ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Heli Yu,Mingzhu Bi,Cuijuan Zhang,Tianjie Zhang,Xiaoning Zhang,Hongtao Liu,Jianli Mi,Xiangqian Shen,Shanshan Yao
Construction of high sulfur loading electrode is one of the effective ways to achieve high specific energy density lithium/sulfur batteries. Therefore, the optimization of polymeric binders has been considered as effective strategy to improve the volume changes of sulfur electrodes during charge/discharge processes. In this work, an effective route for the preparation of three dimensional polymeric binder (PAA-PANI) via multiple hydrogen bonds was developed and fabricated through in situ polymerization between polyacrylic acid (PAA) and polyaniline (PANI), which possess bifunctional effects on high sulfur loading cathodes in lithium/sulfur batteries. The carboxyl polar groups of PAA could effectively adsorb polysulfides and the conductive PANI enhance the electronic conductivity of the sulfur electrode. The three dimensional polymeric binder of PAA-PANI has enhanced the active material adhesion, mechanical properties and electronic conductivity, which decreased overpotential polarization, improved the lithium ions diffusion coefficient, and reduced the self-discharge. More importantly, the PAA-PANI functional binder could alleviate the expansion of high sulfur loading electrode. Taking advantages of PAA-PANI binder, the carbon nanotubes modified sulfur electrode (CNTs@S; sulfur content: 84.3 wt%) with PAA-PANI binder exhibits an initial discharge capacity of 906 mAh g –1 at 2.56 mA cm –2 (0.3 C) under a sulfur loading of 5.1 mg cm –2 . Even at higher current density of 8.54 mA cm –2 (1 C), the PAA-PANI binder electrode delivers a high capacity of 846 mAh g –1 . Moreover, with an extremely high areal sulfur loading of 17 mg cm –2 , the cathode shows an areal specific capacity of 16.7 mAh cm –2 .
研究领域:
电化学
·
能源材料
·
高能电池
·
功能高分子
·
界面化学
·
储能技术
✓ 已验证
DOI
高影响因子
Small
·
2020
·Vol. 16
·期 38
·2003557
·
IF 11.459
Zheng Liu,Su Zhang,Zhipeng Qiu,Chao Huangfu,Lin Wang,Tong Wei,Zhuangjun Fan
Tin (Sn) is considered to be an ideal candidate for the anode of sodium ion batteries. However, the design of Sn-based electrodes with maintained long-term stability still remains challenging due to their huge volume expansion (≈420%) and easy pulverization during cycling. Herein, a facile and versatile strategy for the synthesis of nitrogen-doped graphene quantum dot (GQD) edge-anchored Sn nanodots as the pillars into reduced graphene oxide blocks (NGQD/Sn-NG) for ultrafast and ultrastable sodium-ion storage is reported. Sn nanodots (2–5 nm) anchored at the edges of “octopus-like” GQDs via covalent Sn O C/Sn N C bonds function as the pillars that ensure fast Na-ion/electron transport across the graphene blocks. Moreover, the chemical and spatial (layered structure) confinements not only suppress Sn aggregation, but also function as physical barriers for buffering volume change upon sodiation/desodiation. Consequently, the NGQD/Sn-NG with high structural stability exhibits excellent rate performance (555 mAh g −1 at 0.1 A g −1 and 198 mAh g −1 at 10 A g −1 ) and ultra-long cycling stability (184 mAh g −1 remaining even after 2000 cycles at 5 A g −1 ). The confinement-induced synthesis together with remarkable electrochemical performances should shed light on the practical application of highly attractive tin-based anodes for next generation rechargeable sodium batteries.
研究领域:
材料科学
·
电化学
·
纳米能源
·
储能材料
·
先进电池技术
✓ 已验证
DOI
高影响因子
FUEL
·
2017
·
IF 4.601
Junliang Wang,Shuyan Zhou,Ke Bei,I-Ming Chou,Chunmian Lin,Zhiyan Pan
This work developed a new method for measuring the volume expansion of a CO 2 + n -dodecane mixture, using a fused silica capillary cell (FSCC), combined with a heating-cooling stage and a confocal Raman spectrometer. The cell was constructed on the micron scale to reduce the temperature gradient and reagent consumption. The results confirmed the feasibility of this method that using Raman spectra to verify phase equilibrium, a digital camera to record images of the CO 2 + n -dodecane mixture and a micrometer to measure the volume, a section of water (water seal) between n -dodecane and gas phase to prevent n -dodecane from evaporating. It was shown that the volume expansion factor of the mixture increased with pressure going from 1.0 to 10.0 MPa, but decreased as the temperature was raised from 30 to 80 °C. In addition, a positive quadratic relationship ( R 2 > 0.99) was obtained between Raman peak intensity ratio and volume expansion factor, such that more volume expansion factors could be obtained according to the equations with measured Raman peak intensity ratio data. This experiment widens the ranges of temperature and pressure in the measurements of the volume expansion, and provides more volume expansion data for CO 2 -enhanced oil recovery.
研究领域:
物理化学
·
能源科学
·
油气开采
·
光谱分析
·
热力学
✓ 已验证
DOI
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2016
·
IF 3.12
Huali Xie,Xuejun Lai,Hongqiang Li,Xingrong Zeng
Fabricating an effective synergism between the condensed phase (char-forming) and the gas phase (free-radical quenching) is recently considered to be a very promising way to prepare high-efficient intumescent flame retardants . In this work, a novel hindered amine phosphorous-nitrogen macromolecular charring agent (HAPN) with free-radical quenching capability was synthesized and characterized. Then it was combined with ammonium polyphosphate (APP) to flame-retard polypropylene (PP). The flame retardancy and thermal stability of PP/HAPN/APP mixtures were investigated by limiting oxygen index (LOI), vertical burning test (UL-94), cone calorimetric test (CCT) and thermogravimetric analysis (TGA). When the content of HAPN/APP was 25 wt%, PP/HAPN/APP could self-extinguish at 36 s after igniting in the oxygen concentration of 29.5% and achieve a UL-94 V-0 rating. Meanwhile, the peak heat release rate (PHRR), total heat release rate (THR), average heat release rate (AV-HRR) and average mass loss rate (AV-MLR) were significantly decreased. The flame retardant mechanism of HAPN/APP was explored and the results revealed that there was an effective synergism between the condensed phase and the gas phase during the combustion. In the condensed phase, HAPN could make PP involve into the char-forming reaction to promote the formation of compact and firm intumescent char layer. Simultaneously, the nitroxyl radical generated by HAPN could effectively restrain and even extinguish the flame in the gas phase by quenching the active free-radicals.
研究领域:
高分子化学
·
材料科学
·
阻燃材料
·
热稳定性
·
燃烧性能
✓ 已验证
DOI
高影响因子
Laser & Photonics Reviews
·
2024
·Vol. 18
·期 11
·2400151
·
IF 9.8
Jiaoyin Zhao,Jiwen Chang,Nan Wang,Peihang Zhao,Mengyuan Zhu,Ying Liu,Dongxu Guo,Yu Wang,Panlai Li,Zhijun Wang,Hao Suo
Thermal quenching of luminescence materials poses a major obstacle to the technological application of luminescence thermometry. It still remains challenging to attain thermally enhanced light emissions, especially in the second near-infrared window (NIR-II). Herein, an anomalous thermal dependence of NIR-II luminescence in the negative thermal expansion (NTE) Sc 2 Mo 3 O 12 :Er 3+ /Ho 3+ nanocrystals is reported. Mechanistic investigations affirm that Ho 3+ ion can work as an energy reservoir and back-transfer to Er 3+ ion with the assistance of lattice phonon at elevated temperatures. Moreover, the Ho 3+ -mediated energy feedback is strengthened by the thermal contraction between dopant ions, thereby enabling a remarkable thermal enhancement of NIR-II emission over 11-fold. The opposite thermal response of Er 3+ and Ho 3+ emissions is harnessed for NIR-II ratiometric thermometry, registering exceptional performance in a high-temperature regime ( S r = 1.71% K −1 , δT = 0.2 K at 513 K). These findings may inspire new insights for addressing the thermal quenching of NIR-II luminescence, which also raises exciting opportunities for flexible thermometry in complex settings.
研究领域:
材料科学
·
光学材料
·
纳米科技
·
生物医学工程
·
分子成像
·
温度传感
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·Vol. 47
·期 23
·32641-32647
·
IF 4.527
Wei Liao,Yongqiang Tan,Chaowen Zhu,Zhen Teng,Peng Jia,Haibin Zhang
Multi-components and equimolar rare earth monosilicates, (Y 1/3 Dy 1/3 Er 1/3 ) 2 SiO 5 , (Y 1/3 Dy 1/3 Lu 1/3 ) 2 SiO 5 , (Y 1/4 Dy 1/4 Ho 1/4 Er 1/4 ) 2 SiO 5 and (Yb 1/4 Dy 1/4 Ho 1/4 Er 1/4 ) 2 SiO 5 , were prepared by solid-state reactions and the following hot-pressing. Dense microstructures with uniform elemental distributions were obtained for all samples. These investigated multi-components monosilicates exhibit low thermal conductivities and similar coefficients of thermal expansion with SiC. Moreover, they exhibit high corrosion resistances in 1400 °C water vapor , especially, four-components (Y 1/4 Dy 1/4 Ho 1/4 Er 1/4 ) 2 SiO 5 and (Yb 1/4 Dy 1/4 Ho 1/4 Er 1/4 ) 2 SiO 5 experienced almost invariable weights after small weight losses during the initial 0.5 h. All those results indicate that multi-components rare earth monosilicates are promising candidates of environmental barrier coatings for SiC/SiC composites.
研究领域:
材料科学
·
无机非金属材料
·
高温防护涂层
·
陶瓷基复合材料
·
表面工程
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2016
·Vol. 41
·期 22
·9611-9618
·
IF 3.205
Jinhua Xiao,Wenying Zhang,Chunyan Xiong,Bo Chi,Jian Pu,Li Jian
Spinel oxides with the general formula of MnCu x Co 2−x O 4 (x = 0.1, 0.3, 0.5, 0.7 respectively) are used as coating materials on the metallic interconnect SUS 430 alloy to reduce the cathodic performance degradation by Cr poisoning and the interfacial resistance to improve the surface stability. The effect of Cu doping at the B position of spinel on the electrical conductivity and coefficient of temperature expansion (CTE) is investigated to determine the oxidation behavior and effectiveness as a protective layer. The result confirms that MnCu 0.5 Co 1.5 O 4 spinel shows highest electrical conductivity of 105.46 S cm −1 at 750 °C in air and an average CTE value of 12.27 × 10 −6 K −1 at temperature range of 20–960 °C. MnCu 0.5 Co 1.5 O 4 coating is stable enough after 2000 h cyclic oxidation at 750 °C. The growth of Cr 2 O 3 and formation of MnCr 2 O 4 in the scale layer are effectively suppressed by the presence of MnCu 0.5 Co 1.5 O 4 coating. The oxidation kinetics obeys the parabolic law with a rate constant as low as 2.76 × 10 −15 g 2 cm −4 ·s −1 and the ASR contributed by the oxide scale is 8.04 mΩ cm 2 at 750 °C. The research indicates that MnCu 0.5 Co 1.5 O 4 is a promising coating material for metallic interconnects of the intermediate temperature solid oxide fuel cells .
研究领域:
材料科学
·
能源材料
·
固体氧化物燃料电池
·
表面工程
·
电化学
·
高温腐蚀
·
功能涂层
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Chunru Li,He Song,Changming Mao,Hongrui Peng,Guicun Li
Antimony (Sb) is an attractive anode material for lithium-ion batteries with high theoretical capacity. However, its practical application is greatly hindered by the rapid capacity fading due to the large volume expansion during lithiation. Tuning the morphology of active materials at the nanoscale or designing reasonable components is essential to address this issue. Employing an antimony sulfide nanorod as semi-sacrificial template, here, we successfully synthesize one-dimensional MoS 2 sheets-decorated Sb@Sb 2 S 3 @C(MoS 2 -Sb@Sb 2 S 3 @C) nano-structure via facile thermal carbonization of Mo-polypyrrole complex coating film. During annealing, metallic Sb from the partial reduction of Sb 2 S 3 nanorods is embedded into amorphous carbon nanotubes that are derived from polypyrrole and simultaneously MoS 2 nanosheets forms on the surface of Sb-Sb 2 S 3 -C nanostructures. This unique hierarchical tubular composite not only can serve as robust skeleton frameworks for accommodating volume changes of metallic Sb and Sb 2 S 3 during cell cycling, but also are characterized by high electronic conductivity (because of the amorphous carbon nanotubes and metallic Sb) and abundant active sites, both of which are beneficial for the improvement of Li-ion storage properties. As expected, the MoS 2 -Sb@Sb 2 S 3 @C composite exhibit a high specific capacity (1596 mAh g −1 at 0.1 A g −1 ), high rate capability (481 mAh g −1 at 5 A g −1 and 355 mAh g −1 at 8 A g −1 ), and stable cycling performance (760 mAh g −1 maintained after 100 cycles at 1 A g −1 ). Our work potentially sheds some light on future development of alloy-type anodes for battery applications.
研究领域:
材料科学
·
电化学
·
纳米科技
·
能源存储
·
电池技术
✓ 已验证
DOI
高影响因子
Nano Energy
·
2020
·
IF 16.602
Long Li,Chun Fang,Wenfei Wei,Lei Zhang,Zhao Ye,Gang He,Yunhui Huang
The huge volume change of silicon anode during cycling results in unstable solid electrolyte interface (SEI), causing rapid performance degradation . Natural SEI layer has a heterogeneous structure, results in the inhomogeneous Li + diffusion. The repeated destruction and regeneration of SEI aggravate the inhomogeneity of Li + diffusion at the interface, leading to non-uniform alloy reaction in the Si bulk. In this work, the silicon surface is passivated by an ultrathin uniform chitosan layer with abundant lithiophilic groups. The capacity of chitosan-coated Si (Si@CS) could reach 1500 mAh g −1 at a current density of 1 A g −1 , and the capacity retention remains 91% after 400 cycles. It is demonstrated that the oxygen and nitrogen atoms in chitosan are coordinated with Li + , providing uniformly distributed Li + transfer sites, results in a homogeneous Li + flux in the surface layer. Interestingly, a nano-scale ordered atomic arrangement is observed in the delithiated Si@CS, which contributes to more stable and reversible lithiation/delithiation reaction of the Si@CS electrode. It is proposed that optimizing the reaction interface on the Si surface is able to alter the Li-ion diffusion kinetics and structure transition behavior of silicon, which can improve the structure reversibility and stability during cycling.
研究领域:
材料科学
·
电化学
·
纳米科技
·
能源存储
·
表面工程
·
锂离子电池
✓ 已验证
DOI
高影响因子
MATERIALS LETTERS
·
2014
·
IF 2.269
Yaguang Yuan,Yanping Yuan,Nan Zhang,Yanxia Du,Xiaoling Cao
Capric–myristic–palmitic acid ternary eutectic mixture (CA–MA–PA) was prepared as phase change material (PCM). A novel composite PCM of CA–MA–PA/expanded graphite (EG) with an optimum mass ratio (CA–MA–PA:EG=13:1) was prepared by uniformly absorbing CA–MA–PA into the porous network structure of the EG. The melting and freezing temperatures of CA–MA–PA/EG composite PCM were measured by differential scanning calorimeter as 18.61 °C and 16.58 °C, respectively, while the melting and freezing latent heats were 128.2 J/g and 124.5 J/g, respectively. The thermal conductivity of the CA–MA–PA/EG composite PCM was measured as 3.67 W/m K and thus the thermal storage and release rates were significantly increased. The thermal cycling test results showed that CA–MA–PA/EG composite PCM has a good thermal reliability. All the above results show that the CA–MA–PA/EG composite PCM is a potential solution for latent heat storage system.
研究领域:
材料科学
·
能源化学
·
热物理
·
功能材料
·
储能技术
✓ 已验证
DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2018
·
IF 4.514
Yuxin He,Qiuyu Chen,Song Yang,Chang Lu,Mengting Feng,Yuanli Jiang,Guoxi Cao,Jianping Zhang,Chuntai Liu
The epoxy nanocomposites with Fe 3 O 4 modified graphene oxide (Fe 3 O 4 /GO) were used to influence the micro-cracks resistance of carbon fiber reinforced epoxy (CF/EP) laminate at 77 K. Fe 3 O 4 /GO with good paramagnetic properties were prepared by co-precipitation method and used to modify epoxy for cryogenic applications. Fe 3 O 4 /GO modified CF/EP laminates were also prepared through vacuum-assisted resin transfer molding (VARTM). The results show that the Fe 3 O 4 /GO can effectively improve the mechanical properties of epoxy (EP) matrix at 77 K and reduce the coefficient of thermal expansion (CTE) of EP matrix. It also can obviously improve the micro-cracks resistance of CF/EP composites at 77 K. Compared to neat EP, the CTE of Fe 3 O 4 /GO modified EP composite is decreased 51.6%. Compared to CF/EP composite, the micro-cracks density of Fe 3 O 4 /GO modified CF/EP composite at 77 K is decreased 60.0%.
研究领域:
材料科学
·
高分子复合材料
·
低温工程
·
纳米复合材料
·
力学性能
✓ 已验证
DOI
高影响因子
IONICS
·
2022
·Vol. 29
·期 2
·505-518
·
IF 2.961
Yang Dongping,Xiong Deping,Feng Zuyong,Wen Kunhua,Wu Kaidan,He Miao,Feng Yefeng
Sn-based materials receive a lot of attention because of their high theoretical specific capacity, acceptable price, and good electrical conductivity. However, Sn-based materials have a large volume expansion in the circulation process, leading to the rapid decay of capacity. According to the ion diffusion time formula: t = L2/2D, where L is the diffusion length or the particle size, and D is the diffusion constant of the ions and the electrons. It can be seen that reducing the particle size can significantly improve the multiplier performance of the material. At present, the main methods for preparing nano-sized metal/carbon composites are the high-energy ball grinding method, hydrothermal method, calcined metal, and organic matter precursor. In this paper, sodium alginate was used as a precursor system for the Fe-doped Sn @3D carbon composite material, which was applied to the lithium-ion battery anode to obtain excellent electrochemical performance (1133.5 mAhg −1 after 200 cycles at 0.2 Ag −1 ). The increase in the specific surface area of Fe-doped Sn @3D carbon also increases the charge transfer efficiency and further improves the multiplier performance of the electrode. Meanwhile, the nano-size and structure can better buffer the volume expansion and protect the structure of the electrode.
研究领域:
材料科学
·
电化学
·
纳米材料
·
能源存储
·
功能材料
·
复合材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）