摘要
用机械合金化法制备出MgNi及MgNi-TiNi0.56M0.44(M=Al、Fe)复合合金,并研究该系列合金的相结构和电化学性能.XRD结果表明所合成的几种合金均为非晶态;充放电结果表明:MgNi-TiNi0.56M0.44(M=Al、Fe)复合合金的初始容量比纯MgNi合金低,但循环寿命有较大的改善,其中MgNi-TiNi0.56Al0.44合金放电容量最大,达380.64mAh/g,经50次循环后容量保持率是48.97%;动电位扫描结果表明复合后合金电极的抗腐蚀能力增强;循环伏安法和电化学阻抗谱法研究结果表明:复合后降低了电极表面的电子转移电阻和H原子的扩散阻抗,增强了电极表面的电化学催化性能.
MgNi and MgNi-TiNi0.56 M0.44 （M = Al, Fe）alloys were successfully synthesized by mechanical alloying （MA） approach. The structure and the electrochemical characteristics of these Mg-based electrodes were studied. The results of X-ray diffraction and scanning electron microscope show that the alloys have amorphous structures. The charge-discharge cycle tests indicate that the cycle performance of these alloys are better than those of MgNi alloys, although the first discharge capacities are lower than that of the MgNi alloys. Among these alloys, the discharge capacity of MgNi-TiNi0 .56Al0 .44 is the highest, up to 380.64mAh/g, and the capacity maintaining rate is 48.97 % after 50 cycles. Potentiodynamic polarization curves prove that anti-corrosion performance of the electrodes become better. Cyclic voltammetry （CV） and electrochemical impedance spectroscope （EIS） tests show that the introduction of the TiNi0. 56 M0.44 （M = Al, Fe）alloys decrease the charge-transfer reaction resistance and the H atom diffusion impedance, and improve the electrode catalytic activity significantly.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
2009年第2期361-366,共6页
Journal of Inorganic Materials
关键词
镁基贮氢合金
电化学性能
机械合金化
Mg-based hydrogen storage alloy
electrochemical properties
mechanical alloying
