JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2012
·Vol. 17
·期 4
·961-968
·
IF 2.131
Yue Lu,Zhong Haoxiang,Tang Daoping,Zhang Lingzhi
A novel porous Si/S-doped carbon composite was prepared by a magnesiothermic reaction of mesoporous SiO 2 , subsequently coating with a sulfur-containing polymer-poly(3,4-ethylene dioxythiophene), and a post-carbonization process. The as-prepared Si composite was homogeneously coated with disordered S-doped carbon with 2.6 wt.% S in the composite and retained a high surface area of 58.8 m 2 g −1 . The Si/S-doped carbon composite exhibited superior electrochemical performance and long cycle life as an anode material in lithium ion cells, showing a stable reversible capacity of 450 mAh g −1 even at a high current rate of 6,000 mA g −1 .
研究领域:
材料科学
·
电化学
·
能源存储
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高影响因子
Science Bulletin
·
2023
·
IF 18.9
Chen Zhu,Shiming Chen,Ke Li,Zu-Wei Yin,Yinguo Xiao,Hai Lin,Feng Pan,Luyi Yang
Despite the high theoretical capacity, silicon (Si) anode suffers from dramatical capacity loss, due to its massive volume swings (up to 300%) during cycling. Hence, thorough understanding of the structural evolution mechanism is necessary and essential for performance optimization of Si anode. Herein, a multi-scale three-dimensional (3D) image reconstruction technique is firstly applied to visualize the structural evolution process of Si anodes. Three key components (Si particles, inactive components, and voids) in the electrode are quantitatively analyzed by the focused ion beam and scanning electron microscope (FIB-SEM) technology. Furthermore, the average sizes of Si particles were run statistics during the cycling. By combining the componential observation within the electrode (macroscopic information) and the 3D models of the particle with solid electrolyte interphase (SEI) layer (microscopic information), the failure mechanism of Si anode is vividly demonstrated. This work establishes a new methodology to quantitatively analyze the structural and compositional evolution of Si anode, which could be further applied for the studies of many other electrode materials with similar issues.
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DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2022
·Vol. 46
·期 13
·18100-18108
·
IF 4.672
Yuanyuan Feng,Yubo Yang,Chengfei Yang,Huimin Sun,Xiaowei Miao,Hongmei Ji,Gang Yang
Summary Although the high-capacity Si/graphite anode serves to advance the energy density of lithium-ion batteries, the volume change remains the main disfigurement of Si/graphite anode. Many studies show that crosslinked structure binders tend to play a good inhibitory effect on volume expansion. In this work, a three-dimensionally covalently cross-linked and flexible polyimides (C–PI–OH) is successfully synthesized and applied as silicon/graphite anode, which is composed through a tri-monomer co-polycondensation and crosslinking process. The as-formed free carboxylic acid groups and amide groups in C–PI–OH are efficient in structural stability, so the electrode bound by C–PI–OH exhibits the highest peeling strength than C–PI and polyvinylidene fluoride. The flexible network of the C–PI–OH binder is competent for accommodating the volume expansion and contraction of silicon particles during the deintercalation of lithium ion, which helps in the wholeness of solid electrolyte interface film and electrodes, and effectively boosting the cycle stability of the Si/graphite anode.
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APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2022
·Vol. 128
·期 9
·1-9
·
IF 2.983
Liu Fu,Wang Mingjie,Chen Yao,Gao Jianmin
When graphene is used to enhance reaction-bonded silicon carbide (RBSC), the problem of graphene being corroded by molten silicon should be considered. In this work, the polycarbosilane (PCS) was uniformly adhered to the surface of graphene nanoplatelets (GNPs) by the sol–gel method, and SiC barrier formed after pyrolysis. The structural evolution of GNPs in reaction sintering and the chemical structure of GNPs-PCS were investigated. The results showed that GNPs after siliconizing showed a porous structure, consisting of nanometer SiC particles on the surface. The ceramic yield and final pyrolysis temperature of PCS were reduced after mixing with GNPs and divinylbenzene (DVB). The SiC formed by the pyrolysis of PCS was uniformly distributed among GNPs. SiC whiskers (SiC w ) were observed in the sample of GNPs and GNPs-PCS after siliconizing. The difference and formation mechanism of SiC w in these two samples were discussed. After PCS modification and pyrolysis, GNPs survived in the loss on ignition experiment. The prepared composite powder further improved the toughness of GNPs/RBSC by 14.69%.
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Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Guo-chang Song,Xing-yu Yang,Zhong-wei Li,Qiang Song
Arsenic (As) pollutants are highly toxic and using Ca-based minerals to adsorb As 2 O 3 is effective for emission control. In this study, a fixed-bed experimental system was used to study the adsorption of As 2 O 3 by the mixture of CaO, SiO 2 , and Al 2 O 3 at 1200 °C. The amount of As adsorbed by multiple minerals was higher than that by single minerals, indicating enhanced adsorption of As 2 O 3 under the coupling effects of Ca, Si, and Al. The adsorption amount of As first increased and then decreased with an increase in the CaO:(SiO 2 +Al 2 O 3 ) and SiO 2 :Al 2 O 3 ratios. Adsorbed As was mainly enriched in Ca-Si-Al mineral, including Ca 2 Al 2 SiO 7 . Density Functional Theory calculation was conducted to study the As 2 O 3 adsorption on the Ca 2 Al 2 SiO 7 (0 0 1) surface. The analysis of Mulliken charge and density of states showed that As 2 O 3 molecules formed Al-O, O-As, and Ca-O bonds with the Al, O, and Ca sites. Si and Al in Ca 2 Al 2 SiO 7 enhanced the adsorption ability of Ca sites by promoting electron transfer . Si/Al ratio close to 1:1 is conducive to the formation of Si-O-Al structures, thus further enhancing the adsorption. The results can help optimize coal blending strategies and modify adsorbents to further reduce As emissions during coal combustion .
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Small
·
2023
·Vol. 19
·期 33
·2302443
·
IF 13.3
Jianbo Wu,Xinyuan Zhang,Shihai You,Zeng-Kui Zhu,Tingting Zhu,Ziyang Wang,Ruiqing Li,Qianwen Guan,Lishan Liang,Xinyi Niu,Junhua Luo
Chiral perovskites have been demonstrated as promising candidates for direct circularly polarized light (CPL) detection due to their intrinsic chirality and excellent charge transport ability. However, chiral perovskite-based CPL detectors with both high distinguishability of left- and right-handed optical signals and low detection limit remain unexplored. Here, a heterostructure, (R-MPA) 2 MAPb 2 I 7 /Si (MPA = methylphenethylamine, MA = methylammonium) is constructed, to achieve high-sensitive and low-limit CPL detection. The heterostructures with high crystalline quality and sharp interface exhibit a strong built-in electric field and a suppressed dark current, not only improving the separation and transport of the photogenerated carriers but also laying a foundation for weak CPL signals detection. Consequently, the heterostructure-based CPL detector obtains a high anisotropy factor up to 0.34 with a remarkably low CPL detection limit of 890 nW cm −2 under the self-driven mode. As a pioneering study, this work paves the way for designing high-sensitive CPL detectors that simultaneously have great distinguishing capability and low detection limit of CPL.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Siqi Huang,Yong Zhang,Bingyu Mei,Xiaoyu Tian,Wenkun Zhu,Jun Liao,Nan Sun
The mesoporous Si-Fe-GO composite was prepared by sol–gel method to remove uranium. In the static adsorption process, the Si-Fe-GO composite possessed strong uranium-chelating ability with fast uranium adsorption kinetic (120 min) and high uranium adsorption capacity (576.4 mg/g). The adsorption behavior perfectly followed the pseudo-second-order kinetic and Langmuir isotherm models, revealing the nature of monolayer chemical adsorption. The tolerance experiments of coexisting ions showed that the Si-Fe-GO composite possessed a strong affinity for uranium, which was beneficial for the enrichment of uranium in a multi-component wastewater system. The good regeneration ability also reflected the practical application value of the Si-Fe-GO composite. Besides, the dynamic adsorption studies showed that the Si-Fe-GO composite might be suitable for the remediation of uranium-containing wastewater with low flow rate and low uranium concentration. In conclusion, this work would contribute to the development of functional SiO 2 materials for water remediation and meet the practical requirements for the cleanup of uranium from wastewater.
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JOURNAL OF POWER SOURCES
·
2021
·
IF 9.127
Linze Lv,Yan Wang,Weibo Huang,Yueyue Wang,Zhang Cao,Yuchen Li,Qiang Shi,Honghe Zheng
The commercialization of silicon (Si) anodes is sluggish due to the poor electrochemical performance of Si-based full cells (FCs). In order to break this limitation, this work investigates the effect of cathode type on the electrochemical performance of Si-based FCs and its mechanism. Based on electrochemical and spectral characterization , NCM523 is more suitable for assembling Si-based FCs to achieve high-rate and long-cycle. This is mainly because that the cathode type has an impact on the distribution of electrolyte decomposition products, while NCM523 is beneficial to the formation of more conductive organic components in the Si anode, and more LiF in the FC that can prevent electrolyte erosion. This work contributes to a basic comprehension of the electrochemical performance and SEI formation of Si-based FCs, and the results are helpful to the development and application of Si anodes.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2014
·
IF 2.726
Dong Yan,Ying Bai,Caiyan Yu,Xiaoge Li,Weifeng Zhang
Nanoscaled Si is successfully wrapped with different contents of nano-TiO 2 (the molar ratios of Si/TiO 2 composites are 1:1, 1:2, 1:3, 1:4 and 1:5, respectively) to form a novel pineapple structure. X-ray diffraction (XRD), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), field emission scanning electron microscopy (FESEM) and high resolution transmission electron microscopy (HRTEM) are utilized to characterize the structure, component, chemical environment and morphology of the composite. The investigation in cycling performances demonstrates that Si/TiO 2 with molar ratio of 1:4 exhibits the best cycling stability, with specific capacity of 593 mA h g − 1 after 50 cycles at 0.1 C, much higher than those of the other composites and the pristine material. Cyclic voltammetry (CV) profiles are also measured and compared. It is believed that the outside TiO 2 particles act as buffer against the huge volume change of Si during repeated alloying and de-alloying, which explains the improved electrochemical performances.
研究领域:
材料科学
·
能源存储
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DOI
高影响因子
BIOSENSORS & BIOELECTRONICS
·
2016
·
IF 7.476
Yong-Ping Dong,Jiao Wang,Ying Peng,Jun-Jie Zhu
Electrogenerated chemiluminescence (ECL) of semiconductor quantum dots (QDs) has been considered as a powerful technique in the fabrication of biosensor, however, high-toxicity of heavy metal ion containing in QDs severely limits their further applications, and the search for the alternative benign nanomaterials with high ECL efficiency is urgent. Herein, ECL behavior of eco-friendly silicon quantum dots (SiQDs) was reported in neutral aqueous condition. Stable and intense cathodic ECL emission was obtained in phosphate buffer solution (PBS) with K 2 S 2 O 8 as coreactant. ECL resonance energy transfer (ECL-RET) system was established with SiQDs ECL as energy donor and gold nanoparticles (AuNPs) as energy acceptor, based on which a novel ECL biosensor was fabricated. AuNPs was connected at the terminal of hairpin DNA to form a signal probe . When the probe was modified on SiQDs, ECL-RET occurred due to the short distance between AuNPs and SiQDs, resulting in the apparent decrease of ECL signal. Target DNA can open the loop of hairpin DNA, and move AuNPs away from the electrode surface . As a result, the ECL-RET process was hampered, and the ECL emission resumed. The increased ECL signals varied linearly with the target DNA concentrations in the range of 0.1 fM to 1 pM with the detection limit of 0.016 fM (3σ). The proposed ECL sensor exhibited highly sensitivity and good selectivity in the detection of target DNA.
研究领域:
分析化学
·
生物传感
·
纳米技术
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PubMed
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 76
·62024-62032
·
IF 3.84
Qian Feng,Dongyan Tang,Haitao Lv,Weile Zhang,Wenbo Li
Well fabricated ZnO nanorods (ZnO NRs) arrays with preferred-orientation that grown on pre-deposited ZnO seed layers substrate were selected to graft thermo-responsive polymers of poly(N-isopropylacrylamide) (PNIPAM) by surface-initiated atom transfer radical polymerization (SI-ATRP). As a controlled/“living” radical polymerization, SI-ATRP could endow the systems with the characteristics of the grafted PNIPAM, meanwhile, with the maintaining of the properties of the ZnO NRs. The structures of ZnO and the grafted polymer with the relatively high molecular weights (Mn, 24 300) and narrow molecular weight distributions (Mw/Mn, 1.19) that determined by GPC detection, were characterized by XRD and FT-IR. The graft amount of PNIPAM on ZnO NRs and the interactions between the two components were determined by TG and XPS, respectively. The relatively thin layers of PNIPAM (∼15 nm) formed around NRs via SI-ATRP method were observed by SEM. And the temperature-sensitivity of the grafted nanorods were proved by contact angles measurements. Furthermore, photodegradation of Rhodamine B (Rh-B) by the grafted nanorods revealed that ZnO NRs–PNIPAM exhibited photocatalysis and temperature responsibility characteristics, indicating the significant potential applications with tunable responsiveness by changing the environmental conditions.
研究领域:
材料科学
·
高分子化学
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高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2016
·Vol. 26
·期 9
·1400-1410
·
IF 11.382
Tao Ji,Qian Liu,Rujia Zou,Yangang Sun,Kaibing Xu,Liwen Sang,Meiyong Liao,Yasuo Koide,Li Yu,Junqing Hu
A multicolor photodetector based on the heterojunction of n-Si(111)/TiO 2 nanorod arrays responding to both ultraviolet (UV) and visible light is developed by utilizing interface engineering. The photodetector is fabricated via a consecutive process including chemical etching, magnetron sputtering, hydrothermal growth, and assembling. Under a small reverse bias (from 0 to ≈−2 V), only the photogenerated electrons in TiO 2 are possible to tunnel through the low barrier of Δ E C , and the device only responses to UV light; as the reverse bias increases, the photogenerated holes in Si also begin to tunnel through the high barrier of Δ E V . As a result, the device is demonstrated to have the capacity to detect both UV and visible lights, which is useful in the fields of rapid detection and multicolor imaging. It has been also observed that the crystal orientation of Si affects the characteristics of bias-controlled spectral response of the n-Si/TiO 2 heterojunctions.
研究领域:
材料科学
·
光学工程
·
半导体器件
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高影响因子
危险品化学品经营许可证（带存储）