Advanced Energy Materials
·
2018
·Vol. 9
·期 1
·1802739
·
IF 21.875
Ang Gao,Min Li,Nannan Guo,Daping Qiu,Yan Li,Senhao Wang,Xia Lu,Feng Wang,Ru Yang
Novel and low-cost rechargeable batteries are of considerable interest for application in large-scale energy storage systems. In this context, K-Birnessite is synthesized using a facile solid-state reaction as a promising cathode for potassium-ion batteries. During synthesis, an ion exchange protocol is applied to increase K content in the K-Birnessite electrode, which results in a reversible capacity as high as 125 mAh g −1 at 0.2 C. Upon K + exchange the reversible phase transitions are verified by in situ X-ray diffraction (XRD) characterization. The underlying mechanism is further revealed to be the concerted K + ion diffusion with quite low activation energies by first-principle simulations. These new findings provide new insights into electrode process kinetics, and lay a solid foundation for material design and optimization of potassium-ion batteries for large-scale energy storage.
研究领域:
材料科学
·
电化学
·
能量存储与转换
·
电池技术
✓ 已验证
DOI
高影响因子
FUEL
·
2022
·
IF 8.035
Xiaojun Dai,Yan Cheng,Meng Si,Qiang Wei,Dongdong Chen,Wenbin Huang,Yasong Zhou
A series of SAPO-11 molecular sieves were synthesized in the concentrated gel system by reducing the water content in the synthesis system. With SAPO-11 molecular sieves as supports, NiW-supported catalysts were prepared for the hydroisomerization of n-hexadecane. SAPO-11 molecular sieves and catalysts were characterized by XRD, SEM, N 2 adsorption–desorption, NH 3 -TPD, Py-IR, HRTEM and XPS. The results showed that reducing the water content in the synthesis system could increase the mesoporous volume of SAPO-11 molecular sieve and improve the acidity of SAPO-11. For the corresponding catalysts, using SAPO-11 synthesized in concentrated gel system as the support weakened the interaction between the active phase and the support, and increased the dispersion and stacking number of the active phase, which effectively improved the catalytic performance of the catalyst. The yield of i-hexadecane of the catalyst NiW/45W-SA corresponding to SAPO-11 synthesized in conventional water content system was 28.14%, while that of the catalyst NiW/5W-SA corresponding to SAPO-11 synthesized in concentrated gel system was 52.24%. According to the distribution of isomers, it is inferred that hydroisomerization of n-hexadecane over NiW/SAPO-11 follows the pore-mouth mechanism.
研究领域:
催化
·
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 25
·14534-14544
·
IF 12.732
Fei Shen,Zhongti Sun,Liang Zhao,Yuanhua Xia,Yanyan Shao,Jingsheng Cai,Shuo Li,Chen Lu,Xiaoling Tong,Yu Zhao,Jingyu Sun,Yuanlong Shao
Developing high energy density and high-power density electrode materials is of great importance for lithium-ion batteries to satisfy the requirements of the customer market. We report that introducing Mo into Nb2O5 at a low temperature leads to phase transition from bronze-phase T to crystallographic shear-phase H. The resulting Nb1Mo0.1O2.8 exhibits higher energy density than T-Nb2O5 and improved rate-performance and cycling-stability compared to H-Nb2O5. Neutron diffraction was applied to Nb1Mo0.1O2.8 to characterize the structure and two-phase ratios of the mixed metal oxide together with the first-principles method to calculate the possible Mo substitution sites. The Nb1Mo0.1O2.8 anode displays intrinsic pseudocapacitive lithium-ion intercalation with a high energy density of 362 mA h g−1 at 0.2C. In situ XRD results suggest that Nb1Mo0.1O2.8 is able to intercalate more lithium ions with smaller structure expansion compared with H-Nb2O5; furthermore, a computational method reveals that the introduction of Mo into the oxide increases Li atom adsorption energies and decreases the diffusion barrier. Therefore, Nb1Mo0.1O2.8 is a promising anode material for high-capacity and high-rate lithium-ion energy storage.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2019
·
IF 2.781
Yun Yang,Tianjun Zhang,Dan Zhou,Xinchao Liu,Shuijin Yang,Xinhuan Lu,Qinghua Xia
Recently, a Ti-containing hollownest-structured zeolite (Ti-HSZ) material with the shell constructed by randomly intergrown MWW (framework type code) flaky crystals has been synthesized through one-step rotating hydrothermal method within 3.5 days, which shows predominant catalytic property for the epoxidation of alkenes . Herein, it is firstly reported that the crystallization efficiency of Ti-HSZ material can be notably increased by applying seeds-assisted synthesis method. Thus-crystallized materials have been characterized by XRD , UV–vis, XPS , SEM , TEM, FT-IR, and N 2 adsorption-desorption. Moreover, the key controlling factors are revealed to include the addition percentage of seed crystals, rotating rate and filling degree of autoclave. When 2 wt% or 3 wt% seed crystals are added into the reaction gel, the crystallization time of Ti-HSZ can be sharply reduced to 2.5 days or even 2.0 days, respectively. Particularly, thus-synthesized Ti-HSZ-SM material still maintains hollownest morphology characteristic and excellent catalytic activity and catalytic stability. About 95% allyl chloride can be converted into corresponding epoxide when using H 2 O 2 as oxidant, and about 85% cyclopentene and 87% cyclooctene can be converted into corresponding epoxides when using TBHP as oxidant, with the selectivity for epoxides of nearly 100%.
研究领域:
催化
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2021
·
IF 5.302
Qi Li,Jianliang Xie,Jin Hu,Xin Wang,Chengyong Yu,Shaoliang Jiang,Peng Liu,Chengli Sun,En Li,Longjiang Deng
The dielectric layer plays a key role in regulating electromagnetic wave broadband scattering based on meta-surface technology. Herein, the physical properties of composite powder, prepared by spray drying of CaO-B 2 O 3 -SiO 2 (CBS) glass-ceramic powder and Al 2 O 3 in different mass ratios, are systematically investigated. Meanwhile, a high enthalpy atmospheric plasma spraying equipment is utilized to prepare CBS/Al 2 O 3 composite coatings , and the morphology, physical properties and dielectric properties of the composite coating are analyzed. The XRD and DSC data of the composite coating reveal that the crystallization behavior of β-CaSiO 3 and CaB 2 O 4 gradually disappear with the increase of Al 2 O 3 content. Hence, only CaAl 2 Si 2 O 8 phase is observed during heat treatment. The experimental results confirm that the dielectric properties of CBS/Al 2 O 3 composite coating conform to the rule of mixture for composite materials. Also, the dielectric properties are affected by porosity and crystallization rate.
研究领域:
材料科学
·
电磁工程
·
涂层与薄膜
·
复合材料
✓ 已验证
产品关联
DOI
高影响因子
WASTE MANAGEMENT
·
2023
·
IF 8.1
Yu Zhang,Meng Yu,Jiangmin Guo,Shaojun Liu,Hao Song,Weihong Wu,Chenghang Zheng,Xiang Gao
The pretreatment of cathode material before leaching is crucial in the spent lithium-ion battery hydro-metallurgical recycling. Here research demonstrates that in-situ reduction pretreatment could dramatically improve the leaching efficiencies for valuable metals from cathodes. Specifically, calcination under 600 °C without oxygen using alkali treated cathode can induce in-situ reduction and collapse of oxygen framework, which is ascribed to the carbon inherently contained in the sample and promote the following efficient leaching without external reductants. The leaching efficiencies of Li, Mn, Co and Ni can remarkably reach 100%, 98.13%, 97.27% and 97.37% respectively. Characterization methods, such as XRD, XPS and SEM-EDS, were employed and revealed that during in-situ reduction, high valence metals such as Ni 3+ , Co 3+ , Mn 4+ can be effectively reduced to lower valence states, conducive to subsequent leaching reactions. Moreover, leaching processes of Ni, Co and Mn fit well with the film diffusion control model, and the reaction barrier is in accordance with the order of Ni, Co and Mn. In comparison, it is observed that Li was leached with higher efficiency regardless of the various pretreatments. Lastly, an integral recovery process has been proposed and economic assessment demonstrates that in-situ reduction pretreatment increases the benefit with a negligible cost increase.
研究领域:
材料科学
·
环境工程
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Hui Yao,Wan-ting Zhang,Ting-yu Yan,Xiao-qin Li,Xiao-feng Wang
Metal-Organic Frameworks (MOFs) are promising materials in electrochemical sensor. Herein, Cu-doped zeolitic imidazolate framework (ZIF) was synthesized by hydrothermal method. The prepared composite was characterized by XRD, FTIR and SEM. Then the material was modified onto the surface of glass carbon electrode (GCE) with chitosan(CHIT) and Cytochrome C (cyt c ). The modified electrode showed good electrochemical activity toward the reduction of hydrogen peroxide (H 2 O 2 ). Under optimized conditions, the linear response of the sensor to H 2 O 2 ranges from 10～5200 μM, with a detection limit of 3.7 μM (S/N=3). Finally, the sensor was successfully applied to determine H 2 O 2 in water samples. Thus, the Cu-doped ZIF material has great potential for applications in electrochemical sensors.
研究领域:
分析化学
·
材料科学
·
电化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2022
·
IF 6.364
Cunku Wang,Jie Ding,Zhixiong Huang,Yingluo Zhuang,Yan Li,Minxian Shi,Yan Qin
In this work, two ceramizable phenolic adhesives were prepared using ZrSi 2 particles or ZrSi 2 /B 4 C mix particles as the inorganic fillers. The thermal stability, bonding strength , microstructure and phase composition of the adhesives were investigated by TGA , shear strength of Al 2 O 3 joints, SEM, EDS , XRD and XPS . The results show that these two adhesives have different bonding performances and ceramicization evolutions above 600 °C in air due to the addition of the second phase particles B 4 C. The bonding strength of ZrSi 2 /B 4 C modified phenolic adhesive after treatment at 1200 ℃ can be as high as 36.6 MPa, while the bonding strength of ZrSi 2 modified phenolic adhesive under the same conditions is only 17.5 MPa. B 4 C undergoes oxidation reaction before ZrSi 2 , and the oxidation product B 2 O 3 liquid phase not only reacts with ZrSi 2 to form oxidation-resistant ZrB 2 , but also can dissolve the high temperatures defects of the adhesive and chemically bond with the Al 2 O 3 substrates at the interface.
研究领域:
材料科学
·
胶粘技术
·
热工程
·
表面科学
✓ 已验证
产品关联
DOI
高影响因子
Materials Science and Engineering B-Advanced Functional Solid-State Materials
·
2023
·
IF 3.6
Hailu Fan,Kuo Cao,Jinxiao Ba,Hui Cheng,Xianghai Yu,Aiying Song,Chengqun Xu,Yihua Wang,Donghua Fan
In this work, we reported a facile approach to fabricate molybdenum sulfide (MoS 2 ) electrocatalyst with the introduction of vanadium(V) for improved catalytic performance. The morphology of prepared samples can be characterizated by SEM observation. The XRD and XPS spectra further reveal that the proper amount of vanadium introduction can effectively prompt the increase of crystallinity and formation of edge-terminated structure in MoS 2 nanostructure . The experimental results display that the morphology of MoS 2 can be modulated by various amounts of V incorporation. The conductivity of prepared samples is increased by incorporating a certain amount of graphene. MoS 2 nanostructure with 20% V incorporation shows excellent catalytic performance, and the corresponding mechanism is also discussed. The electrochemical performance of 20%V-MoS 2 can be further improved by the introduction of appropriate graphene. Compared with pure MoS 2 samples, 20%V-MoS 2 /Graphene 7.5 shows a small resistance and excellent cycling stability in the acidic electrolyte, as well as the overpotential at 10 mA decreases from 213 mV to 168 mV.
研究领域:
材料科学
·
电化学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Nano Research
·
2022
·
IF 1.78
Rusul Mohammed Abdallah,Raad M.S. Al-Haddad
There are many methods for synthesizing magnetite nanoparticles. Most methods take a long time, and the result is undesirable. In this paper a green method was used to synthesize nanoparticles because it takes a short time and is both straightforward and eco-friendly. It is done by adding : =1:2 molar ratio solution with different amounts of extract and different amounts of NaOH solution for 20 min at different temperatures, in hotplate stirrers, to control their relative size. UV-Vis spectroscopy, vibrating sample magnetometer technique (VSM), transmission electron microscopy (TEM), and X-ray diffraction (XRD) were used to characterize the magnetite nanoparticles. The result confirms that the changes in amounts of NaOH and extract led to a change in the pH of a solution and that the increase in amounts of the extract caused the low addition of NaOH. These changes influenced the process of synthesis and characterization. The Uv-vis analysis confirms that the surface plasmon resonance had a highly visible brad peak in the 290–460 nm range, as well as a peak shift to shorter wavelengths (blue shift) with a pH change and a peak shift to longer wavelengths (red shift) with a temperature change. TEM imaging confirms that all the synthesized had a spherical shape with size changed according to a parameter change of within 40–9 nm. Magnetic analysis showed the magnetite nanoparticles synthesized have smaller sizes and are superparamagnetic with the influence of particle size on the magnetic properties, including Hc, Ms, and Mr.
研究领域:
材料科学
·
纳米技术
·
化学
·
物理学
✓ 已验证
DOI
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2022
·Vol. 48
·期 6
·2557-2573
·
IF 3.134
Liu Yueyu,Yin Zhili,Wang Ziqing,Mou Ronglin,Wei Zhong
High surface area ZrO 2 –KOH sample was prepared and used the catalyst for the synthesis of glycerol carbonate (GC) from dimethyl carbonate (DMC) and glycerol. The structure properties of ZrO 2 –KOH were characterized by XRD, BET, CO 2 -TPD, XPS, and ICP-OES. It was found that the strong basicity of ZrO 2 –KOH might be attributed to the oxygen vacancies as well as the big surface area. Experiments were developed to evaluate the effects of catalysis loading, proportion of reactants, temperature and reaction time on the conversion of glycerol to GC. The consequences showed that ZrO 2 –KOH was a highly efficient basic catalyst for synthesis of GC from glycerol. The catalytic performance of ZrO 2 –KOH is much better than that of ZrO 2 –KOH–CP, ZrO 2 –NH 4 OH, and some reported heterogeneous catalysts. And the higher performance of ZrO 2 –KOH was ascribed to the strong basicity. 99.43% conversion was obtained in a particular situation of catalyst/glycerol weight ratio of 3 wt%, DMC/glycerol molar ratio of 3:1, reaction temperature of 80 °C, and reaction time of 2 h. The plausible reaction mechanism for the transesterification on the strong basic active sites was discussed.
研究领域:
催化
·
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2019
·Vol. 55
·期 7
·2741-2749
·
IF 3.442
Meng Cheng,Li Wenqi,Ren Chunrong,Zhao Junchuan
Powellite ceramic represents a waste form matrix material to immobilize minor actinides and Mo from reprocessed UMo nuclear fuel. In this paper, the Ca 1−x Li x/2 Gd x/2 MoO 4 (0 ≤ x ≤ 1) series is prepared by solid-state reaction using Gd 3+ as trivalent minor actinide (Cm 3+ ) surrogate, and the structure/microstructure is characterized by XRD, HRTEM, Raman spectroscopy and SEM. Rietveld refinements show that the couple (Gd 3+ and Li + ) enters into the eightfold coordinated Ca site of the powellite structure. With the increase in the contents of Gd and Li, Raman bands broaden due to the distortion of MoO 4 tetrahedra and disordered arrangements of Gd 3+ and Li + . The chemical durability analyzed by the PCT-B indicates that the leaching behaviors of Gd and Mo are related to the interfacial dissolution–reprecipitation mechanism. For the Ca 0.5 Li 0.25 Gd 0.25 MoO 4 ceramic, 7-day NL Gd and NL Mo are shown in the order of ~ 10 −4 and ~ 10 −4 g m −2 , respectively. Thus, our initial results of the structure and chemical durability will provide insights to design new single- or multiphase waste forms for the Mo-rich HLW conditioning.
研究领域:
材料科学
·
核工程
·
化学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）