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Characterization of Microstructure and Stability of Precipitation in SIMP Steel Irradiated with Energetic Fe Ions
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作者 方雪松 申铁龙 +4 位作者 崔明焕 金鹏 李炳生 朱亚滨 王志光 《Chinese Physics Letters》 SCIE CAS CSCD 2017年第11期57-60,共4页
A type of home-made reduced activation martensitic steel, high silicon (SIMP) steel, is homogeneously irradiated with energetic Fe ions to the doses of 0.1, 0.25 and 1 displacement per atom (dpa), respectively, at... A type of home-made reduced activation martensitic steel, high silicon (SIMP) steel, is homogeneously irradiated with energetic Fe ions to the doses of 0.1, 0.25 and 1 displacement per atom (dpa), respectively, at 300℃ and i dpa, at 400℃. MicrostructurM changes are investigated in detail by transmission electron microscopy with cross-section technique. Interstitial defects and defect dusters induced by Fe-ion irradiation are observed in ali the specimens under different conditions. It is found that with increasing irradiation temperature, size of defect clusters increases while the density drops quickly. The results of element chemical mapping from the STEM images indicate that the Si element enrichment and Ta element depletion occur inside the precipitates in the matrix of SIMP steel irradiated to a dose of 1 dpa at 300℃. Correlations between the microstructure and irradiation conditions are briefly discussed. 展开更多
关键词 Characterization of Microstructure and Stability of Precipitation in SIMP Steel Irradiated with Energetic fe ions fe
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Effect of Fe ion implantation on tribological properties and Raman spectra characteristics of diamond-like carbon film
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作者 JIAWen-Bao SUNZhuo 《Nuclear Science and Techniques》 SCIE CAS CSCD 2004年第2期95-98,共4页
Fe ions in the fluence range of 2×1015 to 1×1017 cm-2 were implanted into diamond-like carbon (DLC) thin film of 100 nm thick, which were deposited on silicon substrate by plasma enhanced chemical vapor depo... Fe ions in the fluence range of 2×1015 to 1×1017 cm-2 were implanted into diamond-like carbon (DLC) thin film of 100 nm thick, which were deposited on silicon substrate by plasma enhanced chemical vapor deposition. Effects of Fe ion implantation on microstructure and friction coefficient of the DLC were studied. With increasing Fe ion fluence, friction coefficient of the DLC film increased as compared with that of DLC without implantation, and then decreased. The Raman spectra characteristics also show a dependence on the Fe ion fluence. With increasing the ion fluence, the sp2 bonding increased in the DLC film, resulting in the decrease of friction coefficient of the film af- ter implantation. Substantial surface roughness was also measured. 展开更多
关键词 铁离子 类金刚石碳薄膜 摩擦学性质 Raman光谱特性 物理气相沉积 等离子体增强化学气相沉积
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Killing two birds with one stone:Enhancing the photoelectrochemical water splitting activity and stability of BiVO_(4)by Fe ions association
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作者 Hailang Deng Abebe Reda Woldu +5 位作者 Abdul Qayum Zanling Huang Weiwei Zhu Xiang Peng Paul K.Chu Liangsheng Hu 《Chinese Chemical Letters》 SCIE CAS 2024年第12期154-159,共6页
Bi VO_(4)is a promising semiconducting photoanode for photoelectrochemical(PEC)water splitting due to its suitable bandgap.However,the dissolution of V^(5+)and sluggish reaction kinetics at the surface in the oxygen e... Bi VO_(4)is a promising semiconducting photoanode for photoelectrochemical(PEC)water splitting due to its suitable bandgap.However,the dissolution of V^(5+)and sluggish reaction kinetics at the surface in the oxygen evolution reaction(OER)limit its applications.Herein,we report a convenient strategy to change the microenvironment by adding Fe(Ⅲ)into the electrolyte.During the PEC process,Fe(Ⅲ)ions not only improve the current density,but also show excellent stability toward Bi VO_(4).Consequently,the current increases by more than 1.7 times compared to that without Fe(Ⅲ).Photoelectrochemical,morphological,and structural characterizations reveal that the FeOOH co-catalyst produced in situ on the Bi VO_(4)photoanode by cyclical formation of the intermediates at the electrode/electrolyte interface during OER accelerates the OER kinetics and prevents photo-corrosion by suppressing the dissolution of V^(5+).The results reveal a new strategy for the multifunctional modification of photoanodes for efficient solar conversion. 展开更多
关键词 Photoelectrochemical water splitting Bi VO_(4)photoanodes fe(Ⅲ)ions Oxygen evolution reaction Dynamic changes
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Fe-Beta zeolite for selective catalytic reduction of NO_x with NH_3:Influence of Fe content 被引量:12
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作者 夏岩 詹望成 +2 位作者 郭耘 郭杨龙 卢冠忠 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2016年第12期2069-2078,共10页
Fe doped Beta zeolite with different Fe contents were prepared by ion exchange by changing the volume or the concentration of a Fe salt solution. For a particular mass of Fe salt precursor, the concentration of the me... Fe doped Beta zeolite with different Fe contents were prepared by ion exchange by changing the volume or the concentration of a Fe salt solution. For a particular mass of Fe salt precursor, the concentration of the metal salt solution during ion exchange influenced the ion exchange capacity of Fe, and resulted in different activities of the Fe-Beta catalyst. Fe-Beta catalysts with the Fe contents of (2.6, 6.3 and 9) wt% were synthesized using different amounts of 0.02 mol/L Fe salt solution. These catalysts were studied by various characterization techniques and their NH3-SCR activities were evaluated. The Fe-Beta catalyst with the Fe content of 6.3 wt% exhibited the highest activity, with a temperature range of 202-616℃ where the NOx conversion was 〉 80%. The Fe content in Beta zeolite did not influence the structure of Beta zeolite and valence state of Fe. Compared with the Fe-Beta catalysts with low Fe content (2.6 wt%), Fe-Beta catalysts with 6.3 wt% Fe content possessed more isolated Fe3. active sites which led to its higher NH3-SCR activity. A high capacity for NH3 and NO adsorption, and a high activity for NO oxidation also contributed to the high NH3-SCR activity of the Fe-Beta catalyst with 6.3 wt%. However, when the Fe content was further increased to 9.0 wt%, the amount of FexOy nanoparticles increased while the amount of isolated Fe3+ active sites was unchanged, which promoted NH3 oxidation and decreased the NH3-SCR activity at high temperature. 展开更多
关键词 Beta zeoliteSelective catalytic reduction fe contentfe species ion exchange
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Tailoring Iron-Ion Release of Cellulose-Based Aerogel-Coated Iron Foam for Long-Term High-Power Microbial Fuel Cells
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作者 Zhengyang Ni Huitao Yu +6 位作者 Haoran Wang Mengmeng Qin Feng Li Hao Song Xiangyu Chen Yiyu Feng Wei Feng 《Transactions of Tianjin University》 EI CAS 2024年第5期436-447,共12页
The presence of iron(Fe) has been found to favor power generation in microbial fuel cells(MFCs). To achieve long-term power production in MFCs, it is crucial to effectively tailor the release of Fe ions over extended ... The presence of iron(Fe) has been found to favor power generation in microbial fuel cells(MFCs). To achieve long-term power production in MFCs, it is crucial to effectively tailor the release of Fe ions over extended operating periods. In this study, we developed a composite anode(A/IF) by coating iron foam with cellulose-based aerogel. The concentration of Fe ions in the anode solution of A/IF anode reaches 0.280 μg/mL(Fe^(2+) vs. Fe^(3+) = 61%:39%) after 720 h of aseptic primary cell operation. This value was significantly higher than that(0.198 μg/mL, Fe^(2+) vs. Fe^(3+) = 92%:8%) on uncoated iron foam(IF), indicating a continuous release of Fe ions over long-term operation. Notably, the resulting MFCs hybrid cell exhibited a 23% reduction in Fe ion concentration(compared to a 47% reduction for the IF anode) during the sixth testing cycle(600-720 h). It achieved a high-power density of 301 ± 55 mW/m^(2) at 720 h, which was 2.62 times higher than that of the IF anode during the same period. Furthermore, a sedimentary microbial fuel cell(SMFCs) was constructed in a marine environment, and the A/IF anode demonstrated a power density of 103 ± 3 mW/m^(2) at 3240 h, representing a 75% improvement over the IF anode. These findings elucidate the significant enhancement in long-term power production performance of MFCs achieved through effective tailoring of Fe ions release during operation. 展开更多
关键词 Microbial fuel cells Coating fe ions Tailor release LONG-TERM
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Effect of Fe(Ⅲ) on the bromate reduction by humic substances in aqueous solution 被引量:4
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作者 XIE Li SHANG Chii ZHOU Qi 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2008年第3期257-261,共5页
Humic substances are ubiquitous redox-active organic compounds of environment. In this study, experiments were conducted to determine the reduction capacity of humic acid in the man-ix of bromate and Fe(Ⅲ) solution... Humic substances are ubiquitous redox-active organic compounds of environment. In this study, experiments were conducted to determine the reduction capacity of humic acid in the man-ix of bromate and Fe(Ⅲ) solutions and the role of Fe(Ⅲ) in this redox process. The results showed that the humic acid regenerated Fe(Ⅱ) and reduced bromate abiotically. The addition of Fe(Ⅲ) could accelerate the bromate reduction rate by forming humic acid-Fe(Ⅲ) complexes. Iron species acts as electron mediator and catalyst for the bromate reduction by humic acid, in which humic acid transfers electrons to the complexed Fe(Ⅲ) to form Fe(Ⅱ), and the regenerated Fe(Ⅱ) donate the electrons to bromate. The kinetics study on bromate reduction further indicated that bromate reduction by humic acid-Fe(Ⅲ) complexes is pH dependent. The rate decreased by 2-fold with the increase in solution pH by one unit. The reduction capacity of Aldrich humic acid was observed to be lower than that of humic acid or natural organic matter of Suwanne River, indicating that such redox process is expected to occur in the environment. 展开更多
关键词 humic acid fe(Ⅲ) ion bromate reduction electron mediator
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Preparation of TiO_2/activated carbon with Fe ions doping photocatalyst and its application to photocatalytic degradation of reactive brilliant red K2G 被引量:4
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作者 LI YouJi,LI Jing,MA MingYuan,OUYANG YuZhu & YAN WenBin College of Chemistry and Chemical Engineering,Jishou University,Jishou 416000,China 《Science China Chemistry》 SCIE EI CAS 2009年第8期1113-1119,共7页
Titanium dioxide coated on activated carbon(AC) with Fe ions doping(Fe-TiO2/AC) composite was prepared by an improved sol-gel method.The photocatalytic activities were tested by photocatalytic degradation of reactive ... Titanium dioxide coated on activated carbon(AC) with Fe ions doping(Fe-TiO2/AC) composite was prepared by an improved sol-gel method.The photocatalytic activities were tested by photocatalytic degradation of reactive brilliant red K2G in solution.The results show that in comparison with the agglomeration of pure TiO2,the TiO2 nanoparticles are well dispersed in the AC matrix,of which sizes are decreased with Fe ions doping.Additionally,the iron species on TiO2 of composite are Fe2O3 and FeO,which do not affect the crystalline structures of TiO2 nanoparticles.The AC matrix and iron doping content influence the fluorescence intensity of composite due to their effects on recombination probability of hole-electron pairs.Compared with TiO2,0.3% Fe-TiO2,TiO2/AC,0.5% Fe-TiO2/AC and 0.1% Fe-TiO2/AC,the 0.3% Fe-TiO2/AC shows the highest photoactivity with the complete mineralization of K2G for finite time due to the optimum Fe ions content and AC matrix.Furthermore,the kinetic constant(k=0.0229 min-1) of 0.3% Fe-TiO2/AC composite is more than the sum of both TiO2/AC(0.0154 min-1) and 0.3% Fe-TiO2(0.0057 min-1) because coexistence of the AC and Fe ions has an enlarging effect on improving the photoactivity of TiO2. 展开更多
关键词 TiO2 nanoparticles fe ionS activated carbon photocatalysis reactive BRILLIANT red K2G
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Researches on the Growth Habit and Optical Properties of Fe^(3+) Ion Doped KDP Crystal 被引量:2
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作者 王波 房昌水 +4 位作者 王圣来 孙洵 顾庆天 许心光 李毅平 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 北大核心 2007年第10期1211-1217,共7页
During the process of KDP crystal growth, metal ions strongly affect the growth habit and optical properties of KDP single crystal. In this paper, KDP crystals were grown from an aqueous solution doped with different ... During the process of KDP crystal growth, metal ions strongly affect the growth habit and optical properties of KDP single crystal. In this paper, KDP crystals were grown from an aqueous solution doped with different concentration of Fe^3+ dopant by traditional temperaturereduction method and "point-seed" rapid growth method. Furthermore, we examined the light scatter and measured the transmission of these KDP crystals. It is found that the dopant of Fe^3+ ion can improve the stability of the KDP growth solution when its concentration is less than 30 ppm. The effects of Fe^3+ ion on the growth habit and optical properties of KDP crystal are also obvious. 展开更多
关键词 fe^3+ ion 10P single crystal optical property light scatter
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Fabrication and adsorption property of novel adsorbent for potential application to wastewater with Fe(Ⅲ) ions 被引量:1
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作者 朱卫霞 宋航 +1 位作者 贾春梅 姚舜 《Journal of Central South University》 SCIE EI CAS 2014年第7期2832-2836,共5页
The spherical macroporous cellulose(SMC) was fabricated using medical absorbent cotton as raw material and nano CaCO3 as porogenic agents.And then,the phenylglycine was grafted onto the SMC to obtain the novel spheric... The spherical macroporous cellulose(SMC) was fabricated using medical absorbent cotton as raw material and nano CaCO3 as porogenic agents.And then,the phenylglycine was grafted onto the SMC to obtain the novel spherical macroporous cellulose derivative adsorbent(PSMC).FT-IR and scanning electron microscope(SEM) were employed to characterize the adsorbents and Fe3+ ions served as model solute to evaluate the adsorption property of the adsorbents.The experimental results show that the amount of porogenic agents and the value of pH have obvious influence on adsorption capacity of the adsorbents.The data of adsorption kinetic and isotherm display that the adsorbents possess excellent equilibrium adsorption capacity(348.94 mg/g) and have a bright prospect and considerable potential in the treatment of Fe3+ ions in wastewater. 展开更多
关键词 cellulose modified with phenylglycine adsorption fe(Ⅲ) ions porogenic agent kinetic and isotherm
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ZnSO_(4)-FeSO_(4)溶液120~180℃的矿化沉铁行为及机理
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作者 彭晓华 陆占清 +5 位作者 陈国木 周东风 魏昶 李兴彬 杨博 邓志敢 《中国有色金属学报》 EI CAS CSCD 北大核心 2024年第11期3843-3855,共13页
针对湿法炼锌含Zn^(2+)130 g/L、Fe^(2+)15 g/L的高锌含铁溶液矿化沉铁过程机理及铁物相转变行为,本文于120~180℃下开展了矿化沉铁行为及机理研究,深入研究了温度、氧分压、搅拌转速和反应时间对亚铁离子矿化沉铁行为的影响。结果表明... 针对湿法炼锌含Zn^(2+)130 g/L、Fe^(2+)15 g/L的高锌含铁溶液矿化沉铁过程机理及铁物相转变行为,本文于120~180℃下开展了矿化沉铁行为及机理研究,深入研究了温度、氧分压、搅拌转速和反应时间对亚铁离子矿化沉铁行为的影响。结果表明:温度150℃、氧分压0.3~0.4 MPa、搅拌转速500 r/min以及反应时间180 min为合理的矿化沉铁条件。在此条件下,沉铁率为91.33%,沉铁后液中Fe^(2+)和全Fe浓度分别降至0.10 g/L和1.30 g/L,同时可产出Fe、Zn和S含量分别为61.35%、1.01%和1.61%的高品位赤铁矿。XRD和SEM分析结果表明:当反应温度低于130℃时,沉铁产物物相由针铁矿和羟基氧化铁组成,高于130℃,主要为赤铁矿。Fe^(2+)矿化沉铁伴随着复杂的氧化、水解、脱水、缩合等反应过程。XPS分析结果表明,沉铁产物为羟基氧化铁(Fe_(2-x/3)(OH)_xO_(3-x)),其脱水(H_(2)O)和脱羟基(—OH)不完全导致Fe空位;Zn^(2+)以间隙或原子替代的方式存在于沉铁产物晶体内,并与O^(2-)配位;SO_(4)^(2-)与晶体晶面的Fe(Ⅲ)络合(FeSO_(4)^(+)),以硫酸铁(Fe_(2)(SO_(4))_(3))的形式存在,硫酸根几乎均匀地分布于赤铁矿颗粒内部及表面。 展开更多
关键词 湿法炼锌 亚铁离子 矿化沉铁 羟基氧化铁 针铁矿 赤铁矿
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Distinctive electrochemical performance of novel Fe-based Li-rich cathode material prepared by molten salt method for lithium-ion batteries 被引量:1
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作者 Taolin Zhao Rixin Ji +5 位作者 Hedi Yang Yuxia Zhang Xiuguo Sun Yanting Li Li Li Renjie Chen 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2019年第6期37-45,共9页
For constructing next-generation lithium-ion batteries with advanced performances,pursuit of highcapacity Li-rich cathodes has caused considerable attention.So far,the low discharge specific capacity and serious capac... For constructing next-generation lithium-ion batteries with advanced performances,pursuit of highcapacity Li-rich cathodes has caused considerable attention.So far,the low discharge specific capacity and serious capacity fading are strangling the development of Fe-based Li-rich materials.To activate the extra-capacity of Fe-based Li-rich cathode materials,a facile molten salt method is exploited using an alkaline mixture of LiOH–LiNO3–Li2O2 in this work.The prepared Li1.09(Fe0.2Ni0.3Mn0.5)0.91O2 material yields high discharge specific capacity and good cycling stability.The discharge specific capacity shows an upward tendency at 0.1 C.After 60 cycles,a high reversible specific capacity of ~250 m Ah g-1is delivered.The redox of Fe3+/Fe4+and Mn3+/Mn4+are gradually activated during cycling.Notably,the redox reaction of Fe2+/Fe3+can be observed reversibly below 2 V,which is quite different from the material prepared by a traditional co-precipitation method.The stable morphology of fine nanoparticles(100–300 nm)is considered benefiting for the distinctive electrochemical performances of Li1.09(Fe0.2Ni0.3Mn0.5)0.91O2.This study demonstrates that molten salt method is an inexpensive and effective approach to activate the extra capacity of Fe-based Li-rich cathode material for high-performance lithium-ion batteries. 展开更多
关键词 LITHIUM-ion batteries fe-BASED material Li-rich cathode Molten salt High capacity
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REDUCTION OF FERRIC IRON IN THE TITANIUM SULFATE SOLUTION BY THE ION EXCHANGE MEMBRANE PRIMARY CELL METHOD 被引量:1
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作者 Li Qinggang Zhou Kanggen Zhang Guiqing Zhang Qixiou (Department of Metallurgical Science and Engineering, Central South University of Technology, Changsha 410083,China) 《Journal of Central South University》 SCIE EI CAS 1999年第2期90-94,共5页
In the production process of titanium dioxide with sulfuric acid, the contamination of the titanium sulfate solution (the ilmenite leaching solution) in the Fe 3+ reduction stage by iron scraps is a practical problem ... In the production process of titanium dioxide with sulfuric acid, the contamination of the titanium sulfate solution (the ilmenite leaching solution) in the Fe 3+ reduction stage by iron scraps is a practical problem because it is difficult to guarantee the quality of the iron scraps. In this research, a new method, called the ion exchange membrane primary cell method, for reduction of Fe 3+ in the titanium sulfate solution has been advanced. The positive compartment of the primary cell consists of lead (copper) electrode and the titanium sulfate solution, and the negative compartment consists of iron electrode and acidic FeSO 4 solution. The anion ion exchange membrane is used as the diaphragm between two compartments. Fe 3+ in the titanium sulfate solution is reduced by the electric discharge of the primary cell. The effects of temperature, stirring strength of the solution and membrane area on the reduction rate have been investigated. The experimental result shows that the optimum current density can be higher than 100 A/m 2. 展开更多
关键词 PRIMARY cell ion EXCHANGE MEMBRANE fe 3+ REDUCTion TITANIUM dioxide
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Photocatalytic Activity of Nanosized TiO_2 Enhanced by co-doping with Fe^(3+) and Nd^(3+) Ions
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作者 傅平丰 赵卓 王敬欣 《Journal of Rare Earths》 SCIE EI CAS CSCD 2007年第S2期17-21,共5页
In this study, nanosized TiO2 co-doped with Fe3+ and Nd3+ ions was synthesized via a sol-gel method. The metallic ion doped TiO2 was thoroughly characterized with XRD and UV-vis, and the photocatalytic activity was ev... In this study, nanosized TiO2 co-doped with Fe3+ and Nd3+ ions was synthesized via a sol-gel method. The metallic ion doped TiO2 was thoroughly characterized with XRD and UV-vis, and the photocatalytic activity was evaluated by degrading methylene blue (MB) solution. The results indicated that TiO2 crystalline size was reduced and phase transformation of anatase to rutile was suppressed as the content of doped Nd3+ ion increased in the co-doped TiO2. The UV-vis spectra of co-doped TiO2 seemed to simply overlay two spectra of single metal doped TiO2, and had significantly increased absorbance in the ranges of 400~500 nm, 565~600 nm and 730~765 nm as compared to pure TiO2. The photocatalytic activity of co-doped TiO2 was obviously enhanced, and raised about 30% compared to that of pure TiO2 as doped Nd3+ content was 0.15% and Fe3+ content was 0.05%, respectively. The enhanced catalytic activity was attributed to a synergistic effect of two doped ions, where doped Fe3+ ion inhibited the recombination of photogenerated electron and hole, and Nd3+ ion brought more surface carboxyl to promote the degradation reaction. 展开更多
关键词 titanium dioxide fe3+ ion Nd3+ ion metallic ion doping photocatalytic activity
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STUDY OF SURFACE RESISTIVITY MODIFICATION IN Al_2O_3 CERAMIC IMPLANTED BY Fe^(2+)
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作者 李世普 任卫 +2 位作者 王国梅 邢宁 陈晓明 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 1991年第2期19-26,共8页
The implanted ion range, the depth profile and the film sttucture of the implanted layer were studied; the carrier concentration and the mobility were measured; the conductivity mechanism of the film implanted Fe into... The implanted ion range, the depth profile and the film sttucture of the implanted layer were studied; the carrier concentration and the mobility were measured; the conductivity mechanism of the film implanted Fe into Al_2O_3 ceramic was discussed. The conclusion is that the implanted Fe^(2+) ions move into Al_2O_3 lattice and replace Al^(3+) to form subs- titution impurities so that the ion implanted lat- tice, as compared with the original one, presents an effective negative charge which forms a negative charge center. A vacancy is bound arround it, and an acceptor is introduced in the forbidden band. 展开更多
关键词 Al_2O_3 ceramic fe^(2+) ion Surface resistivity
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Performance Evaluation of the Fe-IR-120(Na)-DEHPA Impregnated Resin in the Removal Process of As(V) from Aqueous Solution
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作者 Mihaela Ciopec Adina Negrea +3 位作者 Lavinia Lupa Comeliu Davidescu Petru Negrea Paula Sfarloaga 《材料科学与工程(中英文B版)》 2011年第4期421-432,共12页
关键词 DEHPA 浸渍树脂 水溶液 LANGMUIR模型 IR NA 搬运过程 绩效评价
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煅烧温度对钠离子电池O3-NaNi_(0.33)Fe_(0.33)Mn_(0.33)O_(2)正极材料的影响
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作者 刘冬梅 何一芃 +2 位作者 余凌智 周旺 陈杰 《现代化工》 CAS CSCD 北大核心 2024年第12期176-180,187,共6页
O3型正极材料因较高的理论比容量成为钠离子电池正极材料研究的热点。采用共沉淀法制备Ni_(0.33)Fe_(0.33)Mn_(0.33)(OH)_(2)前驱体并配钠煅烧为O3-NaNi_(0.33)Fe_(0.33)Mn_(0.33)O_(2)正极材料,探究煅烧温度对该正极材料物相结构与电... O3型正极材料因较高的理论比容量成为钠离子电池正极材料研究的热点。采用共沉淀法制备Ni_(0.33)Fe_(0.33)Mn_(0.33)(OH)_(2)前驱体并配钠煅烧为O3-NaNi_(0.33)Fe_(0.33)Mn_(0.33)O_(2)正极材料,探究煅烧温度对该正极材料物相结构与电化学性能的影响。结果表明,煅烧温度影响正极材料表面钠残渣含量,进而影响其电化学性能。2.0~4.0 V的电压范围内,850℃下制备的NaNi_(0.33)Fe_(0.33)Mn_(0.33)O_(2)正极材料表现出最优电化学性能,1 C下循环100次后容量保持率为71.08%,5 C下放电比容量为91.67 mAh/g。 展开更多
关键词 钠离子电池 Ni/fe/Mn基正极材料 表面残碱
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煅烧温度对钠离子电池P2-Na_(0.67)Ni_(0.1)Fe_(0.1)Mn_(0.8)O_(2)正极材料性能的影响
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作者 吴奇峰 谭磊 +3 位作者 任延杰 邹康宇 宁天翔 李灵均 《中国有色金属学报》 EI CAS CSCD 北大核心 2024年第6期1884-1892,共9页
层状氧化物材料因其容量高被认为是钠离子电池(SIBs)的候选正极材料,其中,锰基P2型层状氧化物因成本低、稳定性好,是具有发展前景的钠离子电池层状正极材料。本文采用固相烧结法制备一种P2-Na_(0.67)Ni_(0.1)Fe_(0.1)Mn_(0.8)O_(2)正极... 层状氧化物材料因其容量高被认为是钠离子电池(SIBs)的候选正极材料,其中,锰基P2型层状氧化物因成本低、稳定性好,是具有发展前景的钠离子电池层状正极材料。本文采用固相烧结法制备一种P2-Na_(0.67)Ni_(0.1)Fe_(0.1)Mn_(0.8)O_(2)正极材料,研究煅烧温度对正极材料性能的影响。结果表明:在875℃下获得的Na_(0.67)Ni_(0.1)Fe_(0.1)Mn_(0.8)O_(2)正极材料具有结晶良好的P2纯相,表现出优异的电化学性能。在1.5~4.3 V的电压范围内,0.05C下所制备正极材料的初始放电容量为232 mA·h/g,且循环100次后,正极材料的容量保持率为69.5%。 展开更多
关键词 钠离子电池 Ni/fe/Mn基正极材料 煅烧温度 电化学性能
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Preparation and electrochemical performance of Li_2Mn_(0.5)Fe_(0.5)SiO_4 cathode material with sol-gel method for lithium ion batteries
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作者 胡传跃 郭军 +1 位作者 文瑾 彭秧锡 《Journal of Central South University》 SCIE EI CAS 2014年第4期1285-1289,共5页
Li2Fe0.5Mn0.5SiO4 material was synthesized by a citric acid-assisted sol-gel method. The influence of the stoichiometric ratio value of n(citric acid) to n(Fe2+-Mn2+) on the electrochemical properties of Li2Fe0.5Mn0.5... Li2Fe0.5Mn0.5SiO4 material was synthesized by a citric acid-assisted sol-gel method. The influence of the stoichiometric ratio value of n(citric acid) to n(Fe2+-Mn2+) on the electrochemical properties of Li2Fe0.5Mn0.5SiO4 was studied. The final sample was identified as Li2Fe0.5Mn0.5SiO4 with a Pmn21 monoclinic structure by X-ray diffraction analysis. The crystal phases components and crystal phase structure of the Li2Fe0.5Mn0.4SiO4 material were improved as the increase of the stoichiometric ratio value of n(citric acid) to n(Fe2+-Mn2+). Field-emission scanning electron microscopy verified that the Li2Fe0.5Mn0.5SiO4 particles are agglomerates of Li2Fe0.5Mn0.5SiO4 primary particles with a geometric mean diameter of 220 nm. The Li2Fe0.5Mn0.5SiO4 sample was used as an electrode material for rechargeable lithium ion batteries, and the electrochemical measurements were carried out at room temperature. The Li2Fe0.5Mn0.5SiO4 electrode delivered a first discharge capacity of 230.1 mAh/g at the current density of 10 mA/g in first cycle and about 162 mAh/g after 20 cycles at the current density of 20 mA/g. 展开更多
关键词 lithium ion battery Li2fe0.5Mn0.5SiO4 citric acid assisted sol-gel method cathode
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Synthesis and Characterization of a New Fe_2O_3 Pillared Triple-layered Perovskite KSr_2Nb_3O_(10)
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作者 张辉 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2003年第4期35-37,共3页
A n-Hexyl NH 3Sr 2Nb 3O 10 is obtained by the stepwise ion-exchange reaction,then is dispersed in aqueous solution of trinuclear acetato-hydroxo iron(III) nitrate,[Fe 3(OCOCH 3) 7OH·2H 2O]NO 3,and the ... A n-Hexyl NH 3Sr 2Nb 3O 10 is obtained by the stepwise ion-exchange reaction,then is dispersed in aqueous solution of trinuclear acetato-hydroxo iron(III) nitrate,[Fe 3(OCOCH 3) 7OH·2H 2O]NO 3,and the interlayer potassium cations of the perovskite niobate are exchanged with the partially hydrolyzed trinuclear acetato complex ions.On heating,the exchanged complex ions are converted into iron oxide pillars which keep the perovskite sheets apart.The product is characterized by XRD,SEM,EDAX and surface area measurement respectively. 展开更多
关键词 fe 2O 3 pillar perovskite structure ion-exchange X-ray diffraction
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静电纺丝法制备SnSbCuFeZn高熵合金/碳纳米纤维复合负极材料 被引量:1
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作者 辛玉 潘石 +2 位作者 聂淑晴 缪畅 肖围 《矿冶工程》 CAS 北大核心 2024年第4期61-66,共6页
采用静电纺丝技术,结合煅烧工艺,将SnSbCuFeZn高熵合金纳米颗粒均匀地锚定在导电互联的碳纳米纤维中,成功制备了SnSbCuFeZn@CNFs锂离子电池复合负极材料。结果表明,煅烧温度对材料的物相组成和形貌特征有重要影响,且直接影响SnSbCuFeZn... 采用静电纺丝技术,结合煅烧工艺,将SnSbCuFeZn高熵合金纳米颗粒均匀地锚定在导电互联的碳纳米纤维中,成功制备了SnSbCuFeZn@CNFs锂离子电池复合负极材料。结果表明,煅烧温度对材料的物相组成和形貌特征有重要影响,且直接影响SnSbCuFeZn高熵合金纳米颗粒的晶相、尺寸和分布,决定SnSbCuFeZn@CNFs电极的电化学性能。其中SnSbCuFeZn@CNFs-900电极展现出优良综合性能:0.1 A/g时,初始放电比容量达1232.8 mA/g,循环200次后可逆放电比容量保持在786.0 mA/g;1.0 A/g时,循环500次后放电比容量仍有433.8 mA/g;2.0 mV/s扫描速度下,赝电容贡献率高达93.37%。 展开更多
关键词 静电纺丝法 SnSbCufeZn高熵合金 碳纳米纤维 负极材料 锂离子电池
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