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国家自然科学基金(50961009)

作品数:25 被引量:63H指数:5
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25 条 记 录,以下是 1-10
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Influences of melt spinning on electrochemical hydrogen storage performance of nanocrystalline and amorphous Mg_2Ni-type alloys被引量:4
2011年
In order to improve the electrochemical hydrogen storage performance of the Mg2Ni-type electrode alloys, Mg in the alloy was partially substituted by La, and the nanocrystalline and amorphous Mg2Ni-type Mg20-xLaxNi10 (x-=0, 2) alloys were synthesized by melt-spinning technique. The microstructures of the as-spun alloys were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The electrochemical hydrogen storage properties of the experimental alloys were tested. The results show that no amorphous phase is detected in the as-spun Mg20Ni10 alloy, but the as-spun Mg18La2Ni10 alloy holds a major amorphous phase. As La content increases from 0 to 2, the maximum discharge capacity of the as-spun (20 m/s) alloys rises from 96.5 to 387.1 mA.h/g, and the capacity retaining rate (S20) at the 20th cycle grows from 31.3% to 71.7%. Melt-spinning engenders an impactful effect on the electrochemical hydrogen storage performances of the alloys. With the increase in the spinning rate from 0 to 30 m/s, the maximum discharge capacity increases from 30.3 to 135.5 mA.h/g for the Mg20Ni10 alloy, and from 197.2 to 406.5 mA-h/g for the Mg18La2Ni10 alloy. The capacity retaining rate (S20) of the Mg2oNi10 alloy at the 20th cycle slightly falls from 36.7% to 27.1%, but it markedly mounts up from 37.3% to 78.3% for the Mg18La2Ni10 alloy.
张羊换李保卫任慧平侯忠辉胡峰王新林
关键词:MELT-SPINNINGSTRUCTURE
退火温度对La0.8Mg0.2Ni3.3Co0.2Six(x=0、0.1)合金电化学贮氢性能的影响被引量:1
2013年
采用真空感应熔炼制备了La0.8Mg0.2Ni3.3Co0.2Si x(x=0、0.1)电极合金,并将铸态合金进行真空退火处理,退火温度为900、950、1000和1050℃,保温时间为8h。用XRD分析了铸态及退火态合金的相结构,测试了铸态及退火态合金的电化学贮氢性能。结果表明,铸态及退火态合金均具有多相结构,包括两个主相(La,Mg)2Ni7和LaNi5以及一个残余相LaNi3。退火处理未改变合金的相组成,但使两个主相的含量发生明显改变。合金主相的晶格常数及晶胞体积随退火温度的增加而增加。铸态及退火态合金均具有良好的活化性能,第1次循环即可达到最大放电容量。退火处理明显改善了合金的电化学循环稳定性,合金的放电容量随退火温度的升高先增加后减小。合金的高倍率放电性能(HRD)、电化学交流阻抗谱(EIS)以及氢扩散系数(D)的测试表明,合金的电化学动力学随退火温度的升高先上升后降低。
杨泰杨泰张羊换陈莉翠王海涛任慧平
关键词:退火微观结构电化学性能
Enhanced hydrogen storage kinetics of nanocrystalline and amorphous Mg_2N-type alloy by substituting Ni with Co被引量:7
2011年
In order to improve the hydrogen storage kinetics of the Mg2Ni-type alloys, Ni in the alloy was partially substituted with element Co. The Mg2Ni-type Mg2Ni1-xCox (x=0, 0.1, 0.2, 0.3, 0.4) alloys were fabricated by melt-spinning technique. The structures of the as-spun alloys were characterized by XRD and TEM. The gaseous and electrochemical hydrogen storage kinetics of the alloys was measured. The results show that the substitution of Co for Ni notably enhances the glass forming ability of the Mg2Ni-type alloy. The amorphization degree of the alloys visibly increases with rising of Co content. Furthermore, the substitution of Co for Ni significantly improves the hydrogen storage kinetics of the alloys. With an increase in the amount of Co substitution from 0 to 0.4, the hydrogen absorption saturation ratio of the as-spun (15 m/s) alloy increases from 81.2% to 84.9%, the hydrogen desorption ratio from 17.60% to 64.79%, the hydrogen diffusion coefficient increases from 1.07×10-11 to 2.79×10-11 cm2/s and the limiting current density increases from 46.7 to 191.7 mA/g, respectively.
张羊换宋春红任慧平李志刚胡锋赵栋梁
快淬对RE-Mg-Ni系A_2B_7型贮氢合金动力学性能的影响(英文)
2013年
合金的电化学贮氢动力学性能是其应用于动力电池的重要因素。为了提高RE-Mg-Ni系A2B7型贮氢合金的动力学性能,用M(M=Pr,Zr)部分替代La,并采用快淬处理制备了La0.65M0.1Mg0.25Ni3.2Co0.2Al0.1(M=Pr,Zr)电极合金。研究了元素替代和快淬处理对合金结构及电化学贮氢动力学性能的影响。XRD及TEM结果显示,铸态及快淬态合金均为多相结构,包含(La,Mg)2Ni7和LaNi5主相以及少量的残余相LaNi2。Pr替代快淬态合金为纳米晶结构,而Zr替代快淬态合金为类非晶结构,说明Zr部分替代La促进了非晶的形成。电化学测试表明合金的高倍率放电性能(HRD)随着快淬速度的增加先增大后减小。此外,电化学阻抗谱(EIS),塔菲尔极化曲线以及电势阶跃测试均表明合金的电化学动力学性能随着快淬速度的增加先增大后减小。
张羊换张羊换杨泰侯忠辉杨泰赵栋梁
关键词:电化学动力学
Electrochemical performances of as-cast and annealed La_(0.8-x)Nd_xMg_(0.2)Ni_(3.35)Al_(0.1)Si_0.05(x=0-0.4) alloys applied to Ni/metal hydride (MH) battery被引量:8
2013年
The La-Mg-Ni-based A2B7-type Lao.8_xNdx Mgo.2Ni3.35Alo.lSio.o5 (x = 0, 0.1, 0.2, 0.3, and 0.4) electrode alloys were prepared by casting and annealing. The influence of the partial substitution of Nd for La on the structure and electrochemical performances of the alloys was investigated. The structural analysis of X-ray diffraction and scanning electron microscopy reveals that the experimental alloys consist of two major phases: (La,Mg)2Ni7 with the hexagonal Ce2Ni7-type structure and LaNi5 with the hexagonal CaCus-type structure as well as some residual phases of LaNi3 and NdNis. The electrochemical measurements indicate that an evident change of the electrochemical performance of the alloys is associated with the substitution of Nd for La. The discharge capacity of the alloy first increases then decreases with the growing Nd content, whereas their cycle stability clearly grows all the time. Furthermore, the measurements of the high rate discharge ability, the limiting current density, and hydrogen diffusion coefficient all demonstrate that the electrochemical kinetic properties of the alloy electrodes first augment then decline with the rising amount of Nd substitution.
Yang-Huan ZhangHui-Ping RenTai YangChen ZhaoLi-Cui ChenHong-Wei ShangDong-Liang Zhao
快淬纳米晶和非晶Mg_(20)Ni_(10-x)Co_x(x=0~4)合金的贮氢性能(英文)被引量:1
2012年
为了改善Mg2Ni型合金的贮氢性能,采用Co部分替代合金中的Ni以及快淬工艺制备了纳米晶和非晶态Mg20Ni10-xCox(x=0,1,2,3,4)贮氢合金。用XRD、SEM、HRTEM分析了铸态及快淬态合金的微观结构,并测试了合金的气态吸/放氢动力学及电化学贮氢性能。结果表明,在快淬无Co合金中没有形成非晶相,但快淬含Co合金中形成一定量的非晶相。Co替代Ni及快淬处理显著地改善了合金的气态吸放氢性能。同时,Co替代Ni也显著地提高了快淬态合金的放电容量和电化学循环稳定性。
张羊换郭世海祁焱杨泰陈莉翠许永燕赵栋梁
关键词:快淬贮氢性能
Structures and electrochemical hydrogen storage performance of Si added A_2B_7-type alloy electrodes被引量:6
2014年
In order to ameliorate the electrochemical hydrogen storage performance of La-Mg-Ni system A2B7-type electrode alloys, a small amount of Si was added. The La0.8Mg0.2Ni3.3Co0.2Six (x=0-0.2) electrode alloys were prepared by casting and annealing. The effects of adding Si on the structure and electrochemical hydrogen storage characteristics of the alloys were investigated systematically. The results indicate that the as-cast and annealed alloys hold multiple structures, involving two major phases of (La, Mg)2Ni7 with a Ce2Ni7-type hexagonal structure and LaNi5 with a CaCu5-type hexagonal structure as well as one residual phase LaNi3. The addition of Si results in a decrease in (La, Mg)2Ni7 phase and an increase in LaNi5 phase without changing the phase structure of the alloys. What is more, it brings on an obvious effect on electrochemical hydrogen storage characteristics of the alloys. The discharge capacities of the as-cast and annealed alloys decline with the increase of Si content, but their cycle stabilities clearly grow under the same condition. Furthermore, the measurements of the high rate discharge ability, the limiting current density, hydrogen diffusion coefficient as well as electrochemical impedance spectra all indicate that the electrochemical kinetic properties of the electrode alloys first increase and then decrease with the rising of Si content.
张羊换任慧平蔡颖杨泰张国芳赵栋梁
关键词:STRUCTURE
Gaseous and Electrochemical Hydrogen Storage Kinetics of As-quenched Nanocrystalline and Amorphous Mg_2Ni-type Alloys被引量:4
2013年
The nanocrystalline and amorphous Mg2Ni-type Mg2Ni1-xCox (x = 0, 0.1, 0.2, 0.3, 0.4) alloys were synthesized by melt quenching technology. The structures of the as-cast and quenched alloys were characterized by XRD, SEM and HRTEM. The gaseous hydrogen storage kinetics of the alloys was measured using an automatically controlled Sieverts apparatus. The alloy electrodes were charged and discharged with a constant current density in order to investigate the electrochemical hydrogen storage kinetics of the alloys. The results demonstrate that the substitution of Co for Ni results in the formation of secondary phases MgCo2 and Mg instead of altering the major phase Mg2Ni. No amorphous phase is detected in the as-quenched Co- ffee alloy, however, a certain amount of amorphous phase is clearly found in the as-quenched alloys substituted by Co. Furthermore, both the rapid quenching and the Co substitution significantly improve the gaseous and electrochemical hydrogen storage kinetics of the alloys, for which the notable increase of the hydrogen diffusion coefficient (D) along with the limiting current density (IL) and the obvious decline of the electrochemical impedance generated by both the Co substitution and the rapid quenching are basically responsible.
张羊换YANG TaiSHANG HongweiZHANG GuofangCAI YingZHAO Dongliang
Si元素的添加对La-Mg-Ni系合金贮氢性能的影响被引量:2
2011年
为了提高La-Mg-Ni系A2B7型贮氢合金的电化学循环稳定性,添加少量Si,用铸造工艺制备了La0.75Mg0.25Ni3.3Co0.2Six(x=0,0.05,0.1,0.15,0.2)贮氢合金,分析并测试了其微观结构、电化学性能以及氢扩散系数。结果表明,合金具有多相结构,主相由CaCu5型相和Ce2Ni7型相组成。随着Si元素含量的增加,合金中的CaCu5型相逐渐增加,Ce2Ni7型相则相应减少。Si元素的添加提高了合金的循环稳定性,但使合金的最大放电容量下降,同时也不利于放电电压特性和氢在合金体内的扩散,这与Si添加使合金中各相的相对含量发生改变和合金表面的钝化现象有关。
雍辉张羊换赵栋梁李志刚胡锋王新林
关键词:贮氢合金微观结构电压特性
球磨La_2Mg_(17)+x%Ni(x=50,100,150,200)复合贮氢合金的电化学性能研究被引量:3
2011年
研究了球磨制备的La2Mg17+x%Ni(x=50,100,150,200)复合贮氢合金的电化学性能。XRD分析表明:随着Ni含量的增加,复合合金的晶体结构逐渐转变为非晶结构。电化学测试显示:球磨制备的La2Mg17+x%Ni复合贮氢合金在首次循环后即可达最大放电比容量,合金具有较好的活化性能;复合合金的放电比容量也随Ni粉加入量的增加而增大。在经过60 h球磨后制得的非晶态的La2Mg17+200%Ni复合贮氢合金,其303 K下放电比容量为353.1 mAh.g-1。电化学放电比容量的提高应归因于非晶结构的形成以及Ni粉对表面状态的改变。
王平张胤李霞张羊换
关键词:球磨贮氢合金非晶态
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