APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Hanwei Zhang,Xuri Wang,Ahmad Naveed,Tianyi Zeng,Xiaoyun Zhang,Hancheng Shi,Mingru Su,Aichun Dou,Yu Zhou,Yunjian Liu
Nickel-rich cathode materials are widely used for electronic devices because of their high capacity and rate performance. However, structural deterioration after long-term cycling leads to a significant decline in capacity and cycle life. In this work, the effects of three different cations doping on the structural stability and electrochemical performance of Ni-rich cathode materials were investigated. XRD characterization reveals that doped cation leads to broadening of the distance between Li layers and inhibiting Li + /Ni 2+ mixing arrangement. Compared with Na + and K + , the high valence Mg 2+ provides a stronger Mg-O bond, which can effectively restrain the undesired phase transition and sustain the ordered structure. Electrochemical tests demonstrate that NCA with Mg doping has better cycle stability and rate performance than Na and K. The capacity retention rate of NCA with 1% Mg doping is 87.7% after 200 cycles at 1C, and it can still provide a specific capacity of 146.8 mAh g −1 at a high rate of 5C.
研究领域:
材料科学
·
电化学
·
能源存储
·
无机化学
·
固态化学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Chen Zhang,Mingjun Chen,Xiaohui Zhao,Wenming Zhang,Zhanyu Li
With its consistent thermal runaway temperature and superior capacity, aluminum ion batteries have emerged as a key area for battery development. At the moment, electrode material is the main focus of aluminum ion battery capacity enhancement. Selenide is anticipated to develop into a high-performance cathode for aluminum ion batteries, since it is a type of high energy density electrode material. However, because selenide is soluble in acid electrolytes, Al-Se batteries have low cycle performance and cannot keep up with the present demand for electronic gadgets. Here, homogeneous-structured precursors were created via a hydrothermal reaction , and MnSe 2 –MnSe heterojunction hollow spheres were created a step further via temperature control of the selenidation reaction. With 103.76 mAh/g of specific capacity remaining after 3000 cycles at 1.0 A/g, this novel heterojunction material exhibits astounding cycle stability. After additional investigation, it was shown that the MnSe 2 –MnSe heterojunction may prevent the dispersion of the active substances, significantly enhancing the cycle performance. The density of states (DOS) of electrode materials demonstrates the superior electronic conductivity of this heterojunction material. Meanwhile, it was computationally demonstrated that the MnSe 2 –MnSe heterojunction has a strong adsorption energy for AlCl 4 − , thus accelerating the reaction kinetics. In summary, the performance of selenides has been improved by this novel heterojunction material, which also makes for a superior cathode material .
研究领域:
电化学
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材料科学
·
能源存储
·
纳米材料
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固态化学
·
电极材料
✓ 已验证
DOI
高影响因子
SURFACE ENGINEERING
·
2025
·
IF 2.6
Xiaobing Li,Ruijie Lu,Zhenping Wu,Jianfeng Chen
In this study, a multi-step synergistic process combining chemical etching, hydrothermal deposition and stearic acid modification was proposed for the corrosion protection needs of aluminium alloys in marine environments, and micro- and nano-composite superhydrophobic coatings (STZ) were successfully constructed on the surface of aluminium bases. Scanning electron microscopy, EDS, and XRD confirmed the presence of zinc oxide particles with micron-level rough structures on the coating surface. Contact angle testing showed a static contact angle of up to 156° and a rolling angle of less than 5°, which is consistent with superhydrophobic properties. Electrochemical tests showed that the corrosion current density of the STZ coating was three orders of magnitude lower than that of the untreated substrate, and the charge transfer resistance was significantly higher, confirming a significant increase in corrosion resistance. After 400 linear abrasion cycles, the coating retained 70% of its hydrophobic properties. In self-cleaning tests, the rate of contaminant adhesion was reduced by 75% compared to the untreated substrate.This process provides a feasible solution for the long-term protection of aluminium alloys in harsh environments.
研究领域:
材料科学
·
表面工程
·
腐蚀与防护
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纳米材料
·
功能涂层
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2022
·
IF 10.319
Wenqiang Hu,Wenbin Fu,Samik Jhulki,Liang Chen,Aashray Narla,Zhijian Sun,Fujia Wang,Alexandre Magasinski,Gleb Yushin
Poor heat/flame-resistance of polyolefin (e.g., polyethylene and polypropylene) separators and high flammability of organic electrolytes used in today's lithium-ion batteries (LIBs) may trigger rare yet potentially catastrophic safety issues. Here, we mitigate this challenge by developing a heat-resistant and flame-retardant porous composite membrane composed of polyetherimide (PEI) and Al 2 O 3 nanowires (NWs). The membranes are fabricated based on an industrially scalable non-solvent-induced phase separation process, which results in an intimately interconnected porous network of Al 2 O 3 NWs and PEI . The produced composite membranes exhibit excellent flexibility, thermal stability, and flame-retardancy. Importantly, the composite membranes exhibit minimal thermal shrinkage and superior tensile strength (16 MPa) at temperatures as high as 200 °C, significantly exceeding the performance of conventional polyolefin separators. Compared with commercial separators, their superior wettability and higher ionic conductivity (by up to 2.4 times) when filled with the same electrolyte, larger electrolyte uptake (∼190 wt.%), as well as improved cycle and rate performance demonstrated in LiNiMnCoO 2 (NCM)-based LIBs make them attractive choices for a variety of electrochemical energy storage devices.
研究领域:
材料科学
·
电化学
·
能源存储
·
高分子科学
·
纳米技术
✓ 已验证
DOI
高影响因子
CORROSION SCIENCE
·
2022
·
IF 7.72
Tianquan Liang,Zhihua Huang,Menghao Li,Wantong Xiao,Huan He,Aoping He,Xiyong Chen,Nengneng Luo
The thermochemical reaction behaviors between Y 2 O 3 and calcium-magnesium-aluminosilicate (CMAS) at 1250 °C∼1400 °C were investigated. A continuous-dense reaction layer mainly composed of Y-apatite phase quickly forms within 15 min, and its slow increasing thickness depends on the molten CMAS infiltration along the Y-apatite grain boundaries, the dissolution of the Y-apatite phase into the melt, the inhibiting effect on the CMAS penetration, and the reaction time and temperature. The CMAS crystallization occurs due to the change of chemical composition and the formation of other reaction products. The dense reaction layer shows good resistance to the molten CMAS infiltration.
研究领域:
材料科学
·
无机非金属材料
·
高温材料
·
陶瓷涂层
·
腐蚀与防护
✓ 已验证
DOI
高影响因子
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
·
2020
·
IF 4.652
Jianlong Chai,Yabin Zhu,Zhiguang Wang,Tielong Shen,Yiwen Liu,Lijuan Niu,Shufen Li,Cunfeng Yao,Minghuan Cui,Chao Liu
Al 2 O 3 –ZrO 2 (3Y)–SiC ceramic composites were prepared by spark plasma sintering in vacuum under 40 MPa of uniaxial compression between 1300 °C and 1400 °C. The effect of nano-size SiC and sintering temperature on the microstructure and mechanical properties of ceramic composites were investigated. The results showed that SiC particles was uniformly distributed in the composite, mainly within the matrix grains. Sintering temperature and SiC particles caused the shape of alumina grains to be columnar. The flexural strength of 22.3 vol% Al 2 O 3 -57.7 vol% ZrO 2 -20 vol% SiC sintered at 1350 °C composites was 1081 MPa, fracture toughness was 15.18 MPa m 1/2 and hardness was 16.42 GPa. The addition of SiC particles leads to grain boundary strengthening, and the change of fracture mode and cracks deflection and bridging are considered to be the main reasons for the increase in material fracture toughness.
研究领域:
材料科学
·
陶瓷学
·
复合材料
·
固态物理
·
结构材料
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Mengdi Yuan,Chao Xu,Tieying Wang,Tianying Zhang,Xinyu Pan,Feng Ye
The serious supercooling of erythritol (ET) limits its application in the field of mid-temperature thermal energy storage (TES), especially in the recently developed form-stable phase change materials (PCMs). The primary purpose of this paper is to find out the factors to mitigate the supercooling of ET/expanded graphite (EG) form-stable composite PCM and obtain the correlation among the morphology, kinetic parameters, and a supercooling degree in the non-isothermal crystallization process. Firstly, five types of supercooling relaxation agents (nano-Al 2 O 3 , nano-SiO 2 , CMC, urea, and citric acid) were added to prepare the ET/EG form-stable CPCMs. Among them, the ET/EG/nano-Al 2 O 3 exhibited excellent form-stable ability, a high heat release ratio of 78.9%, and the lowest supercooling degree (Δ T ) of 45.7 °C. Based on the chosen ET/EG/nano-Al 2 O 3 CPCM, the tablet pressures from 1 to 13 MPa were applied, obtaining lowest Δ T decreased by 59.0% in 1 MPa. Moreover, the non-isothermal crystallization processes were discussed on the ET/EG/nano-Al 2 O 3 with the Avrami equation modified by Jeziorny. ET tended to grow spherulites under the high cooling rate of 18 °C/min with triggering as the Johnson-Mehl-Avrami exponent n increased to 4.22. Meanwhile, the supercooling degree increased from 48.8 to 56 °C with the cooling rate growing from 2 to 18 °C/min. And the activity energy Δ E of the ET/EG/nano-Al 2 O 3 CPCM (7092.35 kJ/mol) was smaller than that of the ET/EG CPCM (8211.19 kJ/mol) because of the interaction between the heterogeneous nucleation effect and blocker effect of nano-Al 2 O 3 .
研究领域:
材料科学
·
热能存储
·
物理化学
·
复合材料
·
能源材料
✓ 已验证
DOI
高影响因子
ENERGY & FUELS
·
2022
·
IF 4.654
Xun Zhou,Shaojie Wu,Yongming Luo,Linhua Zhu,Dedong He
Propane dehydrogenation (PDH) is a very important and efficient propylene production process. Currently, it is a challenge to design a catalyst that can replace precious Pt and toxic Cr. Ni species are widely used in reactions for the activation of C–C and C–H bonds, but making Ni species active sites for alkane dehydrogenation is a challenge. In this paper, a series of catalysts with different Ni loadings were impregnated onto dealuminated β zeolite, and it was observed that low loadings of the metal could improve Ni dispersion and produce a high amount of Lewis acid sites, thus inhibiting the side reactions during the PDH process. The characterization results demonstrated that Ni species at low loadings were successfully introduced into vacancy defects over the dealuminated β zeolite. Moreover, good dispersion of Ni sites and excellent reactivity were obtained, with 42% initial propane conversion and a high propylene generation rate of 0.8 g–1·h–1, which was higher than those of many other metal catalysts. This study provides new ideas for the development of economical and environmentally friendly PDH catalysts.
研究领域:
催化化学
·
材料化学
·
工业催化
·
能源化学
·
多相催化
·
表面科学
✓ 已验证
DOI
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2022
·
IF 6.267
Song-Tao Dong,Xin Ye,Zhuang Fu,Xiaoyun Jin,Junlin Wei,Lei Wang,Ya-Mei Zhang
In this study, a series of La 1−x Sr x AlO 3 (x = 0.0, 0.1, 0.15, and 0.2) nanotubes were prepared by electrospinning method, and their morphological and electrochemical properties were characterized. The results show that the La 1−x Sr x AlO 3 (x = 0.0, 0.1, 0.15, and 0.2) nanotubes exhibit a distinct hollow structure, the average diameters of the nanofibers are ∼75 nm, 70 nm, 95 nm, and 142 nm. The electrochemical results show that the La 1−x Sr x AlO 3 nanotubes have excellent electrochemical performance, and the maximum specific capacitance of 180 F/g for the La 0.9 Sr 0.1 AlO 3 . After 1500 charge–discharge cycles, the specific capacitance of the La 0.9 Sr 0.1 AlO 3 electrode retained ∼99%, indicating that it has good cycling stability and long service life. This provides a promising electrode material for supercapacitors.
研究领域:
材料科学
·
电化学
·
纳米材料
·
能源存储
·
功能陶瓷
·
电容器
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Xue Li,Yan-Rong Liu,Wen-Min Liao,Ai-Ping Jia,Yue-Juan Wang,Ji-Qing Lu,Meng-Fei Luo
Catalytic propane combustion was performed on a series of supported Pt/AlF 3 catalysts. These catalysts are very active and stable in the reaction, and the 0.2Pt/AlF 3 catalyst gives the highest specific reaction rate of 207.3 μmol g Pt −1 s −1 at 220 °C. The 1Pt/AlF 3 is much more active than the reference Pt/Al 2 O 3 catalyst, due to its higher content of metallic Pt species than that in the Pt/Al 2 O 3 . Furthermore, turnover frequency (TOF) based on Pt dispersion increases with the surface concentration of metallic Pt 0 in the catalyst, suggesting these species might be the active sites. Furthermore, synergistic roles of metallic and oxidized Pt species are found, as the TOFs calculated based on surface Pt 0 concentration reaches a maximum at the Pt 0 /Pt 2+ molar ratio of about 1. Such optimal Pt 0 /Pt 2+ ratio implies the requirement of Pt 0 Pt 2+ pair in the reaction, probably due to the activation and cleavage of C H bond on metallic Pt atom and the sequential oxidation on the oxidized Pt atoms.
研究领域:
催化化学
·
环境化学
·
材料化学
·
表面科学
·
能源化学
✓ 已验证
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2019
·
IF 4.182
Meihua Zhu,Shiming Huang,Yudan Gong,Yunyan Zhou,Xinyu Chen,Yongsheng Liu,Na Hu,Fei Zhang,Xiangshu Chen,Hidetoshi Kita
Good separation performance NaY zeolite membrane was successfully prepared on the tubular mullite support by fluoride-containing precursor synthesis gel. The fluoride source had a great influence on NaY zeolite membrane growth and separation performance for EtOH/ETBE mixture, the NaF containing precursor gel was benefit for preparing high Si/Al ratio, fine reproduction quality and long-term stable NaY zeolite membrane. Solid state 19 F MAS NMR characterization results indicated that the fluorine existed in the channel of NaY zeolite crystals. Both flux and separation factor of the NaY zeolite membrane were greatly depended on the separation temperature and composition of EtOH/ETBE mixtures. The NaY zeolite membrane presented eminent long-term stability for separating 20 wt% EtOH/ETBE mixture at 60 °C, even if the test time was prolonged to 80 h, the flux and separation factor were kept 1.30 kg m −2 h −1 and 1100.
研究领域:
材料科学
·
膜分离技术
·
化学工程
·
无机非金属材料
·
功能材料
✓ 已验证
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2019
·
IF 4.029
Kang Qian,Yubai Pan,Zewang Hu,Xiaopu Chen,Yun Shi,Xin Liu,Haohong Chen,Martin Nikl,Jiang Li
SrHfO 3 :Ce and SrHfO 3 :Ce,Al powders were prepared by the solid-state synthesis using the commercial HfO 2 , SrCO 3 , CeO 2 and α-Al 2 O 3 as the starting materials. All the SrHfO 3 :Ce and SrHfO 3 :Ce,Al powders calcined at different temperatures within 1100 °C–1300 °C for 8 h in air exhibited a pure SrHfO 3 phase. Meanwhile, the effects of different calcination temperatures and co-doped alumina on the microstructure of SrHfO 3 :Ce,Al powders were discussed. SrHfO 3 :Ce and SrHfO 3 :Ce,Al ceramics were successfully fabricated via the vacuum sintering at 1800 °C for 20 h. The alumina acted as the sintering aid, which promoted the densification and eliminated the intragranular pores of SrHfO 3 :Ce,Al ceramics. The charge disbalance was effectively compensated by co-doped alumina. SrHfO 3 :Ce,Al ceramics exhibited a higher light yield of 5700 ph/MeV compared with 4600 ph/MeV obtained in SrHfO 3 :Ce ceramics. The charge traps in ceramics and their effects on scintillation properties were also investigated by thermoluminescence measurement.
研究领域:
材料科学
·
无机非金属材料
·
发光材料
·
陶瓷学
·
核医学成像
·
辐射探测
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）