Food Additives and Contaminants Part A-Chemistry Analysis Control Exposure & Risk Assessment
·
2018
·
IF 2.129
Chongxing Huang,Yuan Zhao,Hongxia Su,Ronghua Bei
As novel materials for food contact packaging, inorganic silicon oxide (SiOx) films are high barrier property materials that have been developed rapidly and have attracted the attention of many manufacturers. For the safe use of SiOx films for food packaging it is vital to study the interaction between SiOx layers and food contaminants, as well as the function of a SiOx barrier layer in antioxidant migration resistance. In this study, we deposited a SiOx layer on polylactic acid (PLA)-based films to prepare SiOx/PLA coated films by plasma-enhanced chemical vapour deposition. Additionally, we compared PLA-based films and SiOx/PLA coated films in terms of the migration of different antioxidants (e.g. t-butylhydroquinone [TBHQ], butylated hydroxyanisole [BHA], and butylated hydroxytoluene [BHT]) via specific migration experiments and then investigated the effects of a SiOx layer on antioxidant migration under different conditions. The results indicate that antioxidant migration from SiOx/PLA coated films is similar to that for PLA-based films: with increase of temperature, decrease of food simulant polarity, and increase of single-sided contact time, the antioxidant migration rate and amount in SiOx/PLA coated films increase. The SiOx barrier layer significantly reduced the amount of migration of antioxidants with small and similar molecular weights and similar physical and chemical properties, while the degree of migration blocking was not significantly different among the studied antioxidants. However, the migration was affected by temperature and food simulant. Depending on the food simulants considered, the migration amount in SiOx/PLA coated films was reduced compared with that in PLA-based films by 42–46%, 44–47%, and 44–46% for TBHQ, BHA, and BHT, respectively.
研究领域:
材料科学
·
食品安全
·
包装工程
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2021
·
IF 9.127
Wenwen Li,Hongyan Wang,Zhe Sun,Quanping Wu,Song Xue
Cuprous oxide (Cu 2 O) is an attractive photo-electrocatalyst for sustainable hydrogen production . The main issues limiting the use of Cu 2 O as a photocathode are the severe electron-hole recombination and photo-corrosion in aqueous electrolyte . Herein, to address the above issues, amorphous SiO x overlayers have been deposited on the surface of Cu 2 O as a protective cover using a facile dip-coating method. The overall PEC performances have been greatly improved, as evidenced by the increased photocurrent density (3.1 times of bare Cu 2 O) and improved stability (3.8 times of bare Cu 2 O). The structure and PEC characterizations prove that Si has been gradient-doped into the Cu 2 O, leading to a downward band bending from the bulk to the surface region, which promotes the charge separation and transfer efficiently. In addition, the amorphous SiOx layers serve as protection layers and prevent the Cu 2 O from direct contact with the electrolyte, maintaining a high photocurrent density over the stability test. Decoration with Pt catalyst has further boosted the photocurrent density to be 2.8 mA cm −2 at 0 V vs. RHE with better stability, indicating the synergistic effect of SiOx layer and Pt catalyst This work provides a facile strategy to improve the PEC activity and stability of Cu 2 O, which may be extended to other systems with photo-corrosion problems, such as BiVO 4 or ZnO.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Ting Zhu,Junnan Han,Teng Sun,Jiaming Chen,Sheng Wang,Siyun Ren,Xiaodong Pi,Jun Xu,Kunji Chen
Developing a bifunctional electrocatalyst with remarkable performance viable for overall water splitting is increasingly essential for industrial-scale renewable energy conversion. However, the current electrocatalyst still requires a large cell voltage to drive water splitting due to the unsuitable adsorption/desorption capacity of reaction intermediates, which seriously hinders the practical application of water splitting. Herein, a unique SiOx/Ru nanosheet (NS) material was proposed as a high-performance electrocatalyst for overall water splitting. The SiOx/Ru NSs show superior performance in the hydrogen evolution reaction with a low overpotential of 23 mV (@ 10 mA cm–2) and excellent stability for nearly 200 h (@ 10 mA cm–2) in 1 M KOH. By means of the introduction of SiOx, it is beneficial for balancing the local charge density of the surrounding Ru sites. The suitable electronic coupling between the d-band electrons of Ru and the adsorbed species effectively balances the adsorption and desorption of reaction intermediates on the surface. As a result, the catalyst also exhibits overall water splitting activity with a cell voltage of only 1.496 V to reach the current density of 10 mA cm–2. The present work opens up a new strategy for designing high-performance electrocatalysts for water splitting.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Yu Jing,Guangchao Li,Zhixing Wang,Xinhai Li,Wenjie Peng,Huajun Guo,Hui Duan,Guochun Yan,Jiexi Wang
Silicon (Si) is considered as one of the most promising candidates for next-generation lithium-ion batteries with high energy density. The main problems are the severe volume expansion and continuous interfacial side reaction of Si that hinder its further application. It can be an effective way by constructing a robust coating layer outside of Si to impede/alleviate the above effect. SiOx with high mechanical strength can largely promote the electrochemical performance of Si. Herein, Si@SiOx material with high specific surface area, high porosity, and controllable coating was synthesized via a simple solid–liquid reaction by LiOH solution etching effect. The etching/oxidation mechanism of Si under alkaline conditions was thoroughly investigated. The surface oxide layer of Si was beneficial to the formation of a solid electrolyte interphase (SEI) with excellent stability and high Li+ conductivity, while its high-porosity structure reduces the volume expansion of the material by approximately 110%. Under the synergistic effect of etching-oxidation, the modified material exhibited superior electrochemical properties. When employed as anode materials, the specific capacity was as high as 3101.5 mAh g–1 and maintained at 841.0 mAh g–1 after 500 cycles at 1 A g–1.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Pengfei Li,Xu Ma,Guifen Gong,Caihong Xu,Zongbo Zhang
AgNW networks show high promise as a conductive material due to excellent flexibility, low resistance, high transparency, and ease of large-scale preparation. However, the application of AgNW networks has been hindered by their inherent characteristics, such as easy oxidation degradation, chemical corrosion, and structural instability at high temperatures. In this study, a dense SiOx protective layer derived from perhydropolysilazane was introduced to fabricate a robust SiOx/AgNW nanocomposite coating through an all-solution process at room temperature. The achieved nanocomposite coating shows outstanding thermal stability up to 450 °C, resistance to ultraviolet radiation, and excellent mechanical performance by maintaining stability after 10,000 cycles of bending at a radius of 2.5 mm, 1000 cycles of peeling, and 1200 cycles of wearing. Meanwhile, the nanocomposite coating demonstrates exceptional chemical tolerance against HCl, Na2S, and organic solvents. A transparent heater based on the nanocomposite coating achieves a remarkable benchmark with a maximum temperature of 400 °C at 20 V. These features highlight the potential of the nanocomposite coating in flexible electronics, optoelectronics, touch screens, and high-performance heaters.
研究领域:
材料科学
·
纳米技术
·
电子工程
✓ 已验证
DOI
PubMed
高影响因子
Journal of Energy Storage
·
2023
·
IF 9.4
Haidong Xie,Chunping Hou,Yuqing Qu,Hui Tian,Hui Lu,Jiandong Wu,Shaolin Yang,Yong Ma
SiO x has become one of the most promising anode materials for lithium ion batteries due to its high specific capacity, abundant natural resources and suitable lithium insertion and extraction voltage. However, the low conductivity and the poor cycle performance seriously hinder its practical application. In here, a simple and effective method is proposed to disperse SiO x between carbon materials including flake graphite, reduced graphene oxide (rGO) and carbon nanotubes (CNTs), and then micron-sized N-SiO x /graphite/rGO-CNTs@C (N-SiO x /C@C) composite with dense structure is prepared by coating and pyrolysis of pitch. The synergistic effect of various carbon materials is beneficial to improve the conductivity of the material, and maintain the structural integrity during the cycle. The obtained N-SiO x /C@C anode exhibits high reversible capacity (980.2 mAh·g −1 ), excellent cycle stability (70 % capacity retention after 500 cycles at 0.5 A·g −1 ) and excellent rate performance (491.9 mAh·g −1 specific capacity of at 5 A·g −1 ). The strategy provided here effectively improves the electrochemical performances of SiO x , and the prepared materials show great application potential in the field of lithium ion batteries.
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
Journal of Energy Chemistry
·
2024
·
IF 14
Hao Wang,Chun Yang,Xiaoyan Yu,Mingrui Wang,Runze Yang,Xiaowa Nie,Ben Hang Yin,Alex C.K. Yip,Chunshan Song,Guanghui Zhang,Xinwen Guo
Indium oxide (In 2 O 3 ), as a promising candidate for CO 2 hydrogenation to C 1 products, often suffers from sintering and activity decline, closely related to the undesirable structural evolution under reaction conditions. Based on the comprehension of the dynamic evolution, this study presents an efficient strategy to alleviate the agglomeration of In 2 O 3 nanoparticles by the surface decoration with highly dispersed silica species (SiO x ). Various structural characterizations combined with density functional theory calculations demonstrated that the sintering resulted from the over-reduction, while the enhanced stability originated from the anchoring effect of highly stable In–OSi bonds, which hinders the substantial formation of metallic In (In 0 ) and the subsequent agglomeration. 0.6Si/In 2 O 3 exhibited CO 2 conversion rate of 10.0 mmol g −1 h −1 at steady state vs. 3.5 mmol g −1 h −1 on In 2 O 3 in CO 2 hydrogenation. Enhanced steady-state activity was also achieved on Pd-modified catalysts. Compared to the traditional Pd/In 2 O 3 catalyst, the methanol production rate of Pd catalyst supported on 0.6Si/In 2 O 3 was enhanced by 23%, showing the potential of In 2 O 3 modified by SiO x in serving as a platform material. This work provides a promising method to design new In 2 O 3 -based catalysts with improved activity and stability in CO 2 hydrogenation.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Hui Li,Jiao Peng,Zhenyu Wu,Xiaolin Liu,Peng Liu,Baobao Chang,Xianyou Wang
SiO x -based anode materials (0 < x < 2) have been regarded as an appealing candidate for anode material of commercial Lithium-ion batteries accounting for their ultrahigh theoretical capacity and low cost. However, its large-scale applications have been hampered by the serious volume expansion during repeated cycles, low intrinsic conductivity and unsatisfactory initial Coulombic efficiencies. Herein, to address these inherent deficiencies, a hierarchical SiO x -based anode with double-layer coatings of Sn inner layer and N-doped carbon outer shell is elaborately designed by a facile two-step hydrolysis process and polymer coating technology . Benefiting from the “synergistic effect” between Sn and SiO x at different working potentials and a well-designed double-layer coating structure, the resultant SiO x /C@Sn@NC anode displays excellent electrochemical properties, including an enhanced initial Coulomb efficiency (73.3%) efficiency, higher reversible capacity (991 mAh g −1 ) and superior long lifespan. Moreover, comprehensive characterization based on the reaction kinetics and structural stability proved that such enhanced ICE and cycling stability of anode material stem from its unique double-layer coating structure and multiple active components, which can significantly improve the diffusion of ion and charge transport, stabilize solid-electrolyte interphase (SEI) layer and absorb the expansion stress of electrode. Therefore, this study provides an efficient and feasible strategy to overcome the limitations of high-capacity SiO x -based anode materials via hybridization design with various active components and a double-layer coating strategy.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Dajin Liu,Zhilong Han,Jingqi Ma,Lingfeng Gao,Jie Cai,Lina Zhang,Shijie Cheng,Jia Xie
SiO x anodes hold great promise for next-generation lithium-ion batteries (LIBs) due to the high capacity and enhanced cycling stability versus silicon. However, its long-term development is hampered by seeking a scalable and effective method to tackle the issues of low conductivity and large volume expansion. Herein, a novel anode material is constructed by wrapping SiO x into PVA derived carbon layer and N-doped carbon (NC) nanosheets derived from exfoliated chitin nanosheets. The SiO x nanoparticles tightly encapsulated by the chitin nanosheets and PVA are transformed to robust SiO x @NC composites after pyrolysis. The encapsulation of PVA derived carbon layer and the NC sheets enhances the conductivity, relieves the volume change, and contributes to forming a stable SEI film. As a result, the prepared SiO x @NC-2 anode delivers a stable cycling performance and competitive rate capability. After 300 cycles at 0.5 A g −1 , a relatively high capacity of 602 mA h g −1 is maintained. The cost-effective precursors and facile synthetic route can promote the application of the SiO x @NC composites as anode materials in energy storage, as well as facilitating the large-scale application of the biowaste derived chitin.
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
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Tao Xu,Qian Wang,Jian Zhang,Xiaohua Xie,Baojia Xia
Designing hollow/porous structure is regarded as an effective approach to address the dramatic volumetric variation issue for Si-based anode materials in Li-ion batteries (LIBs). Pioneer studies mainly focused on acid/alkali etching to create hollow/porous structures, which are, however, highly corrosive and may lead to a complicated synthetic process. In this paper, a dual carbon conductive network-encapsulated hollow SiOx (DC-HSiOx) is fabricated through a green route, where polyacrylic acid is adopted as an eco-friendly soft template. Low electrical resistance and integrated electrode structure can be maintained during cycles because of the dual carbon conductive networks distributed both on the surface of single particles formed by amorphous carbon and among particles constructed by reduced graphene oxide. Importantly, the hollow space is reserved within SiOx spheres to accommodate the huge volumetric variation and shorten the transport pathway of Li+ ions. As a result, the DC-HSiOx composite delivers a large reversible capacity of 1113 mA h g–1 at 0.1 A g–1, an excellent cycling performance up to 300 cycles with a capacity retention of 92.5% at 0.5 A g–1, and a good rate capability. Furthermore, the DC-HSiOx//LiNi0.8Co0.1Mn0.1O2 full cell exhibits high energy density (419 W h kg–1) and superior cycling performance. These results render an opportunity for the unique DC-HSiOx composite as a potential anode material for use in high-performance LIBs.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 13
·6405-6411
·
IF 3.3
Xiaoming Zhou,Yang Liu,Liming Chen,Guohui Yuan
High-performance SiOx/C composites are currently one of the potential anodes for practical lithium-ion batteries. However, the dispersion of carbon in previous SiOx/C composites is usually uneven at the microscopic scale, where the anisotropic volume expansion generates continuous attenuation of coulombic efficiency in long-term cycling, resulting in a poor cycling performance. In the research reported here, the monodisperse SiOx/C spheres with a size of 200–1000 nm are prepared by a simple chemical polymerisation combined with high-temperature carbonisation. 3-Aminopropyltriethoxysilane and glutaraldehyde are selected as the silicon and carbon sources to form the spherical polymer by an aldimine condensation reaction. The organic carbon in the precursor is transformed in situ into amorphous carbon, which is uniformly located in the Si–O–Si framework at the ultrafine nanoscale. Because of the unique structural nature, the synthesised SiOx/C spheres demonstrate a long service lifespan together with a high coulombic efficiency. This work provides a practical design for reliable SiOx/C anodes.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2022
·Vol. 19
·期 1
·2204867
·
IF 15.153
Ning Zhang,Kun Liu,Haibai Zhang,Xiaofei Wang,Yuhao Zhou,Wenxiu He,Jinlong Cui,Juncai Sun
To break the stereotype that silica can only be reduced via a magnesiothermic and aluminothermic method at low-temperature condition, the novel strategy for converting silica to SiO x using disproportionation effect of SnO generated via low-temperature pyrolysis coreduction reaction between SnO 2 and rice husk is proposed, without any raw materials waste and environmental hazards. After the low-temperature pyrolysis reaction, SnO y @C/SiO x composites with unique structure (Sn/SnO 2 dispersed on the surface and within pores of biochar as well as SiO x residing in the interior) are obtained due to the exclusive biological properties of rice husk. Such unique structural features render SnO y @C/SiO x composites with an excellent talent for repairing the damaged structure and the highly electrochemical storage ability (530.8 mAh g −1 at 10 A g −1 after 7500 cycles). Furthermore, assembled LiFePO 4 ||SnO y -50@C/SiO x full cell displays a high discharge capacity of 463.7 mAh g −1 after 100 cycles at 0.2 A g −1 . The Li + transport mechanism is revealed by density functional theory calculations. This work provides references and ideas for green, efficient, and high-value to reduce SiO 2 , especially in biomass, which also avoids the waste of raw materials in the production process, and becomes an essential step in sustainable development.
研究领域:
材料科学
·
能源存储
·
绿色化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）