrents of the Ni and Ni–Mo-decorated photocathodes with the CPDA layer were enhanced by a factor of 2.8–3.3, and their open-circuit photovoltages were enlarged by 0.14–0.22 V, compared to those of the corresponding electrodes without the CPDA layer in 1 M KOH under simulated 1 sun illumination. Moreover, the photocathodes with the CPDA layer also exhibited an improved stability for PEC HER in alkaline solutions, with a faradaic efficiency of 90–97% in the initial hour.
研究领域:
材料科学
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能源科学
·
电化学
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高影响因子
Materials Horizons
·
2025
·
IF 10.7
Evgeny A. Gorbachev,Yifan Wang,Jingtong Duan,Roy R. Nygaard,Ekaterina Kozlyakova,Lev A. Trusov
In this study, we present a principal methodology for semi quantitative analysis of magnetic phase composition during thermogravimetry under a gradient magnetic field, specifically in cycling mode. This approach is demonstrated using Fe-Si-O xerogels, in which magnetic nanophases such as ε-, γ-, and α-Fe₂O₃ can coexist and transform into each other. We introduce a novel, time-efficient quasi in situ approach to identify and optimize heat treatment conditions for synthesizing ε-Fe₂O₃ as a single phase, a material with significant industrial demand. Our results provide a valuable framework for advancing the controlled synthesis of magnetic compounds.
研究领域:
材料科学
·
磁性材料
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纳米材料合成
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热分析
·
固态化学
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高影响因子
CARBOHYDRATE POLYMERS
·
2024
·
IF 10.7
Tongjun Yang,Rongli Li,Mingtao Ding,Hong Yu,Lihua Zhang,Haibo Xie
Chitin nanocrystals (ChNCs), prepared from a down-sizing process from chitin, have recently captured great attention to access sustainable nanomaterials. The surface modification of ChNCs is crucial to regulate the surface physicochemical properties and introduce specific functions, thus satisfying their diverse applications. In this study, aldehyde-functionalized ChNCs (ChNCs-PVMA) with enhanced hydrophobicity were developed via surface-initiated activators regenerated by electron transfer for atom transfer radical polymerization (SI-ARGET ATRP) of a lignin-derived polymerizable aldehyde monomer, vanillin methacrylate (VMA). The monomer conversion was determined by 1 H NMR spectroscopy of the reaction mixture based on the change of the relative ratio of VMA and solvent signals. The prepared ChNCs-PVMA were systematically characterized by FTIR, CP/MAS 13 C NMR, XPS, XRD, DSC, TGA, and TEM. The dispersibility of ChNCs and ChNCs-PVMA in water and DMF was evaluated by dynamic light scattering and visual observation, indicating good dispersion of ChNCs-PVMA in organic solvents. Furthermore, based on the available aldehyde groups, the ChNCs-PVMA was reacted with amino acids via Schiff base reaction, demonstrating a rich follow-up chemistry towards diverse functions by the reactive aldehyde groups.
研究领域:
材料科学
·
化学工程
·
生物材料
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高影响因子
危险品化学品经营许可证（带存储）