材料期刊网

±Micro-sized and Nano-sized Fe₃O₄ Particles as Anode Materials for Lithium-ion Batteries

Y.X. Chen L.H. He P.J. Shang Q.L. Tang Z.Q. Liu H.B. Liu L.P. Zhou

材料科学技术（英）

Micro-sized (1030.3§178.4 nm) and nano-sized (50.4±8.0 nm) Fe3O4 particles have been fabricated through hydrogen thermal reduction of α-Fe₂O₃ particles synthesized by means of a hydrothermal process. The morphology and microstructure of the micro-sized and the nano-sized Fe₃O₄ particles were characterized by X-ray diffraction, field-emission gun scanning electron microscopy, transmission electron microscopy and high-resolution electron microscopy. The micro-sized Fe₃O₄ particles exhibit porous structure, while the nano-sized Fe₃O₄ particles are solid structure. Their electrochemical performance was also evaluated. The nano-sized solid Fe₃O₄ particles exhibit gradual capacity fading with initial discharge capacity of 1083.1 mAhg¡1 and reversible capacity retention of 32.6% over 50 cycles. Interestingly, the micro-sized porous Fe₃O₄ particles display very stable capacity-cycling behavior, with initial discharge capacity of 887.5 mAhg¡1 and charge capacity of 684.4 mAhg⁻¹ at the 50th cycle. Therefore, 77.1% of the reversible capacity can be maintained over 50 cycles. The micro-sized porous Fe₃O₄ particles with facile synthesis, good cycling performance and high capacity retention are promising candidate as anode materials for high energy-density lithium-ion batteries.

关键词: Lithium-ion battery , null , null

±Micro-sized and Nano-sized Fe₃O₄ Particles as Anode Materials for Lithium-ion Batteries

Y.X. Chen L.H. He P.J. Shang Q.L. Tang Z.Q. Liu H.B. Liu L.P. Zhou

材料科学技术（英）

Micro-sized (1030.3§178.4 nm) and nano-sized (50.4±8.0 nm) Fe3O4 particles have been fabricated through hydrogen thermal reduction of α-Fe₂O₃ particles synthesized by means of a hydrothermal process. The morphology and microstructure of the micro-sized and the nano-sized Fe₃O₄ particles were characterized by X-ray diffraction, field-emission gun scanning electron microscopy, transmission electron microscopy and high-resolution electron microscopy. The micro-sized Fe₃O₄ particles exhibit porous structure, while the nano-sized Fe₃O₄ particles are solid structure. Their electrochemical performance was also evaluated. The nano-sized solid Fe₃O₄ particles exhibit gradual capacity fading with initial discharge capacity of 1083.1 mAhg¡1 and reversible capacity retention of 32.6% over 50 cycles. Interestingly, the micro-sized porous Fe₃O₄ particles display very stable capacity-cycling behavior, with initial discharge capacity of 887.5 mAhg¡1 and charge capacity of 684.4 mAhg⁻¹ at the 50th cycle. Therefore, 77.1% of the reversible capacity can be maintained over 50 cycles. The micro-sized porous Fe₃O₄ particles with facile synthesis, good cycling performance and high capacity retention are promising candidate as anode materials for high energy-density lithium-ion batteries.

关键词: Lithium-ion battery , null , null

Ion sputter erosion in metallic glass-A response to "Comment on: Homogeneity of Zr(64.13)Cu(15.75)Ni(10.12)Al(10) bulk metallic glass" by L-Y. Chen, Y-W. Zeng, Q-P. Cao, B-J. Park, Y-M. Chen, K. Hono, U. Vainio, Z-L. Zhang, U. Kaiser, X-D. Wang, and J-Z Jiang J. Mater. Res. 24, 3116 (2009)

Journal of Materials Research

The morphology of the dark and bright regions observed by transmission electron microscopy for the Zr(64.13)Cu(15.75)Ni(10.12)Al(10) bulk metallic glass strongly depends on the ion beam parameters used for ion milling. This indicates that the ion beam could introduce surface fluctuation to metallic glasses during ion milling.

关键词: room-temperature

新型杂环化合物在0.5 mol/L H2SO4中对Q235钢的缓蚀性能

陶志华 , 李伟华 , 张胜涛 , 侯保荣

腐蚀与防护

通过失重试验、电化学测试以及量子化学计算方法研究了新型杂环噁二唑化合物1-苯基-2-{5-(1,2,4-三氮唑)-1甲基-(1,3,4-噁二唑)-2-硫}-乙酮(PTOE)在0.5 mol/L H2SO4中对Q235钢(碳钢)的缓蚀性能,并用扫描电镜方法观察了碳钢表面的腐蚀形貌.结果表明,PTOE在0.5 mol/L H2SO4中对Q235钢有高达92.7%的缓蚀作用,能同时抑制碳钢腐蚀的阴、阳极反应过程.碳钢的阻抗值随PTOE浓度增加而增大,其在碳钢表面的吸附符合Langmuir等温式.同时用量子化学中的从头算方法对缓蚀剂的分子结构与缓蚀性能的关系进行了研究.

关键词: 缓蚀剂 , 电化学测试 , 失重 , 量子化学计算

大连饱和水土壤中Q235B钢和L245钢的腐蚀行为

袁赓 , 王树刚 , 章阳 , 黄一

材料保护

对管线钢L245土壤腐蚀的研究目前未见报道.采用失重和电化学阻抗谱测试方法,研究了大连市2种在役燃气管线钢Q235B和L245在饱和水土壤中的腐蚀特性,比较了两者的腐蚀行为.结果表明:Q235B钢的腐蚀电位比L245钢高20mV左右;腐蚀初期两者的阻抗谱均由高频小容抗、中频大容抗和低频小感抗组成,腐蚀后期低频小感抗退化直至消失;随着时间的推移,Q235B钢的腐蚀速率先增大后缓慢减小,L245钢的腐蚀速率先缓慢减小后急剧减小;同等条件下L245钢的耐蚀性要优于Q235B钢.

关键词: 土壤腐蚀 , Q235B钢 , L245钢 , 失重 , 电化学阻抗谱

FeMoB Enhanced Sintering of P/M 316L Stainless Steel

YANG Xia , GUO Shiju

钢铁研究学报(英文版)

Liquidphase enhanced sintering of powder metallurgy (P/M) 316L stainless steel by addition of sintering aids was studied. 2%-8% of prealloyed FeMoB powder with two different particle sizes was added as sintering aids, and the specimens were sintered in vacuum at 1 200-1 350 ℃. The results show that the fine FeMoB powder (5-10 μm) has stronger activated effect. The sintered density increases with the increase in sintering aid content or sintering temperature. Warm compaction has a better effect on the control of dimensional precision of compacts. The prealloyed FeMoB powder deviated from Mo2FeB2 component can also be sintering aid of P/M 316L stainless steel.

关键词: P/M 316L stainless steel;liquidphase sintering;activated sintering;FeMoB;sintering aid

Q195L拉丝用钢成分和工艺的优化

刘涛 , 吴绍杰

钢铁研究 doi:10.3969/j.issn.1001-1447.2005.06.006

介绍新余钢铁有限责任公司在生产Q195L拉丝用钢中存在的主要问题.通过优化钢中的化学成分和炼钢的脱氧工艺,改善了Q195L钢的质量,提高了成材率.

关键词: Q195L , 盘条 , 拉丝

L-苯丙氨酸对Q235钢在硫酸中的缓蚀作用

郑兴文 , 龚敏 , 曾宪光 , 姜春梅 , 卢立娟 , 捷克子沙

表面技术 doi:10.3969/j.issn.1001-3660.2012.03.010

采用电化学方法,研究了L-苯丙氨酸对Q235钢在0.5 mol/L H2SO4溶液中的缓蚀作用及缓蚀机理,分析了其缓蚀剂类型.结果表明:L-苯丙氨酸的缓蚀效率随浓度的增加而增大,而且随着温度的升高,Q235钢表面单个活性位点上吸附的缓蚀剂分子数量增加,缓蚀效率也增大；L苯丙氨酸属于混合抑制型缓蚀剂,作用机理为几何覆盖效应,其在Q235钢表面的吸附为单分子吸附,且吸附规律符合El-Awady动力学模型.

关键词: L-苯丙氨酸 , Q235钢 , 缓蚀剂 , 吸附行为

无金属酞菁、酞菁铜和酞菁锌在1 mol/L H2SO4中对Q235钢的缓蚀作用

赵澎 , 李焰 , 梁强

腐蚀科学与防护技术

通过失重实验、电化学测试和扫描电子显微镜研究了无金属酞菁(H2Pc)、酞菁铜(CuPc)和酞菁锌(ZnPc) 在1 mol/L H2SO4中对碳钢的缓蚀作用.结果表明，3种酞菁化合物的缓蚀能力依次为ZnPc > CuPc > H2Pc，其吸附数据均符合Langmuir等温式；它们能同时抑制碳钢在H2SO4中腐蚀的阴极和阳极过程，电化学阻抗谱显示，为变形的单容抗弧，阻抗值随酞菁化合物浓度增加而增加；表面形貌分析也证明了酞菁化合物的加入提高了碳钢的表面完整性，抑制其腐蚀；量子化学计算结果显示，随着分子的最低空轨道(LUMO)的能量升高，酞菁化合物的缓蚀能力降低.

关键词: 酞菁化合物 , null , null

无金属酞菁、酞菁铜和酞菁锌在1 mol/L H2SO4中对Q235钢的缓蚀作用

赵澎 , 李焰 , 梁强

腐蚀科学与防护技术 doi:10.3969/j.issn.1002-6495.2006.04.001

通过失重实验、电化学测试和扫描电子显微镜研究了无金属酞菁(H2Pc)、酞菁铜(CuPc)和酞菁锌(ZnPc)在1mol/L H2SO4中对碳钢的缓蚀作用.结果表明,3种酞菁化合物的缓蚀能力依次为ZnPc＞CuPc＞H2Pc,其吸附数据均符合Langmuir等温式;它们能同时抑制碳钢在H2SO4中腐蚀的阴极和阳极过程,电化学阻抗谱显示,为变形的单容抗弧,阻抗值随酞菁化合物浓度增加而增加;表面形貌分析也证明了酞菁化合物的加入提高了碳钢的表面完整性,抑制其腐蚀;量子化学计算结果显示,随着分子的最低空轨道(LUMO)的能量升高,酞菁化合物的缓蚀能力降低.

关键词: 酞菁化合物 , 缓蚀剂 , 电化学实验 , SEM , 量子化学