BULLETIN OF THE CHEMICAL SOCIETY OF ETHIOPIA
·
2024
·Vol. 38
·期 5
·1429-1437
·
IF 1.3
Yu Sun,Chaofan Li,Hongcheng Gao,Jiaming Li,Jiabin Hao
A cubic spinel LiMn2O4 cathode material with nanoscale was synthesized via a facile liquid-combustion method at 600, 750 and 850 ℃. The crystal structure and surface morphology of LiMn2O4 electrodes have been characterized by using X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) technique. The samples have an average diameter of 200 nm with an octahedral structure with high crystallinity. Benefiting from the excellent structure, the sample prepared at 750 ℃ delivers the highest first discharge capacity of 115.3 mAh·g−1 with remaining 101.5 mAh·g−1 after 400 cycles at 1 C. Moreover, it exhibits a good cycling performance at 55 ℃, still had the capacity of 105.4 mAh·g−1 with a capacity retention of 71.2% following 282 cycles. The facilely synthesized octahedral LiMn2O4 provides a practical application strategy for lithium-ion batteries.
KEY WORDS: Spinel LiMn2O4, Liquid-combustion method, Lithium-ion batteries
Bull. Chem. Soc. Ethiop. 2024, 38(5), 1429-1437.
DOI: https://dx.doi.org/10.4314/bcse.v38i5.18
研究领域:
材料科学
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电化学
✓ 已验证
DOI
高影响因子
ChemistrySelect
·
2025
·Vol. 10
·期 16
·e202405818
·
IF 2
Gideon Kofie,Yin Fengxiang,Xu Rongji,Wu Qinxi
Graphical This study examines NdCoO 3 perovskite catalysts synthesized via solution combustion using citric acid for ammonia decomposition. The best performing catalyst 1.25:1NdCoO 3 -700 exhibits 96% conversion at 550 °C and a hydrogen production rate of 30 mmol·g⁻¹·min⁻¹. High basicity, optimized pore structure, and surface properties enhance the performance highlighting NdCoO 3 ’s potential for efficient hydrogen production. The decomposition of ammonia to produce hydrogen requires an efficient catalyst to lower the energy demand for this reaction. This study investigates the performance of NdCoO 3 in enhancing ammonia decomposition for hydrogen production. The NdCoO 3 perovskite is synthesized using the solution-combustion method with citric acid as fuel. The performance evaluation of the catalysts is conducted in a fixed-bed reactor. The catalysts are characterized by establishing the relationship between structure and activity. A fuel-to-metal ratio of 1.25:1 and a calcination temperature of 700 °C result in a catalyst with favorable physicochemical attributes. The catalyst 1.25:1NdCoO 3 -700 is obtained, which achieves 96% ammonia conversion at 550 °C, with a hydrogen generation rate of 30.6 mmolgcat −1. min −1 , making it the most active catalyst with an apparent activation energy ( E a ) of 64.47 KJ mol −1 . The surface analysis reveals that variations in surface basicity and favorable porosity affected the activity of the 1.25:1NdCoO 3 -T catalysts. The fuel-to-metal ratio and the calcination temperature are key factors influencing the activity of the NdCoO 3 catalyst.
研究领域:
材料科学
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催化化学
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能源转化
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Wenwen Zhao,Kuibao Zhang,Zongsheng He,Jiali Xue,Weiwei Li,Dayan Xie,Haibin Zhang
Highly transparent La 1.28 Yb 1.28 Zr 2 O 7.84 ceramic was prepared by vacuum sintering using nanosized raw powders, which were synthesized by a simple solution combustion method using rare earth nitrate as the raw materials. The as-burnt powders were calcined at 1200 ℃ and then ball-milled for 24 h with resultant particle size of about 60 nm. The two phases, cubic pyrochlore and defective fluorite, are uniformly distributed in the ceramic. La 1.28 Yb 1.28 Zr 2 O 7.84 transparent ceramic with the maximum in-line transmittance of 83.9% was successfully prepared at 1850 ℃ for 6 h in a vacuum furnace.
研究领域:
材料科学
·
无机化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Yongshun Liang,Lang Xu,Ya Li,Jie Ding,Yiyao Li,Kaijiao Duan,Wei Bai,Junming Guo,Mingwu Xiang
Layered Ni-rich oxides LiNi x Co y Mn 1-x-y O 2 (x ≥ 0.6, x + y = 1) are considered the best promising cathode material for high-performance lithium-ion secondary batteries. However, the time-consuming and complicated preparation process of spherical precursors greatly increases the consumption of energy and time, whilst suffering the challenges of liquid waste and Li uniform distribution. Herein, a simple microwave liquid phase flameless combustion method with the advantages of time-saving and energy-conservation has been proposed to synthesize Ni-rich LiNi 0.6 Co 0.2 Mn 0.2 O 2 (NCM 622 ). The NCM 622 powders with uniform element distribution are obtained by heating the liquid mixture of raw materials in a simple domestic microwave oven only for 5 minutes and without waste liquid production. Subsequently, the microwave-synthesized NCM 622 powders are further calcined in high-temperature with different temperatures and time in order to obtain the final products with high crystallinity and good electrochemical performances. As a result, the optimal NCM 622 cathode material calcined at 800 °C for 14 h exhibits excellent irregular polyhedral morphology and low degree of Li + /Ni + mixing, whilst displays high first discharge capacity of 179.1 mAh g −1 and 204.9 mAh g −1 with the capacity retention of 88.21 % and 81.36 % (100 cycles) in 3–4.3 V and 3–4.5 V (0.2 C), respectively.
研究领域:
材料科学
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能源技术
✓ 已验证
DOI
高影响因子
MATERIALS LETTERS
·
2013
·
IF 2.224
Jianxiu Liu,Dafeng Zhang,Xipeng Pu,Jiaxing Liu,Renqian Zhang
Zn 1− x Cd x S ( x =0–1.0) powders were synthesized by a simple combustion method using cadmium nitrate, zinc nitrate and thiourea as raw materials. The structures, morphologies, absorbance, luminescence and photocatalytic properties of the samples were studied by X-ray powder diffraction, transmission electron microscopy , ultraviolet–visible spectrophotometry and photoluminescence . The results show that all Zn 1− x Cd x S samples exhibit hexagonal structure and no metastable cubic phase is obtained. With increasing content of Cd, red-shifts are observed in both the absorption edges of UV–vis absorption spectra and emission bands of photoluminescence spectra. Among all Zn 1− x Cd x S samples, CdS shows the best visible-light photocatalytic performance due to its narrow bandgap.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
·
IF 19.503
Qi Li,Yi-lei Li,Bo Li,Ying-juan Hao,Xiao-jing Wang,Rui-hong Liu,Yuan Ling,Xinying Liu,Fa-tang Li
In layered Bi-O-X materials, {001} and {110} facets are regarded to be highly active. However, dominant facets in bismuth-rich materials are rarely studied so far. In this paper, the role of main {314} facet of Bi 5 O 7 I is investigated for the first time. Bi 5 O 7 I samples with adjustable {314} and {008} facet ratios are synthesized using ionic liquid self-combustion method. The inducing growth role of tetramethylammonium iodide for {314} main facet is revealed. Photocatalytic experiments indicate that the activity of Bi 5 O 7 I material with {314}/{008} facet ratio of 4.32 are lower than those of Bi 5 O 7 I with facet ratio of 5.23 and 4.56, implying the increase of {008} facet proportion could not effectively improve the redox performance. Meanwhile, the controllable oxygen vacancy concentration can be realized by constructing reduction atmosphere. Photoelectrochemical test results show that the synergistic effect of facet ratio and the oxygen vacancies lead to the improvement of charge carriers.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
SURFACE ENGINEERING
·
2020
·
IF 2.433
Bo Yang,Mingze Xu,Tingsong Zhang,Jinhua Li,Xueying Chu,Fangjun Jin,Yingjiao Zhai
In this study, fluorine-doped ZnO (FZO) transparent conductive film was prepared using sol-combustion method at a low temperature. The optimized synthesis conditions were evaluated based on the analysis of crystal structure, morphology, and photoelectric properties. The results of X-ray diffraction (XRD), scanning electron microscopy (SEM), UV–visible absorption spectroscopy (UV–vis), and Hall test (HALL) show that under the optimal ratio of precursor solution and optimal doping concentration (10%), the sol-combustion method can produce FZO transparent conductive film with a higher transmittance (80%), higher conductivity (36.9 Ω cm), and better crystalline quality and surface morphology at a relatively low temperature of 250°C. The FZO films produced using sol-combustion method have good application prospect.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Guanghui Han,Menggang Li,Yongsheng Yu,Weiwei Yang,Ji Li,Shichong Xu,Ming Feng,Haibo Li
It is extremely desirable but challenging to develop a facile synthesis to directly prepare permanent magnet foam with high coercivity ( H c ) and low mass density to meet the requirements of advanced magnets in modern industry. In this work, we developed a facile strategy to synthesize cobalt ferrite foam by solution combustion method and subsequently annealing treatment. The structure and magnetic properties of the foams can be influenced by the ratios of glycine to nitrate (G/N), Co content and annealing treatment temperatures. The increase in the mean grain sizes within the single domain range gives rise to an enhancement in coercivities. The highest H c of ∼3 kOe with an ultra-low mass density of ∼45 mg/cm 3 can be successfully obtained by controlling the preparation process. The work opens up a new way to prepare ultra-light Fe-based oxides for magnetic and catalytic applications.
研究领域:
材料科学
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磁学
✓ 已验证
产品关联
DOI
高影响因子
JOM
·
2020
·Vol. 72
·期 9
·3296-3302
·
IF 2.054
Liu Jiaming,Lu Yanhua,Wang Ruixiang,Xu Zhifeng,Li Xue
The development of low-cost, simple, and efficient methods to prepare high-performance anode materials is a huge challenge. In this work, Co 3 O 4 with high crystallinity was prepared by a solution combustion method. When used as an anode electrode, it displayed excellent electrochemical performance. The reversible capacity remained at 1115.7 mAh g −1 after 100 cycles at 200 mA g −1 . Moreover, the capacity retention rate reached 96.3% after 300 cycles at 1000 mA g −1 . This excellent electrochemical performance can be attributed to the special macroporous structure of Co 3 O 4 , which can increase the contact area between the electrolyte and active material, improve the transport capacity of lithium ions, and effectively alleviate the volume change stress caused by charging and discharging. These results show that the solution combustion synthesis is simple and efficient, providing a low-cost production method for production of high-performance energy storage materials.
研究领域:
材料科学
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能源存储
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2021
·Vol. 32
·期 24
·28605-28617
·
IF 2.478
Wang Zexing,Guo Biao,Xu Dong,Li Jiamao
We report a successful fabrication of 0.6Ca 0.61 Nd 0.26 TiO 3 –0.4Nd(Zn 0.5 Ti 0.5 )O 3 (hereinafter abbreviated as 6CNT–4NCT) microwave ceramics with good sintering activity and desired dielectric properties from EDTA-gel combustion synthesized powders in this paper. The as-synthesized nanopowders have been characterized by X–ray diffraction (XRD), Fourier transformation infrared (FT–IR), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) techniques, respectively. The sintering behavior and dielectric performance have been evaluated on the sintered ceramics. The as-obtained product with amorphous structure could be directly crystallized and produced pure 6CNT–4NCT solid solution phase with orthorhombic perovskite structure at a relatively low temperature of 700 °C, without formation of any intermediate phase. TEM images revealed that homogeneous and well dispersed spherical-shaped nanostructure with an average particle size of 23.8 nm was formed at 800 °C. Well-dense 6CNT–4NCT bulk ceramics with 98.8% relative density were obtained at a relatively low sintering temperature of 1225 °C due to high sintering activity of nanopowders. Moreover, the bulk ceramics exhibited a higher quality factor ( Q × f ) value than those prepared via the conventional solid-state reaction method. Desired microwave dielectric properties were achieved at 1200 °C: dielectric constant ε r = 57.2, Q × f = 59,360 GHz, and temperature coefficient of resonant frequency τ f = + 1.95 ppm/°C. This study indicates that the EDTA-gel combustion route is a convenient, low-cost, and interesting route to fabricate high-quality microwave ceramics for practical applications.
研究领域:
材料科学
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电子工程
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2016
·
IF 4.803
Yujing Sun,Zhicai Xing,Shu Jiang,Hexin Zhang,Gang Wei,Zhuang Li,Xuequan Zhang
We demonstrated here the crosslinked N-doped graphene (NG) can be rapidly prepared through a one-step burning process of graphene oxide . The doping process completed within 3 minutes and the N content in the obtained NG reached to 5.6%. The obtained crosslinked NG shows mesoporous structure with relatively high specific area, large pore volume and various N types. As a supercapacitor , the resultant NG exhibits rapid diffusion of electrolyte ions and shows superior capacitive performance, excellent specific capacitance (317.5 F/g at the current density of 1 A/g) and high cycling stability (93% retention after 5000 cycles). The obtained results indicate that the crosslinked NG is a promising candidate for creating supercapacitors with high performance and relatively low cost.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
OPTICAL MATERIALS
·
2022
·
IF 3.754
Fengxia Zou,Ming Li,Zengyan Du,Yi Song,Liang Li,Guanghai Li
In modern agriculture, light plays an important role in plant growth. Far red light controls the whole growth process of plants from germination to vegetative growth to flowering. Here, we report the preparation and photoluminescence (PL) performance of Cr,Bi co-doped SrGdAlO 4 phosphors by solution combustion method. The SrGdAlO 4 :Cr 3+ ,Bi 3+ phosphors exhibit far red broadband PL of 660–780 nm excited at 458 nm, and the maximum emission peak position is at 713 nm. It was found Cr 3+ and Bi 3+ replaced the positions of Al 3+ and Gd 3+ in the host material, respectively. The PL performance of SrGdAlO 4 :Cr 3+ ,Bi 3+ phosphors mainly depends on the 2 E 2 → 4 A 2 transition of Cr 3+ , and the addition of Bi 3+ can effectively enhance the PL intensity of the phosphors. Notably, the SrGdAlO 4 :Cr 3+ ,Bi 3+ phosphors also exhibit obvious far red PL when coated onto glass substrate or mixed with plastics without affecting their visible light transmission. We believe our work will excite interests in further exploring the practical application of SrGdAlO 4 :Cr 3+ ,Bi 3+ phosphors as plant growth regulator in greenhouse.
研究领域:
农业科学
·
材料科学
·
植物生物学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）