JOURNAL OF NUCLEAR MATERIALS
·
2018
·
IF 2.447
Xin Wang,Min Xue,Songbai Liu,Kuo Jiang
In this paper, (Gd 1− x Ce x ) 2 Zr 2 O 7+ x immobilized matrices with high cerium (Ce) amount-of-substance fractions (up to 90%) were prepared by sol-spray pyrolysis , and then sintered at 1600 °C in air. XRD results showed that all samples were in a mixture of pyrochlore and fluorite phase, even after sintering at 1600 °C. All the sintered bulks were dense, and the densities were independent of the additive content . The SEM results showed that all samples were chemically homogeneous. There was no segregation in the grain boundary. EDS quantification yielded a mean composition close to the stoichiometric chemical composition.
研究领域:
材料科学
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核废料管理
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产品关联
DOI
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 5
·2343-2352
·
IF 3.049
Feng Zhao,Shuangde Li,Xiaofeng Wu,Renliang Yue,Weiman Li,Yunfa Chen
CuO–CeO2 nanocatalysts with different amounts of Mn dopping (Mn/Cu molar ratios of 0.5 : 5, 1 : 5 and 1.5 : 5) were synthesized by flame spray pyrolysis (FSP) method and tested in the catalytic oxidation of CO. The physicochemical properties of the synthesised samples were characterized systematically, including using X-ray diffraction (XRD), Raman spectroscopy, field-emission scanning electron microscopy (FESEM), Brunauer–Emmett–Teller (BET), X-ray photoelectron spectroscopy (XPS), oxygen-temperature programmed desorption (O2-TPD), hydrogen-temperature programmed reduction (H2-TPR) and in situ diffuse reflectance infrared Fourier transform spectroscopy (in situ DRIFTS). The results showed that the 1Mn–Cu–Ce sample (Mn/Cu molar ratio of 1 : 5) exhibited superior catalytic activity for CO oxidation, with the temperature of 90% CO oxidation at 131 °C at a high space velocity (SV = 60 000 mL g−1 h−1), which was 56 °C lower than that of the Cu–Ce sample. In addition, the 1Mn–Cu–Ce sample displays excellent stability with prolonged time on CO stream and the resistance to water vapor. The significantly enhanced activity was correlated with strong synergetic effect, leading to fine textual properties, abundant chemically adsorbed oxygen and high lattice oxygen mobility, which further induced more Cu+ species and less formation of carbon intermediates during the CO oxidation process detected by in situ DRIFTS analysis. This work will provide in-depth understanding of the synergetic effect on CO oxidation performances over Mn doped CuO–CeO2 composite catalysts through FSP method.
研究领域:
催化化学
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材料科学
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环境科学
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DOI
高影响因子
ACS Applied Materials & Interfaces
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2021
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IF 9.229
Xing Yuan,Lingquan Meng,Chaohe Zheng,Haibo Zhao
Perovskites have been recognized as affordable substitutes for noble-metal catalysts for their tunable catalytic activity and thermal stability. Nevertheless, the highly demanding synthesis procedure still hinders the application of perovskites in catalytic combustion. In this work, a series of nanostructured SiTiO3 perovskites with B-site partial substitution by Co, Fe, Mn, Ni, and Cu are synthesized via flame spray pyrolysis in one step. The comprehensive characterizations on textural properties of nanostructured perovskites reveal that the flame-made perovskite nanoparticles all exhibit high crystal purity and large specific surface area (∼40 m2/g). Furthermore, the highest catalytic activity is achieved by SrTi0.5Co0.5O3 due to the formation of favorable oxygen vacancies, outstanding reducibility, and oxygen desorption capability. Additionally, the presence of 10 vol % water vapor during long-term testing indicates remarkable durability and water resistance. Finally, the CO oxidation and CH4 dehydrogenation on SrTiO3 incorporating Co atoms are more thermodynamically and kinetically favorable than those on other doped surfaces.
研究领域:
材料科学
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催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Mengkang Yu,Yixuan Sun,Haoran Du,Chao Wang,Wen Li,Ruohao Dong,Hongxia Sun,Baoyou Geng
Traditional carbon materials and transition metal oxides are considered as the best candidates due to their respective advantages for the anode materials of lithium ion batteries. Herein, combining the advantages of carbon and transition metal oxides, we fabricate Co 3 O 4 doped hollow hierarchical porous carbon spheres through a simple spray pyrolysis route with cobalt nitrate and glucose as precursors. The wall thickness of hollow porous spheres can be adjusted through the ratio between cobalt nitrate and glucose. The results of electrochemical test show that the optical product maintains an excellent discharge capacity of 1297.1 mAh g −1 after 200 cycles at 0.2 A g −1 when the molar ratio of glucose and cobalt nitrate is 6:8. In addition, the sample has a discharge specific capacity of 841.0 mAh g −1 after 300 cycles at 1 A g −1 . Hollow hierarchical porous structure can efficiently reduce the path of lithium ion transport, and a suitable wall thickness can support the volume change during charge and discharge. Superior charge/discharge capacity, high carbon content, high yield and low cost turn this product into a more promising anode material for lithium-ion batteries.
研究领域:
材料科学
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2024
·
IF 8.1
Zhao Zhao,Yan Li,Ziyu Chen,Chengzong Li,Haibin Zeng,Chengming Du,Tao Li
Traditional recycling technologies for spent lithium iron phosphate (LiFePO 4 , LFP) usually suffer from issues such as complex procedures, heavy chemical consumption, and limited economic viability. Herein, we propose a method combining FeCl 3 leaching and spray pyrolysis for the high-value-added recycling of spent LFP. Using FeCl 3 as leaching agent, over 99 % of Li is selectively leached out within 30 min with a solid-liquid ratio up to 300 g L −1 . The resulting leaching residue (FePO 4 ) serves as a precursor for the synthesis of new LFP. Subsequently, the Li and Fe-containing leachate undergoes a spray pyrolysis process, yielding a pyrolysis powder comprising LiCl and Fe 2 O 3 . Through a water-leaching procedure, the separation of LiCl and Fe 2 O 3 is achieved based on their distinct solubility in water. The resulting high-purity LiCl solution and Fe 2 O 3 residue are directly utilizable for producing battery-grade Li 2 CO 3 and LFP cathodes, respectively. LFP/C cathodes, synthesized using the recovered Li 2 CO 3 and FePO 4 precursor, exhibit an impressive 99.8 % capacity retention after 200 cycles at a 1C rate. This method holds great economic and environmental benefits by producing high-value-added products while avoiding the consumption of acids or alkalis.
研究领域:
材料科学
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环境工程
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2024
·
IF 6.9
Qiang Wang,Chun-guang Song,Hai-qing Hao,Meng Wang,Zong-yu Feng,Yong-qi Zhang,Xiang-xin Xue,Xiao-wei Huang
Wastewater recycling is the desired goal of the rare earth separation plants for current ecological requirements and economic benefit. The MgCl 2 wastewater generated during rare earth extraction and separation process was treated by spray pyrolysis for the first time to achieve full recycling. The kinetic of spray pyrolysis process and the mechanism affecting the activity of MgO powder were investigated. The results showed that the rate determining step of MgCl 2 solution spray pyrolysis was transformed from a chemical reaction control to a diffusion process control after the temperature exceeded 1073 K. The MgO powder prepared by spray pyrolysis was rough and porous, the embedding of Cl made MgO grains severely distorted, producing more defects. Meanwhile, polycrystalline basic magnesium chloride likewise had more defects. These two points resulted a higher density of defects of MgO powders, and causing higher activity. Moreover, at a temperature of 1173 K, MgCl 2 concentration of 300 g/L and N 2 flow rate of 40 L/min, the thermal decomposition rate of MgCl 2 reached 99.54%, the alkalinity of the powder reached 0.045 mol/g, and the iodine absorption value reached 102.72 mg I 2 /g MgO. Meanwhile, the high purity hydrochloric acid with a concentration of 6.70 mol/L was obtained.
研究领域:
环境科学
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材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2021
·Vol. 32
·期 4
·4125-4131
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IF 2.478
Zheng Han,Liu Ying
Cu 2 ZnSnS 4 (CZTS), with a direct bandgap of 1.5 eV, is a primary candidate material for solar energy conversion applied in both photovoltaics and photocatalysis due to its tremendous reserves and environmental friendly components. Though the utilization of CZTS with phases of kesterite and wurtzite are extensive, until now, the synthesis and growth procedure of both phases are not clearly understood. In this work, we succeed in synthesizing CZTS microspheres with controlled phase through a facile method—ultrasonic spray pyrolysis (USP). By choosing ammonium thioglycolate and l -cysteine as sulfur source, which were found to be the key factor in the phase formation process, CZTS microspheres can be prepared in kesterite phase and wurtzite phase, respectively. After exposing the prepared CZTS microspheres under the Xe lamp irradiation, we found an apparently phase-dependent photocatalytic hydrogen evolution, in which the performance of kesterite phase CZTS sample was almost 2 times as high as that of wurtzite CZTS sample.
研究领域:
材料科学
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能源转换
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光催化
✓ 已验证
产品关联
DOI
高影响因子
Journal of Cleaner Production
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2021
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IF 9.297
Ya Gao,Tong Yue,Wei Sun,Dongdong He,Chenglong Lu,Xinzhuang Fu
Acid recovering and iron recycling from pickling waste acid are the desired goal of the steel mills for current ecological requirements and economic benefit. This study proposed a novel method to treatment the pickling waste acid using extraction separation of ferric chloride and hydrochloric acid , following by the spray pyrolysis of ferric chloride stripping liquor. Comparing the Ruthner method, the significant technical advantages of this method is the lower treatment load and operating costs for the spray pyrolysis process, attributing to the reuse of most hydrochloric acid without iron powder neutralizing. Different extractants (TBP, CYC, IA, OA, and PA) are compared to extract ferric ion from high-concentration hydrochloric acid solution and the optimum conditions are researched. Spectroscopic analysis is performed to characterize iron state in extractants. For the stripped solution, spray pyrolysis is employed to produce high-purity Fe 2 O 3 fine particles, meanwhile hydrochloric acid is recovered for following pickling procedure. The results showed that the effect of CYC under lower O/A ratio was better than that of TBP, and the opposite occurred at higher ratios. Three-stage extraction efficiency can reach over 80% at O/A = 2:1. The final O/A ratio of 1:1 was chosen for the stripping of iron-loaded extractants. Raman and UV–visible found that it was [FeCl 4 ] - anion that existed in Fe-loaded TBP and CYC. Spray pyrolysis at 1000 °C can obtain fine pure Fe 2 O 3 and hydrochloric acid. Eventually, a feasible technological process was put forward to recycle all chemicals and achieve zero emission of water and solid waste in the whole process.
研究领域:
化学工程
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环境科学
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2018
·
IF 3.779
Cuncai Lv,Zhipeng Huang,Qianpeng Yang,Chi Zhang
A promising non-precious metal electrocatalyst having efficient activity in hydrogen evolution reaction (HER) is a crucial for environmentally benign energy production. Molybdenum sulfide (MoS 2 ) is expected to be a promising alternative to noble-metal-based electrocatalysts, but its catalytic performance is inherently limited by sparse catalytic edge sites and poor electrical conductivity . Herein, we propose a convenient and scalable approach to construct few-layer tiny MoS 2 nanoflakes anchored on porous carbon (MoS 2 @C), consisting of ultrasonic spray pyrolysis (USP) followed by sulfurization. The MoS 2 @C exhibits superior HER performance with a low overpotential of 133 mV at a current density of 10 mA cm −2 , and a small Tafel slope of 66 mV dec −1 . The activity is ascribed to abundant defects in few-layer tiny MoS 2 nanoflakes, as well as enhanced electron transport from porous carbon support to active sites.
研究领域:
材料科学
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Yang Li,Guoxun Zeng,Guoqiang Yang,Qibai Wu,Haiyan Zhang,Wenwu Li,Yannan Qian
Hydrophilic coatings have received considerable attentions in recent years. This study investigates an ATO/potassium silicate hydrophilic film based on antimony doped tin oxide (ATO) and potassium silicate (PS) which deposited on aluminum sheets by twice spray pyrolysis . For comparison, four groups of samples including aluminum sheets (Al), aluminum sheets deposited with ATO film (Al/ATO), aluminum sheets deposited with potassium silicate film (Al/PS) and aluminum sheets deposited with both ATO and potassium silicate films (Al/ATO/PS) have been used for experiments. The morphologies, phase structures and chemical compositions of four samples have been characterized using FE-SEM, AFM , XRD and XPS . The hydrophilic, anticorrosive, thermal conductive and electrical resistive properties of the four samples have been studied in detail. The results show clearly that smooth PS film possesses good hydrophilicity and the water contact angle of ATO/PS film maintains below 17° after being exposed in air for 1 month. Moreover, the ATO/PS film shows lower corrosion current density comparing with other samples, revealing its excellent corrosion resistance property. The difference in the thermal conductivity values of the four samples is not significant. And the thermal conductivity is slightly increased by 4.0% for Al/ATO/PS, compared to Al/PS. These results indicate that ATO/PS film has superior hydrophilic performance, corrosion resistance and thermal conductivity than the individual potassium silicate film and ATO film.
研究领域:
材料科学
·
表面工程
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产品关联
DOI
高影响因子
Nano Research
·
2018
·Vol. 11
·期 3
·1490-1499
·
IF 7.994
Du Haoran,Huang Kuangfu,Li Min,Xia Yuanyuan,Sun Yixuan,Yu Mengkang,Geng Baoyou
Porous hollow Co 3 O 4 microspheres have been synthesized from a mixed cobalt nitrate and urea solution through spray pyrolysis followed by calcination at 600 °C in air. This porous hollow Co 3 O 4 is assembled by nanoparticles and exhibits variable porosity depending on the amount of gas in the system. In pyrolysis process, urea continuously decomposes into gaseous components, which act as a template to control the porous structure. The amount of gas escaping from precursor droplets can directly influence the porosity of the microspheres and the size of the nanoparticles controlled by the ratio of urea to cobalt nitrate. Electrochemical measurements show that the performance of the porous hollow Co 3 O 4 microspheres is related to the porosity and size of the nanoparticles. The sample with optimal porosity delivers a high first charge capacity of 1,417.9 mAh·g −1 at 0.2C (1C = 890 mA·g −1 ), and superior charge cycle performance of 1,012.7 mAh·g −1 after 100 cycles. In addition, the optimized material displays satisfactory rate performance of 1,012.4 mAh·g −1 at 1C after 50 cycles and 881.3 mAh·g −1 at 2C after 300 cycles. Superior charge/discharge capacity, excellent rate performance and high yield achieved in this study is promising for the development of high-performance Co 3 O 4 anode materials for lithium-ion batteries.
研究领域:
材料科学
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能源存储技术
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产品关联
DOI
高影响因子
Nanoscale Research Letters
·
2020
·Vol. 15
·期 1
·1-10
·
IF 3.578
Xiao Chenhong,Zhou Zhongyuan,Li Liujing,Wu Shaolong,Li Xiaofeng
Hematite (α-Fe 2 O 3 ) material is regarded as a promising candidate for solar-driven water splitting because of the low cost, chemical stability, and appropriate bandgap; however, the corresponding system performances are limited by the poor electrical conductivity, short diffusion length of minority carrier, and sluggish oxygen evolution reaction. Here, we introduce the in situ Sn doping into the nanoworm-like α-Fe 2 O 3 film with ultrasonic spray pyrolysis method. We show that the current density at 1.23 V vs. RHE ( J ph@1.23V ) under one-sun illumination can be improved from 10 to 130 μA/cm 2 after optimizing the Sn dopant density. Moreover, J ph@1.23V can be further enhanced 25-folds compared to the untreated counterpart via the post-rapid thermal process (RTP), which is used to introduce the defect doping of oxygen vacancy. Photoelectrochemical impedance spectrum and Mott-Schottky analysis indicate that the performance improvement can be ascribed to the increased carrier density and the decreased resistances for the charge trapping on the surface states and the surface charge transferring into the electrolyte. X-ray photoelectron spectrum and X-ray diffraction confirm the existence of Sn and oxygen vacancy, and the potential influences of varying levels of Sn doping and oxygen vacancy are discussed. Our work points out one universal approach to efficiently improve the photoelectrochemical performances of the metal oxide semiconductors.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）