Materials Today Chemistry
·
2023
·
IF 7.3
L. Liu,J. Su,X. Zhou,D. Liang,Y. Liu,R. Tang,Y. Xu,Y. Jiang,Z. Wei
Presently, the low ionic conductivity of Na super ionic conductor (NASICON) electrolytes is one of the main obstacles to the development of solid-state sodium batteries . Most researchers focus on the modified NASICON by doping with foreign elements and have not paid much attention to the effect of the composition changing by adjusting the ratio of elements in Na 1+x Zr 2 Si x P 3-x O 12 (0 ≤ x ≤ 3) on the ionic conductivity . In order to clarify the relationship between the ionic conductivity and the structure/composition of Na 1+x Zr 2 Si x P 3-x O 12 , the ionic conductivity dependence on the Si/P ratio is systematically investigated in this study. The obtained results demonstrate that the ionic conductivity variation of NASICON is close to an order of magnitude i.e. the ionic conductivity of Na 1+x Zr 2 Si x P 3-x O 12 is much more sensitive to the Si/P ratio in the structure. This means that it is crucial to control the composition during the preparation process to obtain the electrolyte with high ionic conductivity. The strong composition-dependent property of Na 1+x Zr 2 Si x P 3-x O 12 can be attributed to the change of current carrier concentration, crystal structure, and sintering property resulting from the Si/P ratio. The results are insightful for further understanding the conducting characteristics of Na 1+x Zr 2 Si x P 3-x O 12 material and its derivatives.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
FUEL PROCESSING TECHNOLOGY
·
2025
·
IF 7.7
Jie Yao,Hao Liu,Wei Liu,Jianxin Nie,Shi Yan,Xueyong Guo
Metal fuels are widely used in energetic materials to improve their energy release. Al Si alloy fuel is an aluminum-based alloy fuel, and its slow reaction rate limits its potential application in energy material systems. Herein, Al-Si-Mg AlSi9Mgx alloy fuel had been designed and successfully prepared by gas atomization to achieve excellent reactivity characteristics. The reaction characteristics of the fuel were systematically measured by thermal analysis (TG-DSC), bomb calorimeter, volumetric explosion vessel system and laser ignition measurement. Due to the addition of highly active magnesium, the activation energy of alloy fuel was reduced, and the combustion efficiency was increased to more than 99 %, and the ignition delay time was reduced by 6.7 ms and 33.6 ms respectively. Combustion of potassium perchlorate (KP) mixtures shows that AlSi9Mgx alloy fuels had a faster flame propagation rate, 22.814 mm/s and 42.543 mm/s. The superior reaction properties of AlSi9Mgx alloy fuel are due to the presence of internal solid solution Mg or low melting point alloy compound. This work and design provide a reliable method for optimizing the energy output of alloy fuels.
研究领域:
材料科学
·
能源工程
·
冶金学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Sustainable Energy & Fuels
·
2018
·Vol. 2
·期 4
·820-826
·
IF 0
Ming Chen,Gang Wu,Minmin Zhang,Jie Liu,Jiantao Zai,Xuefeng Qian,Xibin Yu
Photovoltaic modules are considered as the most efficient way to utilize solar energy, while the power conversion efficiencies of commercial crystalline silicon (c-Si) solar cells still need to be improved. Herein, nano-graphite was designed as a highly efficient electron transport layer in high performance ZnO/Si solar cells and prepared via a simple solution phase deposition and rapid annealing process. The ZnO QDs can broaden the range of spectral response by generating more electron–hole pairs via multiple exciton effects. The built-in-field formed between the n-type ZnO QD layer and n-type Si and highly conductive nano-graphite can accelerate the electron collection and transportation from n-type Si to the front electrode. Thus, the designed Si solar cell with nano-graphite and ZnO QD layers shows a significantly improved power conversion efficiency of 14.99% compared to the ZnO/Si solar cell (13.62%) and unmodified commercial c-Si solar cells (12.73%). This cost effective and environmentally friendly technology can be easily applied for the industrial scale production of Si solar cells.
研究领域:
材料科学
·
光伏技术
·
能源工程
✓ 已验证
产品关联
DOI
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Sinian Jiang,Bin Zhang,Xinyu Liu,Jingchun Cao,JunJie Ge,Kexin Men,Yuxiong Jiang,Xiaocong Wang
As a promising anode for lithium-ion batteries (LIBs), silicon (Si) has been studied due to its high specific capacity. However, significant volume change during charge-discharge process has seriously impeded its practical application. Compounding with carbon is one of the methods to solve this problem. In this paper, biomass carbon is prepared by high temperature carbonization of Chinese rose petals. Different mass ratios of Si nanoparticles are embedded in the biomass carbon to produce C@Si composites. The as-prepared C@Si composites are assembled into LIBs to investigate their electrochemical performance. As an anode material for LIBs, the manufactured C@Si composite material (Si-25 wt%) manifests a stable cycling performance (524 mAh•g −1 at 0.1 A•g −1 after 100 cycles), a long cycle life (581 mAh•g −1 at 1 A•g −1 after 400 cycles) and excellent rate capability. And its initial coulombic efficiency at the current density of 1 A•g −1 (99.62 %) is much larger than that of pure nano-Si (29.45 %). The electrochemical impedance spectroscopy (EIS) results indicate that the C@Si composite materials can behave as an ideal capacitor. This study reveals the possibility of changing flower petals to carbon material and the potential applications in the field of LIBs.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
Materials Advances
·
2025
·
IF 4.7
Zheng Zhou,Shibo Chen,Yingming Shen,Juan Wang,Guijun Zhang,Yang Shi,Haixia Wu,Jingjing Luo,Xiaohong Cheng,Yang Yu
PEDOT:PSS/Si heterojunction solar cells (HSCs) with simple preparation process and low production costs has attracted a lot of attention. The adjustable color and good stability of devices will greatly expand their application scenarios. In this work, a liquid crystal molecule, 5,5'-bis(9-(3,4,5-tris(tetradecyloxy)benzyl)-9H-carbazol-3-yl)-2,2'-bithiophene (DT), is used as the additive and coating to fabricate colored and stable PEDOT:PSS/Si HSCs. The DT as the additive into PEDOT:PSS films can improve the conductivity of films and the junction quality of devices, leading to enhanced power conversion efficiency (PCE) of 13.24% for the uncolored devices. On based of PEDOT:PSS films adding DT, DT films with different thickness as coatings were spin-coated on the top surface of the uncolored devices, fabricating multi-color devices with the higher PCE, compared to the control devices. DT coatings can isolate air and absorb ultraviolet (UV) light, obtaining the enhanced stability for colorful devices in the air and under extreme UV irradiation. In addition, it was found that DT coatings can effectively avoid the poor uniformity of PEDOT:PSS films and disrupted linear structure of PEDOT chains under UV illumination. The work provides promising strategies for the preparation of colored and stable PEDOT:PSS/Si HSCs with high efficiency.
研究领域:
材料科学
·
能源技术
·
光电化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Yi Zheng,Qiuya Zhang,Haoran Chi,Yize Liu,Hongwei Ren
As a typical pollutant in petrochemical wastewater, naphthenic acids are highly ecotoxic and difficult to biodegrade due to its robust structure. The advanced oxidation process has always been the research hotspot for naphthenic acids degradation and removal. In this work, with low cost and biomass fructose as raw material, Si-doped carbon quantum dots (Si-CQDs) and its composite material (MoS 2 /Si-CQDs) of Flower-like molybdenum disulfide (Flower-like MoS 2 ) were targeted synthesized by hydrothermal method, and characterized by Transmission electron microscope, Scanning electron microscope, X-Ray diffraction, UV-Vis spectroscopy, and Raman spectrum. To study the activation of prepared materials in naphthenic acid oxidative degradation, the influencing factors of kinds of materials, reaction temperature, the dosage of catalyst and persulfate were all explored systematically. The experiments showed that the naphthenic acid degradation rate of MoS 2 /Si-CQDs@NaPS system could reach more than 99 % in 120 min, and the relationship between the naphthenic acid degradation rate and the reaction temperature was in accordance with the quasi-primary kinetic equation. In mechanistic studies, the role of free radical and non-free radical pathways in oxidative degradation was verified. After five reuse cycles, the catalyst can still achieve a degradation rate of over 80 %. Finally, the experiment also tested the effectiveness of MoS 2 /Si-CQDs@NaPS system in real naphthenic acids wastewater, and the production cost of its removal of naphthenic acids was economically analyzed, showing that MoS 2 /Si-CQDs is a promising composite with stability and cost-effectiveness, and provides a new material for naphthenic acid degradation that can achieve a dual degradation pathway.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
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.
研究领域:
材料科学
·
电化学
·
可再生能源
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Metals
·
2023
·Vol. 13
·期 5
·937
·
IF 2.9
Chuanbin Wang,Yongxin Cheng,Sumeng Hu,Kejia Kang,Yuzhe Han,Xudan Zhang,Ronghan Wei,Guoqiang Luo
W-Si-C composites with high relative densities and good mechanical and wear properties were successfully prepared by spark plasma sintering. The influence of SiC content on the relative density, microstructure, mechanical properties and wear characteristics was investigated. The results indicated that the reaction between SiC and W at their interface produced W2C and W5Si3. SiC also reacted with oxygen impurities at the W grain boundary to form SiO2. The purification of the grain boundaries of W was carried out by SiO2synthesis. Reactive sintering reduces the free energy of the system and facilitates the densification process of W-Si-C composites. This results in a significant increase in the relative density of W-Si-C composites, which reaches a maximum of 98.12%, higher than the 94.32% of pure tungsten. The hardness significantly increases from 4.33 GPa to 8.40 GPa when the SiC content is 2 wt% compared to pure tungsten due to the generation of the hard ceramic phase and the increase in relative density. The wear resistance of the W-Si-C composites was significantly improved with little SiC addition. The wear rate significantly decreased from 313.27 × 10−3mm3/N·m of pure tungsten to 5.71 × 10−3mm3/N·m of W-0.5 wt% SiC. SEM analyses revealed that the dominant wear mechanism of pure tungsten was attributed to fatigue wear, while that of W-Si-C composites was due to abrasive wear.Keywords:W-Si-C composites;spark plasma sintering;interface reaction;mechanical properties;wear characteristics
研究领域:
材料科学
·
机械工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Catalysis
·
2024
·
IF 11.3
Long Cheng,Rong Wang,Wenzhe Si,Yanxi Deng,Junhua Li,Yue Peng
Cu-based catalysts leveraging Cu+/Cu0 active sites have emerged as pivotal for synthesizing essential hydrocarbons and alcohols in electrochemical CO2 reduction, such as ethylene and ethanol (C2 products). However, the dynamic reduction of Cu+ to Cu0 during electroreduction leads to site instability, resulting in diminished efficiency for CO2 conversion to C2 products. Herein, we introduced Si into CuO by the selective dissolution method, engendering Cu–O–Si units to stabilize the Cu+/Cu0 sites. The catalyst manifested good activity in CO2 electroreduction with an elevated Faradaic efficiency for C2 products reaching 81.9% at −100 mA/cm2. After ten cycles of electrochemical testing, the Cu+/Cu0 sites and performance exhibited no signs of degradation. The Si incorporation significantly improved the hybridization of O 2p and Cu 3d orbitals, thereby reinforcing the Cu–O bonds and stabilizing the Cu+/Cu0 sites, which was critical in promoting C–C coupling via decreasing the energy barriers for *OCCO formation and enhancing C2 product selection. The active Cu+ cations with unsaturated coordination contributed to the reaction stabilization, thereby improving the preservation of Cu2O metastable state.
研究领域:
电化学
·
催化
·
材料科学
·
能源转化
✓ 已验证
DOI
高影响因子
JOURNAL OF CATALYSIS
·
2022
·
IF 8.047
Yamei Lin,Fei Wang,Enxiang Ren,Fuying Zhu,Qiang Zhang,Guo-Ping Lu
The development of novel iron heterogeneous catalysts for organic synthesis is attractive and significant for both academic and industrial applications. A carbon-based iron heterogeneous catalyst (Fe@NSiC) comprising of different iron species including iron atomic single sites (FeN x Si y ), iron silicate and iron nanoparticles (NPs) has been developed. This catalyst exhibits high performance on the solvent-free synthesis of pyrroles from nitroarenes and 2,5-hexanedione via cascade reaction using HCOOH/DBU as the reductant. Si doping can increase Lewis acid sites of the catalyst and the electron density of iron sites, thus promoting the reaction. Furthermore, a set of pyrroles reflecting potential interest from the pharmaceutical perspective are obtained with moderate to excellent yields in this chemistry.
研究领域:
催化
·
有机化学
·
药物化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2014
·Vol. 73
·期 1
·270-277
·
IF 1.547
Liu Panxing,Xie Shuangfei,Peng Muyang,Ni Liang,Tang Yuefeng,Chen Yanfeng
Abstract Hollow SiO 2 nanospheres were fabricated by a modified Stöber method. Hollow Si–SiC composite nanospheres were firstly prepared by reducing the hollow SiO 2 nanospheres by a low temperature magnesiothermic reduction method. In the final samples of hollow Si–SiC composite nanospheres, the hollow nanosphere structure of the precursor was well preserved. SiO 2 nanospheres and Si–SiC composite nanospheres with hollow structure were observed by Scanning electron microscopy and Transmission electron microscopy. Nitrogen absorption–desorption measurement indicated that Si–SiC composite nanospheres had large BET surface area of 150.33 m 2 /g and pores about 12.9 nm, and the hollow structure was indirectly confirmed. X-ray diffraction, X-ray photoelectron spectroscopy, and TG-DSC were also carried out to characterize microstructure and composition of the final samples. Graphical Abstract
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
IONICS
·
2019
·Vol. 25
·期 12
·5809-5818
·
IF 2.289
He Yuanhong,Lin Yangfan,Jiang Jingwei,Yang Deren,Du Ning,He Xueqin,Ren Jianguo,He Peng,Pang Chunlei,Xiao Chengmao,Chen Yifan,Bao Liang
Silicon is regarded as the next-generation alternative anode material of lithium–ion battery due to the highest theoretical specific capacity of 4200 mAh g −1 . Nevertheless, the drastic volume expansion/shrink (~ 300%) during the lithiation/delithiation process and the poor electrical conductivity obstruct its commercial application. Herein, we report a novel design of litchi-structural Si@C nanoparticles (L-S Si@C) as long cycle life anode material for lithium–ion battery. The L-S Si@C with nanosized (~ 50 nm) SiC dispersed in the inner surface and ~ 6 wt% carbon layer covering the outer surface delivers a specific capacity of 1145 mAh g −1 in the initial cycle and maintains a specific capacity of 570 mAh g −1 after 300th cycling times, which can be attributed to the specially structurally stable L-S Si@C nanoparticles.
研究领域:
材料科学
·
能源存储
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）